Efficient Method to Generate a Sine Wave Using DMA and TIM1

[thannara123]

Hi 

What is the most efficient method in program logic to generate a sine wave using an H-bridge with an advanced timer?

I am using TIM1 on an STM32 microcontroller, which has two channels (Channel 1 and Channel 2) and complementary outputs. For generating the sine wave, I am using the following configuration:

• Positive Half-Cycle: The MOSFETs Q1 and Q4 are driven with PWM signals, while Q2 and Q3 are turned off.
• Negative Half-Cycle: The MOSFETs Q2 and Q3 are driven with PWM signals, while Q1 and Q4 are turned off.

I am also using center-aligned mode. What is the best and most efficient method in program logic to achieve this?

I need programming logic on how to efficiently feed a sine wave to CCR1 and CCR2 via DMA to achieve this. What is the best method?

 

 Can I feed a full sine wave array value using a single array (look up table )? or should each half-cycle be fed sequentially? Specifically, should the first half-cycle be fed, and then the polarity of the channels be inverted to handle the next half-cycle? What is the most efficient and straightforward way to achieve this?

 

@waclawek.jan 

[Andrew Neil]

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@thannara123 wrote:

What is the most efficient (sic) method...

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That depends on your definition of, "efficient"; eg,

 

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@thannara123 wrote:

 Can I feed a full sine wave array value using a single array (look up table )? or should each half-cycle be fed sequentially?  

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A full cycle table is obviously going to take up more memory that a half cycle - so is memory efficiency your prime concern?

Having  just a half-cycle table saves memory, but gives you a bit more work to do - so is programmer efficiency your prime concern?

You could just use a quarter-cycle table ...