// This function is called to put data in the SPI buffer when data is added
// to the queue.
void spi_slave_notify() {
uint32_t err_code;
if (!buffer_full) {
// Check if we need to repopulate the SPI buffer with the next
// thing from the queue
uint8_t data_len;
uint8_t len;
uint8_t response_type;
data_len = interrupt_event_queue_get(&response_type, spi_tx_buf+2);
if (data_len > 0) {
buffer_full = true;
len = data_len + 1; // for the response type byte
// Create the response SPI buffer.
spi_tx_buf[0] = len;
spi_tx_buf[1] = response_type;
// Send the TX buffer to the SPI module
err_code = spi_slave_buffers_set(spi_tx_buf,
spi_rx_buf,
SPI_BUF_LEN,
SPI_BUF_LEN);
APP_ERROR_CHECK(err_code);
// Set the interrupt line high
bcp_interrupt_host();
}
}
}
// Callback after a SPI transaction completes (CS goes back high).
static void spi_slave_event_handle(spi_slave_evt_t event) {
uint32_t err_code;
// Check the event type. There are only two events, and only one is useful.
if (event.evt_type == SPI_SLAVE_XFER_DONE) {
// The first byte is the command byte
switch (spi_rx_buf[0]) {
case BCP_CMD_READ_IRQ:
// This message was only to read data. Success.
break;
case BCP_CMD_SNIFF_ADVERTISEMENTS:
// Instructs us to send all advertisements to the host
// bcp_sniff_advertisements();
break;
case BCP_CMD_UPDATE_LED_STATE:
// The LEDs on the CC2538 changed, update the characteristic
main_set_led_state(spi_rx_buf[1]);
break;
default:
break;
}
{
// Check if we need to repopulate the SPI buffer with the next
// thing from the queue
uint8_t data_len;
uint8_t len;
uint8_t response_type;
data_len = interrupt_event_queue_get(&response_type, spi_tx_buf+2);
if (data_len > 0) {
len = data_len + 1; // for the response type byte
// Create the response SPI buffer.
spi_tx_buf[0] = len;
spi_tx_buf[1] = response_type;
// Send the TX buffer to the SPI module
buffer_full = true;
err_code = spi_slave_buffers_set(spi_tx_buf,
spi_rx_buf,
SPI_BUF_LEN,
SPI_BUF_LEN);
APP_ERROR_CHECK(err_code);
} else {
// Still need to set the RX buffer as the reception
// destination
buffer_full = false;
memset(spi_tx_buf, 0x0, SPI_BUF_LEN);
memset(spi_rx_buf, 0x0, SPI_BUF_LEN);
err_code = spi_slave_buffers_set(spi_tx_buf,
spi_rx_buf,
SPI_BUF_LEN,
SPI_BUF_LEN);
APP_ERROR_CHECK(err_code);
bcp_interupt_host_clear();
}
}
} else if (event.evt_type == SPI_SLAVE_BUFFERS_SET_DONE) {
nrf_gpio_pin_toggle(24);
// If we set the buffers, we must have data we want to send
// to the host
if (buffer_full) {
// Set the interrupt line high
bcp_interrupt_host();
}
}
}
