Sinus generator

[Andrei Gheorghiu]

Posted on October 06, 2017 at 16:58

Hello, i have to make  a Sinus Generator can you please give me any hint or a gide how to start ?

Thank you.

[Tesla DeLorean]

Posted on October 06, 2017 at 17:41

Think I've previously demonstrated a TIM+DMA+DAC example feeding a sine wave table to the DAC at a defined pace.

Circular DMA on buffer

Triggered via a TIM at frequency X table length

DMA copies to DAC->DR

[Andrei Gheorghiu]

Posted on October 08, 2017 at 16:24

Hello again SIr,

Can you please send me a link with this example ?

Thank you verry much

[Tesla DeLorean]

Posted on October 08, 2017 at 19:00

https://community.st.com/0D50X00009XkiK9SAJ

[Andrei Gheorghiu]

Posted on October 18, 2017 at 20:02

Hello Clive,

I am i am stuck at a step in the code,

How can i make the DMA to allow 2 octet only for every IRQ from TIM5

To send to an external DAC.

Below is a link with my current project ,

https://drive.google.com/file/d/0B7fbIHd58fTedUtjVDBYajg4MUk/view?usp=sharing

Thank you for your support,

Best Regards,

Andrei

[Tesla DeLorean]

Posted on October 18, 2017 at 20:22

Really can't provide assistance with HAL code, you'd want to avoid placing blocking code in the IRQ Handler.

You might be better using a memory transfer to the SPI->DR in 16-bit mode using DMA triggered by a TIM on the same APB. ie not use a direct SPI+DMA linkage where SR.TXE drives the DMA service.