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#include <stdint.h>
#include "stm32f4xx_rcc.h"
#include <stm32f4xx_syscfg.h>
#include "stm32f4xx_gpio.h"
#include <stm32f4xx_exti.h>
#include <stm_misc.h>
#include "stm32f4xx_spi.h"
#include "misc.h"
#include "systick.h"
#include "ccdebug.h"
#include "pybcc3k.h"
// IRQ on PA14, input, pulled up, active low
// EN on PC7, output, active high
// CS on PC6, output, active low
// SPI2 on PB15=MOSI, PB14=MISO, PB13=SCK
// SCK for CC3000: max 16MHz, low when idle, data sampled on falling edge
// TODO this could be really wrong wrt calibration
void pyb_delay_us(uint32_t usec) {
volatile uint32_t count = 0;
const uint32_t utime = (160 * usec / 5);
do {
if (++count > utime) {
return;
}
} while (1);
}
void pyb_cc3000_set_en(int val) {
DEBUG_printf("pyb_cc3000_set_en val=%d\n", val);
if (val) {
GPIOC->BSRRL = GPIO_Pin_7; // set pin high
} else {
GPIOC->BSRRH = GPIO_Pin_7; // set pin low
}
}
void pyb_cc3000_set_cs(int val) {
DEBUG_printf("pyb_cc3000_set_cs val=%d\n", val);
if (val) {
GPIOC->BSRRL = GPIO_Pin_6; // set pin high
} else {
GPIOC->BSRRH = GPIO_Pin_6; // set pin low
}
}
int pyb_cc3000_get_irq(void) {
if ((GPIOA->IDR & GPIO_Pin_14) == 0) {
return 0;
} else {
return 1;
}
}
uint32_t exti14_enabled = 0; // TODO hack; do it properly!
uint32_t exti14_missed = 0; // TODO hack; do it properly!
void pyb_cc3000_enable_irq(void) {
DEBUG_printf("pyb_cc3000_enable_irq: en=%lu miss=%lu\n", exti14_enabled, exti14_missed);
if (exti14_missed) {
/* doesn't look like this is needed
DEBUG_printf("pyb_cc3000_enable_irq: handling missed IRQ\n");
// TODO hack if we have a pending IRQ
extern void SpiIntGPIOHandler(void);
SpiIntGPIOHandler();
*/
exti14_missed = 0;
}
exti14_enabled = 1;
}
void pyb_cc3000_disable_irq(void) {
DEBUG_printf("pyb_cc3000_disable_irq: en=%lu miss=%lu\n", exti14_enabled, exti14_missed);
exti14_enabled = 0;
}
void pyb_cc3000_pause_spi(void) {
DEBUG_printf("pyb_cc3000_pause_spi\n");
exti14_enabled = 0;
}
void pyb_cc3000_resume_spi(void) {
DEBUG_printf("pyb_cc3000_resume_spi\n");
exti14_enabled = 1;
}
static void EXTILine14_Config(void) {
/* Enable SYSCFG clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Configure PA14 pin as pulled-up input */
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Connect EXTI Line14 to PA14 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource14);
/* Configure EXTI Line14, falling edge */
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line = EXTI_Line14;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI15_10 Interrupt to the lowest priority */
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void pyb_cc3000_spi_init(void) {
DEBUG_printf("pyb_cc3000_spi_init\n");
// enable SPI clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
// GPIO clocks should already be enabled
/*!< SPI pins configuration *************************************************/
/*!< Connect SPI pins to AF5 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/*
inf.baudRate = 100000; // FIXME - just slow for debug
inf.spiMode = SPIF_SPI_MODE_1; // Mode 1 CPOL= 0 CPHA= 1
*/
/*!< SPI configuration */
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; // should be correct
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; // clock is low when idle
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; // data latched on second edge, which is falling edge for low-idle
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; // software control
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; // clock freq = f_PCLK / this_prescale_value
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; // should be correct
SPI_InitStructure.SPI_CRCPolynomial = 7; // ?
SPI_Init(SPI2, &SPI_InitStructure);
/*!< Enable the SPI */
SPI_Cmd(SPI2, ENABLE);
/*
// WLAN CS, EN and WALN IRQ Configuration
jshSetPinStateIsManual(WLAN_CS_PIN, false);
jshPinOutput(WLAN_CS_PIN, 1); // de-assert CS
jshSetPinStateIsManual(WLAN_EN_PIN, false);
jshPinOutput(WLAN_EN_PIN, 0); // disable WLAN
jshSetPinStateIsManual(WLAN_IRQ_PIN, true);
jshPinSetState(WLAN_IRQ_PIN, JSHPINSTATE_GPIO_IN_PULLUP); // flip into read mode with pullup
*/
// configure wlan CS and EN pins
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
pyb_cc3000_set_cs(1); // de-assert CS
pyb_cc3000_set_en(0); // disable wlan
// configure EXTI on A14
EXTILine14_Config();
// wait a little (ensure that WLAN takes effect)
sys_tick_delay_ms(500); // force a 500ms delay! FIXME
}
uint8_t pyb_cc3000_spi_send(uint8_t val) {
/*!< Loop while DR register in not emplty */
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
/*!< Send byte through the SPI1 peripheral */
SPI_I2S_SendData(SPI2, val);
/*!< Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
/*!< Return the byte read from the SPI bus */
return SPI_I2S_ReceiveData(SPI2);
}
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