is there any way for generating two PWM waves in cc2530dk board ??

dhileep shyl

Other Parts Discussed in Thread: CC2530

i already was able to generate one pwm signal and i a getting the output i need to generate 1 more signal !! how can i achieve this??

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735695 points

You can create another PWM using another Timer.

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

sir do u have any samples ... i tried but i couldn't get it rite !!!

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

hi sir .... you have any example program sir ... i already used timer 1 for pwm ... now what can be done???

0 YiKai Chen over 10 years ago in reply to dhileep shyl

Guru 735695 points

If I remember correctly, I had shown you how to output PWM to P1_4 using Timer 3.

The following sample code can send PWM to P1_4.

PERCFG &= (~(0x20)); // Select Timer 3 Alternative 1 location
P2SEL |=0x20;
P2DIR |= 0xC0; // Give priority to Timer 1 channel2-3
P1SEL |= BV(4); // Set P1_0 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 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

yes sir but in this program how can i set duty cycle sir ???

0 YiKai Chen over 10 years ago in reply to dhileep shyl

Guru 735695 points

You can set them with TxCTL and TxCCTLx.

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

okey sir i will try it and get back to you

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

PERCFG &= ~0X40 ;
P2DIR = (P2DIR & ~0XC0)| 0X80 ;
P0SEL |= 0X08 ;
T1CC0L = 0XFF ;
T1CC0H = 0X7F ;
T1CC1L = 0x78 ;
T1CC1H = 80 ;
//T1CC1H = (int8) zcldata ;
//T1CC1 = 25 ;
T1CCTL1 = 0X1C ;
T1CTL |= 0X0F ;

sir i am already using the above program to generate a PWM using timer1 which will give me the PWM in the pin 11 of P18 .

when i use the program u mentioned above the above wave from pin11 of P18 is not coming and also the pulse which is supposed to come from pin14 of P20 is also not coming sir .. what have i did wrong ????

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

hi sir ,, any idea on my comment ??

0 YiKai Chen over 10 years ago in reply to dhileep shyl

Guru 735695 points

Try my latest test code to output PWM on P1_6 using Timer 3.

PERCFG =0x20; // Select Timer 3 Alternative 0 location
P2SEL =0x20;
P1SEL |= BV(6); // Set P1_6 to peripheral

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 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

thank you sir !!! the waves are generated as per ...

in my code for timer 1 i just changed the value in the register T1CC1H for changing the duty cycle but i couldnt figure out how to alter the duty cycle in this code ??? would you tell me how ??

0 YiKai Chen over 10 years ago in reply to dhileep shyl

Guru 735695 points

You can refer to Chapter 9 and Chapter 10 in CC2530 user guide to get detail information.

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

ok sir !!! after adding this code the board is not responding and it is turning off sir ??

0 YiKai Chen over 10 years ago in reply to dhileep shyl

Guru 735695 points

I see you said your can see PWM is generated. What do you mean the board is not responding and turning off?

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

i have used the potentiometer in the board after putting that code the lcd is not working , i mean the varying pot values are not displayed in the lcd after a few minutes the lcd is turned off

0 YiKai Chen over 10 years ago in reply to dhileep shyl

Guru 735695 points

I just give you PWM example but don't know how you make it work with LCD and potentiometer. If there is any conflicts, you should can find it out and revise it.

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

ok sir .... this doesnt means that the board is faulty and all !!!

0 YiKai Chen over 10 years ago in reply to dhileep shyl

Guru 735695 points

If you can see PWM output, I don't think there is problem on HW.

0 dhileep shyl over 10 years ago in reply to YiKai Chen

Genius 4930 points

ok sir ...let me try and get back to you !!

0 frank li99 over 9 years ago in reply to YiKai Chen

Intellectual 640 points

YiKai Chen said:
Try my latest test code to output PWM on P1_6 using Timer 3.

PERCFG =0x20; // Select Timer 3 Alternative 0 location
P2SEL =0x20;
P1SEL |= BV(6); // Set P1_6 to peripheral

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;

I tried your code and I could get 50% duty in P1_6. How could I change the duty? I tried to change the value of T3CC0 , but nothing happened.

0 YiKai Chen over 9 years ago in reply to frank li99

Guru 735695 points

The following example shows you how you output 6.5K PWM with 50% duty cycle to P1.1 with CC2530 Timer 1 and you can change duty cycle by adjusting T1CC1L .

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 frank li99 over 9 years ago in reply to YiKai Chen

Intellectual 640 points

I wonder if TIMER3 could output 1%-100% duty in P1_6. I know that TIMER1 channel 0 could only output 50% duty. Is that TIMER3 channel 0 the same? Thank you.

0 YiKai Chen over 9 years ago in reply to frank li99

Guru 735695 points

As I know, only TI can do this duty cycle change.

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

Guru 11440 points

hi Yikai

those code does not work 。

P16 do not output anything。

PERCFG =0x20; it is select Timer3 Alternative 2 location not Alternative 0 location

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

Guru 735695 points

Do you try to PWM example in sunmaysky.blogspot.tw/.../how-to-output-pwm-from-cc2530.html ?

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

Guru 11440 points

i am in China ， i sorry i can't open your link！

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

Guru 735695 points

Refer to CC253x/4x User's Guide. The following sample code can send PWM to P1_4.

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 The Seven over 9 years ago in reply to YiKai Chen

Guru 11440 points

Thanks！ Yikai

but those code doesn't work！

Q1 : Why does it set ======》 P2DIR |= 0xC0; // Give priority to Timer 1 channel2-3
it is matter with Timer3 compare output ？？？？

Q2： why does it set ======》 T3CC0 = 128; //Set ticks = 128
i saw it set the T3CCTL1 channel 1， why does it set the T3CC0 ?????
they were different channel output

BR!

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

Guru 735695 points

I test it on my CC2530DK and there is no problem to output PWM on P1.4.

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

Guru 11440 points

really？？？

i using the logic analysis ， there is nothing PWM output from P117，P16，P14, P13

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

Guru 735695 points

Yes, I can see PWM on P1.4 which is mapped to P18 pin 14 on SmartRF05EB.

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

Guru 11440 points

Hi yikai ，

i know why does it could not sending the PWM。

1. if we using debug mode ， the SmartRF05EB hardware will catch the pin output！
2. the vaule of CMP should be right for the Timer3 Mode

BR!

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

Guru 735695 points

It's good to know you find the problem.

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is there any way for generating two PWM waves in cc2530dk board ??