stm32f407与openmv串口通信
时间: 2023-07-31 19:04:14 浏览: 84
STM32F407和OpenMV可以通过串口进行通信。首先需要确定两个设备之间的串口通信参数,例如波特率、数据位、停止位和校验位等。然后在STM32F407和OpenMV上分别编写串口通信的代码,通过串口发送和接收数据。在STM32F407上可以使用HAL库或者标准库进行串口编程,而OpenMV则可以使用MicroPython语言进行编程。最后,通过串口调试助手等工具可以验证通信是否成功。
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stm32f407与openmv串口通信代码
以下是使用STM32F407与OpenMV进行串口通信的示例代码:
首先,需要在STM32F407的代码中初始化串口,并且设置波特率、数据位、停止位和奇偶校验位等参数。例如:
```c
/* 初始化串口 */
void UART_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
USART_InitTypeDef UART_InitStruct = {0};
/* 使能串口和GPIO时钟 */
__HAL_RCC_USART1_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/* 配置TX引脚为复用推挽输出 */
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* 配置RX引脚为浮空输入 */
GPIO_InitStruct.Pin = GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* 配置串口参数 */
UART_InitStruct.BaudRate = 115200;
UART_InitStruct.WordLength = UART_WORDLENGTH_8B;
UART_InitStruct.StopBits = UART_STOPBITS_1;
UART_InitStruct.Parity = UART_PARITY_NONE;
UART_InitStruct.Mode = UART_MODE_TX_RX;
UART_InitStruct.HwFlowCtl = UART_HWCONTROL_NONE;
UART_InitStruct.OverSampling = UART_OVERSAMPLING_16;
HAL_UART_Init(&huart1, &UART_InitStruct);
}
```
然后,需要在STM32F407的代码中使用HAL库函数读取OpenMV发送的数据。例如:
```c
/* 读取OpenMV发送的数据 */
void Read_OpenMV_Data(void)
{
uint8_t buf[10] = {0};
HAL_UART_Receive(&huart1, buf, 10, 1000);
/* 处理接收到的数据 */
// TODO
}
```
在OpenMV的代码中,需要使用`uart`模块初始化串口,并且设置波特率、数据位、停止位和奇偶校验位等参数。例如:
```python
import time
from pyb import UART
# 初始化串口
uart = UART(3, 115200, timeout_char=1000)
uart.init(115200, bits=8, parity=None, stop=1)
while True:
# 发送数据
uart.write('Hello, STM32F407!')
# 接收数据
data = uart.read(10)
if data is not None:
print('Received:', data)
time.sleep(1)
```
这样,STM32F407和OpenMV之间就可以进行串口通信了。
stm32f407与openmv串口通信代码标准库函数版本
以下是使用标准库函数的stm32f407与openmv串口通信代码示例:
```c
#include "stm32f4xx.h"
#include <stdio.h>
#define USARTx USART2
#define USARTx_CLK RCC_APB1Periph_USART2
#define USARTx_TX_PIN GPIO_Pin_2
#define USARTx_TX_GPIO_PORT GPIOA
#define USARTx_TX_GPIO_CLK RCC_AHB1Periph_GPIOA
#define USARTx_TX_SOURCE GPIO_PinSource2
#define USARTx_TX_AF GPIO_AF_USART2
#define USARTx_RX_PIN GPIO_Pin_3
#define USARTx_RX_GPIO_PORT GPIOA
#define USARTx_RX_GPIO_CLK RCC_AHB1Periph_GPIOA
#define USARTx_RX_SOURCE GPIO_PinSource3
#define USARTx_RX_AF GPIO_AF_USART2
#define USARTx_IRQn USART2_IRQn
void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIO clock */
RCC_AHB1PeriphClockCmd(USARTx_TX_GPIO_CLK | USARTx_RX_GPIO_CLK, ENABLE);
/* Enable USART clock */
RCC_APB1PeriphClockCmd(USARTx_CLK, ENABLE);
/* Connect PXx to USARTx_Tx */
GPIO_PinAFConfig(USARTx_TX_GPIO_PORT, USARTx_TX_SOURCE, USARTx_TX_AF);
/* Connect PXx to USARTx_Rx */
GPIO_PinAFConfig(USARTx_RX_GPIO_PORT, USARTx_RX_SOURCE, USARTx_RX_AF);
/* Configure USART Tx and Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = USARTx_TX_PIN;
GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = USARTx_RX_PIN;
GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStructure);
/* USART configuration */
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(USARTx, &USART_InitStructure);
/* Enable USART */
USART_Cmd(USARTx, ENABLE);
/* Configure USART interrupt */
USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int fputc(int ch, FILE *f)
{
/* Send a character to the USARTx */
USART_SendData(USARTx, (uint8_t) ch);
/* Loop until the end of transmission */
while (USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET);
return ch;
}
void USARTx_IRQHandler(void)
{
if (USART_GetITStatus(USARTx, USART_IT_RXNE) != RESET)
{
char rx_data = USART_ReceiveData(USARTx);
printf("Received: %c\n", rx_data);
USART_ClearITPendingBit(USARTx, USART_IT_RXNE);
}
}
int main(void)
{
USART_Config();
while (1)
{
/* Send data to OpenMV */
printf("Hello OpenMV!\n");
delay_ms(1000);
}
}
```
在此示例中,我们使用USART2与OpenMV进行通信。我们使用标准库函数进行USART2的初始化,并在中断处理程序中接收OpenMV发送的数据并打印到终端。在主函数中,我们使用printf函数向OpenMV发送数据。