From 75abee206d1a575aa98a486d043c94d64df432c1 Mon Sep 17 00:00:00 2001 From: Damien George Date: Sun, 26 Jan 2014 17:41:01 +0000 Subject: stm: USB host mode working! Restructure stm library directories. --- stm/stmperiph/stm32f4xx_spi.c | 1312 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1312 insertions(+) create mode 100644 stm/stmperiph/stm32f4xx_spi.c (limited to 'stm/stmperiph/stm32f4xx_spi.c') diff --git a/stm/stmperiph/stm32f4xx_spi.c b/stm/stmperiph/stm32f4xx_spi.c new file mode 100644 index 0000000000..eb725f46ee --- /dev/null +++ b/stm/stmperiph/stm32f4xx_spi.c @@ -0,0 +1,1312 @@ +/** + ****************************************************************************** + * @file stm32f4xx_spi.c + * @author MCD Application Team + * @version V1.3.0 + * @date 08-November-2013 + * @brief This file provides firmware functions to manage the following + * functionalities of the Serial peripheral interface (SPI): + * + Initialization and Configuration + * + Data transfers functions + * + Hardware CRC Calculation + * + DMA transfers management + * + Interrupts and flags management + * +@verbatim + + =================================================================== + ##### How to use this driver ##### + =================================================================== + [..] + (#) Enable peripheral clock using the following functions + RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE) for SPI1 + RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE) for SPI2 + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE) for SPI3 + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE) for SPI4 + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE) for SPI5 + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE) for SPI6. + + (#) Enable SCK, MOSI, MISO and NSS GPIO clocks using RCC_AHB1PeriphClockCmd() + function. In I2S mode, if an external clock source is used then the I2S + CKIN pin GPIO clock should also be enabled. + + (#) Peripherals alternate function: + (++) Connect the pin to the desired peripherals' Alternate Function (AF) + using GPIO_PinAFConfig() function + (++) Configure the desired pin in alternate function by: + GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF + (++) Select the type, pull-up/pull-down and output speed via GPIO_PuPd, + GPIO_OType and GPIO_Speed members + (++) Call GPIO_Init() function In I2S mode, if an external clock source is + used then the I2S CKIN pin should be also configured in Alternate + function Push-pull pull-up mode. + + (#) Program the Polarity, Phase, First Data, Baud Rate Prescaler, Slave + Management, Peripheral Mode and CRC Polynomial values using the SPI_Init() + function. + In I2S mode, program the Mode, Standard, Data Format, MCLK Output, Audio + frequency and Polarity using I2S_Init() function. For I2S mode, make sure + that either: + (++) I2S PLL is configured using the functions + RCC_I2SCLKConfig(RCC_I2S2CLKSource_PLLI2S), RCC_PLLI2SCmd(ENABLE) and + RCC_GetFlagStatus(RCC_FLAG_PLLI2SRDY); or + (++) External clock source is configured using the function + RCC_I2SCLKConfig(RCC_I2S2CLKSource_Ext) and after setting correctly + the define constant I2S_EXTERNAL_CLOCK_VAL in the stm32f4xx_conf.h file. + + (#) Enable the NVIC and the corresponding interrupt using the function + SPI_ITConfig() if you need to use interrupt mode. + + (#) When using the DMA mode + (++) Configure the DMA using DMA_Init() function + (++) Active the needed channel Request using SPI_I2S_DMACmd() function + + (#) Enable the SPI using the SPI_Cmd() function or enable the I2S using + I2S_Cmd(). + + (#) Enable the DMA using the DMA_Cmd() function when using DMA mode. + + (#) Optionally, you can enable/configure the following parameters without + re-initialization (i.e there is no need to call again SPI_Init() function): + (++) When bidirectional mode (SPI_Direction_1Line_Rx or SPI_Direction_1Line_Tx) + is programmed as Data direction parameter using the SPI_Init() function + it can be possible to switch between SPI_Direction_Tx or SPI_Direction_Rx + using the SPI_BiDirectionalLineConfig() function. + (++) When SPI_NSS_Soft is selected as Slave Select Management parameter + using the SPI_Init() function it can be possible to manage the + NSS internal signal using the SPI_NSSInternalSoftwareConfig() function. + (++) Reconfigure the data size using the SPI_DataSizeConfig() function + (++) Enable or disable the SS output using the SPI_SSOutputCmd() function + + (#) To use the CRC Hardware calculation feature refer to the Peripheral + CRC hardware Calculation subsection. + + + [..] It is possible to use SPI in I2S full duplex mode, in this case, each SPI + peripheral is able to manage sending and receiving data simultaneously + using two data lines. Each SPI peripheral has an extended block called I2Sxext + (ie. I2S2ext for SPI2 and I2S3ext for SPI3). + The extension block is not a full SPI IP, it is used only as I2S slave to + implement full duplex mode. The extension block uses the same clock sources + as its master. + To configure I2S full duplex you have to: + + (#) Configure SPIx in I2S mode (I2S_Init() function) as described above. + + (#) Call the I2S_FullDuplexConfig() function using the same strucutre passed to + I2S_Init() function. + + (#) Call I2S_Cmd() for SPIx then for its extended block. + + (#) To configure interrupts or DMA requests and to get/clear flag status, + use I2Sxext instance for the extension block. + + [..] Functions that can be called with I2Sxext instances are: I2S_Cmd(), + I2S_FullDuplexConfig(), SPI_I2S_ReceiveData(), SPI_I2S_SendData(), + SPI_I2S_DMACmd(), SPI_I2S_ITConfig(), SPI_I2S_GetFlagStatus(), + SPI_I2S_ClearFlag(), SPI_I2S_GetITStatus() and