int main(void)
{
// Enable the constant latency sub power mode to minimize the time it takes
// for the SPIS peripheral to become active after the CSN line is asserted
// (when the CPU is in sleep mode).
NRF_POWER->TASKS_CONSTLAT = 1;
LEDS_CONFIGURE(BSP_LED_0_MASK);
LEDS_OFF(BSP_LED_0_MASK);
APP_ERROR_CHECK(NRF_LOG_INIT());
NRF_LOG_PRINTF("SPIS example\n");
nrf_drv_spis_config_t spis_config = NRF_DRV_SPIS_DEFAULT_CONFIG(SPIS_INSTANCE);
spis_config.csn_pin = SPIS_CS_PIN;
APP_ERROR_CHECK(nrf_drv_spis_init(&spis, &spis_config, spis_event_handler));
while(1)
{
memset(m_rx_buf, 0, m_length);
spis_xfer_done = false;
APP_ERROR_CHECK(nrf_drv_spis_buffers_set(&spis, m_tx_buf, m_length, m_rx_buf, m_length));
while (!spis_xfer_done)
{
__WFE();
}
LEDS_INVERT(BSP_LED_0_MASK);
}
}
uint32_t spi_slave_example_init(void)
{
uint32_t err_code;
nrf_drv_spis_config_t spis_config = NRF_DRV_SPIS_DEFAULT_CONFIG(SPIS_INSTANCE_NUMBER);
spis_config.miso_pin = SPIS_MISO_PIN;
spis_config.mosi_pin = SPIS_MOSI_PIN;
spis_config.sck_pin = SPIS_SCK_PIN;
spis_config.csn_pin = SPIS_CSN_PIN;
spis_config.mode = NRF_DRV_SPIS_MODE_0;
spis_config.bit_order = NRF_DRV_SPIS_BIT_ORDER_LSB_FIRST;
spis_config.def = DEF_CHARACTER;
spis_config.orc = ORC_CHARACTER;
err_code = nrf_drv_spis_init(&m_spis, &spis_config, spi_slave_event_handle);
APP_ERROR_CHECK(err_code);
//Initialize buffers.
spi_slave_buffers_init(m_tx_buf, m_rx_buf, (uint16_t)TX_BUF_SIZE);
//Set buffers.
err_code = nrf_drv_spis_buffers_set(&m_spis, m_tx_buf, sizeof(m_tx_buf), m_rx_buf, sizeof(m_rx_buf));
APP_ERROR_CHECK(err_code);
return NRF_SUCCESS;
}
/* ser_phy API function */
uint32_t ser_phy_open(ser_phy_events_handler_t events_handler)
{
uint32_t err_code;
nrf_drv_spis_config_t spi_slave_config;
nrf_drv_spis_event_t event;
if (m_trans_state != SPI_RAW_STATE_UNKNOWN)
{
return NRF_ERROR_INVALID_STATE;
}
if (events_handler == NULL)
{
return NRF_ERROR_NULL;
}
//one ppi channel and one gpiote channel are used to drive RDY line
m_spi_slave_raw_config.pin_req = SER_PHY_SPI_SLAVE_REQ_PIN;
m_spi_slave_raw_config.pin_rdy = SER_PHY_SPI_SLAVE_RDY_PIN;
m_spi_slave_raw_config.ppi_rdy_ch = SER_PHY_SPI_PPI_RDY_CH;
m_spi_slave_raw_config.gpiote_rdy_ch = SER_PHY_SPI_GPIOTE_RDY_CH;
spi_slave_gpio_init();
#ifndef _SPI_5W_
spi_slave_gpiote_init();
spi_slave_ppi_init();
#endif
spi_slave_config.miso_pin = SPIS_MISO_PIN;
spi_slave_config.mosi_pin = SPIS_MOSI_PIN;
spi_slave_config.sck_pin = SPIS_SCK_PIN;
spi_slave_config.csn_pin = SPIS_CSN_PIN;
spi_slave_config.mode = NRF_DRV_SPIS_MODE_0;
spi_slave_config.bit_order = NRF_DRV_SPIS_BIT_ORDER_LSB_FIRST;
spi_slave_config.def = SER_PHY_SPI_DEF_CHARACTER;
spi_slave_config.orc = SER_PHY_SPI_ORC_CHARACTER;
spi_slave_config.csn_pullup = NRF_GPIO_PIN_PULLUP;
spi_slave_config.irq_priority = NRF_APP_PRIORITY_LOW;
