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参考下freertos中有个cmtrace模块，好像是这个名字
【 在 wjhtingerx (ca6140) 的大作中提到: 】
: 发信人: wjhtingerx (ca6140), 信区: CProgramming
: 标  题: ARM M4异常处理中打印寄存器，求方案
: 发信站: 水木社区 (Wed Jul  3 11:46:16 2019), 站内
: ...................
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FROM 183.209.152.*

int32_t debug_vprint(int32_t lvl, const char *format, va_list arg_list)
{
    if (debug_buffer == NULL) {
        return -1;
    }

    if (lvl == ECLOG_EMERG) {
        // In emergency mode, global interrupt should be disabled.
        int cnt = vsprintf(debug_buffer, format, arg_list);
        for (int32_t i = 0; i < cnt; i++) {
            while ((DEBUG_UART_HANDLE->SR & (0x1 << 7)) == 0) {
            }
            DEBUG_UART_HANDLE->DR = debug_buffer[i];
        }
        return cnt;
    }
    else if (lvl <= debug_lvl) {
        int32_t ret = ec_vfprintf(debug_fd, format, arg_list);
        return ret;
    }
    else {
        return 0;
    }
}

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FROM 111.198.57.*