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kasjer pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/mynewt-core.git
The following commit(s) were added to refs/heads/master by this push:
new 920a92e46 i2s/stm32f4: Fix duplex DMA mode
920a92e46 is described below
commit 920a92e46e8dd54dc204f1080f0982042192afa3
Author: Jerzy Kasenberg <[email protected]>
AuthorDate: Thu Aug 27 09:45:58 2026 +0200
i2s/stm32f4: Fix duplex DMA mode
In I2S duplex mode buffer provided to i2s system
is used for both TX and RX path.
Separate DMA streams are configured for this.
Interrupt was generated for both streams resulting
in notification function call twice for same buffer.
Now TX interrupt handler does nothing in duplex mode.
RX DMA interrupt will fire shortly after TX and only
then buffer can be returned back to the user.
Signed-off-by: Jerzy Kasenberg <[email protected]>
---
hw/drivers/i2s/i2s_stm32f4/src/i2s_stm32f4.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/hw/drivers/i2s/i2s_stm32f4/src/i2s_stm32f4.c
b/hw/drivers/i2s/i2s_stm32f4/src/i2s_stm32f4.c
index b445b62dc..42d854aff 100644
--- a/hw/drivers/i2s/i2s_stm32f4/src/i2s_stm32f4.c
+++ b/hw/drivers/i2s/i2s_stm32f4/src/i2s_stm32f4.c
@@ -668,6 +668,12 @@ i2s_transmit_start_dma(I2S_HandleTypeDef *hi2s, uint16_t
*buf0, uint16_t *buf1,
}
#if I2S_FULLDUPLEX_SUPPORT
+
+static void
+i2s_dma_mx_complete_ignore(DMA_HandleTypeDef *hdma)
+{
+}
+
static HAL_StatusTypeDef
i2s_transmit_receive_dma(I2S_HandleTypeDef *hi2s, uint16_t *buf0, uint16_t
*buf1, uint16_t sample_count)
{
@@ -724,8 +730,8 @@ i2s_transmit_receive_dma(I2S_HandleTypeDef *hi2s, uint16_t
*buf0, uint16_t *buf1
hi2s->hdmarx->Instance->CR &= ~DMA_SxCR_CT_Msk;
/* Set the I2S Tx DMA transfer complete callback */
- hi2s->hdmatx->XferCpltCallback = i2s_dma_m0_complete;
- hi2s->hdmatx->XferM1CpltCallback = i2s_dma_m1_complete;
+ hi2s->hdmatx->XferCpltCallback = i2s_dma_mx_complete_ignore;
+ hi2s->hdmatx->XferM1CpltCallback = i2s_dma_mx_complete_ignore;
/* Set the I2S Tx DMA error callback */
hi2s->hdmatx->XferErrorCallback = i2s_dma_error;
