adafruit-mirror/zephyr
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 9

drivers: dma: dma_mcux_edma: fix previous TCD index

Browse source 
fixes issue calculating index of previous TCD in circular list.

Signed-off-by: Derek Snell <derek.snell@nxp.com>
This commit is contained in:
Derek Snell 2024-12-11 19:16:56 -05:00 committed by Benjamin Cabé
parent f510314a28
commit b3d8766126
1 changed files with 8 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/dma/dma_mcux_edma.c
View file

@ -91,7 +91,7 @@ struct dma_mcux_channel_transfer_edma_settings {
/* These parameters are for cyclic mode only.
* Next empty TCD idx which can be used for transfer
*/
volatile int8_t write_idx;
volatile uint8_t write_idx;
/* How many TCDs in TCD pool is emtpy(can be used to write transfer parameters) */
volatile uint8_t empty_tcds;
};
@ -613,6 +613,7 @@ static int dma_mcux_edma_reload(const struct device *dev, uint32_t channel,
edma_tcd_t *tcd = NULL;
edma_tcd_t *pre_tcd = NULL;
uint32_t hw_id, sw_id;
uint8_t pre_idx;
/* Lock the channel configuration */
const unsigned int key = irq_lock();
@ -634,10 +635,14 @@ static int dma_mcux_edma_reload(const struct device *dev, uint32_t channel,
/* Convert size into major loop count */
size = size / data->transfer_settings.dest_data_size;
/* Previous TCD index in circular list */
pre_idx = data->transfer_settings.write_idx - 1;
if (pre_idx >= CONFIG_DMA_TCD_QUEUE_SIZE)
pre_idx = CONFIG_DMA_TCD_QUEUE_SIZE - 1;
/* Configure a TCD for the transfer */
tcd = &(DEV_CFG(dev)->tcdpool[channel][data->transfer_settings.write_idx]);
pre_tcd = &(DEV_CFG(dev)->tcdpool[channel][(data->transfer_settings.write_idx - 1) %
CONFIG_DMA_TCD_QUEUE_SIZE]);
pre_tcd = &(DEV_CFG(dev)->tcdpool[channel][pre_idx]);
EDMA_TCD_SADDR(tcd, kEDMA_EDMA4Flag) = src;
EDMA_TCD_DADDR(tcd, kEDMA_EDMA4Flag) = dst;