Mercurial > public > ostc4
changeset 1079:9e1fdb383d86 Icon_Integration
Changed reaction for uart DMA buffer overruns:
In the previous version a DMA was not restarted in case the read pointer is in the chunk which should be filled next. In normal operation this should never happen, in special cases, like debugging, it may occure. In case of an overrun the data may be already outdated and can be discarded. Because of this the new handling of a buffer overflow is to set the read pointer to the start of the chunk => the read function will start with the latest received data. Not yet processed data will be discarded.
| author | Ideenmodellierer |
|---|---|
| date | Sun, 08 Mar 2026 21:04:36 +0100 |
| parents | 082825daccb5 |
| children | b02311fbb1e1 |
| files | Small_CPU/Src/uart.c |
| diffstat | 1 files changed, 7 insertions(+), 6 deletions(-) [+] |
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--- a/Small_CPU/Src/uart.c Mon Mar 02 17:30:38 2026 +0100 +++ b/Small_CPU/Src/uart.c Sun Mar 08 21:04:36 2026 +0100 @@ -302,12 +302,13 @@ { if(pUartCtrl->dmaRxActive == 0) { - if(((pUartCtrl->rxWriteIndex / CHUNK_SIZE) != (pUartCtrl->rxReadIndex / CHUNK_SIZE)) || ((UART_isEndIndication(pUartCtrl, pUartCtrl->rxWriteIndex)) && (UART_isEndIndication(pUartCtrl, pUartCtrl->rxWriteIndex + 1)))) /* start next transfer if we did not catch up with read index */ - { - if(HAL_OK == HAL_UART_Receive_DMA (pUartCtrl->pHandle, &pUartCtrl->pRxBuffer[pUartCtrl->rxWriteIndex], CHUNK_SIZE)) - { - pUartCtrl->dmaRxActive = 1; - } + if((pUartCtrl->rxWriteIndex / CHUNK_SIZE) == (pUartCtrl->rxReadIndex / CHUNK_SIZE)) /* write pointer catched up with read pointer (should never happen) => Reset read pointer to start of block */ + { + pUartCtrl->rxReadIndex = pUartCtrl->rxWriteIndex; + } + if(HAL_OK == HAL_UART_Receive_DMA (pUartCtrl->pHandle, &pUartCtrl->pRxBuffer[pUartCtrl->rxWriteIndex], CHUNK_SIZE)) + { + pUartCtrl->dmaRxActive = 1; } } }