SPI_I2S_ClearITPendingBit(). + + Example: To use SPI3 in Full duplex mode (SPI3 is Master Tx, I2S3ext is Slave Rx): + + RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); + I2S_StructInit(&I2SInitStruct); + I2SInitStruct.Mode = I2S_Mode_MasterTx; + I2S_Init(SPI3, &I2SInitStruct); + I2S_FullDuplexConfig(SPI3ext, &I2SInitStruct) + I2S_Cmd(SPI3, ENABLE); + I2S_Cmd(SPI3ext, ENABLE); + ... + while (SPI_I2S_GetFlagStatus(SPI2, SPI_FLAG_TXE) == RESET) + {} + SPI_I2S_SendData(SPI3, txdata[i]); + ... + while (SPI_I2S_GetFlagStatus(I2S3ext, SPI_FLAG_RXNE) == RESET) + {} + rxdata[i] = SPI_I2S_ReceiveData(I2S3ext); + ... + + [..] + (@) In I2S mode: if an external clock is used as source clock for the I2S, + then the define I2S_EXTERNAL_CLOCK_VAL in file stm32f4xx_conf.h should + be enabled and set to the value of the source clock frequency (in Hz). + + (@) In SPI mode: To use the SPI TI mode, call the function SPI_TIModeCmd() + just after calling the function SPI_Init(). + +@endverbatim + * + ****************************************************************************** + * @attention + * + *

© COPYRIGHT 2013 STMicroelectronics

+ * + * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); + * You may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.st.com/software_license_agreement_liberty_v2 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + ****************************************************************************** + */ + +/* Includes ------------------------------------------------------------------*/ +#include "stm32f4xx_spi.h" +#include "stm32f4xx_rcc.h" + +/** @addtogroup STM32F4xx_StdPeriph_Driver + * @{ + */ + +/** @defgroup SPI + * @brief SPI driver modules + * @{ + */ + +/* Private typedef -----------------------------------------------------------*/ +/* Private define ------------------------------------------------------------*/ + +/* SPI registers Masks */ +#define CR1_CLEAR_MASK ((uint16_t)0x3040) +#define I2SCFGR_CLEAR_MASK ((uint16_t)0xF040) + +/* RCC PLLs masks */ +#define PLLCFGR_PPLR_MASK ((uint32_t)0x70000000) +#define PLLCFGR_PPLN_MASK ((uint32_t)0x00007FC0) + +#define SPI_CR2_FRF ((uint16_t)0x0010) +#define SPI_SR_TIFRFE ((uint16_t)0x0100) + +/* Private macro -------------------------------------------------------------*/ +/* Private variables ---------------------------------------------------------*/ +/* Private function prototypes -----------------------------------------------*/ +/* Private functions ---------------------------------------------------------*/ + +/** @defgroup SPI_Private_Functions + * @{ + */ + +/** @defgroup SPI_Group1 Initialization and Configuration functions + * @brief Initialization and Configuration functions + * +@verbatim + =============================================================================== + ##### Initialization and Configuration functions ##### + =============================================================================== + [..] This section provides a set of functions allowing to initialize the SPI + Direction, SPI Mode, SPI Data Size, SPI Polarity, SPI Phase, SPI NSS + Management, SPI Baud Rate Prescaler, SPI First Bit and SPI CRC Polynomial. + + [..] The SPI_Init() function follows the SPI configuration procedures for Master + mode and Slave mode (details for these procedures are available in reference + manual (RM0090)). + +@endverbatim + * @{ + */ + +/** + * @brief De-initialize the SPIx peripheral registers to their default reset values. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode. + * + * @note The extended I2S blocks (ie. I2S2ext and I2S3ext blocks) are de-initialized + * when the relative I2S peripheral is de-initialized (the extended block's clock + * is managed by the I2S peripheral clock). + * + * @retval None + */ +void SPI_I2S_DeInit(SPI_TypeDef* SPIx) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + + if (SPIx == SPI1) + { + /* Enable SPI1 reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE); + /* Release SPI1 from reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE); + } + else if (SPIx == SPI2) + { + /* Enable SPI2 reset state */ + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE); + /* Release SPI2 from reset state */ + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE); + } + else if (SPIx == SPI3) + { + /* Enable SPI3 reset state */ + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE); + /* Release SPI3 from reset state */ + RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, DISABLE); + } + else if (SPIx == SPI4) + { + /* Enable SPI4 reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI4, ENABLE); + /* Release SPI4 from reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI4, DISABLE); + } + else if (SPIx == SPI5) + { + /* Enable SPI5 reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI5, ENABLE); + /* Release SPI5 from reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI5, DISABLE); + } + else + { + if (SPIx == SPI6) + { + /* Enable SPI6 reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI6, ENABLE); + /* Release SPI6 from reset state */ + RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI6, DISABLE); + } + } +} + +/** + * @brief Initializes the SPIx peripheral according to the specified + * parameters in the SPI_InitStruct. