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Improvment external interface usage: The previous implementation of the external interface was straight forward for ADC and Co2 UART usage. The new implementation provides the possibility to configurate the behavior of the external interface. e.g. Switching of external3,3V and ADC separatly and selection of UART protocol.
author Ideenmodellierer
date Fri, 05 Aug 2022 15:26:28 +0200
parents fca2bd25e6e2
children f1b40364b0af
line wrap: on
line source

/**
  ******************************************************************************
  * @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>&copy; 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);
}

void ConvertByteToHexString(uint8_t byte, char* str)
{
	uint8_t worker = 0;
	uint8_t digit = 0;
	uint8_t digitCnt = 1;

	worker = byte;
	while((worker!=0) && (digitCnt != 255))
	{
		digit = worker % 16;
		if( digit < 10)
		{
			digit += '0';
		}
		else
		{
			digit += 'A' - 10;
		}
		str[digitCnt--]= digit;
		worker = worker / 16;
	}
}


#ifdef ENABLE_CO2_SUPPORT
void HandleUARTCO2Data(void)
{
	uint8_t localRX = rxReadIndex;
	uint8_t dataType = 0;
	uint32_t dataValue = 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;
		}
	}
}
#endif

#ifdef ENABLE_SENTINEL_MODE
void HandleUARTSentinelData(void)
{
	uint8_t localRX = rxReadIndex;
	static uint8_t dataType = 0;
	static uint32_t dataValue[3];
	static uint8_t dataValueIdx = 0;
	static receiveState_t rxState = RX_Ready;
	static uint32_t lastReceiveTick = 0;
	static uint8_t lastAlive = 0;
	static uint8_t curAlive = 0;
	static uint8_t checksum = 0;
	char checksum_str[]="00";

	while(localRX != rxWriteIndex)
	{
		lastReceiveTick = HAL_GetTick();

		switch(rxState)
		{
			case RX_Ready:	if((rxBuffer[localRX] >= 'a') && (rxBuffer[localRX] <= 'z'))
							{
								rxState = RX_DetectStart;
								curAlive = rxBuffer[localRX];
								checksum = 0;
							}
					break;

			case RX_DetectStart: 	checksum += rxBuffer[localRX];
									if(rxBuffer[localRX] == '1')
								 	{
								 		rxState = RX_SelectData;
								 		dataType = 0xFF;

								 	}
									else
									{
										rxState = RX_Ready;
									}
					break;

			case RX_SelectData:		checksum += rxBuffer[localRX];
									switch(rxBuffer[localRX])
									{
										case 'T':	dataType = rxBuffer[localRX];
											break;
										case '0': 	if(dataType != 0xff)
													{
														rxState = RX_Data0;
														dataValueIdx = 0;
														dataValue[0] = 0;

													}
													else
													{
														rxState = RX_Ready;
													}
											break;
										default:	rxState = RX_Ready;
									}
					break;

			case RX_Data0:
			case RX_Data1:
			case RX_Data2:
			case RX_Data4:
			case RX_Data5:
			case RX_Data6:
			case RX_Data8:
			case RX_Data9:
			case RX_Data10: checksum += rxBuffer[localRX];
							if((rxBuffer[localRX] >= '0') && (rxBuffer[localRX] <= '9'))
							{
								dataValue[dataValueIdx] = dataValue[dataValueIdx] * 10 + (rxBuffer[localRX] - '0');
								rxState++;
							}
							else
							{
								rxState = RX_Ready;
							}
					break;

			case RX_Data3:
			case RX_Data7:	checksum += rxBuffer[localRX];
							if(rxBuffer[localRX] == '0')
							{
								rxState++;
								dataValueIdx++;
								dataValue[dataValueIdx] = 0;
							}
							else
							{
								rxState = RX_Ready;
							}
					break;
			case RX_Data11: rxState = RX_DataComplete;
							ConvertByteToHexString(checksum,checksum_str);
							if(rxBuffer[localRX] == checksum_str[0])
							{
								rxState = RX_DataComplete;
							}
							else
							{
								rxState = RX_Ready;
							}

				break;

			case RX_DataComplete:	if(rxBuffer[localRX] == checksum_str[1])
									{
										setExternalInterfaceChannel(0,(float)(dataValue[0] / 10.0));
										setExternalInterfaceChannel(1,(float)(dataValue[1] / 10.0));
										setExternalInterfaceChannel(2,(float)(dataValue[2] / 10.0));
									}
									rxState = RX_Ready;
				break;


			default:				rxState = RX_Ready;
				break;

		}

		localRX++;
		rxReadIndex++;
		if(rxReadIndex >= CHUNK_SIZE * CHUNKS_PER_BUFFER)
		{
			localRX = 0;
			rxReadIndex = 0;
		}
	}

	if(time_elapsed_ms(lastReceiveTick,HAL_GetTick()) > 4000)	/* check for communication timeout */
	{
		if(curAlive == lastAlive)
		{
			setExternalInterfaceChannel(0,0.0);
			setExternalInterfaceChannel(1,0.0);
			setExternalInterfaceChannel(2,0.0);
		}
		lastAlive = curAlive;
	}

	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;
		}
	}
}
#endif

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****/