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stm32h7: serial: use dma tx semaphore as resource holder

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This commit is contained in:
Alexander Vasiljev 2021-04-28 10:51:50 +03:00 committed by David Sidrane
parent f4089ab528
commit 940c5b69c3
1 changed files with 2 additions and 8 deletions
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10
arch/arm/src/stm32h7/stm32_serial.c
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@ -2220,7 +2220,7 @@ static int up_dma_setup(struct uart_dev_s *dev)
{ {
priv->txdma = stm32_dmachannel(priv->txdma_channel); priv->txdma = stm32_dmachannel(priv->txdma_channel);
nxsem_init(&priv->txdmasem, 0, 0); nxsem_init(&priv->txdmasem, 0, 1);
nxsem_set_protocol(&priv->txdmasem, SEM_PRIO_NONE); nxsem_set_protocol(&priv->txdmasem, SEM_PRIO_NONE);
/* Enable receive Tx DMA for the UART */ /* Enable receive Tx DMA for the UART */
@ -3369,16 +3369,10 @@ static void up_dma_txcallback(DMA_HANDLE handle, uint8_t status, void *arg)
static void up_dma_txavailable(struct uart_dev_s *dev) static void up_dma_txavailable(struct uart_dev_s *dev)
{ {
struct up_dev_s *priv = (struct up_dev_s *)dev->priv; struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
size_t resid = 0;
resid = stm32_dmaresidual(priv->txdma);
/* Only send when the DMA is idle */ /* Only send when the DMA is idle */
if (resid != 0) nxsem_wait(&priv->txdmasem);
{
nxsem_wait(&priv->txdmasem);
}
uart_xmitchars_dma(dev); uart_xmitchars_dma(dev);
} }