How do you properly ack peripheral IRQs in STM32L?

[jjuniman]

Posted on March 10, 2011 at 15:55

How do you properly ack peripheral IRQs in STM32L?

[ColdWeather]

Posted on May 17, 2011 at 14:27

In general you should clear in the PERIPHERAL the bit that caused the interrupt or disable the interrupt.

  NVIC_ClearPendingIRQ(SPI2_IRQn); // not really neccessary.   NVIC_EnableIRQ(SPI2_IRQn);   pSpiBus->CR2 |= SPI_CR2_TXEIE; However as soon as I enable the interrupt, I hit the ISR over & over because I'm not acking the interrupt correctly. My ISR looks like this: void SPI2_IRQHandler(void) {     // contunue transmission:    pSpiBus-> DR = ....;     // or       pSpiBus->CR2 &= ~SPI_CR2_TXEIE; // disable interrupt }

[jjuniman]

Posted on May 17, 2011 at 14:27

Wait a minute, I'm an idiot. The SPI_CR2_TXEIE generates an interrupt whenever the TX buffer is empty, not when it's done transmitting. That's why I'm hitting it over & over. duh.