写flash 后读 flash 导致 bus fault

[iysheng]

自己写的写 flash 函数，单次写 256 Bytes，循环写 flash 后再读 flash,容易导致如下错误

psr: 0x01000000
[22:12:35.756] r00: 0x20010ec4
[22:12:35.759] r01: 0x20010ec8
[22:12:35.759] r02: 0x02150100
[22:12:35.762] r03: 0x20010ec4
[22:12:35.762] r04: 0x0200ac05
[22:12:35.765] r05: 0xdeadbeef
[22:12:35.765] r06: 0xdeadbeef
[22:12:35.768] r07: 0x20010e38
[22:12:35.768] r08: 0xdeadbeef
[22:12:35.771] r09: 0xdeadbeef
[22:12:35.771] r10: 0xdeadbeef
[22:12:35.774] r11: 0xdeadbeef
[22:12:35.774] r12: 0x0000000a
[22:12:35.777]  lr: 0x02004101
[22:12:35.777]  pc: 0x02008280
[22:12:35.780] hard fault on thread: main

[22:12:35.780] bus fault:
[22:12:35.783] SCB_CFSR_BFSR:0x82 PRECISERR SCB->BFAR:02150100

但是我如果在写之后，添加一定的延时，比如 1ms （实测过），就可以正常运行。请问可能是什么原因？