/* Shift a SPI frame as slave. */
static void spi_stm32_shift_s(SPI_TypeDef *spi, struct spi_stm32_data *data)
{
u8_t tx_frame;
u8_t rx_frame;
tx_frame = spi_stm32_next_tx(data);
if (LL_SPI_IsActiveFlag_TXE(spi)) {
LL_SPI_TransmitData8(spi, tx_frame);
/* The update is ignored if TX is off. */
spi_context_update_tx(&data->ctx, 1);
}
if (LL_SPI_IsActiveFlag_RXNE(spi)) {
rx_frame = LL_SPI_ReceiveData8(spi);
if (spi_context_rx_on(&data->ctx)) {
*data->ctx.rx_buf = rx_frame;
spi_context_update_rx(&data->ctx, 1);
}
}
}
static void pull_data(struct device *dev)
{
const struct spi_dw_config *info = dev->config->config_info;
struct spi_dw_data *spi = dev->driver_data;
DBG_COUNTER_INIT();
while (read_rxflr(info->regs)) {
u32_t data = read_dr(info->regs);
DBG_COUNTER_INC();
if (spi_context_rx_buf_on(&spi->ctx)) {
switch (spi->dfs) {
case 1:
UNALIGNED_PUT(data, (u8_t *)spi->ctx.rx_buf);
break;
case 2:
UNALIGNED_PUT(data, (u16_t *)spi->ctx.rx_buf);
break;
#ifndef CONFIG_ARC
case 4:
UNALIGNED_PUT(data, (u32_t *)spi->ctx.rx_buf);
break;
#endif
}
}
spi_context_update_rx(&spi->ctx, spi->dfs, 1);
spi->fifo_diff--;
}
if (!spi->ctx.rx_len && spi->ctx.tx_len < DW_SPI_FIFO_DEPTH) {
write_rxftlr(spi->ctx.tx_len - 1, info->regs);
} else if (read_rxftlr(info->regs) >= spi->ctx.rx_len) {
write_rxftlr(spi->ctx.rx_len - 1, info->regs);
}
LOG_DBG("Pulled: %d", DBG_COUNTER_RESULT());
}