/**+
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  ******************************************************************************+
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  * @file    uartProtocol_Co2.c+
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  * @author  heinrichs weikamp gmbh+
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  * @version V0.0.1+
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  * @date    31-Jul-2023+
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  * @brief   Interface functionality to external, UART based CO2 sensors+
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  *+
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  @verbatim+
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+
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+
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  @endverbatim+
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  ******************************************************************************+
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  * @attention+
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  *+
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  * <h2><center>&copy; COPYRIGHT(c) 2023 heinrichs weikamp</center></h2>+
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  *+
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  ******************************************************************************+
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  */+
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/* Includes ------------------------------------------------------------------*/+
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+
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#include <string.h>+
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#include <uartProtocol_Co2.h>+
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#include "uart.h"+
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#include "externalInterface.h"+
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+
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#ifdef ENABLE_CO2_SUPPORT+
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static uint8_t CO2Connected = 0;						/* Binary indicator if a sensor is connected or not */+
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static receiveStateCO2_t rxState = CO2RX_Ready;+
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+
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+
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+
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float LED_Level = 0.0;							/* Normalized LED value which may be used as indication for the health status of the sensor */+
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float LED_ZeroOffset = 0.0;+
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float pCO2 = 0.0;+
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+
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+
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+
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void uartCo2_SendCmd(uint8_t CO2Cmd, uint8_t *cmdString, uint8_t *cmdLength)+
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{+
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	*cmdLength = 0;+
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+
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	switch (CO2Cmd)+
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	{+
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		case CO2CMD_MODE_POLL:		*cmdLength = snprintf((char*)cmdString, 10, "K 2\r\n");+
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				break;+
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		case CO2CMD_MODE_STREAM:	*cmdLength = snprintf((char*)cmdString, 10, "K 1\r\n");+
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				break;+
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		case CO2CMD_CALIBRATE:		*cmdLength = snprintf((char*)cmdString, 10, "G\r\n");+
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				break;+
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		case CO2CMD_GETDATA:		*cmdLength = snprintf((char*)cmdString, 10, "Q\r\n");+
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				break;+
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		case CO2CMD_GETSCALE:		*cmdLength = snprintf((char*)cmdString, 10, ".\r\n");+
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				break;+
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		default: *cmdLength = 0;+
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			break;+
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	}+
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	if(cmdLength != 0)+
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	{+
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		UART_SendCmdString(cmdString);+
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	}+
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}+
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+
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+
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void uartCo2_Control(void)+
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{+
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	static uint8_t cmdString[10];+
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	static uint8_t cmdLength = 0;+
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	static uint8_t lastComState = 0;+
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+
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	uint8_t activeSensor = externalInterface_GetActiveUartSensor();+
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	uartCO2Status_t localComState = externalInterface_GetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET);+
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+
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	uint8_t *pmap = externalInterface_GetSensorMapPointer(0);+
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+
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+
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	if(localComState == UART_CO2_ERROR)+
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	{+
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		localComState = lastComState;+
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	}+
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+
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	if(localComState == UART_CO2_INIT)+
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	{+
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		CO2Connected = 0;+
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		externalInterface_SetCO2Scale(0.0);+
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		UART_ReadData(SENSOR_CO2, 1);	/* flush buffer */+
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		UART_StartDMA_Receiption(&Uart1Ctrl);+
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		localComState = UART_CO2_SETUP;+
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	}+
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	if(localComState == UART_CO2_SETUP)+
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	{+
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		if(externalInterface_GetCO2Scale() == 0.0)+
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		{+
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			uartCo2_SendCmd(CO2CMD_GETSCALE, cmdString, &cmdLength);+
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		}+
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		else+
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		{+
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			localComState = UART_CO2_IDLE;+
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		}+
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	}+
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	else+
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	{+
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		if(localComState == UART_CO2_CALIBRATE)+
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		{+
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			uartCo2_SendCmd(CO2CMD_CALIBRATE, cmdString, &cmdLength);+
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			localComState = UART_CO2_IDLE;+
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		}+
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		else if(pmap[EXT_INTERFACE_SENSOR_CNT-1] == SENSOR_MUX)		/* sensor is working in polling mode if mux is connected to avoid interference with other sensors */+
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		{+
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			//if(cmdLength == 0)							/* poll data */+
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			if(localComState == UART_CO2_IDLE)+
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			{+
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				if(externalInterface_GetCO2Scale() == 0.0)+
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				{+
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					uartCo2_SendCmd(CO2CMD_GETSCALE, cmdString, &cmdLength);+
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					localComState = UART_CO2_SETUP;+
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				}+
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				else+
