stm32/machine_i2s: Correctly set the DMA transfer size.

dpgeorge · dpgeorge · commit c02cf4cc224b · 2022-02-08T18:17:14.000+11:00
Signed-off-by: Damien George &lt;damien@micropython.org&gt;
diff --git a/ports/stm32/machine_i2s.c b/ports/stm32/machine_i2s.c
@@ -584,13 +584,19 @@ STATIC bool i2s_init(machine_i2s_obj_t *self) {
 
     if (HAL_I2S_Init(&self->hi2s) == HAL_OK) {
         // Reset and initialize Tx and Rx DMA channels
+        uint32_t pm_size;
+        if (self->hi2s.Init.DataFormat == I2S_DATAFORMAT_16B) {
+            pm_size = DMA_PDATAALIGN_HALFWORD | DMA_MDATAALIGN_HALFWORD;
+        } else {
+            pm_size = DMA_PDATAALIGN_WORD | DMA_MDATAALIGN_WORD;
+        }
         if (self->mode == I2S_MODE_MASTER_RX) {
             dma_invalidate_channel(self->dma_descr_rx);
-            dma_init(&self->hdma_rx, self->dma_descr_rx, DMA_PERIPH_TO_MEMORY, &self->hi2s);
+            dma_init_with_size(&self->hdma_rx, self->dma_descr_rx, DMA_PERIPH_TO_MEMORY, pm_size, &self->hi2s);
             self->hi2s.hdmarx = &self->hdma_rx;
         } else {  // I2S_MODE_MASTER_TX
             dma_invalidate_channel(self->dma_descr_tx);
-            dma_init(&self->hdma_tx, self->dma_descr_tx, DMA_MEMORY_TO_PERIPH, &self->hi2s);
+            dma_init_with_size(&self->hdma_tx, self->dma_descr_tx, DMA_MEMORY_TO_PERIPH, pm_size, &self->hi2s);
             self->hi2s.hdmatx = &self->hdma_tx;
         }
 
