2530输出方波

user6069081

Expert 1940 points

芯片：2530

协议栈：mesh1.0.0

问题：请问我用以下程序输出4khz的方波是否正确？用P1_2的IO翻转模拟方波。

void T3timerInit( void )
{
    P1SEL &= ~0x04;            //将P1_2设置为通用IO输出
    P1DIR |= 0x04;
    P1_2 = 0;
    T3CTL |= 0x08;             //开溢出中断
    T3IE = 1;                  //开T3定时器总中断  
    T3CTL|=0X80;               //16分频
    T3CTL &= ~0X03;            //自动重装
    T3CTL |= 0X10;             //启动
    EA = 1;                    //开总中断
}


/************************************

中断函数

************************************/

#pragma vector = T3_VECTOR  //定时器 T3

__interrupt void T3_ISR(void)
{

    TIMIF &= ~BV(0);    //清中断标志位
    P1_2 = ~P1_2;   // 电平翻转产生方波
}

6 年多前

0 Viki Shi 6 年多前

TI__Guru**** 188340 points

用timer输出PWM即可，参考下这边的代码:sunmaysky.blogspot.com/.../how-to-output-pwm-from-cc2530.html

0 user6069081 6 年多前回复 Viki Shi

Expert 1940 points

请问我想用你所给的代码输出pwm到P1_3，那么我如何修改使得Timer3输出pwm到通道0即P1_3呢？

  PERCFG &= (~(0x20)); // Select Timer 3 Alternative 1 location
  P2SEL |=0x20;
  P2DIR |= 0xC0;  // Give priority to Timer 1 channel2-3
  P1SEL |= BV(4);  // Set P1_4 to peripheral, Timer 1,channel 2
  P1DIR |= BV(4);

  T3CTL &= ~0x10;             // Stop timer 3 (if it was running)
  T3CTL |= 0x04;              // Clear timer 3
  T3CTL &= ~0x08;             // Disable Timer 3 overflow interrupts
  T3CTL |= 0x03;              // Timer 3 mode = 3 - Up/Down

  T3CCTL1 &= ~0x40;           // Disable channel 0 interrupts
  T3CCTL1 |= 0x04;            // Ch0 mode = compare
  T3CCTL1 |= 0x10;            // Ch0 output compare mode = toggle on compare

  T3CTL &= ~0xE0;   // Clear Prescaler divider value
  T3CTL |= 0xA0;    //Set Prescaler divider value = Tick frequency /32
  T3CC0 = 128;      //Set ticks = 128

  // Start timer
  T3CTL |= 0x10;

0 YiKai Chen 6 年多前回复 user6069081

Guru 109510 points

P1SEL |= BV(4);/P1DIR |= BV(4); 改為P1SEL |= BV(3);/P1DIR |= BV(3);

0 user6069081 6 年多前回复 YiKai Chen

Expert 1940 points

T3CCTL1 是否要修改为T3CCTL0？

0 YiKai Chen 6 年多前回复 user6069081

Guru 109510 points

YES

0 user6069081 6 年多前回复 YiKai Chen

Expert 1940 points

你好，我使用了以下的程序，但是得出的波形不是我想要的4khz的方波，请问哪里需要改进吗，非常感谢！

void pwmoutput( void )
{
  PERCFG &= (~(0x20)); 
  P2SEL |=0x20;	
  P2DIR |= 0xC0;  	
  P1SEL |= BV(3);  // Set P1_3 to peripheral, Timer 1,channel 2
  P1DIR |= BV(3);	

  T3CTL &= ~0x10;             // Stop timer 3 (if it was running)
  T3CTL |= 0x04;              // Clear timer 3
  T3CTL &= ~0x08;             // Disable Timer 3 overflow interrupts
  T3CTL |= 0x03;              // Timer 3 mode = 3 - Up/Down

  T3CCTL0 &= ~0x40;           // Disable channel 0 interrupts
  T3CCTL0 |= 0x04;            // Ch0 mode = compare
  T3CCTL0 |= 0x10;            // Ch0 output compare mode = toggle on compare

  T3CTL &= ~0xE0;   // Clear Prescaler divider value
  T3CTL |= 0xA0;    //Set Prescaler divider value = Tick frequency /32
  T3CC0 = 128;      //Set ticks = 128

  // Start timer
  T3CTL |= 0x10;
}

0 YiKai Chen 6 年多前回复 user6069081

Guru 109510 points

調整一下T3CC0看看

0 user6069081 6 年多前回复 YiKai Chen

Expert 1940 points

请问YK，osal_pwrmgr_device( PWRMGR_BATTERY )会对输出PWM有影响吗？

0 YiKai Chen 6 年多前回复 user6069081

Guru 109510 points

會，進入休眠PWM會失效

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2530输出方波