[问答]

F103求助USART3无法工作，MDK仿真能够输出，但板子不能打印

问答对人有帮助，内容完整，我也想知道答案 0 代码如下：那位大神指点一下啊~ #include "STM32f10x.h" #include "stdio.h" void delay(__IO u32 nCount); int main(void) { /* USART1 config 115200 8-N-1 / USART3_Config(); printf("rn STM32f103 USART1 test"); //USART3_Config(); while(1) { printf("rn TM32f103 USART3 test rn"); // for (;;) { //} } } void delay(__IO u32 nCount) { for (; nCount != 0; nCount--); } void USART3_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; / config USART3 clock / RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3 \| RCC_APB2Periph_GPIOB, ENABLE); / USART3 GPIO config / / Configure USART3 Tx (PB.10) as alternate function push-pull / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); / Configure USART3 Rx (PB.11) as input floating / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure); / USART3 mode config / USART_InitStructure.USART_BaudRate = 115200; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No ; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; USART_Init(USART3, &USART_InitStructure); / Ê¹ÄÜ´®¿Ú3½ÓÊÕÖÐ¶Ï / USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); USART_Cmd(USART3, ENABLE); } //ÅäÖÃUSART3½ÓÊÕÖÐ¶Ï void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; / Configure the NVIC Preemption Priority Bits / NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3); / Enable the USARTy Interrupt / NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void NVIC_Init(NVIC_InitTypeDef NVIC_InitStruct) { uint32_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F; /* Check the parameters / assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd)); assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority)); assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority)); if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE) { / Compute the Corresponding IRQ Priority --------------------------------/ tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08; tmppre = (0x4 - tmppriority); tmpsub = tmpsub >> tmppriority; tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre; tmppriority \|= NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub; tmppriority = tmppriority << 0x04; NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority; / Enable the Selected IRQ Channels --------------------------------------/ NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] = (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F); } else { / Disable the Selected IRQ Channels -------------------------------------/ NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] = (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F); } } #define AIRCR_VECTKEY_MASK ((uint32_t)0x05FA0000) void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup) { / Check the parameters / assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup)); / Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value / SCB->AIRCR = AIRCR_VECTKEY_MASK \| NVIC_PriorityGroup; } /// ÖØ¶¨Ïòc¿âº¯Êýprintfµ½USART3 int fputc(int ch, FILE f) { /* ·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ýµ½USART3 / USART_SendData(USART3, (uint8_t) ch); / µÈ´ý·¢ËÍÍê±Ï / while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET); return (ch); } /// ÖØ¶¨Ïòc¿âº¯Êýscanfµ½USART3 int fgetc(FILE f) { /* µÈ´ý´®¿Ú1ÊäÈëÊý¾Ý / while (USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET); return (int)USART_ReceiveData(USART3); } /******************************************END OF FILE********************/ 0
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