CC2530 timer1 problem

le lemon

Other Parts Discussed in Thread: CC2530

Hi all

I want to generate IR signal.I have used timer3 to get the 38k carrier seccussfully,but I can't get modualted code(PWM) when I used timer1.

I start the timer1 and update the T1CC0 and T1CC1 at the ISR of ch1 compare up.I want to stop timer use this code :T1CTL =0.

I have wrote the code like this,IR_data is the testing data of PWM wave,what is the problem?

unsigned short IR_data[4]={0x0200,0x0100,0x0050,0x0500};

void main(void)
{
CLKCONCMD &= ~0x40;      //设置系统时钟源为32MHZ晶振
while(CLKCONSTA & 0x40); //等待晶振稳定为32M
CLKCONCMD &= ~0x07;      //设置系统主时钟频率为32MHZ
CLKCONCMD &= ~0x20;       //时钟速度32 MHz 定时器标记输出设置[5:3]8MHz
CLKCONCMD |= 0x10;       //时钟速度32 MHz 定时器标记输出设置[5:3]8MHz
CLKCONCMD &= ~0x08;       //时钟速度32 MHz 定时器标记输出设置[5:3]8MHz

while(1)
    {
    if(P0_1 == 1)
    {
  MyDelay(100);
  if(P0_1 == 0)
  {


            PERCFG |= 0x40;
      P2SEL &= ~0x10;
      P2DIR |= 0x80;

  IR_data_index = 0;
   time_tmp1=IR_data[IR_data_index++];
     time_tmp2=IR_data[IR_data_index++];

      T1CC1H = time_tmp1/256;
    T1CC1L = time_tmp1%256;
    T1CC0H = (time_tmp1+time_tmp2)/256;
    T1CC0L = (time_tmp1+time_tmp2)%256;
   T1CTL = 0x02;   //module mode
      T1CCTL1 = 0x1c;    //set on compare , reset on 0,compare mode

    T1CCTL1 |= 0x40;          // 模式选择通道1比较模式使能timer1通道1的中断
    T1IE   = 1;    //使能timer1的中断
       EA =1;    //使能总中断

  }
}
    }

}

#pragma vector=T1_VECTOR
__interrupt void T1_IRQ(void)
{
unsigned short time_tmp1 = 0;
unsigned short time_tmp2 = 0;
if(T1STAT | 0x02)
{

  if(IR_data_index <4)
  {
    time_tmp1=IR_data[IR_data_index++];
     time_tmp2=IR_data[IR_data_index++];

    T1CC1H = time_tmp1/256;
    T1CC1L = time_tmp1%256;
    T1CC0H = (time_tmp1+time_tmp2)/256;
    T1CC0L = (time_tmp1+time_tmp2)%256;

  }
  else
  {
   T1CTL =0;// stop timer
    T1IE   = 0;
       EA =0;
  }


}

if(T1STAT | 0x20)
{

}

}

over 10 years ago

0 le lemon over 10 years ago

Intellectual 280 points

Is there any code about generating PWM use timer1 and DMA?

0 YiKai Chen over 10 years ago in reply to le lemon

Guru 735695 points

The following example shows how to output 6.5K PWM with 50% duty cycle to P1.1 with CC2530 Timer 1.

PERCFG |= BV(6); // Select Timer 1 Alternative 2 location
P2DIR = (P2DIR & ~0xC0) | 0x80; // Give priority to Timer 1
P1SEL |= BV(1); // Set P1_1 to peripheral

T1CC0L = 0x3A; // PWM signal period
T1CC0H = 0x01;

T1CC1L = 0x9D; // PWM duty cycle
T1CC1H = 0x00;

T1CCTL1 = 0x1c;

T1CTL |= (BV(2)|0x03); // divide with 128 and to do i up-down mode

0 le lemon over 10 years ago in reply to YiKai Chen

Intellectual 280 points

Thanks
I have got the PWM with the same frequency,and I want to change the T1CC0 and T1CC1 at every cycle,how can I do it ?
I change the cycle in the ISR ,but the PWM is not correct.

0 YiKai Chen over 10 years ago in reply to le lemon

Guru 735695 points

I don't think it is reasonable to change T1CC0 and T1CC1 at every cycle. Why do you intend to do this?

0 le lemon over 10 years ago in reply to YiKai Chen

Intellectual 280 points

Because I want to gennerate IR signal ,so I should change the cycle and duty cycl immediately.
Do you have the example ahout this?

0 YiKai Chen over 10 years ago in reply to le lemon

Guru 735695 points

You can try to refer to www.ti.com/.../litabsmultiplefilelist.tsp

0 The Seven over 9 years ago in reply to YiKai Chen

Guru 11440 points

Hi Yikai

what does this code work for ？

P2DIR = (P2DIR & ~0xC0) | 0x80; // Give priority to Timer 1

P2DIR register is about the Port 0 peripheral priority control， and you want to set Port1 as PWM out ， is it necessary add this code here ？

i have a problem to set the pwm in zstack。

i want to set a PWM output in P12 ， i coding as like below：

  PERCFG |= BV(6);     //selected alt2 location
  P1SEL |= BV(2);      //set as perennial function
  HalTimer1Init(0);    // those function using from the hal_timer.c
  halTimer1SetChannelDuty(HAL_T1_CH0,10);// those function using from the hal_timer.c

but i found P12 is always set 1 ~~~~ Is there anything wrong with those setting？

BR!

0 YiKai Chen over 9 years ago in reply to The Seven

Guru 735695 points

Since you want to use Timer 1 as PWM output, the red line is to set Timer 1 as first priority which you can refer to CC2530 user guide. If you intend to use P1.2 as PWM output, you should use Timer 1 Alt.2 which you should configure PERCFG.

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CC2530 timer1 problem