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drivers: uart: stm32: Fixes timing of TX_DONE generation.

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Corrects TX_DONE generation occuring to early
on async api.
Fixes #33866
Signed-off-by: Zisis Adamos <zisarono@gmail.com>
This commit is contained in:
Zisis Adamos 2021-03-30 12:20:46 +02:00 • committed by Anas Nashif
commit 7235b09bb2
1 changed files with 12 additions and 4 deletions
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16
drivers/serial/uart_stm32.c
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@ -776,6 +776,13 @@ static void uart_stm32_isr(const struct device *dev)
if (data->dma_rx.timeout == 0) {
uart_stm32_dma_rx_flush(dev);
}
} else if (LL_USART_IsEnabledIT_TC(UartInstance) &&
LL_USART_IsActiveFlag_TC(UartInstance)) {
LL_USART_DisableIT_TC(UartInstance);
LL_USART_ClearFlag_TC(UartInstance);
/* Generate TX_DONE event when transmission is done */
async_evt_tx_done(data);
}
/* Clear errors */
@ -893,8 +900,6 @@ void uart_stm32_dma_tx_cb(const struct device *dma_dev, void *user_data,
}
irq_unlock(key);
async_evt_tx_done(data);
}
static void uart_stm32_dma_replace_buffer(const struct device *dev)
@ -987,8 +992,11 @@ static int uart_stm32_async_tx(const struct device *dev,
LOG_DBG("tx: l=%d", data->dma_tx.buffer_length);
/* disable TX interrupt since DMA will handle it */
LL_USART_DisableIT_TC(UartInstance);
/* Clear TC flag */
LL_USART_ClearFlag_TC(UartInstance);
/* Enable TC interrupt so we can signal correct TX done */
LL_USART_EnableIT_TC(UartInstance);
/* set source address */
data->dma_tx.blk_cfg.source_address = (uint32_t)data->dma_tx.buffer;