MSP for generating 5 phase shifted square waves

Nitish Agarwal91

Other Parts Discussed in Thread: MSP430F5529

Hi,

I want to generate 5 square waves shifted in phase running at constant frequency. I have used the CCR mode to generate the 5 signals but the micro-controller with this capability requires large number of pins which is not the option I have. Is there any other way in which I can generate the 5 square waves by synchronizing two timers and using their corresponding CCRs to generate 5 square waves.

Regards,

Nitish

over 7 years ago

0 Danny F over 7 years ago

Genius 3850 points

Set the pins to flip on match for the output compare module.

0 Cameron LaFollette over 7 years ago in reply to Danny F

TI__Genius 14875 points

Hi Nitish,
When you say you dont have the option of large number of pins, does this mean you dont have the pins available?
What device are you using and what pins are available?
If you have other GPIO available, you could always toggle them in an interrupt.

0 Nitish Agarwal91 over 7 years ago in reply to Cameron LaFollette

Intellectual 280 points

I am currently using MSP430F5529 for this purpose and able to do that as well as it has 7 CCR registers but I don't want to use MSP with large number of pins. So looking for some other way to do this. I want to generate 70Khz precise signals. Interrupts will result in time lags.

Regards

Nitish

0 Clemens Ladisch over 7 years ago in reply to Nitish Agarwal91

Guru 316940 points

It might be possible to change multiple pins synchronously with a single timer and DMA, but none of the smaller chips has DMA.

0 Cameron LaFollette over 7 years ago in reply to Clemens Ladisch

TI__Genius 14875 points

Nitish,
Unfortunately, I cannot think of another way of doing this.

0 Nitish Agarwal91 over 7 years ago in reply to Cameron LaFollette

Intellectual 280 points

I tried using it with DMA and it worked for creating 5 PWM signals. I stored the data in some memory location and with the use of a timer i send out that data to a output port.

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MSP for generating 5 phase shifted square waves