【祖传点灯】Ai-WB2-32S开发环境搭建及呼吸灯测试

在不懈的申请下，终于中奖一次，周一一早就收到了安信可发来的Ai-WB2开发板。整个开发板的布局中规中矩，很贴心的带了串口转换芯片和板载了3色led灯，对我等初学者还是特别的友好，开始本次的点灯之路。

根据论坛的教程先把开发环境搭建起来，这里推荐安信可官方账号发布的教程https://blog.csdn.net/Boantong_/article/details/128480919，保险一点儿，保险一点儿，从网盘慢慢把三个文件下载下来。按照文档安装。这里特别需要注意的是Ai-WB2系列SDK开发包的路径问题，一定要注意。我在完全按照指导做完后，Clean project时出现错误。

手动在cmd界面进行make后看到提示如图，这里可以肯定是sdk的路径有问题，造成找不到mk文件，重新修改路径和环境变量后，正常编译示例。参照Ai-Thinker-WB2/applications/peripherals/demo_pwm/里面的代码，我们来实现pwm控制led实现呼吸灯效果。

#include <stdio.h>
#include <string.h>
#include <FreeRTOS.h>
#include <task.h>
#include <bl_gpio.h>

#include <bl602.h>
#include <bl602_gpio.h>
#include <bl602_glb.h>
#include <bl_pwm.h>

#define PWM_Get_Channel_Reg(ch)  (PWM_BASE+PWM_CHANNEL_OFFSET+(ch)*0x20)
#define PWM_STOP_TIMEOUT_COUNT          (160*1000)

#define GPIO_BLUELED_PIN 3 //蓝色
#define GPIO_REDLED_PIN 14
#define GPIO_GREENLED_PIN 17

/// @brief Copy from PWM_Smart_Configure. Use Bus Clock instead of External Crystal Clock for PWM Timer
/// @param ch PWM Channel
/// @param clkDiv PWM clock divider
/// @param period PWM period
/// @param threshold2
/// @return
BL_Err_Type PWM_Smart_Configure2(PWM_CH_ID_Type ch, uint16_t clkDiv, uint16_t period,uint16_t threshold2)
{
    uint32_t tmpVal;
    uint32_t timeoutCnt = PWM_STOP_TIMEOUT_COUNT;
    /* Get channel register */
    uint32_t PWMx = PWM_Get_Channel_Reg(ch);

    tmpVal = BL_RD_REG(PWMx, PWM_CONFIG);
    // if(BL_GET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL) != PWM_CLK_XCLK){
    if(BL_GET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL) != PWM_CLK_BCLK){
        BL_WR_REG(PWMx, PWM_CONFIG, BL_SET_REG_BIT(tmpVal, PWM_STOP_EN));
        while(!BL_IS_REG_BIT_SET(BL_RD_REG(PWMx, PWM_CONFIG), PWM_STS_TOP)){
            timeoutCnt--;
            if(timeoutCnt == 0){
                return TIMEOUT;
            }
        }
        // tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL, PWM_CLK_XCLK);
        tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL, PWM_CLK_BCLK);
    }
    tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_OUT_INV, PWM_POL_NORMAL);
    tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_STOP_MODE, PWM_STOP_GRACEFUL);
    BL_WR_REG(PWMx, PWM_CONFIG, tmpVal);

    /* Config pwm division */
    BL_WR_REG(PWMx, PWM_CLKDIV, clkDiv);

    /* Config pwm period and duty */
    BL_WR_REG(PWMx, PWM_PERIOD, period);
    BL_WR_REG(PWMx, PWM_THRE1, 0);
    BL_WR_REG(PWMx, PWM_THRE2, threshold2);

    return SUCCESS;
}

void led_pwm()
{
    uint8_t value = 1;
    uint8_t flag = 0;
    while (1)
    {
    	if(flag == 0)
    	{
    		value++;
    		if(value == 255)
    			flag = 1;
    	}
    	if(flag == 1)
    	{
    		value--;
    		if(value == 0)
    			flag = 0;
    	}
        //PWM_Smart_Configure2(3, 1, 255, value);
        //PWM_Channel_Enable(3);
        PWM_Smart_Configure2(4, 1, 255, value);
        PWM_Channel_Enable(4);
        //PWM_Smart_Configure2(2, 1, 255, value);
        //PWM_Channel_Enable(2);
        vTaskDelay(10);
    }

}
void main(void)
{
    GLB_GPIO_Cfg_Type cfg[3] = {
        {
            .drive = 0,
            .smtCtrl = 1,
            .gpioMode = GPIO_MODE_OUTPUT,
            .pullType = GPIO_PULL_DOWN,
            .gpioPin = 14,  /// red
            .gpioFun = 8,
        },
        {
            .drive = 0,
            .smtCtrl = 1,
            .gpioMode = GPIO_MODE_OUTPUT,
            .pullType = GPIO_PULL_DOWN,
            .gpioPin = 17,  /// green
            .gpioFun = 8,
        },
        {
            .drive = 0,
            .smtCtrl = 1,
            .gpioMode = GPIO_MODE_OUTPUT,
            .pullType = GPIO_PULL_DOWN,
            .gpioPin = 3,  /// blue
            .gpioFun = 8,
        },
    };

    for (int i = 0; i < 3; i++) {
        GLB_GPIO_Init(cfg + i);
        PWM_CH_ID_Type ch = cfg[i].gpioPin % PWM_CH_MAX;
        PWM_Channel_Disable(ch);
    }
    xTaskCreate(led_pwm, "led_pwm", 1024, NULL, 15, NULL);

}

这里要注意几个关键的头文件，需要包含

#include <bl602.h>
#include <bl602_gpio.h>
#include <bl602_glb.h>
#include <bl_pwm.h>

最终实现效果如下

好事多磨，在园长和坛友的支持下终于点亮咯。