void at86rf231_gpio_spi_interrupts_init(void)
{
/* set up GPIO pins */
/* SCLK and MOSI*/
GPIOA->CRL &= ~(0xf << (5 * 4));
GPIOA->CRL |= (0xb << (5 * 4));
GPIOA->CRL &= ~(0xf << (7 * 4));
GPIOA->CRL |= (0xb << (7 * 4));
/* MISO */
gpio_init_in(SPI_0_MISO_GPIO, GPIO_NOPULL);
/* SPI init */
spi_init_master(SPI_0, SPI_CONF_FIRST_RISING, SPI_SPEED_5MHZ);
spi_poweron(SPI_0);
/* IRQ0 */
gpio_init_in(SPI_0_IRQ0_GPIO, GPIO_NOPULL);
gpio_init_int(SPI_0_IRQ0_GPIO, GPIO_NOPULL, GPIO_RISING, (gpio_cb_t)at86rf231_rx_irq, NULL);
/* Connect EXTI4 Line to PC4 pin */
at86rf231_enable_interrupts();
/* CS */
gpio_init_out(SPI_0_CS_GPIO, GPIO_NOPULL);
/* SLEEP */
gpio_init_out(SPI_0_SLEEP_GPIO, GPIO_NOPULL);
/* RESET */
gpio_init_out(SPI_0_RESET_GPIO, GPIO_NOPULL);
}
void at86rf231_switch_to_rx(void)
{
at86rf231_disable_interrupts();
// Send a FORCE TRX OFF command
at86rf231_reg_write(AT86RF231_REG__TRX_STATE, AT86RF231_TRX_STATE__FORCE_TRX_OFF);
// Reset IRQ to TRX END only
at86rf231_reg_write(AT86RF231_REG__IRQ_MASK, AT86RF231_IRQ_STATUS_MASK__TRX_END);
// Read IRQ to clear it
at86rf231_reg_read(AT86RF231_REG__IRQ_STATUS);
// Enable IRQ interrupt
at86rf231_enable_interrupts();
// Start RX
at86rf231_reg_write(AT86RF231_REG__TRX_STATE, AT86RF231_TRX_STATE__RX_ON);
// wait until it is on RX_ON state
uint8_t status;
uint8_t max_wait = 100; // TODO : move elsewhere, this is in 10us
do {
status = at86rf231_get_status();
vtimer_usleep(10);
if (!--max_wait) {
printf("at86rf231 : ERROR : could not enter RX_ON mode");
break;
}
}
while ((status & AT86RF231_TRX_STATUS_MASK__TRX_STATUS) != AT86RF231_TRX_STATUS__RX_ON);
}
