MSPM0G3507: Uart rx and RXtimeout interrupt not working togather.

Mehul Dabholkar

Part Number: MSPM0G3507

Tool/software:

i configure uart with two interrupts. Rx interrupt and Rx timeout. but seems like both not working together. when i disable RX interrupt then rx time out interrupt work fine.

7 months ago

0 Bruce McKenney 7 months ago

Guru 99445 points

My first guess is that, in response to the RX interrupt, you're emptying the Rx FIFO. The RTOUT interrupt will only trigger if the Rx FIFO is non-empty [Ref TRM (SLAU846B) Table 18-8].

If so, the solution would be to have the RX interrupt always leave (at least) one byte in the FIFO (and maybe increase the FIFO threshold). Then for the RTOUT interrupt, you would empty the FIFO, in effect disabling the feature until the next byte arrives.

0 Bruce McKenney 7 months ago in reply to Bruce McKenney

Guru 99445 points

I noticed after posting this that the UART doesn't have a register that says how many bytes are in the Rx FIFO.

A strategy for dealing with this is presented over here:

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1316652/mspm0l1306-uart-rxto-regardless-of-fifo-state

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MSPM0G3507: Uart rx and RXtimeout interrupt not working togather.