bool spi_init(struct spi_bus *bus)
{
#ifdef DEBUG_LED
/* Grab a debug LED for testing. */
pin_enable(DEBUG_LED);
pin_reset(DEBUG_LED);
pin_set_mode(DEBUG_LED, PIN_MODE_OUTPUT);
pin_set_otype(DEBUG_LED, PIN_TYPE_PUSHPULL);
pin_set_ospeed(DEBUG_LED, PIN_SPEED_2MHZ);
#endif
#ifdef ERROR_LED
pin_enable(ERROR_LED);
pin_reset(ERROR_LED);
pin_set_mode(ERROR_LED, PIN_MODE_OUTPUT);
pin_set_otype(ERROR_LED, PIN_TYPE_PUSHPULL);
pin_set_ospeed(ERROR_LED, PIN_SPEED_2MHZ);
#endif
rcc_enable(bus->rcc_dev);
/* Configure GPIO pins for SPI operation. */
pin_enable(bus->miso_pin);
pin_set_af(bus->miso_pin, bus->af);
pin_set_mode(bus->miso_pin, PIN_MODE_AF);
pin_set_pupd(bus->miso_pin, PIN_PUPD_NONE);
pin_enable(bus->mosi_pin);
pin_set_af(bus->mosi_pin, bus->af);
pin_set_mode(bus->mosi_pin, PIN_MODE_AF);
pin_set_otype(bus->mosi_pin, PIN_TYPE_PUSHPULL);
pin_enable(bus->sck_pin);
pin_set_af(bus->sck_pin, bus->af);
pin_set_mode(bus->sck_pin, PIN_MODE_AF);
pin_set_otype(bus->sck_pin, PIN_TYPE_PUSHPULL);
bus->lock = xSemaphoreCreateMutex();
if (bus->lock == NULL)
goto fail;
vSemaphoreCreateBinary(bus->complete);
if (bus->complete == NULL)
goto fail;
/* Take the semaphore initially so we will block next time. */
xSemaphoreTake(bus->complete, portMAX_DELAY);
interrupt_set_priority(bus->irq, INTERRUPT_PRIORITY_FREERTOS_SAFE);
return true;
fail:
if (bus->lock != NULL)
vSemaphoreDelete(bus->lock);
if (bus->complete != NULL)
vSemaphoreDelete(bus->complete);
return false;
}
static void led_pin_setup(struct pin *pin) {
pin_enable(pin);
pin_set_mode(pin, PIN_MODE_OUTPUT);
pin_set_otype(pin, PIN_TYPE_PUSHPULL);
pin_set_ospeed(pin, PIN_SPEED_2MHZ);
pin_set_pupd(pin, PIN_PUPD_NONE);
pin_reset(pin);
}
void spi_device_init(struct spi_device *device)
{
pin_enable(device->chip_select);
spi_device_deselect(device);
pin_set_mode(device->chip_select, PIN_MODE_OUTPUT);
pin_set_otype(device->chip_select, PIN_TYPE_PUSHPULL);
pin_set_ospeed(device->chip_select, PIN_SPEED_2MHZ);
}
