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drivers: spi: stm32h7 spi drivers with DMA transfer

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This patch controls the SPI of the stm32H7 mcu when using
the DMA transfer. Starting and ending the transfer
are specific according to the RefMan.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2022-01-04 07:49:29 +01:00 • committed by Maureen Helm
commit 1da200bf16
1 changed files with 17 additions and 0 deletions
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17
drivers/spi/spi_ll_stm32.c
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@ -723,7 +723,18 @@ static int transceive_dma(const struct device *dev,
/* This is turned off in spi_stm32_complete(). */
spi_stm32_cs_control(dev, true);
#if defined(CONFIG_SOC_SERIES_STM32H7X)
/* set request before enabling (else SPI CFG1 reg is write protected) */
LL_SPI_EnableDMAReq_RX(spi);
LL_SPI_EnableDMAReq_TX(spi);
LL_SPI_Enable(spi);
if (LL_SPI_GetMode(spi) == LL_SPI_MODE_MASTER) {
LL_SPI_StartMasterTransfer(spi);
}
#else
LL_SPI_Enable(spi);
#endif /* CONFIG_SOC_SERIES_STM32H7X */
while (data->ctx.rx_len > 0 || data->ctx.tx_len > 0) {
size_t dma_len;
@ -743,8 +754,11 @@ static int transceive_dma(const struct device *dev,
break;
}
#if !defined(CONFIG_SOC_SERIES_STM32H7X)
/* toggle the DMA request to restart the transfer */
LL_SPI_EnableDMAReq_RX(spi);
LL_SPI_EnableDMAReq_TX(spi);
#endif /* ! CONFIG_SOC_SERIES_STM32H7X */
ret = wait_dma_rx_tx_done(dev);
if (ret != 0) {
@ -760,8 +774,11 @@ static int transceive_dma(const struct device *dev,
while (ll_func_spi_dma_busy(spi) == 0) {
}
#if !defined(CONFIG_SOC_SERIES_STM32H7X)
/* toggle the DMA transfer request */
LL_SPI_DisableDMAReq_TX(spi);
LL_SPI_DisableDMAReq_RX(spi);
#endif /* ! CONFIG_SOC_SERIES_STM32H7X */
spi_context_update_tx(&data->ctx, 1, dma_len);
spi_context_update_rx(&data->ctx, 1, dma_len);