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佛山百度快速排名优化,seo专员,西安市城市建设管理局网站,中国建筑集团有限公司校园招聘调试报告 问题描述 在 Modbus 主站回读数据时#xff0c;eRcvState 一直保持在 STATE_M_RX_IDLE 状态#xff0c;导致无法正常接收数据。经过检查#xff0c;发现问题出在主循环的轮询调用上。 BOOL xMBMasterRTUReceiveFSM( void ) {BOOL xTaskNeedSwitch FALS…调试报告问题描述在 Modbus 主站回读数据时eRcvState一直保持在STATE_M_RX_IDLE状态导致无法正常接收数据。经过检查发现问题出在主循环的轮询调用上。BOOLxMBMasterRTUReceiveFSM(void){BOOL xTaskNeedSwitchFALSE;UCHAR ucByte;assert_param((eSndStateSTATE_M_TX_IDLE)||(eSndStateSTATE_M_TX_XFWR));/* Always read the character. */(void)xMBMasterPortSerialGetByte((CHAR*)ucByte);switch(eRcvState){/* If we have received a character in the init state we have to * wait until the frame is finished. */caseSTATE_M_RX_INIT:vMBMasterPortTimersT35Enable();break;/* In the error state we wait until all characters in the * damaged frame are transmitted. */caseSTATE_M_RX_ERROR:vMBMasterPortTimersT35Enable();break;/* In the idle state we wait for a new character. If a character * is received the t1.5 and t3.5 timers are started and the * receiver is in the state STATE_RX_RECEIVCE and disable early * the timer of respond timeout . */caseSTATE_M_RX_IDLE:/* In time of respond timeout,the receiver receive a frame. * Disable timer of respond timeout and change the transmiter state to idle. */vMBMasterPortTimersDisable();eSndStateSTATE_M_TX_IDLE;usMasterRcvBufferPos0;ucMasterRTURcvBuf[usMasterRcvBufferPos]ucByte;eRcvStateSTATE_M_RX_RCV;/* Enable t3.5 timers. */vMBMasterPortTimersT35Enable();break;/* We are currently receiving a frame. Reset the timer after * every character received. If more than the maximum possible * number of bytes in a modbus frame is received the frame is * ignored. */caseSTATE_M_RX_RCV:if(usMasterRcvBufferPosMB_SER_PDU_SIZE_MAX){ucMasterRTURcvBuf[usMasterRcvBufferPos]ucByte;}else{eRcvStateSTATE_M_RX_ERROR;}vMBMasterPortTimersT35Enable();break;}returnxTaskNeedSwitch;}在这个函数中eRcvState 一直等于0x01 STATE_M_RX_IDLE一次 case STATE_M_RX_RCV的分支都没执行原因分析原始代码中Modbus 主站的轮询函数 eMBMasterPoll() 在主循环中调用频率过高导致状态机无法正常切换。具体代码如下while(1){// 主机轮询eMBMasterPoll();// 非阻塞方式轮询避免 HAL_Delay 占用 CPU。if(HAL_GetTick()-lastPollTime1000){test(MB_USER_READ_CALLBACK);lastPollTimeHAL_GetTick();// 延时1秒}HAL_Delay(MB_POLL_CYCLE_MS);// 延时1秒}解决方案将主循环中的轮询调用调整为合理的频率确保状态机能够正常切换。调整后的代码如下while(1){MX_LWIP_Process();// Modbus 从机轮询eMBPoll();// 主站轮询调整频率以避免回读问题if(HAL_GetTick()-lastPollTime1200){eMBMasterPoll();lastPollTime1HAL_GetTick();// 延时200ms}// 非阻塞方式轮询避免 HAL_Delay 占用 CPU。if(HAL_GetTick()-lastPollTime1000){test(MB_USER_READ_CALLBACK);lastPollTimeHAL_GetTick();// 延时1秒}}总结通过调整主循环中 Modbus 主站轮询的调用频率解决了eRcvState一直保持在STATE_M_RX_IDLE的问题确保了主站能够正常接收数据。此调试过程强调了合理设置轮询频率的重要性避免因调用过于频繁导致状态机无法正常运作。