STM32 timer triggers ADC to collect data and send it to the host computer

tangjc2001

STM32 timer triggers ADC to collect data and send it to the host computer [Copy link]

Now our school requires writing a program to realize the timer triggering ADC to collect data and send it to the host computer for drawing

I set up a six-byte DMA buffer to store the data collected by the ADC, and then transfer it to the serial port through DMA. The sampling frequency is 1Khz. I set the timer to update the interrupt once every 0.001s. The timer interrupt function collects data and then makes a serial port DMA request. However, I don't know whether the timer will continue to generate update interrupts when the interrupt service function is in progress. I would like to ask if there is any design idea with clearer logic.

Gen_X

There is definitely no problem with the 1mS interrupt, and the collection is not mentioned, but there is a problem if it is not sent in the 1ms cycle, because there is a delay in window communication and the task may not be completed.

vincentc543

The serial port may be too slow, so you can use USB to transfer data.

Or reduce the 1ms interruption frequency so that the serial port speed can keep up.

tangjc2001

vincentc543 posted on 2022-6-6 09:06 It may be stuck because the serial port speed is not fast enough. You can use USB to transfer data. Or reduce the 1ms interrupt frequency so that the serial port speed can keep up.

What I want is to write the ADC acquisition program in the timer interrupt program. Every time an interrupt is generated, data is collected and then transmitted. I don't know if this is possible.

Gen_X

The timer cycle triggers ADC, DMA transfer, and then ADC completes the interrupt to get data and hands over a flag to MAIN. In the main program, a query loop is performed. If there is a flag from ADC, USART communicates to PC, clears the flag, and then waits for the next ADC end flag.

Gen_X

You can also use PWM to trigger the ADC. You can query the triggering method of the ADC below and select a method according to the above method.

I have tried it, it is very easy to use, and it can also use PWM without output