int hw_spi_transfer (size_t port, size_t buffer_length, const uint8_t *txbuf, uint8_t *rxbuf, uint32_t txref, uint32_t rxref, size_t chunk_size, uint32_t repeat, int8_t chip_select, uint32_t cs_delay_us, void (*callback)())
{
// Make sure that cs pin is high to start
if (chip_select != -1) {
hw_digital_output(chip_select);
hw_digital_write(chip_select, 1);
}
hw_spi_transfer_setup (port, buffer_length, txbuf, rxbuf, txref, rxref, chunk_size, repeat, chip_select, cs_delay_us, callback);
if (repeat == 0 || chunk_size > buffer_length) {
tm_event_trigger(&async_spi_event);
}
hw_spi_transfer_step();
return 0;
}
void default_complete_cb() {
// Pull cs pin high if a cs pin is set
if (spi_async_status.chip_select != -1) {
hw_digital_write(spi_async_status.chip_select, 1);
}
// Set offset to next command in the txbuf
spi_async_status.chunk_offset += spi_async_status.chunk_size;
if ((spi_async_status.chunk_offset + spi_async_status.chunk_size) > spi_async_status.buffer_length) {
spi_async_status.chunk_offset = 0;
if (--spi_async_status.repeat == 0) {
tm_event_trigger(&async_spi_event);
return;
}
}
if (spi_async_status.chip_select != -1) {
hw_wait_us(spi_async_status.cs_delay_us);
}
hw_spi_transfer_step();
}
void hw_timer_update_interrupt()
{
if (tm_timer_waiting()) {
tm_event_trigger(&tm_timer_event);
}
}