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真的是超级新手，完全小白，希望能有大师指点一下，非常感谢！
我的任务是用串口助手从PC向单片机通过UART0发送一个信号，然后再用UART3将这个信号传递给外部连接的电池（中间通过RS485收发器转换电平，P2.12是作为RS485收发器的Enable引脚）。电池收到信号后，通过UART3返回信号到单片机，再经过UART0返回到电脑显示在串口助手上。 现在发送和接受都有问题，但是我真的太新手，完全不知道该从哪里下手解决问题。 我觉得UART的初始化和timer的初始化应该是没有问题的，主要问题应该在UART0_IRQHander和UART3_IRQHander里，希望各位前辈能提提意见，不胜感谢！ #ifdef __USE_CMSIS #include "LPC17xx.h" #endif #include "stdutils.h" #define SBIT_WordLenght 0x00u #define SBIT_DLAB 0x07u #define SBIT_FIFO 0x00u #define SBIT_RxFIFO 0x01u #define SBIT_TxFIFO 0x02u #define SBIT_RDR 0x00u #define SBIT_THRE 0x05u uint8_t Uart0RecvBuf; uint8_t Uart3RecvBuf; #define SBIT_TIMER0 1 #define SBIT_TIMER1 2 #define SBIT_MR0I 0 #define SBIT_MR0R 1 #define SBIT_CNTEN 0 #define PCLK_TIMER0 2 #define PCLK_TIMER1 4 #define MiliToMicroSec(x) (x) // ms is multiplied by 1000 to get us extern unsigned int SystemCoreClock; unsigned int getPrescalarForUs0(uint8_t timerPclkBit); // Function to initialize the UART0 and UART3 at specific baud rate void uart_init(uint32_t baudrate) { uint32_t var_UartPclk_u32_0,var_Pclk_u32_0,var_RegValue_u32_0; uint32_t var_UartPclk_u32_3,var_Pclk_u32_3,var_RegValue_u32_3; LPC_SC->PCONP |= (1<<3)|(1<<25); //enable UART0,UART3 power/clock control bit LPC_PINCON->PINSEL0 &= ~0x000000FF; LPC_PINCON->PINSEL0 |= 0x0000005A; // Enable TxD3 P0.0 and P0.1,TxD0 P0.2 and p0.3 LPC_UART0->FCR = (1< LPC_UART0->LCR = (0x03< LPC_UART3->FCR = (1< LPC_UART3->LCR = (0x03< var_UartPclk_u32_0 = (LPC_SC->PCLKSEL0 >> 6) & 0x03; var_UartPclk_u32_3 = (LPC_SC->PCLKSEL1 >> 18) & 0x03; switch( var_UartPclk_u32_0 ) { case 0x00: var_Pclk_u32_0 = SystemCoreClock/4; break; case 0x01: var_Pclk_u32_0 = SystemCoreClock; break; case 0x02: var_Pclk_u32_0 = SystemCoreClock/2; break; case 0x03: var_Pclk_u32_0 = SystemCoreClock/8; break; } var_RegValue_u32_0 = ( var_Pclk_u32_0 / (16 * baudrate )); LPC_UART0->DLL = var_RegValue_u32_0 & 0xFF; LPC_UART0->DLM = (var_RegValue_u32_0 >> 0x08) & 0xFF; switch( var_UartPclk_u32_3 ) { case 0x00: var_Pclk_u32_3 = SystemCoreClock/4; break; case 0x01: var_Pclk_u32_3 = SystemCoreClock; break; case 0x02: var_Pclk_u32_3 = SystemCoreClock/2; break; case 0x03: var_Pclk_u32_3 = SystemCoreClock/8; break; } var_RegValue_u32_3 = ( var_Pclk_u32_3 / (16 * baudrate )); LPC_UART3->DLL = var_RegValue_u32_3 & 0xFF; LPC_UART3->DLM = (var_RegValue_u32_3 >> 0x08) & 0xFF; util_BitClear(LPC_UART0->LCR,(SBIT_DLAB)); // Clear DLAB after setting DLL,DLM util_BitClear(LPC_UART3->LCR,(SBIT_DLAB)); LPC_UART0->IER = 0x01; //enable RDA interrupt LPC_UART3->IER = 0x01; NVIC_EnableIRQ(UART0_IRQn); NVIC_EnableIRQ(UART3_IRQn); } unsigned int getPrescalarForUs0(uint8_t timerPclkBit) { unsigned int pclk,prescalarForUs; pclk = (LPC_SC->PCLKSEL0 >> timerPclkBit) & 0x03; /* get the pclk info for required timer */ switch ( pclk ) /* Decode the bits to determine the pclk*/ { case 0x00: pclk = SystemCoreClock/4; break; case 0x01: pclk = SystemCoreClock; break; case 0x02: pclk = SystemCoreClock/2; break; case 0x03: pclk = SystemCoreClock/8; break; default: pclk = SystemCoreClock/4; break; } prescalarForUs =pclk/1000000; /* Prescalar for 1us (1000000Counts/sec) */ return prescalarForUs; } //Initialize P2.12 as RS485-Transceiver Enable void Pin_Init(void) { LPC_PINCON->PINSEL4 &= (~(1<<24)&(1<<25)); //set p2.12 as GPIO LPC_GPIO2->FIODIR |= (1<<12); //set P2.12 as output } //Data send from PC to Battery //UART0 Receive (from PC) uint8_t uart0_Receive() { while(util_IsBitCleared(LPC_UART0->LSR,SBIT_RDR)); // Wait till the data is received return(LPC_UART0->RBR); // Read received data } void uart3_Transmit(uint8_t ch) { while(util_IsBitCleared(LPC_UART3->LSR,SBIT_THRE)); // Wait for Previous transmission LPC_UART3->THR=ch; // Load the data to be transmitted } //Data receive from Battery to PC //UART3 Receive (from Battery) uint8_t uart3_Receive() { while(util_IsBitCleared(LPC_UART3->LSR,SBIT_RDR)); // Wait till the data is received return(LPC_UART3->RBR); // Read received data } void uart0_Transmit(uint8_t ch) { while(util_IsBitCleared(LPC_UART0->LSR,SBIT_THRE)); // Wait for Previous transmission LPC_UART0->THR=ch; // Load the data to be transmitted } //PC interface receive: void UART0_IRQHandler(void) { NVIC_EnableIRQ(TIMER0_IRQn); // Enable Timer0 //NVIC_DisableIRQ(UART0_IRQn); // Disable UART0_Interrupt if(((LPC_UART0->IIR>>1) & 0x07) == 0x02) { LPC_UART0->IER = 0x00; LPC_GPIO2->FIOSET |= (1<<12); // Set P2.12 to high Uart0RecvBuf = uart0_Receive(); // UART0 Receive LPC_UART0->IER = 0x01; // Enable RDA Interrupt uart3_Transmit(Uart0RecvBuf); // UART3 Transmit } } void UART3_IRQHandler(void) { NVIC_EnableIRQ(TIMER1_IRQn); // Enable Timer1 //NVIC_DisableIRQ(UART3_IRQn); // Disable UART3_Interrupt if(((LPC_UART3->IIR>>1) & 0x03) == 0x02) { LPC_UART3->IER = 0x00; LPC_GPIO2->FIOCLR |= (1<<12); // Set P2.12 to low Uart3RecvBuf = uart3_Receive(); // UART0 Receive LPC_UART3->IER = 0x01; // Enable RDA Interrupt uart0_Transmit(Uart3RecvBuf); // UART0 Transmit } } //Initialize timer void Timer_Init() { LPC_SC->PCONP |= (1< LPC_TIM0->MCR = (1< LPC_TIM0->PR = getPrescalarForUs0(PCLK_TIMER0); // Prescalar for 1us */ LPC_TIM0->MR0 = MiliToMicroSec(100); // Load timer value to generate 100us delay LPC_TIM0->TCR = (1 < LPC_TIM1->MCR = (1< LPC_TIM1->PR = getPrescalarForUs0(PCLK_TIMER1); /* Prescalar for 1us */ LPC_TIM1->MR0 = MiliToMicroSec(100); /* Load timer value to generate 500ms delay*/ LPC_TIM1->TCR = (1 < } void TIMER0_IRQHandler(void) { unsigned int isrMask; NVIC_DisableIRQ(TIMER0_IRQn); // Disable Timer0 isrMask = LPC_TIM0->IR; LPC_TIM0->IR = isrMask; // Clear the Interrupt Bit LPC_GPIO2->FIOCLR |= (1<<12); // Reset P2.12 } void TIMER1_IRQHandler(void) { unsigned int isrMask; NVIC_DisableIRQ(TIMER1_IRQn); // Disable Timer1 isrMask = LPC_TIM1->IR; LPC_TIM1->IR = isrMask; // Clear the Interrupt Bit LPC_GPIO2->FIOSET |= (1<<12); // Reset P2.12 } int main() { SystemInit(); Pin_Init(); uart_init(115200); // Initialize the UART0 and UART3 Timer_Init(); while(1) { } } 
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人中狼 发表于 2018-5-3 03:18 谢谢你的建议，我检查了一下，UART3确实有问题，现在UART3已经弄好了。但是想请问怎么能实现收到完整的数据包后再转发呢？ 请问你有没有这方面的程序能让我参考一下，谢谢了 |
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2018-5-3 19:36:51
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