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author | heinrichsweikamp |
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date | Wed, 30 Mar 2022 18:01:29 +0200 |
parents | 1b995079c045 |
children | fca2bd25e6e2 |
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/** ****************************************************************************** * @file uart.c * @author heinrichs weikamp gmbh * @version V0.0.1 * @date 27-March-2014 * @brief button control * @verbatim ============================================================================== ##### How to use ##### ============================================================================== @endverbatim ****************************************************************************** * @attention * * <h2><center>© COPYRIGHT(c) 2015 heinrichs weikamp</center></h2> * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "uart.h" #include "externalInterface.h" #include "data_exchange.h" /* Private variables ---------------------------------------------------------*/ #define CHUNK_SIZE (20u) /* the DMA will handle chunk size transfers */ #define CHUNKS_PER_BUFFER (3u) UART_HandleTypeDef huart1; DMA_HandleTypeDef hdma_usart1_rx; uint8_t rxBuffer[CHUNK_SIZE * CHUNKS_PER_BUFFER]; /* The complete buffer has a X * chunk size to allow fariations in buffer read time */ static uint8_t rxWriteIndex; /* Index of the data item which is analysed */ static uint8_t rxReadIndex; /* Index at which new data is stared */ static uint8_t lastCmdIndex; /* Index of last command which has not been completly received */ static uint8_t dmaActive; /* Indicator if DMA receiption needs to be started */ float LED_Level = 0.0; /* Normalized LED value which may be used as indication for the health status of the sensor */ float LED_ZeroOffset = 0.0; float pCO2 = 0.0; /* Exported functions --------------------------------------------------------*/ void MX_USART1_UART_Init(void) { /* regular init */ huart1.Instance = USART1; huart1.Init.BaudRate = 9600; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; HAL_UART_Init(&huart1); rxReadIndex = 0; lastCmdIndex = 0; rxWriteIndex = 0; dmaActive = 0; } void MX_USART1_UART_DeInit(void) { HAL_DMA_DeInit(&hdma_usart1_rx); HAL_UART_DeInit(&huart1); } void MX_USART1_DMA_Init() { /* DMA controller clock enable */ __DMA2_CLK_ENABLE(); /* Peripheral DMA init*/ hdma_usart1_rx.Instance = DMA2_Stream5; hdma_usart1_rx.Init.Channel = DMA_CHANNEL_4; hdma_usart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY; //DMA_MEMORY_TO_PERIPH; hdma_usart1_rx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_usart1_rx.Init.MemInc = DMA_MINC_ENABLE; hdma_usart1_rx.Init.PeriphDataAlignment = DMA_MDATAALIGN_BYTE; hdma_usart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_usart1_rx.Init.Mode = DMA_NORMAL; hdma_usart1_rx.Init.Priority = DMA_PRIORITY_LOW; hdma_usart1_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE; HAL_DMA_Init(&hdma_usart1_rx); __HAL_LINKDMA(&huart1,hdmarx,hdma_usart1_rx); /* DMA interrupt init */ HAL_NVIC_SetPriority(DMA2_Stream5_IRQn, 0, 0); HAL_NVIC_EnableIRQ(DMA2_Stream5_IRQn); } uint32_t dataValue = 0; void HandleUARTData(void) { uint8_t localRX = rxReadIndex; uint8_t dataType = 0; static receiveState_t rxState = RX_Ready; static uint32_t lastReceiveTick = 0; while(localRX != rxWriteIndex) { lastReceiveTick = HAL_GetTick(); if(rxState == RX_Ready) /* identify data content */ { switch(rxBuffer[localRX]) { case 'l': case 'D': case 'Z': dataType = rxBuffer[localRX]; rxState = RX_Data0; dataValue = 0; break; default: /* unknown or corrupted => ignore */ break; } } else if((rxState >= RX_Data0) && (rxState <= RX_Data4)) { if((rxBuffer[localRX] >= '0') && (rxBuffer[localRX] <= '9')) { dataValue = dataValue * 10 + (rxBuffer[localRX] - '0'); rxState++; } } if((rxBuffer[localRX] == ' ') || (rxBuffer[localRX] == '\n')) /* Abort data detection */ { if(rxState == RX_DataComplete) { if(externalInterface_GetCO2State() == 0) { externalInterface_SetCO2State(EXT_INTERFACE_33V_ON); } switch(dataType) { case 'D': externalInterface_SetCO2SignalStrength(dataValue); break; case 'l': LED_ZeroOffset = dataValue; break; case 'Z': externalInterface_SetCO2Value(dataValue); break; default: break; } } if(rxState != RX_Data0) /* reset state machine because message in wrong format */ { rxState = RX_Ready; } } localRX++; rxReadIndex++; if(rxReadIndex >= CHUNK_SIZE * CHUNKS_PER_BUFFER) { localRX = 0; rxReadIndex = 0; } } if(time_elapsed_ms(lastReceiveTick,HAL_GetTick()) > 2000) /* check for communication timeout */ { externalInterface_SetCO2State(0); } if((dmaActive == 0) && (externalInterface_isEnabledPower33())) /* Should never happen in normal operation => restart in case of communication error */ { if(HAL_OK == HAL_UART_Receive_DMA (&huart1, &rxBuffer[rxWriteIndex], CHUNK_SIZE)) { dmaActive = 1; } } } void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if(huart == &huart1) { dmaActive = 0; rxWriteIndex+=CHUNK_SIZE; if(rxWriteIndex >= CHUNK_SIZE * CHUNKS_PER_BUFFER) { rxWriteIndex = 0; } if((rxWriteIndex / CHUNK_SIZE) != (rxReadIndex / CHUNK_SIZE)) /* start next transfer if we did not catch up with read index */ { if(externalInterface_isEnabledPower33()) { if(HAL_OK == HAL_UART_Receive_DMA (&huart1, &rxBuffer[rxWriteIndex], CHUNK_SIZE)) { dmaActive = 1; } } } } } /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/