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param SPI_InitStruct: pointer to a SPI_InitTypeDef structure that + * contains the configuration information for the specified SPI peripheral. + * @retval None + */ +void SPI_Init(SPI_TypeDef* SPIx, SPI_InitTypeDef* SPI_InitStruct) +{ + uint16_t tmpreg = 0; + + /* check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + + /* Check the SPI parameters */ + assert_param(IS_SPI_DIRECTION_MODE(SPI_InitStruct->SPI_Direction)); + assert_param(IS_SPI_MODE(SPI_InitStruct->SPI_Mode)); + assert_param(IS_SPI_DATASIZE(SPI_InitStruct->SPI_DataSize)); + assert_param(IS_SPI_CPOL(SPI_InitStruct->SPI_CPOL)); + assert_param(IS_SPI_CPHA(SPI_InitStruct->SPI_CPHA)); + assert_param(IS_SPI_NSS(SPI_InitStruct->SPI_NSS)); + assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_InitStruct->SPI_BaudRatePrescaler)); + assert_param(IS_SPI_FIRST_BIT(SPI_InitStruct->SPI_FirstBit)); + assert_param(IS_SPI_CRC_POLYNOMIAL(SPI_InitStruct->SPI_CRCPolynomial)); + +/*---------------------------- SPIx CR1 Configuration ------------------------*/ + /* Get the SPIx CR1 value */ + tmpreg = SPIx->CR1; + /* Clear BIDIMode, BIDIOE, RxONLY, SSM, SSI, LSBFirst, BR, MSTR, CPOL and CPHA bits */ + tmpreg &= CR1_CLEAR_MASK; + /* Configure SPIx: direction, NSS management, first transmitted bit, BaudRate prescaler + master/salve mode, CPOL and CPHA */ + /* Set BIDImode, BIDIOE and RxONLY bits according to SPI_Direction value */ + /* Set SSM, SSI and MSTR bits according to SPI_Mode and SPI_NSS values */ + /* Set LSBFirst bit according to SPI_FirstBit value */ + /* Set BR bits according to SPI_BaudRatePrescaler value */ + /* Set CPOL bit according to SPI_CPOL value */ + /* Set CPHA bit according to SPI_CPHA value */ + tmpreg |= (uint16_t)((uint32_t)SPI_InitStruct->SPI_Direction | SPI_InitStruct->SPI_Mode | + SPI_InitStruct->SPI_DataSize | SPI_InitStruct->SPI_CPOL | + SPI_InitStruct->SPI_CPHA | SPI_InitStruct->SPI_NSS | + SPI_InitStruct->SPI_BaudRatePrescaler | SPI_InitStruct->SPI_FirstBit); + /* Write to SPIx CR1 */ + SPIx->CR1 = tmpreg; + + /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */ + SPIx->I2SCFGR &= (uint16_t)~((uint16_t)SPI_I2SCFGR_I2SMOD); +/*---------------------------- SPIx CRCPOLY Configuration --------------------*/ + /* Write to SPIx CRCPOLY */ + SPIx->CRCPR = SPI_InitStruct->SPI_CRCPolynomial; +} + +/** + * @brief Initializes the SPIx peripheral according to the specified + * parameters in the I2S_InitStruct. + * @param SPIx: where x can be 2 or 3 to select the SPI peripheral (configured in I2S mode). + * @param I2S_InitStruct: pointer to an I2S_InitTypeDef structure that + * contains the configuration information for the specified SPI peripheral + * configured in I2S mode. + * + * @note The function calculates the optimal prescaler needed to obtain the most + * accurate audio frequency (depending on the I2S clock source, the PLL values + * and the product configuration). But in case the prescaler value is greater + * than 511, the default value (0x02) will be configured instead. + * + * @note if an external clock is used as source clock for the I2S, then the define + * I2S_EXTERNAL_CLOCK_VAL in file stm32f4xx_conf.h should be enabled and set + * to the value of the the source clock frequency (in Hz). + * + * @retval None + */ +void I2S_Init(SPI_TypeDef* SPIx, I2S_InitTypeDef* I2S_InitStruct) +{ + uint16_t tmpreg = 0, i2sdiv = 2, i2sodd = 0, packetlength = 1; + uint32_t tmp = 0, i2sclk = 0; +#ifndef I2S_EXTERNAL_CLOCK_VAL + uint32_t pllm = 0, plln = 0, pllr = 0; +#endif /* I2S_EXTERNAL_CLOCK_VAL */ + + /* Check the I2S parameters */ + assert_param(IS_SPI_23_PERIPH(SPIx)); + assert_param(IS_I2S_MODE(I2S_InitStruct->I2S_Mode)); + assert_param(IS_I2S_STANDARD(I2S_InitStruct->I2S_Standard)); + assert_param(IS_I2S_DATA_FORMAT(I2S_InitStruct->I2S_DataFormat)); + assert_param(IS_I2S_MCLK_OUTPUT(I2S_InitStruct->I2S_MCLKOutput)); + assert_param(IS_I2S_AUDIO_FREQ(I2S_InitStruct->I2S_AudioFreq)); + assert_param(IS_I2S_CPOL(I2S_InitStruct->I2S_CPOL)); + +/*----------------------- SPIx I2SCFGR & I2SPR Configuration -----------------*/ + /* Clear I2SMOD, I2SE, I2SCFG, PCMSYNC, I2SSTD, CKPOL, DATLEN and CHLEN bits */ + SPIx->I2SCFGR &= I2SCFGR_CLEAR_MASK; + SPIx->I2SPR = 0x0002; + + /* Get the I2SCFGR register value */ + tmpreg = SPIx->I2SCFGR; + + /* If the default value has to be written, reinitialize i2sdiv and i2sodd*/ + if(I2S_InitStruct->I2S_AudioFreq == I2S_AudioFreq_Default) + { + i2sodd = (uint16_t)0; + i2sdiv = (uint16_t)2; + } + /* If the requested audio frequency is not the default, compute the prescaler */ + else + { + /* Check the frame length (For the Prescaler computing) *******************/ + if(I2S_InitStruct->I2S_DataFormat == I2S_DataFormat_16b) + { + /* Packet length is 16 bits */ + packetlength = 1; + } + else + { + /* Packet length is 32 bits */ + packetlength = 2; + } + + /* Get I2S source Clock frequency ****************************************/ + + /* If an external I2S clock has to be used, this define should be set + in the project configuration or in the stm32f4xx_conf.h file */ + #ifdef I2S_EXTERNAL_CLOCK_VAL + /* Set external clock as I2S clock source */ + if ((RCC->CFGR & RCC_CFGR_I2SSRC) == 0) + { + RCC->CFGR |= (uint32_t)RCC_CFGR_I2SSRC; + } + + /* Set the I2S clock to the external clock value */ + i2sclk = I2S_EXTERNAL_CLOCK_VAL; + + #else /* There is no define for External I2S clock source */ + /* Set PLLI2S as I2S clock source */ + if ((RCC->CFGR & RCC_CFGR_I2SSRC) != 0) + { + RCC->CFGR &= ~(uint32_t)RCC_CFGR_I2SSRC; + } + + /* Get the PLLI2SN value */ + plln = (uint32_t)(((RCC->PLLI2SCFGR & RCC_PLLI2SCFGR_PLLI2SN) >> 6) & \ + (RCC_PLLI2SCFGR_PLLI2SN >> 6)); + + /* Get the PLLI2SR value */ + pllr = (uint32_t)(((RCC->PLLI2SCFGR & RCC_PLLI2SCFGR_PLLI2SR) >> 28) & \ + (RCC_PLLI2SCFGR_PLLI2SR >> 28)); + + /* Get the PLLM value */ + pllm = (uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLM); + + /* Get the I2S source clock value */ + i2sclk = (uint32_t)(((HSE_VALUE / pllm) * plln) / pllr); + #endif /* I2S_EXTERNAL_CLOCK_VAL */ + + /* Compute the Real divider depending on the MCLK output state, with a floating point */ + if(I2S_InitStruct->I2S_MCLKOutput == I2S_MCLKOutput_Enable) + { + /* MCLK output is enabled */ + tmp = (uint16_t)(((((i2sclk / 256) * 10) / I2S_InitStruct->I2S_AudioFreq)) + 5); + } + else + { + /* MCLK output is disabled */ + tmp = (uint16_t)(((((i2sclk / (32 * packetlength)) *10 ) / I2S_InitStruct->I2S_AudioFreq)) + 5); + } + + /* Remove the flatting point */ + tmp = tmp / 10; + + /* Check the parity of the divider */ + i2sodd = (uint16_t)(tmp & (uint16_t)0x0001); + + /* Compute the i2sdiv prescaler */ + i2sdiv = (uint16_t)((tmp - i2sodd) / 2); + + /* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */ + i2sodd = (uint16_t) (i2sodd << 8); + } + + /* Test if the divider is 1 or 0 or greater than 0xFF */ + if ((i2sdiv < 2) || (i2sdiv > 0xFF)) + { + /* Set the default values */ + i2sdiv = 2; + i2sodd = 0; + } + + /* Write to SPIx I2SPR register the computed value */ + SPIx->I2SPR = (uint16_t)((uint16_t)i2sdiv | (uint16_t)(i2sodd | (uint16_t)I2S_InitStruct->I2S_MCLKOutput)); + + /* Configure the I2S with the SPI_InitStruct values */ + tmpreg |= (uint16_t)((uint16_t)SPI_I2SCFGR_I2SMOD | (uint16_t)(I2S_InitStruct->I2S_Mode | \ + (uint16_t)(I2S_InitStruct->I2S_Standard | (uint16_t)(I2S_InitStruct->I2S_DataFormat | \ + (uint16_t)I2S_InitStruct->I2S_CPOL)))); + + /* Write to SPIx I2SCFGR */ + SPIx->I2SCFGR = tmpreg; +} + +/** + * @brief Fills each SPI_InitStruct member with its default value. + * @param SPI_InitStruct: pointer to a SPI_InitTypeDef structure which will be initialized. + * @retval None + */ +void SPI_StructInit(SPI_InitTypeDef* SPI_InitStruct) +{ +/*--------------- Reset SPI init structure parameters values -----------------*/ + /* Initialize the SPI_Direction member */ + SPI_InitStruct->SPI_Direction = SPI_Direction_2Lines_FullDuplex; + /* initialize the SPI_Mode member */ + SPI_InitStruct->SPI_Mode = SPI_Mode_Slave; + /* initialize the SPI_DataSize member */ + SPI_InitStruct->SPI_DataSize = SPI_DataSize_8b; + /* Initialize the SPI_CPOL member */ + SPI_InitStruct->SPI_CPOL = SPI_CPOL_Low; + /* Initialize the SPI_CPHA member */ + SPI_InitStruct->SPI_CPHA = SPI_CPHA_1Edge; + /* Initialize the SPI_NSS member */ + SPI_InitStruct->SPI_NSS = SPI_NSS_Hard; + /* Initialize the SPI_BaudRatePrescaler member */ + SPI_InitStruct->SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2; + /* Initialize the SPI_FirstBit member */ + SPI_InitStruct->SPI_FirstBit = SPI_FirstBit_MSB; + /* Initialize the SPI_CRCPolynomial member */ + SPI_InitStruct->SPI_CRCPolynomial = 7; +} + +/** + * @brief Fills each I2S_InitStruct member with its default value. + * @param I2S_InitStruct: pointer to a I2S_InitTypeDef structure which will be initialized. + * @retval None + */ +void I2S_StructInit(I2S_InitTypeDef* I2S_InitStruct) +{ +/*--------------- Reset I2S init structure parameters values -----------------*/ + /* Initialize the I2S_Mode member */ + I2S_InitStruct->I2S_Mode = I2S_Mode_SlaveTx; + + /* Initialize the I2S_Standard member */ + I2S_InitStruct->I2S_Standard = I2S_Standard_Phillips; + + /* Initialize the I2S_DataFormat member */ + I2S_InitStruct->I2S_DataFormat = I2S_DataFormat_16b; + + /* Initialize the I2S_MCLKOutput member */ + I2S_InitStruct->I2S_MCLKOutput = I2S_MCLKOutput_Disable; + + /* Initialize the I2S_AudioFreq member */ + I2S_InitStruct->I2S_AudioFreq = I2S_AudioFreq_Default; + + /* Initialize the I2S_CPOL member */ + I2S_InitStruct->I2S_CPOL = I2S_CPOL_Low; +} + +/** + * @brief Enables or disables the specified SPI peripheral. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param NewState: new state of the SPIx peripheral. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void SPI_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + if (NewState != DISABLE) + { + /* Enable the selected SPI peripheral */ + SPIx->CR1 |= SPI_CR1_SPE; + } + else + { + /* Disable the selected SPI peripheral */ + SPIx->CR1 &= (uint16_t)~((uint16_t)SPI_CR1_SPE); + } +} + +/** + * @brief Enables or disables the specified SPI peripheral (in I2S mode). + * @param SPIx: where x can be 2 or 3 to select the SPI peripheral (or I2Sxext + * for full duplex mode). + * @param NewState: new state of the SPIx peripheral. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void I2S_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_SPI_23_PERIPH_EXT(SPIx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the selected SPI peripheral (in I2S mode) */ + SPIx->I2SCFGR |= SPI_I2SCFGR_I2SE; + } + else + { + /* Disable the selected SPI peripheral in I2S mode */ + SPIx->I2SCFGR &= (uint16_t)~((uint16_t)SPI_I2SCFGR_I2SE); + } +} + +/** + * @brief Configures the data size for the selected SPI. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param SPI_DataSize: specifies the SPI data size. + * This parameter can be one of the following values: + * @arg SPI_DataSize_16b: Set data frame format to 16bit + * @arg SPI_DataSize_8b: Set data frame format to 8bit + * @retval None + */ +void SPI_DataSizeConfig(SPI_TypeDef* SPIx, uint16_t SPI_DataSize) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_SPI_DATASIZE(SPI_DataSize)); + /* Clear DFF bit */ + SPIx->CR1 &= (uint16_t)~SPI_DataSize_16b; + /* Set new DFF bit value */ + SPIx->CR1 |= SPI_DataSize; +} + +/** + * @brief Selects the data transfer direction in bidirectional mode for the specified SPI. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param SPI_Direction: specifies the data transfer direction in bidirectional mode. + * This parameter can be one of the following values: + * @arg SPI_Direction_Tx: Selects Tx transmission direction + * @arg SPI_Direction_Rx: Selects Rx receive direction + * @retval None + */ +void SPI_BiDirectionalLineConfig(SPI_TypeDef* SPIx, uint16_t SPI_Direction) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_SPI_DIRECTION(SPI_Direction)); + if (SPI_Direction == SPI_Direction_Tx) + { + /* Set the Tx only mode */ + SPIx->CR1 |= SPI_Direction_Tx; + } + else + { + /* Set the Rx only mode */ + SPIx->CR1 &= SPI_Direction_Rx; + } +} + +/** + * @brief Configures internally by software the NSS pin for the selected SPI. