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#include <stdint.h>
#include "stm32f4xx_hal.h"
#include "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "pin.h"
#include "genhdr/pins.h"
#include "led.h"
#include "extint.h"
#include "spi.h"
#include "ccspi.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
#define PIN_CS pin_B12 // Y5
#define PIN_EN pin_B9 // Y4
#define PIN_IRQ pin_B8 // Y3
#define SPI_HANDLE SPIHandle2
// 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) {
PIN_EN.gpio->BSRRL = PIN_EN.pin_mask; // set pin high
} else {
PIN_EN.gpio->BSRRH = PIN_EN.pin_mask; // set pin low
}
}
void pyb_cc3000_set_cs(int val) {
DEBUG_printf("pyb_cc3000_set_cs val=%d\n", val);
if (val) {
PIN_CS.gpio->BSRRL = PIN_CS.pin_mask; // set pin high
} else {
PIN_CS.gpio->BSRRH = PIN_CS.pin_mask; // set pin low
}
}
int pyb_cc3000_get_irq(void) {
if ((PIN_IRQ.gpio->IDR & PIN_IRQ.pin_mask) == 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 mp_obj_t irq_callback(mp_obj_t line) {
led_toggle(2);
//extern void SpiIntGPIOHandler(void);
//extern uint32_t exti14_enabled;
//extern uint32_t exti14_missed;
//printf("-> EXTI14 en=%lu miss=%lu\n", exti14_enabled, exti14_missed);
if (exti14_enabled) {
exti14_missed = 0;
SpiIntGPIOHandler(); // CC3000 interrupt
} else {
exti14_missed = 1;
}
//printf("<- EXTI14 done\n");
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(irq_callback_obj, irq_callback);
void pyb_cc3000_spi_init(void) {
DEBUG_printf("pyb_cc3000_spi_init\n");
/*
inf.baudRate = 100000; // FIXME - just slow for debug
inf.spiMode = SPIF_SPI_MODE_1; // Mode 1 CPOL= 0 CPHA= 1
*/
/*!< SPI configuration */
SPI_HANDLE.Init.Mode = SPI_MODE_MASTER;
SPI_HANDLE.Init.Direction = SPI_DIRECTION_2LINES;
SPI_HANDLE.Init.DataSize = SPI_DATASIZE_8BIT; // should be correct
SPI_HANDLE.Init.CLKPolarity = SPI_POLARITY_LOW; // clock is low when idle
SPI_HANDLE.Init.CLKPhase = SPI_PHASE_2EDGE; // data latched on second edge, which is falling edge for low-idle
SPI_HANDLE.Init.NSS = SPI_NSS_SOFT; // software control
SPI_HANDLE.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8; // clock freq = f_PCLK / this_prescale_value
SPI_HANDLE.Init.FirstBit = SPI_FIRSTBIT_MSB; // should be correct
SPI_HANDLE.Init.TIMode = SPI_TIMODE_DISABLED;
SPI_HANDLE.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
SPI_HANDLE.Init.CRCPolynomial = 7; // unused
spi_init(&SPI_HANDLE);
// configure wlan CS and EN pins
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStructure.Pull = GPIO_NOPULL;
GPIO_InitStructure.Alternate = 0;
GPIO_InitStructure.Pin = PIN_CS.pin_mask;
HAL_GPIO_Init(PIN_CS.gpio, &GPIO_InitStructure);
GPIO_InitStructure.Pin = PIN_EN.pin_mask;
HAL_GPIO_Init(PIN_EN.gpio, &GPIO_InitStructure);
pyb_cc3000_set_cs(1); // de-assert CS
pyb_cc3000_set_en(0); // disable wlan
// configure EXTI for PIN_IRQ
extint_register((mp_obj_t)&PIN_IRQ, GPIO_MODE_IT_FALLING, GPIO_PULLUP, (mp_obj_t)&irq_callback_obj, true, NULL);
// wait a little (ensure that WLAN takes effect)
HAL_Delay(500); // force a 500ms delay! FIXME
}
uint8_t pyb_cc3000_spi_send(uint8_t val) {
uint8_t data[1] = {val};
HAL_SPI_TransmitReceive(&SPI_HANDLE, data, data, 1, 1000);
return data[0];
}
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