6502_a.s是armcc编译出来的，用于对比调试
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下载程序 pyocd flash -t stm32f429xi output/stm32.elf 使用pyocd调试： 1. 启动pyocd pyocd gdbserver -t stm32f429xi 2. 启动gdb arm-none-eabi-gdb -ex "target remote localhost:3333" 使用openocd下载程序 openocd -f interface/cmsis-dap.cfg -f target/stm32f4x.cfg -c "init; halt; flash write_image erase output/stm32.bin 0x08000000 bin; reset; shutdown"
