stm32接GP2Y1051

liweidxh

PC端口串口接收的GP2Y1051的数据：

换成stm32接收到的数据，调试的时候发现第一位不是48，就是00，有时候是AA。

[mw_shl_code=c,true]void USART2_IRQHandler(void) { u8 rx_data; if(USART_GetITStatus(USART2,USART_IT_RXNE) != RESET) { rx_data = USART_ReceiveData(USART2)&0xFF; /* 从接收数据寄存器读取一个字节 */ /*第一个数值*/ switch(uchGP2YRxState) { case GP2Y_RX_STATE_START: if(rx_data == 0xaa) { uaGP2Y[uchindex++]=rx_data; uchGP2YRxState = GP2Y_RX_STATE_VOUTH; } else { uchGP2YRxState = GP2Y_RX_STATE_START; uchindex = 0; } break; /*存放第二个数值*/ case GP2Y_RX_STATE_VOUTH: uaGP2Y[uchindex++]=rx_data; uchGP2YRxState = GP2Y_RX_STATE_VOUTL; uchCheckSum+=rx_data;//校验和第1次加 break; /*存放第三个数值*/ case GP2Y_RX_STATE_VOUTL: uaGP2Y[uchindex++]=rx_data; uchGP2YRxState = GP2Y_RX_STATE_VREFH; uchCheckSum+=rx_data;//校验和第2次加 break; /*第四个数值*/ case GP2Y_RX_STATE_VREFH: uaGP2Y[uchindex++]=rx_data; uchGP2YRxState = GP2Y_RX_STATE_VREFL; uchCheckSum+=rx_data;//校验和第3次加 break; /*第五个数值*/ case GP2Y_RX_STATE_VREFL: uaGP2Y[uchindex++]=rx_data; uchGP2YRxState = GP2Y_RX_STATE_CHKSUM; uchCheckSum+=rx_data;//校验和第4次加 break; /*第六个数值，进行校验和*/ case GP2Y_RX_STATE_CHKSUM: if(rx_data == uchCheckSum) { uchCheckSum = 0; uchGP2YRxState = GP2Y_RX_STATE_START; uchindex = 0; GP2Ydata_temp[0] = uaGP2Y[1]; GP2Ydata_temp[1] = uaGP2Y[2]; GP2YGatherOver = 1; } else { uchGP2YRxState = GP2Y_RX_STATE_START; uchindex = 0; } break; } USART_ClearITPendingBit(USART2, USART_IT_RXNE); /* 清除uart2接收中断 */ }//if(USART_GetITStatus(USART2,USART_IT_RXNE) != RESET)[/mw_shl_code]

[mw_shl_code=c,true]串口的配置： if(uchUartPort == UART_2) { USART_DeInit(USART2); /* Release reset */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); /* and enable clock */ /* GPIO Init,Assign PA2 to UART1 (Tx);Assign PA3 to UART1 (Rx) */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE); /* Enable GPIO clock */ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_Init(GPIOA, &GPIO_InitStructure); USART_Init(USART2,&UART_InitStructure); /* Init UART1 */ USART_ClearFlag(USART2, USART_FLAG_CTS | USART_FLAG_LBD | USART_FLAG_TXE | USART_FLAG_TC | USART_FLAG_RXNE | USART_FLAG_IDLE | USART_FLAG_ORE | USART_FLAG_NE | USART_FLAG_FE | USART_FLAG_PE); /* Enable UART2 interrupts */ USART_ITConfig(USART2,USART_IT_PE ,DISABLE); /* 校验错误 */ USART_ITConfig(USART2,USART_IT_TC ,DISABLE); /* 发送完成 */ USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); /* 读数据寄存器非空 */ USART_ITConfig(USART2,USART_IT_TXE, DISABLE); /* 发送数据寄存器空 */ USART_ITConfig(USART2,USART_IT_IDLE,DISABLE); /* 总线空闲检测 */ USART_ITConfig(USART2,USART_IT_LBD ,DISABLE); /* lin断开检测 */ USART_ITConfig(USART2,USART_IT_CTS ,DISABLE); /* 允许发送 */ USART_ITConfig(USART2,USART_IT_ERR ,DISABLE); /* 噪声,多缓冲通信中的溢出错误和帧错误 */ USART_Cmd(USART2, ENABLE); /* Enable the UART1 */ NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); }[/mw_shl_code]

正点原子

帮顶。。。。