dimka76
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Пытаюсь освоить HAL
dimka76 ответил Vlad_G тема в ARM, 32bit
Не понятно где вы такое нашли, но вот тело вызываемой вами функции HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) { uint32_t *tmp; /* Check that a Tx process is not already ongoing */ if(huart->gState == HAL_UART_STATE_READY) { if((pData == NULL ) || (Size == 0U)) { return HAL_ERROR; } /* Process Locked */ __HAL_LOCK(huart); huart->pTxBuffPtr = pData; huart->TxXferSize = Size; huart->TxXferCount = Size; huart->ErrorCode = HAL_UART_ERROR_NONE; huart->gState = HAL_UART_STATE_BUSY_TX; /* Set the UART DMA transfer complete callback */ huart->hdmatx->XferCpltCallback = UART_DMATransmitCplt; /* Set the UART DMA Half transfer complete callback */ huart->hdmatx->XferHalfCpltCallback = UART_DMATxHalfCplt; /* Set the DMA error callback */ huart->hdmatx->XferErrorCallback = UART_DMAError; /* Set the DMA abort callback */ huart->hdmatx->XferAbortCallback = NULL; /* Enable the UART transmit DMA Stream */ tmp = (uint32_t*)&pData; HAL_DMA_Start_IT(huart->hdmatx, *(uint32_t*)tmp, (uint32_t)&huart->Instance->DR, Size); /* Clear the TC flag in the SR register by writing 0 to it */ __HAL_UART_CLEAR_FLAG(huart, UART_FLAG_TC); /* Process Unlocked */ __HAL_UNLOCK(huart); /* Enable the DMA transfer for transmit request by setting the DMAT bit in the UART CR3 register */ SET_BIT(huart->Instance->CR3, USART_CR3_DMAT); return HAL_OK; } else { return HAL_BUSY; } } Непосредственно перед выходом из функции SET_BIT(huart->Instance->CR3, USART_CR3_DMAT);