//keep /CS high when init
nrf_gpio_cfg_input(spi_slave_config.csn_pin, NRF_GPIO_PIN_PULLUP);
err_code = nrf_drv_spis_init(&m_spis, &spi_slave_config, spi_slave_event_handle);
APP_ERROR_CHECK(err_code);
if (err_code == NRF_SUCCESS)
{
m_ser_phy_callback = events_handler;
m_trans_state = SPI_RAW_STATE_SETUP_HEADER;
event.evt_type = NRF_DRV_SPIS_EVT_TYPE_MAX; //force transition for dummy event
event.rx_amount = 0;
event.tx_amount = 0;
spi_slave_event_handle(event);
}
return err_code;
}
void spi_format(spi_t *obj, int bits, int mode, int slave)
{
if (bits != 8) {
error("Only 8-bits SPI is supported\r\n");
}
if (mode > 3) {
error("SPI format error\r\n");
}
spi_info_t *p_spi_info = SPI_INFO(obj);
if (slave)
{
nrf_drv_spis_mode_t spi_modes[4] = {
NRF_DRV_SPIS_MODE_0,
NRF_DRV_SPIS_MODE_1,
NRF_DRV_SPIS_MODE_2,
NRF_DRV_SPIS_MODE_3,
};
nrf_drv_spis_mode_t new_mode = spi_modes[mode];
// If the peripheral is currently working as a master, the SDK driver
// it uses needs to be switched from SPI to SPIS.
if (p_spi_info->master) {
nrf_drv_spi_uninit(MASTER_INST(obj));
}
// I the SPI mode has to be changed, the SDK's SPIS driver needs to be
// re-initialized (there is no other way to change its configuration).
else if (p_spi_info->spi_mode != (uint8_t)new_mode) {
nrf_drv_spis_uninit(SLAVE_INST(obj));
}
else {
return;
}
p_spi_info->spi_mode = (uint8_t)new_mode;
p_spi_info->master = false;
p_spi_info->flag.readable = false;
// Initialize SDK's SPIS driver with the new configuration.
nrf_drv_spis_config_t config;
prepare_slave_config(&config, p_spi_info);
(void)nrf_drv_spis_init(SLAVE_INST(obj), &config,
m_slave_event_handlers[SPI_IDX(obj)]);
// Prepare the slave for transfer.
p_spi_info->tx_buf = NRF_DRV_SPIS_DEFAULT_ORC;
nrf_drv_spis_buffers_set(SLAVE_INST(obj),
(uint8_t const *)&p_spi_info->tx_buf, 1,
(uint8_t *)&p_spi_info->rx_buf, 1);
}
else // master
{
nrf_drv_spi_mode_t spi_modes[4] = {
NRF_DRV_SPI_MODE_0,
NRF_DRV_SPI_MODE_1,
NRF_DRV_SPI_MODE_2,
NRF_DRV_SPI_MODE_3,
};
nrf_drv_spi_mode_t new_mode = spi_modes[mode];
// If the peripheral is currently working as a slave, the SDK driver
// it uses needs to be switched from SPIS to SPI.
if (!p_spi_info->master) {
nrf_drv_spis_uninit(SLAVE_INST(obj));
}
// I the SPI mode has to be changed, the SDK's SPI driver needs to be
// re-initialized (there is no other way to change its configuration).
else if (p_spi_info->spi_mode != (uint8_t)new_mode) {
nrf_drv_spi_uninit(MASTER_INST(obj));
}
else {
return;
}
p_spi_info->spi_mode = (uint8_t)new_mode;
p_spi_info->master = true;
p_spi_info->flag.busy = false;
// Initialize SDK's SPI driver with the new configuration.
nrf_drv_spi_config_t config;
prepare_master_config(&config, p_spi_info);
(void)nrf_drv_spi_init(MASTER_INST(obj), &config,
m_master_event_handlers[SPI_IDX(obj)]);
}
}
