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有谁弄成功的吗？我试了串口1没反应，串口2，3都是乱码，只显示一个 “帱” 字，不解，STM32F103都正常，说明软件设置什么的没有问题，硬件也没有问题
void USART2_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; /* Enable GPIO clock */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* Enable UART clock */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
/* Connect PXx to USARTx_Tx*/ GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_USART3);
/* Connect PXx to USARTx_Rx*/ GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_USART3);
/* Configure USART Tx as alternate function */ GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART Rx as alternate function */ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIOC, &GPIO_InitStructure); /* USART configuration */ USART_InitStructure.USART_BaudRate = 2400; 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); /* Enable USART */ USART_Cmd(USART3, ENABLE); }
void USART2_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; /* Enable GPIO clock */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* Enable UART clock */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
/* Connect PXx to USARTx_Tx*/ GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_USART3);
/* Connect PXx to USARTx_Rx*/ GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_USART3);
/* Configure USART Tx as alternate function */ GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART Rx as alternate function */ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIOC, &GPIO_InitStructure); /* USART configuration */ USART_InitStructure.USART_BaudRate = 2400; 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); /* Enable USART */ USART_Cmd(USART3, ENABLE); }
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回复【11楼】tanghong668:
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果然是这里出了问题，谢谢两位，呵呵，现在不乱码了
举例
程序从串口输出：
USART_Send(USART1, "ABCDEF");
USART_Send(USART1, "123456");
接收到正确数据应该为：
41 42 43 44 45 46 31 32 33 34 35 36
计算机串口接收到数据【十六进制】
81 82 83 84 85 86 71 72 73 74 75 76 [看似差了0x40]
很奇怪有没有，想不出原因。。。
USART_Send()函数实现
void USART_Send(USART_TypeDef *USARTx, char *str)
{
uint16_t ch;
while (*str)
{
ch = *str++;
USART_SendData(USARTx, ch);
while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
}
}
如果将其修改为
void USART_Send(USART_TypeDef *USARTx, char *str)
{
uint16_t ch;
while (*str)
{
ch = *str++;
USART_SendData(USARTx, ch - 0x40); //此处有修改，减去0x40
while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
}
}
计算机串口接收到数据为
01 02 03 04 05 06 F1 F2 F3 F4 F5 F6
#if !defined (HSE_VALUE)
#define HSE_VALUE ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */
#endif /* HSE_VALUE */
这一段的外晶振设置也已经改为板载晶振
这很诡异，有没有
求高手解惑
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为什么要配置这个时钟呢，我对比了一下103的stm32f4xx_conf.h中的配置，103就不需要配置这个时钟，为什么
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