Stm32 IAP 升级

1.bootloader 相当于极简化的uboot
2.app

明确升级文件的crc校验和传输次数,简单的升级结构

import serial, time
import ctypesclass IAP_H(ctypes.Structure):_pack_ = 1_fields_ = [("magic", ctypes.c_uint32),("filename", ctypes.c_char * 16),("size", ctypes.c_uint32),("chunk_counts", ctypes.c_uint32),("crc", ctypes.c_uint16),]def view_iap(buffer: bytearray) -> IAP_H:if len(buffer) < ctypes.sizeof(IAP_H):raise ValueError("")return IAP_H.from_buffer(buffer)hdr = IAP_H(0x11223344, b"app.bin", 123456, 10, 0xBEEF)
raw = bytes(bytearray(ctypes.string_at(ctypes.addressof(hdr), ctypes.sizeof(hdr))))
ser = serial.Serial("COM3", 115200, bytesize=8, parity="N", stopbits=1, timeout=0.1)
count = 1
while True:time.sleep(0.1)if count == 1:ser.write(raw)count = 0time.sleep(0.2)print(ser.readline()

我是用的时固定的字节数中断传输,命令阶段固定30字,传输阶段跳到1K,在每个chunk 加入灯闪