AT32 BPR — 入侵检测

Tue, 08 Sep 2026 14:52:21 +0800

BPR — 入侵检测

固件库: AT32F403A_407_Firmware_Library V2.2.2
芯片: AT32
源文件: AT32/AT32F403A_407_Firmware_Library_V2.2.2/project/at_start_f403a/examples/bpr/tamper/src/main.c

功能简介

本示例演示备份寄存器（BPR）的读写。BPR 由独立电池供电，MCU 复位后数据不丢失，适合存储校准参数、运行计数等关键数据。

完整代码

#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"
#define BPR_DR_NUMBER                    42

int main(void)
{
  /* config nvic priority group */
  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);

  system_clock_config();

  at32_board_init();

  /* nvic configuration */
  nvic_irq_enable(TAMPER_IRQn, 0, 0);

  /* enable pwc and bpr clock */
  crm_periph_clock_enable(CRM_PWC_PERIPH_CLOCK, TRUE);
  crm_periph_clock_enable(CRM_BPR_PERIPH_CLOCK, TRUE);

  /* enable write access to bpr domain */
  pwc_battery_powered_domain_access(TRUE);

  /* disable tamper pin */
  bpr_tamper_pin_enable(FALSE);

  /* disable tamper interrupt */
  bpr_interrupt_enable(FALSE);

  /* tamper pin active on low level */
  bpr_tamper_pin_active_level_set(BPR_TAMPER_PIN_ACTIVE_LOW);

  /* clear tamper pin event pending flag */
  bpr_flag_clear(BPR_TAMPER_EVENT_FLAG);

  /* write data to bpr dt registers */
  bpr_reg_write();

  /* enable tamper interrupt */
  bpr_interrupt_enable(TRUE);

  /* enable tamper pin */
  bpr_tamper_pin_enable(TRUE);

  /* check if the written data are correct */
  if(bpr_reg_check() == TRUE)
  {
    at32_led_on(LED2);
  }
  else
  {
    at32_led_off(LED2);
  }

  while(1)
  {
  }
}

代码讲解

系统时钟初始化：配置 MCU 的主频和时钟树。不同芯片的时钟配置不同，一般由工具生成。

板级初始化：初始化开发板上的 LED、按键等基础外设。

中断优先级配置：NVIC 设置中断的抢占优先级和子优先级。数字越小优先级越高。

GD32 BKP — 入侵检测

Tue, 08 Sep 2026 14:52:21 +0800

BKP — 入侵检测

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/BKP/Tamper/main.c

功能简介

本示例演示 BKP 的基本用法。

完整代码

#include "gd32f30x.h"
#include "gd32f307c_eval.h"
#define BKP_DATA_REG_NUM              42

void led_config(void);
void nvic_config(void);
void write_backup_register(uint16_t data);
uint32_t check_backup_register(uint16_t data);
    
/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    /* led configuration and turn on all led */
    led_config();
    /* NVIC configuration */
    nvic_config();
    /* PMU lock enable */
    rcu_periph_clock_enable(RCU_PMU);
    /* BKP clock enable */
    rcu_periph_clock_enable(RCU_BKPI);
    
    /* enable write access to the registers in backup domain */
    pmu_backup_write_enable();
    /* confirm RCU_BDCTL_BKPRST bit is reset */
    if(RESET != (RCU_BDCTL & RCU_BDCTL_BKPRST)){
        rcu_bkp_reset_disable();
    }
    /* tamper pin active level set */
    bkp_tamper_active_level_set(TAMPER_PIN_ACTIVE_LOW);
    /* tamper detection disable  */
    bkp_tamper_detection_disable();
    /* disable the tamper interrupt */
    bkp_tamper_interrupt_disable();
    /* clear the bit flag of tamper event */
    bkp_flag_clear(BKP_FLAG_TAMPER);
    /* configure the tamper pin active on low level, and enable the tamper pin */
    bkp_tamper_interrupt_enable();
    /* tamper detection enable  */
    bkp_tamper_detection_enable();
    /* write data to backup DATAx registers */
    write_backup_register(0x1226);
  
    /* check if the written data are correct */
    if(0x00 == check_backup_register(0x1226)){
        /* turn on LED2 */
        gd_eval_led_on(LED2);
    }else{
        /* turn on LED3 */
        gd_eval_led_on(LED3);
    }
    while(1){
    }
}

void led_config(void)
{
    gd_eval_led_init(LED2);
    gd_eval_led_init(LED3);
    gd_eval_led_init(LED4);
    gd_eval_led_init(LED5);
}

void nvic_config(void)
{
    nvic_irq_enable(TAMPER_IRQn,0,0);
}

代码讲解

中断优先级配置：NVIC 设置中断的抢占优先级和子优先级。数字越小优先级越高。

Tamper on CLing

AT32 BPR — 入侵检测

BPR — 入侵检测

功能简介

完整代码

代码讲解

GD32 BKP — 入侵检测

BKP — 入侵检测

功能简介

完整代码

代码讲解