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param SPI_NSSInternalSoft: specifies the SPI NSS internal state. + * This parameter can be one of the following values: + * @arg SPI_NSSInternalSoft_Set: Set NSS pin internally + * @arg SPI_NSSInternalSoft_Reset: Reset NSS pin internally + * @retval None + */ +void SPI_NSSInternalSoftwareConfig(SPI_TypeDef* SPIx, uint16_t SPI_NSSInternalSoft) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_SPI_NSS_INTERNAL(SPI_NSSInternalSoft)); + if (SPI_NSSInternalSoft != SPI_NSSInternalSoft_Reset) + { + /* Set NSS pin internally by software */ + SPIx->CR1 |= SPI_NSSInternalSoft_Set; + } + else + { + /* Reset NSS pin internally by software */ + SPIx->CR1 &= SPI_NSSInternalSoft_Reset; + } +} + +/** + * @brief Enables or disables the SS output for the selected SPI. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param NewState: new state of the SPIx SS output. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void SPI_SSOutputCmd(SPI_TypeDef* SPIx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + if (NewState != DISABLE) + { + /* Enable the selected SPI SS output */ + SPIx->CR2 |= (uint16_t)SPI_CR2_SSOE; + } + else + { + /* Disable the selected SPI SS output */ + SPIx->CR2 &= (uint16_t)~((uint16_t)SPI_CR2_SSOE); + } +} + +/** + * @brief Enables or disables the SPIx/I2Sx DMA interface. + * + * @note This function can be called only after the SPI_Init() function has + * been called. + * @note When TI mode is selected, the control bits SSM, SSI, CPOL and CPHA + * are not taken into consideration and are configured by hardware + * respectively to the TI mode requirements. + * + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 + * @param NewState: new state of the selected SPI TI communication mode. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void SPI_TIModeCmd(SPI_TypeDef* SPIx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the TI mode for the selected SPI peripheral */ + SPIx->CR2 |= SPI_CR2_FRF; + } + else + { + /* Disable the TI mode for the selected SPI peripheral */ + SPIx->CR2 &= (uint16_t)~SPI_CR2_FRF; + } +} + +/** + * @brief Configures the full duplex mode for the I2Sx peripheral using its + * extension I2Sxext according to the specified parameters in the + * I2S_InitStruct. + * @param I2Sxext: where x can be 2 or 3 to select the I2S peripheral extension block. + * @param I2S_InitStruct: pointer to an I2S_InitTypeDef structure that + * contains the configuration information for the specified I2S peripheral + * extension. + * + * @note The structure pointed by I2S_InitStruct parameter should be the same + * used for the master I2S peripheral. In this case, if the master is + * configured as transmitter, the slave will be receiver and vice versa. + * Or you can force a different mode by modifying the field I2S_Mode to the + * value I2S_SlaveRx or I2S_SlaveTx indepedently of the master configuration. + * + * @note The I2S full duplex extension can be configured in slave mode only. + * + * @retval None + */ +void I2S_FullDuplexConfig(SPI_TypeDef* I2Sxext, I2S_InitTypeDef* I2S_InitStruct) +{ + uint16_t tmpreg = 0, tmp = 0; + + /* Check the I2S parameters */ + assert_param(IS_I2S_EXT_PERIPH(I2Sxext)); + assert_param(IS_I2S_MODE(I2S_InitStruct->I2S_Mode)); + assert_param(IS_I2S_STANDARD(I2S_InitStruct->I2S_Standard)); + assert_param(IS_I2S_DATA_FORMAT(I2S_InitStruct->I2S_DataFormat)); + assert_param(IS_I2S_CPOL(I2S_InitStruct->I2S_CPOL)); + +/*----------------------- SPIx I2SCFGR & I2SPR Configuration -----------------*/ + /* Clear I2SMOD, I2SE, I2SCFG, PCMSYNC, I2SSTD, CKPOL, DATLEN and CHLEN bits */ + I2Sxext->I2SCFGR &= I2SCFGR_CLEAR_MASK; + I2Sxext->I2SPR = 0x0002; + + /* Get the I2SCFGR register value */ + tmpreg = I2Sxext->I2SCFGR; + + /* Get the mode to be configured for the extended I2S */ + if ((I2S_InitStruct->I2S_Mode == I2S_Mode_MasterTx) || (I2S_InitStruct->I2S_Mode == I2S_Mode_SlaveTx)) + { + tmp = I2S_Mode_SlaveRx; + } + else + { + if ((I2S_InitStruct->I2S_Mode == I2S_Mode_MasterRx) || (I2S_InitStruct->I2S_Mode == I2S_Mode_SlaveRx)) + { + tmp = I2S_Mode_SlaveTx; + } + } + + + /* Configure the I2S with the SPI_InitStruct values */ + tmpreg |= (uint16_t)((uint16_t)SPI_I2SCFGR_I2SMOD | (uint16_t)(tmp | \ + (uint16_t)(I2S_InitStruct->I2S_Standard | (uint16_t)(I2S_InitStruct->I2S_DataFormat | \ + (uint16_t)I2S_InitStruct->I2S_CPOL)))); + + /* Write to SPIx I2SCFGR */ + I2Sxext->I2SCFGR = tmpreg; +} + +/** + * @} + */ + +/** @defgroup SPI_Group2 Data transfers functions + * @brief Data transfers functions + * +@verbatim + =============================================================================== + ##### Data transfers functions ##### + =============================================================================== + + [..] This section provides a set of functions allowing to manage the SPI data + transfers. In reception, data are received and then stored into an internal + Rx buffer while. In transmission, data are first stored into an internal Tx + buffer before being transmitted. + + [..] The read access of the SPI_DR register can be done using the SPI_I2S_ReceiveData() + function and returns the Rx buffered value. Whereas a write access to the SPI_DR + can be done using SPI_I2S_SendData() function and stores the written data into + Tx buffer. + +@endverbatim + * @{ + */ + +/** + * @brief Returns the most recent received data by the SPIx/I2Sx peripheral. