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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 In case of an overrun the data may be already outdated and can be discarded.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 bd8ab302ef4a
children
line wrap: on
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/**
  ******************************************************************************
  * @file    uartProtocol_HUD.h
  * @author  heinrichs weikamp gmbh
  * @version V0.0.1
  * @date    24-Feb-2026
  * @brief	 Interface functionality to handle external, UART based CO2 sensors
  *
  @verbatim
  ==============================================================================
                        ##### How to use #####
  ==============================================================================
  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2014 heinrichs weikamp</center></h2>
  *
  ******************************************************************************
  */

/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef UART_PROTOCOL_HUD_H
#define UART_PROTOCOL_HUD_H

#ifdef __cplusplus
 extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include "configuration.h"
#include "stm32f4xx_hal.h"


#define HUD_INFO_DATA_LENGTH		(24u)	/* expected number of received info data */
#define HUD_MAX_CMD_LENGTH			(32u) 	/* max length for a command sequence */

#define HUD_CMD_BYTE_START			(0xAA)	/* Start byte */
#define HUD_CMD_BYTE_INFO			(0x10)	/* Request HUD info */
#define HUD_CMD_BYTE_UPDATE			(0x20)	/* Update LED sequence command */
#define HUD_CMD_BYTE_STOP			(0x30)	/* Stip LED sequence execution */

 typedef enum
  {
	UART_HUD_INIT = 0,		/* Default Status for every sensor type */
	UART_HUD_IDLE,			/* sensor detected and no communication pending */
	UART_HUD_ERROR,
 	UART_HUD_SETUP = 10,	/* collecting data */
  	UART_HUD_UPDATE,		/* update the HUD status LEDs */
	UART_HUD_ABORT,			/* abort status sequence */
  } uartHUDStatus_t;

  typedef enum
  {
  	HUDRX_Ready= 0,					/* Initial state */
 	HUDRX_DetectStart,				/* validate start byte */
  	HUDRX_RXData,
	HUDRX_CheckSum_L,
	HUDRX_CheckSum_H,
 	HUDRX_DataComplete
  } receiveStateHUD_t;


 typedef enum
 {
	HUDCMD_GETINFO = 0,	/* Get HUD info */
 	HUDCMD_UPDATE,		/* Update LED sequence */
 	HUDCMD_ABORTSEQ		/* Abort LED sequence */
 } hudSensorCmd_t;


void uartHUD_Control(void);
void uartHUD_ProcessData(uint8_t data);
void uartHUD_SendCmd(uint8_t HUDCmd);
uint8_t uartHUD_isSensorConnected();

#endif /* UART_PROTOCOL_HUD_H */