I2S/SPI interrupt fires only once, when restarted in IRQ routine (STM32H503)

chriskuku · ‎2025-06-09

I have set up an I2S interface. The idea is to send it an initial HAL_I2S_Transmit_IT() request.
In the ISR of SPI2 I'm sending the next HAL_I2S_Transmit_IT() and this way the transmit should be continously kept running.

What happens is, that the SPI ISR is entered once. The HAL_I2S_Transmit_IT() issued within the ISR, doesn't fire the subsequent IR. Why?

Saket_Om · ‎2025-06-13

Hello @chriskuku

The second call for HAL_I2S_Transmit_IT() should be in the HAL_I2S_TxCpltCallback().

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Saket_Om