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @retval The value of the received data. + */ +uint16_t SPI_I2S_ReceiveData(SPI_TypeDef* SPIx) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + + /* Return the data in the DR register */ + return SPIx->DR; +} + +/** + * @brief Transmits a Data through the SPIx/I2Sx peripheral. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @param Data: Data to be transmitted. + * @retval None + */ +void SPI_I2S_SendData(SPI_TypeDef* SPIx, uint16_t Data) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + + /* Write in the DR register the data to be sent */ + SPIx->DR = Data; +} + +/** + * @} + */ + +/** @defgroup SPI_Group3 Hardware CRC Calculation functions + * @brief Hardware CRC Calculation functions + * +@verbatim + =============================================================================== + ##### Hardware CRC Calculation functions ##### + =============================================================================== + + [..] This section provides a set of functions allowing to manage the SPI CRC hardware + calculation + + [..] SPI communication using CRC is possible through the following procedure: + (#) Program the Data direction, Polarity, Phase, First Data, Baud Rate Prescaler, + Slave Management, Peripheral Mode and CRC Polynomial values using the SPI_Init() + function. + (#) Enable the CRC calculation using the SPI_CalculateCRC() function. + (#) Enable the SPI using the SPI_Cmd() function + (#) Before writing the last data to the TX buffer, set the CRCNext bit using the + SPI_TransmitCRC() function to indicate that after transmission of the last + data, the CRC should be transmitted. + (#) After transmitting the last data, the SPI transmits the CRC. The SPI_CR1_CRCNEXT + bit is reset. The CRC is also received and compared against the SPI_RXCRCR + value. + If the value does not match, the SPI_FLAG_CRCERR flag is set and an interrupt + can be generated when the SPI_I2S_IT_ERR interrupt is enabled. + + [..] + (@) It is advised not to read the calculated CRC values during the communication. + + (@) When the SPI is in slave mode, be careful to enable CRC calculation only + when the clock is stable, that is, when the clock is in the steady state. + If not, a wrong CRC calculation may be done. In fact, the CRC is sensitive + to the SCK slave input clock as soon as CRCEN is set, and this, whatever + the value of the SPE bit. + + (@) With high bitrate frequencies, be careful when transmitting the CRC. + As the number of used CPU cycles has to be as low as possible in the CRC + transfer phase, it is forbidden to call software functions in the CRC + transmission sequence to avoid errors in the last data and CRC reception. + In fact, CRCNEXT bit has to be written before the end of the transmission/reception + of the last data. + + (@) For high bit rate frequencies, it is advised to use the DMA mode to avoid the + degradation of the SPI speed performance due to CPU accesses impacting the + SPI bandwidth. + + (@) When the STM32F4xx is configured as slave and the NSS hardware mode is + used, the NSS pin needs to be kept low between the data phase and the CRC + phase. + + (@) When the SPI is configured in slave mode with the CRC feature enabled, CRC + calculation takes place even if a high level is applied on the NSS pin. + This may happen for example in case of a multi-slave environment where the + communication master addresses slaves alternately. + + (@) Between a slave de-selection (high level on NSS) and a new slave selection + (low level on NSS), the CRC value should be cleared on both master and slave + sides in order to resynchronize the master and slave for their respective + CRC calculation. + + (@) To clear the CRC, follow the procedure below: + (#@) Disable SPI using the SPI_Cmd() function + (#@) Disable the CRC calculation using the SPI_CalculateCRC() function. + (#@) Enable the CRC calculation using the SPI_CalculateCRC() function. + (#@) Enable SPI using the SPI_Cmd() function. + +@endverbatim + * @{ + */ + +/** + * @brief Enables or disables the CRC value calculation of the transferred bytes. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param NewState: new state of the SPIx CRC value calculation. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void SPI_CalculateCRC(SPI_TypeDef* SPIx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + if (NewState != DISABLE) + { + /* Enable the selected SPI CRC calculation */ + SPIx->CR1 |= SPI_CR1_CRCEN; + } + else + { + /* Disable the selected SPI CRC calculation */ + SPIx->CR1 &= (uint16_t)~((uint16_t)SPI_CR1_CRCEN); + } +} + +/** + * @brief Transmit the SPIx CRC value. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @retval None + */ +void SPI_TransmitCRC(SPI_TypeDef* SPIx) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + + /* Enable the selected SPI CRC transmission */ + SPIx->CR1 |= SPI_CR1_CRCNEXT; +} + +/** + * @brief Returns the transmit or the receive CRC register value for the specified SPI. