FIX: dma must always start at rx_buf start

r2axz · Dec 1, 2020 · 4dad6b6 · 4dad6b6
1 parent fa799c3
commit 4dad6b6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/usb_cdc.c b/usb_cdc.c
@@ -354,7 +354,7 @@ static void usb_cdc_port_start_rx(int port) {
     usb_cdc_state_t *cdc_state = &usb_cdc_states[port];
     circ_buf_t *rx_buf = &cdc_state->rx_buf;
     dma_rx_ch->CCR &= ~(DMA_CCR_EN);
-    dma_rx_ch->CMAR = (uint32_t)&rx_buf->data[rx_buf->head];
+    dma_rx_ch->CMAR = (uint32_t)&rx_buf->data;
     dma_rx_ch->CNDTR = USB_CDC_BUF_SIZE;
     dma_rx_ch->CCR |= DMA_CCR_EN;
 }