BKP — 备份数据读写

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

void led_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();
    /* 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();
    }
    /* clear the bit flag of tamper event */
    bkp_flag_clear(BKP_FLAG_TAMPER);
    
    /* check if the POR/PDR reset flag is set */
    if(RESET != rcu_flag_get(RCU_FLAG_PORRST)){
        /* clear the RCU all reset flags */
        rcu_all_reset_flag_clear();
        /* turn on LED4 */
        gd_eval_led_on(LED4);
        
        /* check if backup data registers has been written */
        if(0x00 == check_backup_register(0x1226)){
            /* Backup data registers values are correct */
            /* turn on LED2 */
            gd_eval_led_on(LED2);
        }else{
            /* backup data registers values are not correct or they are not written*/
            /* write data to backup data registers */
            write_backup_register(0x1226);
            /* turn on LED3 */
            gd_eval_led_on(LED3);
        }
    }
    /* turn on LED5 */
    gd_eval_led_on(LED5);;
    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);
}