一.打印复位状态寄存器：R8_RESET_STATUS
该寄存器的低三位对应以下复位原因：
最近一次复位状态：
000：软件复位 SR（RB_WDOG_RST_EN=0 时软件复位可产生此状态，否则可复位 但不产生此状态）；
001：上电复位 RPOR；
010：看门狗超时复位 WTR；
011：外部手动复位 MR；
101：从下电模式唤醒时的复位 GRWSM； 100/110/111：唤醒复位 LRW，且此前的 上一次复位分别是 SR/WTR/MR。
void print_reset_reason(void) {uint8_t rst = R8_RESET_STATUS & 0x07; // 仅取低3位复位标识PRINT("R8_RESET_STATUS=0x%x\n", R8_RESET_STATUS);PRINT("Reset Reason: ");switch (rst) {case 0x00: PRINT("Software Reset (SR)\n"); break;case 0x01: PRINT("Power-On Reset (RPOR)\n"); break;case 0x02: PRINT("Watchdog Reset (WTR)\n"); break;case 0x03: PRINT("Manual Reset (MR)\n"); break;case 0x04: PRINT("Wake-Up Reset (LRW, prev: SR)\n"); break;case 0x05: PRINT("Power-Down Wake-Up (GRWSM)\n"); break;case 0x06: PRINT("Wake-Up Reset (LRW, prev: WTR)\n"); break;case 0x07: PRINT("Wake-Up Reset (LRW, prev: MR)\n"); break;default: PRINT("Unknown (0x%x)\n", rst); break;}
}void main(void) {// 系统初始化（时钟、串口等，按硬件需求添加）print_reset_reason(); // 打印复位原因while (1) {// 业务逻辑// ...}二.添加打印查看Hardfault
__attribute__((section(".highcode"))) //put in ram __attribute__((interrupt("WCH-Interrupt-fast"))) //disable soft push/pull void HardFault_Handler(void) {uint32_t v_mepc,v_mcause,v_mtval;PRINT("hardfault\n"); v_mepc=__get_MEPC();v_mcause=__get_MCAUSE();v_mtval=__get_MTVAL(); PRINT("mepc:%08x\n",v_mepc);PRINT("mcause:%08x\n",v_mcause);PRINT("mtval:%08x\n",v_mtval);while(1); }
mepc可以在list文件中查看，
mause：
| Interrupt | Exception Code | Description |
|---|---|---|
| 1 | 0 | User software interrupt |
| 1 | 1 | Supervisor software interrupt |
| 1 | 2 | Hypervisor software interrupt |
| 1 | 3 | Machine software interrupt |
| 1 | 4 | User timer interrupt |
| 1 | 5 | Supervisor timer interrupt |
| 1 | 6 | Hypervisor timer interrupt |
| 1 | 7 | Machine timer interrupt |
| 1 | 8 | User external interrupt |
| 1 | 9 | Supervisor external interrupt |
| 1 | 10 | Hypervisor external interrupt |
| 1 | 11 | Machine external interrupt |
| 1 | ≥12 | Reserved |
| 0 | 0 | Instruction address misaligned |
| 0 | 1 | Instruction access fault |
| 0 | 2 | Illegal instruction |
| 0 | 3 | Breakpoint |
| 0 | 4 | Load address misaligned |
| 0 | 5 | Load access fault |
| 0 | 6 | Store/AMO address misaligned |
| 0 | 7 | Store/AMO access fault |
| 0 | 8 | Environment call from U-mode |
| 0 | 9 | Environment call from S-mode |
| 0 | 10 | Environment call from H-mode |
| 0 | 11 | Environment call from M-mode |
| 0 | ≥12 | Reserved |
