stm32 串口IAP代码
时间: 2023-08-12 17:03:59 浏览: 179
以下是基于STM32的串口IAP(In-Application Programming)代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include "stm32f10x.h"
#define IAP_START_ADDRESS 0x08004000
void SystemInit(void);
void USART1_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitTypeDef USART_InitStructure;
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(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void USART1_SendChar(char ch)
{
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, ch);
}
int USART1_GetChar(void)
{
if (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
return -1;
else
return USART_ReceiveData(USART1);
}
void USART1_SendString(char *str)
{
while (*str)
USART1_SendChar(*str++);
}
void USART1_ReceiveString(char *str, int max_len)
{
int i;
for (i = 0; i < max_len - 1; i++) {
int ch = USART1_GetChar();
if (ch == -1 || ch == '\n' || ch == '\r')
break;
*str++ = ch;
}
*str = '\0';
}
void USART1_SendHex(uint32_t val)
{
char str[9];
sprintf(str, "%08lx", val);
USART1_SendString(str);
}
int main(void)
{
SystemInit();
USART1_Init();
USART1_SendString("Enter IAP mode? (y/n)\r\n");
char ch;
while (1) {
ch = USART1_GetChar();
if (ch == 'y' || ch == 'Y') {
USART1_SendString("Entering IAP mode...\r\n");
break;
} else if (ch == 'n' || ch == 'N') {
USART1_SendString("Not entering IAP mode\r\n");
return 0;
}
}
USART1_SendString("Erasing flash...\r\n");
FLASH_Unlock();
FLASH_ErasePage(IAP_START_ADDRESS);
FLASH_Lock();
USART1_SendString("Ready to receive data...\r\n");
uint8_t buf[1024];
uint32_t addr = IAP_START_ADDRESS;
int i;
while (1) {
for (i = 0; i < 1024; i++) {
int ch = USART1_GetChar();
if (ch == -1)
break;
buf[i] = ch;
}
if (i == 0)
break;
USART1_SendString("Writing data to flash...\r\n");
FLASH_Unlock();
for (i = 0; i < 1024; i += 2) {
uint16_t val = (buf[i] << 8) | buf[i + 1];
FLASH_ProgramHalfWord(addr + i, val);
}
FLASH_Lock();
USART1_SendString("Data written to flash:\r\n");
USART1_SendHex(addr);
USART1_SendString(" - ");
USART1_SendHex(addr + 1023);
USART1_SendString("\r\n");
addr += 1024;
}
USART1_SendString("IAP complete\r\n");
// Jump to application
void (*app_entry)(void) = (void (*)(void))IAP_START_ADDRESS;
app_entry();
return 0;
}
void SystemInit(void)
{
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
if (RCC_WaitForHSEStartUp() == ERROR) {
while (1);
}
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
FLASH_SetLatency(FLASH_Latency_2);
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while (RCC_GetSYSCLKSource() != 0x08);
}
```
该代码通过串口与计算机进行通信,实现从计算机接收数据并写入STM32的Flash中。使用该代码时,需要在计算机端发送二进制数据,以便在STM32中进行写入。例如,可以使用Python的Serial模块在计算机上实现串口通信:
```python
import serial
ser = serial.Serial('/dev/ttyUSB0', 115200)
if input('Enter IAP mode? (y/n) ') in 'yY':
ser.write(b'\n')
while True:
data = input('Data (hex): ')
if not data:
break
data = bytes.fromhex(data)
ser.write(data)
ser.write(b'\n')
else:
ser.close()
```
该代码通过串口发送数据给STM32,不断等待STM32的响应。在STM32上,如果收到'y'或'Y',则开始IAP过程,如果收到'n'或'N',则退出程序。在进入IAP模式后,STM32将擦除Flash,然后等待计算机发送二进制数据。在STM32收到数据后,将数据写入Flash中,并在串口上发送反馈信息。当计算机不再发送数据时,STM32将完成IAP过程并跳转到应用程序入口点。
阅读全文