CC2640R2F PWM

 

本文在 “cc2640r2f led控制" 基础上修改 以PWM 形式控制 LED

工程创建 略过

一、修改控制引脚配置文件

　　CC2640R2_LAUNCHXL.h 修改默认配置引脚如下

   

   

    CC2640R2_LAUNCHXL.c 修改PWM 默认对应引脚值

 

  二、修改 led.c 文件如下

#include <ti/sysbios/knl/Clock.h>
#include "util.h"
#include "board.h"

/*************************** LED 引脚 *************************************/

//static PIN_State led_state;

//static const PIN_Config led_pins[] = {
//    LED_R | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,
//    LED_G | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,
//    LED_B | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,
//    PIN_TERMINATE
//};

static PWM_Handle g_rled_pwm_handle = NULL;
static PWM_Handle g_gled_pwm_handle = NULL;
static PWM_Handle g_bled_pwm_handle = NULL;

#define pwm_led_hz  (10000)//100hz


/*static*/ void led_gpio_init(void){

  //if(!PIN_open(&led_state, led_pins)){
  
  //    PIN_open(&led_state, led_pins);
  //}   

    PWM_Params g_pwm_params;
  
    PWM_init();
    PWM_Params_init(&g_pwm_params);
    g_pwm_params.periodUnits = PWM_PERIOD_US;
    g_pwm_params.periodValue= 10000;
    g_pwm_params.dutyUnits = PWM_DUTY_US;
    g_pwm_params.dutyValue = 0;

    g_rled_pwm_handle = PWM_open(CC2640R2_LAUNCHXL_PWM0, &g_pwm_params);
    g_gled_pwm_handle = PWM_open(CC2640R2_LAUNCHXL_PWM1, &g_pwm_params);
    g_bled_pwm_handle = PWM_open(CC2640R2_LAUNCHXL_PWM2, &g_pwm_params);

    PWM_start(g_rled_pwm_handle);
    PWM_start(g_gled_pwm_handle);
    PWM_start(g_bled_pwm_handle);  
}

static void gpio_set_value(PIN_Id id, unsigned char val, uint32_t duty){

  //PIN_setOutputValue(&led_state, id, val);
  uint32_t dutyValue;
  PWM_Handle p_handle;

  dutyValue = (val == 0) ? 0: duty;
  if(id == LED_R){
    p_handle = g_rled_pwm_handle;
  }else if(id == LED_G){
      p_handle = g_gled_pwm_handle;
  }else if(id == LED_B){
      p_handle = g_bled_pwm_handle;
  } 
  
  PWM_stop(p_handle);
  PWM_setDuty(p_handle, dutyValue);
  PWM_start(p_handle);
}

/*******************************************************************/
static Clock_Struct led_period_clock;
#define LED_PERIOD_TIME  (100) //100ms

static unsigned char led_cur_state = 0;

typedef struct led_ctr_{
    
    unsigned int   gpio;   //对应GPIO引脚
    unsigned char  state;  //引脚当前状态    
    unsigned char  _pd;    //
    unsigned short count;  //1~0xFFFE 闪烁次数，0xFFFF-不间断闪，0-切换当前状态， 
    unsigned short period; //闪烁周期
    unsigned short times;  //当前时间计数，100ms为单位    

    uint32_t  duty;        //PWM 占空比
}led_ctr;

#define LED_NUM_MAX  (3)
led_ctr g_led_ctr[LED_NUM_MAX] = {
    
    {LED_R, 0, 0, 0, 0},
    {LED_G, 0, 0, 0, 0},
    {LED_B, 0, 0, 0, 0}
};

static void SDI_led_process(UArg arg){
    
    unsigned char i;
    unsigned char n = 0;
    
    for(i=0; i<LED_NUM_MAX; i++){
                
        if(g_led_ctr[i].times > 1){
              g_led_ctr[i].times--;    
              
        }else if(g_led_ctr[i].times == 1){
          
              g_led_ctr[i].times = 0;    
              g_led_ctr[i].state ^= 0x01;
              gpio_set_value(g_led_ctr[i].gpio, g_led_ctr[i].state, g_led_ctr[i].duty);
              
              if(g_led_ctr[i].count){
                if(g_led_ctr[i].count != 0xFFFF)
                  g_led_ctr[i].count--;
                g_led_ctr[i].times = g_led_ctr[i].period;
              }
        }else{
        
        }

        if(g_led_ctr[i].times || g_led_ctr[i].count) n++;
    }
    
    if(!n){                
        Util_stopClock(&led_period_clock);
        led_cur_state = 0;
    }
}

/* led: 对应的引脚  count: 闪烁次数  times_100ms:闪烁频率 以100ms为单位  onoff:开始为亮/灭  duty: pwm占空比 */
void SDI_led_indication(unsigned int led, unsigned char count, unsigned short times_100ms, unsigned char onoff, uint32_t duty){
    unsigned char i=0;
    static unsigned char led_api_init = 0;
    
    //引脚判断
    for(i=0; i<LED_NUM_MAX; i++){        
        if(led == g_led_ctr[i].gpio){
            break;
        }        
    }
    
    if(i == LED_NUM_MAX) return;
    
    //设置参数
    if(count != 0){
      g_led_ctr[i].count = (count == 0xFF) ? 0xFFFF: ((count - 1) << 1);
      g_led_ctr[i].period = times_100ms;
      g_led_ctr[i].times  = times_100ms;      
      
    }else{
      g_led_ctr[i].count  = 0;
      g_led_ctr[i].period = 0;
      g_led_ctr[i].times  = 0;

      //g_led_ctr[i].duty = 0;
    }
    g_led_ctr[i].duty = duty * 100;
    g_led_ctr[i].state = onoff;
    
    //初始化LED
    if(!led_api_init){
        led_api_init = 1;
        
        //led_gpio_init();
        
        Util_constructClock(&led_period_clock, SDI_led_process,
                        LED_PERIOD_TIME, LED_PERIOD_TIME, false, NULL);                        
    }

    //执行控制
    if(!led_cur_state){
        
        Util_startClock(&led_period_clock);
        led_cur_state = 1;
    }
    
    gpio_set_value(g_led_ctr[i].gpio, g_led_ctr[i].state, g_led_ctr[i].duty);
}

 

 三、控制使用示例

simple_peripheral_oad_onchip.c 文件如下函数增加测试

 

四、编译烧录，复位后测试引脚上波形如下