一线通协议解析

简单列举一下电动车的一线通协议解析代码，自己记录用

/**
 * @brief : 一线通初始化内部函数
 *
 * @return vd_bool_t
 */
vd_bool_t isdn_inside_init(void) {
    drv_gpio_t drv_gpio;
    drv_gpio.pin  = PLATFORM_ISDN_PIN;
    drv_gpio.mode = DRV_GPIO_MODE_INPUT;
    drv_gpio.pull = DRV_GPIO_NOPULL;
    drv_gpio_init(&drv_gpio);
		drv_gpio_requst_irq(drv_gpio.pin, DRV_GPIO_MODE_EXTI_IT_RISING, isdn_pin_isr);
		printf("isdn_init_successful\r");
    return vd_true;
}

/**
 * @brief : 一线通中断处理函数
 *
 * @param pin:中断引脚
 * @param value:引脚电平
 * @return vd_void_t
 */
static vd_void_t isdn_pin_isr(vd_uint8_t pin, vd_uint8_t value) {
    if (value == 1) {
        t1_time = drv_systick_get();                                          //触发高电平时刻
        drv_gpio_irq_mode(PLATFORM_ISDN_PIN, DRV_GPIO_MODE_EXTI_IT_FALLING);  //高电平配置下降沿触发
        if ((t1_time - t2_time >= 10000) && start_signal == 0) {
            start_signal = 2;  //起始信号
        } else if (t2_time != 0 && start_signal == 1) {
            low_time = t1_time - t2_time;  //低电平持续时间
						
        }
    } else {
        t2_time = drv_systick_get();                                         //触发低电平时刻
        drv_gpio_irq_mode(PLATFORM_ISDN_PIN, DRV_GPIO_MODE_EXTI_IT_RISING);  //低电平配置上升沿触发
        if (t1_time != 0 && start_signal == 1) {
            high_time = t2_time - t1_time;  //高电平持续时间
        } else if (t1_time != 0 && start_signal == 2) {
            start_signal = 1;          //开始接收数据
            high_time = low_time = 0;  //高低电平持续时间清空
        }
    }
    if (high_time != NULL && low_time != NULL && start_signal == 1) {
        high_or_low = (low_time > high_time) ? LOW : HIGH;  //高低电平时间比例
        drv_isdn_interaction(high_or_low);                  //字节组合函数
        high_time = low_time = 0;                           //时间清空}
       
    }
}


/**
 * @brief : 字节组合函数
 *
 * @param bit_value: 传入的位数
 * @return vd_bool_t
 */
static vd_bool_t drv_isdn_interaction(vd_uint8_t bit_value) {
    vd_uint8_t byte_bit;
    byte_bit = bit_value;
    // isdn_sum[bit_num] = bit_value; //存入bit
    byte |= byte_bit << (7 - bit_num);
    bit_num++;
    if (bit_num == 8) {
        bit_num = 0;  //位数清零
		log_debug("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r");
		log_debug("receive byte : %d\n",byte);
        isdn_sum[byte_num] = byte;                      //存入字节
        byte = 0;                                       //字节清零
        byte_num++;                                     //字节数+1
        if (byte_num /12 == 1) {
            start_signal = 0;  //起始信号清除
						protocol_push_queue(PLATFORM_ISDN0, isdn_sum, 12);  //往队列里面丢数据
						memset(&isdn_sum,0,12);
            byte_num     = 0;
        }
    }
    return vd_true;
}