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				{+
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					uartCo2_SendCmd(CO2CMD_GETDATA, cmdString, &cmdLength);+
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					localComState = UART_CO2_OPERATING;+
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				}+
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			}+
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			else											/* resend last command */+
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			{+
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				UART_SendCmdString(cmdString);+
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				cmdLength = 0;+
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			}+
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		}+
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		else+
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		{+
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			localComState = UART_CO2_OPERATING;					/* sensor in streaming mode if not connected to mux => operating */+
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			UART_StartDMA_Receiption(&Uart1Ctrl);+
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		}+
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	}+
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	lastComState = localComState;+
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	externalInterface_SetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET,localComState);+
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}+
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+
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+
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void uartCo2_ProcessData(uint8_t data)+
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{+
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	static uint8_t dataType = 0;+
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	static uint32_t dataValue = 0;+
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	uint8_t activeSensor = externalInterface_GetActiveUartSensor();+
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	uartCO2Status_t localComState = externalInterface_GetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET);+
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+
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	if(rxState == CO2RX_Ready)		/* identify data content */+
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	{+
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		switch(data)+
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		{+
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			case 'G':+
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			case 'l':+
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			case 'D':+
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			case 'Z':+
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			case '.':			dataType = data;+
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								rxState = CO2RX_Data0;+
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								dataValue = 0;+
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				break;+
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			case '?':			localComState = UART_CO2_ERROR;+
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				break;+
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			default:			/* unknown or corrupted => ignore */+
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					break;+
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		}+
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	}+
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	else if((data >= '0') && (data <= '9'))+
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	{+
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		if((rxState >= CO2RX_Data0) && (rxState <= CO2RX_Data4))+
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		{+
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			dataValue = dataValue * 10 + (data - '0');+
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			rxState++;+
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			if(rxState == CO2RX_Data5)+
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			{+
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				rxState = CO2RX_DataComplete;+
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			}+
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		}+
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		else	/* protocol error data has max 5 digits */+
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		{+
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			if(rxState != CO2RX_DataComplete)	/* commands will not answer with number values */+
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			{+
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				rxState = CO2RX_Ready;+
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			}+
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		}+
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	}+
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	else if((data == ' ') || (data == '\n'))	/* Abort data detection */+
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	{+
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		if(rxState == CO2RX_DataComplete)+
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		{+
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			CO2Connected = 1;+
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			if(localComState == UART_CO2_SETUP)+
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			{+
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				if(dataType == '.')+
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				{+
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					localComState = UART_CO2_IDLE;+
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				}+
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			}+
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			else+
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			{+
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				localComState = UART_CO2_IDLE;+
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			}+
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			if(externalInterface_GetCO2State() == 0)+
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			{+
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				externalInterface_SetCO2State(EXT_INTERFACE_33V_ON);+
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			}+
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			switch(dataType)+
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			{+
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				case 'D':			externalInterface_SetCO2SignalStrength(dataValue);+
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					break;+
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				case 'l':			LED_ZeroOffset = dataValue;+
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					break;+
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				case 'Z':			externalInterface_SetCO2Value(dataValue);+
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					break;+
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				case '.':			externalInterface_SetCO2Scale(dataValue);+
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					break;+
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				default:			rxState = CO2RX_Ready;+
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					break;+
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			}+
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			rxState = CO2RX_Ready;+
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		}+
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		if(rxState != CO2RX_Data0)	/* reset state machine because message in wrong format */+
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		{+
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			rxState = CO2RX_Ready;+
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		}+
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	}+
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	else+
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	{+
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		if((rxState >= CO2RX_Data0) && (rxState <= CO2RX_Data4))+
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		{+
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			rxState = CO2RX_Ready; /* numerical data expected => abort */+
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		}+
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	}+
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	externalInterface_SetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET,localComState);+
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}+
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+
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uint8_t uartCo2_isSensorConnected()+
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{+
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	return CO2Connected;+
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}+
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+
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#endif+
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