【GD32L233C-START评测】四、定时器PWM应用之驱动RGB灯

dql2016

【GD32L233C-START评测】四、定时器PWM应用之驱动RGB灯 [复制链接]

定时器PWM是MCU最常用的外设之一，GD32L233C具有多个定时器和PWM输出通道，定时器资源如下所示：

通过管脚复用可以知道哪些IO具有PWM功能：

GD32L233C-START开发板说是兼容arduino uno接口（arduino uno接口的好处不就是有大量arduino生态的扩展板能够即插即用嘛），但是并没有完全支持，只能说这个开发板设计的很水，GD32L233C能输出PWM的IO远多于6个，可是在开发板上并没有按照arduino uno接口的标准将具有PWM功能的IO连接到D3、D5、D6、D9、D10、D11。。。只支持了D3、D9、D11。。。这意味着当arduino扩展板需要3路以上PWM控制信号时，无法即插即用。

此外，串口有好几个，没有必要将开发板上的USB调试串口和arduino uno接口的D0、D1复用。

标准arduino uno r3接口：

为了测试PWM功能，使用涂鸦的兼容arduino uno r3的RGB扩展板：

RGB扩展板插在GD32L233C-START上的效果

根据GD32L233C-START开发板的原理图，能够使用PWM的只有PB15、PB0、PB5，遗憾：

涂鸦三明治（PWM）照明功能板是一款支持彩灯五路调光的 LED 控制器。照明功能板（PWM）可实现五路照明功能，带有暖光，冷白及 RGB 灯珠和相应的控制芯片。

冷白，暖白控制采用 SLM211A DC-DC 降压型 PWM 线性恒流调光控制芯片。
RGB 控制采用 BP168CJ DC-DC 降压型 PWM 线性恒流控制芯片。

I/O	说明
PWMC	冷白 PWM 控制信号，高电平有效
PWMW	暖白 PWM 控制信号，高电平有效
PWMR	RGB 红光控制信号，高电平有效
PWMG	RGB 绿光控制信号，高电平有效
PWMB	RGB 蓝光控制信号，高电平有效

3个控制管脚对应的定时器和PWM通道如下：

PB15 --- timer11-ch1 pwmR
PB5 --- timer2-ch1 pwmB
PB0 --- timer2-ch2 pwmW

gd32的API设计相比stm32用起来要舒服的多，很简洁，易于使用：

main.c测试代码

婵犮垼娉涚粔鎾春閿燂拷

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#include "gd32l23x.h"
#include "systick.h"

// PB15 --- timer11-ch1 pwmR
// PB5  --- timer2-ch1  pwmB
// PB0  --- timer2-ch2  pwmW

void gpio_config(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);
    /* TIMER2 & TIMER11 GPIO */
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_0 | GPIO_PIN_5 | GPIO_PIN_15);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0 | GPIO_PIN_5 | GPIO_PIN_15);
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_0);
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_5);
	  gpio_af_set(GPIOB, GPIO_AF_2, GPIO_PIN_15);
}

void timer2_config(void)
{
    timer_oc_parameter_struct timer_ocinitpara;
    timer_parameter_struct timer_initpara;

    /* enable the peripherals clock */
    rcu_periph_clock_enable(RCU_TIMER2);

    /* deinit a TIMER */
    timer_deinit(TIMER2);
    /* initialize TIMER init parameter struct */
    timer_struct_para_init(&timer_initpara);
    /* TIMER2 configuration */
    timer_initpara.prescaler        = 63;
    timer_initpara.alignedmode      = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection = TIMER_COUNTER_UP;
    timer_initpara.period           = 9999;
    timer_initpara.clockdivision    = TIMER_CKDIV_DIV1;
    timer_init(TIMER2, &timer_initpara);

    /* initialize TIMER channel output parameter struct */
    timer_channel_output_struct_para_init(&timer_ocinitpara);
    /* configure TIMER channel output function */
    timer_ocinitpara.outputstate    = TIMER_CCX_ENABLE;
    timer_ocinitpara.ocpolarity     = TIMER_OC_POLARITY_HIGH;
    timer_channel_output_config(TIMER2, TIMER_CH_1, &timer_ocinitpara);
    timer_channel_output_config(TIMER2, TIMER_CH_2, &timer_ocinitpara);

    timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_1, 0);
    timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_2, 0);

    /* CH0 configuration in OC timing mode */
    timer_channel_output_mode_config(TIMER2, TIMER_CH_1, TIMER_OC_MODE_PWM0);
    timer_channel_output_mode_config(TIMER2, TIMER_CH_2, TIMER_OC_MODE_PWM0);
}


void timer11_config(void)
{
    timer_oc_parameter_struct timer_ocinitpara;
    timer_parameter_struct timer_initpara;

    /* enable the peripherals clock */
    rcu_periph_clock_enable(RCU_TIMER11);

    /* deinit a TIMER */
    timer_deinit(TIMER11);
    /* initialize TIMER init parameter struct */
    timer_struct_para_init(&timer_initpara);
    /* TIMER2 configuration */
    timer_initpara.prescaler        = 63;
    timer_initpara.alignedmode      = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection = TIMER_COUNTER_UP;
    timer_initpara.period           = 9999;
    timer_initpara.clockdivision    = TIMER_CKDIV_DIV2;
    timer_init(TIMER11, &timer_initpara);

    /* initialize TIMER channel output parameter struct */
    timer_channel_output_struct_para_init(&timer_ocinitpara);
    /* configure TIMER channel output function */
    timer_ocinitpara.outputstate    = TIMER_CCX_ENABLE;
    timer_ocinitpara.ocpolarity     = TIMER_OC_POLARITY_HIGH;
    timer_channel_output_config(TIMER11, TIMER_CH_1, &timer_ocinitpara);

    timer_channel_output_pulse_value_config(TIMER11, TIMER_CH_1, 0);

    /* CH0 configuration in OC timing mode */
    timer_channel_output_mode_config(TIMER11, TIMER_CH_1, TIMER_OC_MODE_PWM0);
}

int main(void)
{
	systick_config();
  gpio_config();
  timer2_config();
	timer11_config();
	
	while(1)
	{
        /* enable a TIMER */
		timer_enable(TIMER11);
		//pwmR test
		for(int i =0;i<1000;i++)
		{
			delay_1ms(2);
			timer_channel_output_pulse_value_config(TIMER11, TIMER_CH_1, i*10);
		}
		for(int i =999;i>0;i--)
		{
			delay_1ms(2);
			timer_channel_output_pulse_value_config(TIMER11, TIMER_CH_1, i*10);
		}
		timer_channel_output_pulse_value_config(TIMER11, TIMER_CH_1, 0);
		timer_disable(TIMER11);
		//pwmR end
		
		timer_enable(TIMER2);
		//pwmB test
		for(int i =0;i<1000;i++)
		{
			delay_1ms(2);
			timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_1, i*10);
		}
		for(int i =999;i>0;i--)
		{
			delay_1ms(2);
			timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_1, i*10);
		}
		timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_1, 0);
		//pwmB end
		
		//pwmW test
		for(int i =0;i<1000;i++)
		{
			delay_1ms(2);
			timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_2, i*10);
		}
		for(int i =999;i>0;i--)
		{
			delay_1ms(2);
			timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_2, i*10);
		}	
		timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_2, 0);
		timer_disable(TIMER2);
		//pwmW end
	}
}

驱动效果：

Jacktang

GD32L233C能输出PWM的IO远多于6个，PWM的IO口不少

【GD32L233C-START评测】四、定时器PWM应用之驱动RGB灯 [复制链接]

3个控制管脚对应的定时器和PWM通道如下：

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