涂鸦智能颈部按摩仪设计——档位切换实现（嵌入式）

Posted 2021-07-19 三明治开发社区

1、档位实现原理

按摩仪共设置15个档位，可以控制按摩的力度，通过BOOST升压电路实现。

通过P8口产生PWM波，调节PWM输出的正占空比来实现升压，详细的硬件原理可参考硬件部分关于升压原理的介绍，具体数值如下：

档位	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	最大档
升压值(V)	12	15	19	22	26	29	33	36	40	43	47	50	54	57	60	60
占空比(%)	1	2	4	6	7	9	12	16	18	22	24	26	30	34	36	36

档位调节是通过按键的单击和双击来实现的，单击档位加，双击档位减。由于SDK配置原因，在程序烧录后复位模组时P8口已经被拉高，所以在此处对其做拉低处理。

void boost_init(void)
{
    gpio_set_func(BOOST_PIN, AS_PWM0);
    gpio_set_output_en(BOOST_PIN, 1);
	//PWM0 1ms cycle
	pwm_set_mode(PWM0_ID, PWM_NORMAL_MODE);
	pwm_set_clk(CLOCK_SYS_CLOCK_HZ, BOOST_PWM_CLOCK_HZ); //设定BOOST升压时PWM频率为 16M / (968-1) ≈ 16.55KHz
	pwm_set_phase(PWM0_ID, 0);   //no phase at pwm beginning
	pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (0 * CLOCK_SYS_CLOCK_1US) );
	pwm_start(PWM0_ID);
}

2、实现过程

初始化完成后通过输入参数的具体值改变占空比升压到对应值。

void switching_gear(unsigned char gears)
{
	if (gears > 15) {
		TUYA_APP_LOG_ERROR("*********There is no such gear!!!**********");
	}

	switch (gears) {
	case first_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (10 * CLOCK_SYS_CLOCK_1US) );

		break;
	case second_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (20 * CLOCK_SYS_CLOCK_1US) );

		break;
	case third_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (40 * CLOCK_SYS_CLOCK_1US) );

		break;
	case fourth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (60 * CLOCK_SYS_CLOCK_1US) );

		break;
	case fifth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (70 * CLOCK_SYS_CLOCK_1US) );

		break;
	case sixth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (90 * CLOCK_SYS_CLOCK_1US) );

		break;
	case seventh_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (120 * CLOCK_SYS_CLOCK_1US) );

		break;
	case eighth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (160 * CLOCK_SYS_CLOCK_1US) );

		break;
	case ninth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (180 * CLOCK_SYS_CLOCK_1US) );

		break;
	case tenth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (220 * CLOCK_SYS_CLOCK_1US) );

		break;
	case eleventh_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (240 * CLOCK_SYS_CLOCK_1US) );

		break;
	case twelfth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (260 * CLOCK_SYS_CLOCK_1US) );

		break;
	case thirteenth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (300 * CLOCK_SYS_CLOCK_1US) );

		break;
	case fourteenth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (340 * CLOCK_SYS_CLOCK_1US) );

		break;
	case fifteenth_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (360 * CLOCK_SYS_CLOCK_1US) );

		break;
	case max_gear:
		pwm_set_cycle_and_duty(PWM0_ID, (u16) (1000 * CLOCK_SYS_CLOCK_1US),  (u16) (360 * CLOCK_SYS_CLOCK_1US) );

		break;
	default:
		break;
	}
}