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @param SPI_CRC: specifies the CRC register to be read. + * This parameter can be one of the following values: + * @arg SPI_CRC_Tx: Selects Tx CRC register + * @arg SPI_CRC_Rx: Selects Rx CRC register + * @retval The selected CRC register value.. + */ +uint16_t SPI_GetCRC(SPI_TypeDef* SPIx, uint8_t SPI_CRC) +{ + uint16_t crcreg = 0; + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + assert_param(IS_SPI_CRC(SPI_CRC)); + if (SPI_CRC != SPI_CRC_Rx) + { + /* Get the Tx CRC register */ + crcreg = SPIx->TXCRCR; + } + else + { + /* Get the Rx CRC register */ + crcreg = SPIx->RXCRCR; + } + /* Return the selected CRC register */ + return crcreg; +} + +/** + * @brief Returns the CRC Polynomial register value for the specified SPI. + * @param SPIx: where x can be 1, 2, 3, 4, 5 or 6 to select the SPI peripheral. + * @retval The CRC Polynomial register value. + */ +uint16_t SPI_GetCRCPolynomial(SPI_TypeDef* SPIx) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH(SPIx)); + + /* Return the CRC polynomial register */ + return SPIx->CRCPR; +} + +/** + * @} + */ + +/** @defgroup SPI_Group4 DMA transfers management functions + * @brief DMA transfers management functions + * +@verbatim + =============================================================================== + ##### DMA transfers management functions ##### + =============================================================================== + +@endverbatim + * @{ + */ + +/** + * @brief Enables or disables the SPIx/I2Sx DMA interface. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @param SPI_I2S_DMAReq: specifies the SPI DMA transfer request to be enabled or disabled. + * This parameter can be any combination of the following values: + * @arg SPI_I2S_DMAReq_Tx: Tx buffer DMA transfer request + * @arg SPI_I2S_DMAReq_Rx: Rx buffer DMA transfer request + * @param NewState: new state of the selected SPI DMA transfer request. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + assert_param(IS_SPI_I2S_DMAREQ(SPI_I2S_DMAReq)); + + if (NewState != DISABLE) + { + /* Enable the selected SPI DMA requests */ + SPIx->CR2 |= SPI_I2S_DMAReq; + } + else + { + /* Disable the selected SPI DMA requests */ + SPIx->CR2 &= (uint16_t)~SPI_I2S_DMAReq; + } +} + +/** + * @} + */ + +/** @defgroup SPI_Group5 Interrupts and flags management functions + * @brief Interrupts and flags management functions + * +@verbatim + =============================================================================== + ##### Interrupts and flags management functions ##### + =============================================================================== + + [..] This section provides a set of functions allowing to configure the SPI Interrupts + sources and check or clear the flags or pending bits status. + The user should identify which mode will be used in his application to manage + the communication: Polling mode, Interrupt mode or DMA mode. + + *** Polling Mode *** + ==================== +[..] In Polling Mode, the SPI/I2S communication can be managed by 9 flags: + (#) SPI_I2S_FLAG_TXE : to indicate the status of the transmit buffer register + (#) SPI_I2S_FLAG_RXNE : to indicate the status of the receive buffer register + (#) SPI_I2S_FLAG_BSY : to indicate the state of the communication layer of the SPI. + (#) SPI_FLAG_CRCERR : to indicate if a CRC Calculation error occur + (#) SPI_FLAG_MODF : to indicate if a Mode Fault error occur + (#) SPI_I2S_FLAG_OVR : to indicate if an Overrun error occur + (#) I2S_FLAG_TIFRFE: to indicate a Frame Format error occurs. + (#) I2S_FLAG_UDR: to indicate an Underrun error occurs. + (#) I2S_FLAG_CHSIDE: to indicate Channel Side. + + (@) Do not use the BSY flag to handle each data transmission or reception. It is + better to use the TXE and RXNE flags instead. + + [..] In this Mode it is advised to use the following functions: + (+) FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG); + (+) void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG); + + *** Interrupt Mode *** + ====================== + [..] In Interrupt Mode, the SPI communication can be managed by 3 interrupt sources + and 7 pending bits: + (+) Pending Bits: + (##) SPI_I2S_IT_TXE : to indicate the status of the transmit buffer register + (##) SPI_I2S_IT_RXNE : to indicate the status of the receive buffer register + (##) SPI_IT_CRCERR : to indicate if a CRC Calculation error occur (available in SPI mode only) + (##) SPI_IT_MODF : to indicate if a Mode Fault error occur (available in SPI mode only) + (##) SPI_I2S_IT_OVR : to indicate if an Overrun error occur + (##) I2S_IT_UDR : to indicate an Underrun Error occurs (available in I2S mode only). + (##) I2S_FLAG_TIFRFE : to indicate a Frame Format error occurs (available in TI mode only). + + (+) Interrupt Source: + (##) SPI_I2S_IT_TXE: specifies the interrupt source for the Tx buffer empty + interrupt. + (##) SPI_I2S_IT_RXNE : specifies the interrupt source for the Rx buffer not + empty interrupt. + (##) SPI_I2S_IT_ERR : specifies the interrupt source for the errors interrupt. + + [..] In this Mode it is advised to use the following functions: + (+) void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState); + (+) ITStatus SPI_I2S_GetITStatus(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT); + (+) void SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT); + + *** DMA Mode *** + ================ + [..] In DMA Mode, the SPI communication can be managed by 2 DMA Channel requests: + (#) SPI_I2S_DMAReq_Tx: specifies the Tx buffer DMA transfer request + (#) SPI_I2S_DMAReq_Rx: specifies the Rx buffer DMA transfer request + + [..] In this Mode it is advised to use the following function: + (+) void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState + NewState); + +@endverbatim + * @{ + */ + +/** + * @brief Enables or disables the specified SPI/I2S interrupts. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @param SPI_I2S_IT: specifies the SPI interrupt source to be enabled or disabled. + * This parameter can be one of the following values: + * @arg SPI_I2S_IT_TXE: Tx buffer empty interrupt mask + * @arg SPI_I2S_IT_RXNE: Rx buffer not empty interrupt mask + * @arg SPI_I2S_IT_ERR: Error interrupt mask + * @param NewState: new state of the specified SPI interrupt. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState) +{ + uint16_t itpos = 0, itmask = 0 ; + + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + assert_param(IS_SPI_I2S_CONFIG_IT(SPI_I2S_IT)); + + /* Get the SPI IT index */ + itpos = SPI_I2S_IT >> 4; + + /* Set the IT mask */ + itmask = (uint16_t)1 << (uint16_t)itpos; + + if (NewState != DISABLE) + { + /* Enable the selected SPI interrupt */ + SPIx->CR2 |= itmask; + } + else + { + /* Disable the selected SPI interrupt */ + SPIx->CR2 &= (uint16_t)~itmask; + } +} + +/** + * @brief Checks whether the specified SPIx/I2Sx flag is set or not. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @param SPI_I2S_FLAG: specifies the SPI flag to check. + * This parameter can be one of the following values: + * @arg SPI_I2S_FLAG_TXE: Transmit buffer empty flag. + * @arg SPI_I2S_FLAG_RXNE: Receive buffer not empty flag. + * @arg SPI_I2S_FLAG_BSY: Busy flag. + * @arg SPI_I2S_FLAG_OVR: Overrun flag. + * @arg SPI_FLAG_MODF: Mode Fault flag. + * @arg SPI_FLAG_CRCERR: CRC Error flag. + * @arg SPI_I2S_FLAG_TIFRFE: Format Error. + * @arg I2S_FLAG_UDR: Underrun Error flag. + * @arg I2S_FLAG_CHSIDE: Channel Side flag. + * @retval The new state of SPI_I2S_FLAG (SET or RESET). + */ +FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG) +{ + FlagStatus bitstatus = RESET; + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + assert_param(IS_SPI_I2S_GET_FLAG(SPI_I2S_FLAG)); + + /* Check the status of the specified SPI flag */ + if ((SPIx->SR & SPI_I2S_FLAG) != (uint16_t)RESET) + { + /* SPI_I2S_FLAG is set */ + bitstatus = SET; + } + else + { + /* SPI_I2S_FLAG is reset */ + bitstatus = RESET; + } + /* Return the SPI_I2S_FLAG status */ + return bitstatus; +} + +/** + * @brief Clears the SPIx CRC Error (CRCERR) flag. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @param SPI_I2S_FLAG: specifies the SPI flag to clear. + * This function clears only CRCERR flag. + * @arg SPI_FLAG_CRCERR: CRC Error flag. + * + * @note OVR (OverRun error) flag is cleared by software sequence: a read + * operation to SPI_DR register (SPI_I2S_ReceiveData()) followed by a read + * operation to SPI_SR register (SPI_I2S_GetFlagStatus()). + * @note UDR (UnderRun error) flag is cleared by a read operation to + * SPI_SR register (SPI_I2S_GetFlagStatus()). + * @note MODF (Mode Fault) flag is cleared by software sequence: a read/write + * operation to SPI_SR register (SPI_I2S_GetFlagStatus()) followed by a + * write operation to SPI_CR1 register (SPI_Cmd() to enable the SPI). + * + * @retval None + */ +void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG) +{ + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + assert_param(IS_SPI_I2S_CLEAR_FLAG(SPI_I2S_FLAG)); + + /* Clear the selected SPI CRC Error (CRCERR) flag */ + SPIx->SR = (uint16_t)~SPI_I2S_FLAG; +} + +/** + * @brief Checks whether the specified SPIx/I2Sx interrupt has occurred or not. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @param SPI_I2S_IT: specifies the SPI interrupt source to check. + * This parameter can be one of the following values: + * @arg SPI_I2S_IT_TXE: Transmit buffer empty interrupt. + * @arg SPI_I2S_IT_RXNE: Receive buffer not empty interrupt. + * @arg SPI_I2S_IT_OVR: Overrun interrupt. + * @arg SPI_IT_MODF: Mode Fault interrupt. + * @arg SPI_IT_CRCERR: CRC Error interrupt. + * @arg I2S_IT_UDR: Underrun interrupt. + * @arg SPI_I2S_IT_TIFRFE: Format Error interrupt. + * @retval The new state of SPI_I2S_IT (SET or RESET). + */ +ITStatus SPI_I2S_GetITStatus(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT) +{ + ITStatus bitstatus = RESET; + uint16_t itpos = 0, itmask = 0, enablestatus = 0; + + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + assert_param(IS_SPI_I2S_GET_IT(SPI_I2S_IT)); + + /* Get the SPI_I2S_IT index */ + itpos = 0x01 << (SPI_I2S_IT & 0x0F); + + /* Get the SPI_I2S_IT IT mask */ + itmask = SPI_I2S_IT >> 4; + + /* Set the IT mask */ + itmask = 0x01 << itmask; + + /* Get the SPI_I2S_IT enable bit status */ + enablestatus = (SPIx->CR2 & itmask) ; + + /* Check the status of the specified SPI interrupt */ + if (((SPIx->SR & itpos) != (uint16_t)RESET) && enablestatus) + { + /* SPI_I2S_IT is set */ + bitstatus = SET; + } + else + { + /* SPI_I2S_IT is reset */ + bitstatus = RESET; + } + /* Return the SPI_I2S_IT status */ + return bitstatus; +} + +/** + * @brief Clears the SPIx CRC Error (CRCERR) interrupt pending bit. + * @param SPIx: To select the SPIx/I2Sx peripheral, where x can be: 1, 2, 3, 4, 5 or 6 + * in SPI mode or 2 or 3 in I2S mode or I2Sxext for I2S full duplex mode. + * @param SPI_I2S_IT: specifies the SPI interrupt pending bit to clear. + * This function clears only CRCERR interrupt pending bit. + * @arg SPI_IT_CRCERR: CRC Error interrupt. + * + * @note OVR (OverRun Error) interrupt pending bit is cleared by software + * sequence: a read operation to SPI_DR register (SPI_I2S_ReceiveData()) + * followed by a read operation to SPI_SR register (SPI_I2S_GetITStatus()). + * @note UDR (UnderRun Error) interrupt pending bit is cleared by a read + * operation to SPI_SR register (SPI_I2S_GetITStatus()). + * @note MODF (Mode Fault) interrupt pending bit is cleared by software sequence: + * a read/write operation to SPI_SR register (SPI_I2S_GetITStatus()) + * followed by a write operation to SPI_CR1 register (SPI_Cmd() to enable + * the SPI). + * @retval None + */ +void SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT) +{ + uint16_t itpos = 0; + /* Check the parameters */ + assert_param(IS_SPI_ALL_PERIPH_EXT(SPIx)); + assert_param(IS_SPI_I2S_CLEAR_IT(SPI_I2S_IT)); + + /* Get the SPI_I2S IT index */ + itpos = 0x01 << (SPI_I2S_IT & 0x0F); + + /* Clear the selected SPI CRC Error (CRCERR) interrupt pending bit */ + SPIx->SR = (uint16_t)~itpos; +} + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ -- cgit v1.2.3