drivers: spi: driver dma callback function to set transfer flag (c83e2a41) · Commits · Wenxi XU / zephyr

drivers/spi/spi_ll_stm32.c

+4 −45

Original line number	Diff line number	Diff line
		@@ -61,7 +61,6 @@ static void dma_callback(void *arg, u32_t channel, int status)
		{
		/* callback_arg directly holds the client data */
		struct spi_stm32_data *data = arg;
		u32_t periph_addr;

		if (status != 0) {
		LOG_ERR("DMA callback error with channel %d.", channel);
		@@ -72,51 +71,11 @@ static void dma_callback(void *arg, u32_t channel, int status)

		/* identify the origin of this callback */
		if (channel == data->dma_tx.channel) {
		/* spi tx direction has mem as source and periph as dest */
		if (data->ctx.tx_count <= 1) {
		/* if it was the last count, then we are done */
		data->dma_tx.transfer_complete = true;
		} else {
		/* this part of the transfer ends */
		data->dma_tx.transfer_complete = false;
		/*
		* Update the current Tx buffer, decreasing length of
		* data->ctx.tx_count, by its own length
		*/
		spi_context_update_tx(&data->ctx, 1, data->ctx.tx_len);
		/* keep the same dest (peripheral) */
		periph_addr =
		data->dma_tx.dma_cfg.head_block->dest_address;
		/* and reload dma with a new source (memory) buffer */
		dma_reload(data->dev_dma_tx,
		data->dma_tx.channel,
		(u32_t)data->ctx.tx_buf,
		periph_addr,
		data->ctx.tx_len);
		}
		data->dma_tx.transfer_complete = true;
		} else if (channel == data->dma_rx.channel) {
		/* spi rx direction has periph as source and mem as dest */
		if (data->ctx.rx_count <= 1) {
		/* if it was the last count, then we are done */
		data->dma_rx.transfer_complete = true;
		} else {
		/* this part of the transfer ends */
		data->dma_rx.transfer_complete = false;
		/*
		* Update the current Rx buffer, decreasing length of
		* data->ctx.rx_count, by its own length
		*/
		spi_context_update_rx(&data->ctx, 1, data->ctx.rx_len);
		/* keep the same source (peripheral) */
		periph_addr =
		data->dma_rx.dma_cfg.head_block->dest_address;
		/* and reload dma with a new dest (memory) buffer */
		dma_reload(data->dev_dma_rx,
		data->dma_rx.channel,
		periph_addr,
		(u32_t)data->ctx.rx_buf,
		data->ctx.rx_len);
		}
		data->dma_rx.transfer_complete = true;
		} else {
		LOG_ERR("DMA callback channel %d is not valid.", channel);
		data->dma_tx.transfer_complete = true;

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