//Usart3 NVIC 配置 NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;//抢占优先级0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
时间: 2024-01-24 09:18:31 浏览: 25
这段代码是在进行USART3的NVIC配置,其中NVIC_InitStructure是一个NVIC_InitTypeDef类型的结构体,用于存储NVIC相关的配置信息。具体来说,该代码将USART3的中断通道号设置为USART3_IRQn,并将抢占优先级和子优先级都设置为0,表示最高优先级。然后通过将NVIC_IRQChannelCmd设置为ENABLE来使能该中断通道,最后调用NVIC_Init函数来将配置信息写入VIC寄存器中,完成NVIC的配置。
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好的,谢谢。void uart6_init(void) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; // 已修正 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; USART_InitTypeDef USART_InitStructure; USART_InitStructure.USART_BaudRate = 115200; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // 已修正 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; // 已修正 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; GPIO_Init(GPIOA, &GPIO_InitStructure); NVIC_Init(&NVIC_InitStructure); USART_Init(USART1, &USART_InitStructure); // 已修正 USART_Cmd(USART1, ENABLE); } void USART1_IRQHandler(void) // 已修正 { if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET) { // 处理接收数据的代码 } USART_ClearITPendingBit(USART1, USART_IT_RXNE); }
这段代码存在一个错误:
1. 在初始化 USART 时,使用了不正确的 USART 模块。应该将 `USART1` 改为 `USART2`,因为我们要初始化的是 USART2 模块。
修正后的代码如下:
```c
void uart6_init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
GPIO_Init(GPIOA, &GPIO_InitStructure);
NVIC_Init(&NVIC_InitStructure);
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
}
void USART2_IRQHandler(void)
{
if (USART_GetITStatus(USART2, USART_IT_RXNE) == SET)
{
// 处理接收数据的代码
}
USART_ClearITPendingBit(USART2, USART_IT_RXNE);
}
```
这段代码初始化了 STM32 单片机的 USART2 模块,并添加了接收数据的中断处理函数。
对下面的的这一串代码进行检错,并告知我这是对STM32单片机哪个模块的初始化“int main(void) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART2,ENABLE); RCC_AHBPeriphResetCmd(RCC_APB2Periph_GPIOA,ENABLE); GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA,&GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 5200; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_Mode = USART_Mode_Rx|USART_Mode_Tx; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_Init(USART1,&USART_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_Init(&NVIC_InitStructure); }”
这段代码存在几个错误:
1. 在初始化时,使用了不正确的宏定义。函数 `RCC_APB2PeriphClockCmd()` 和 `RCC_AHBPeriphResetCmd()` 应该分别使用 `RCC_APB2PeriphClockCmd()` 和 `RCC_AHBPeriphClockCmd()` 来初始化 USART2 和 GPIOA 模块。
2. 在初始化 GPIO 时,使用了不正确的 GPIO 引脚。GPIO_Pin_10 应该改为 GPIO_Pin_2,因为 USART2 的引脚为 PA2。
3. 在初始化 USART 时,使用了不正确的 USART 模块。应该将 `USART1` 改为 `USART2`,因为我们要初始化的是 USART2 模块。
最后,缺少返回值 `return 0;`。完整的代码如下:
```c
int main(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART2, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; // 已修正
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 5200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_Init(USART2, &USART_InitStructure); // 已修正
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_Init(&NVIC_InitStructure);
return 0; // 添加了返回值
}
```
这段代码初始化了 STM32 单片机的 USART2 模块。