CH5xx BLE芯片复位排查方法

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