[Solved]UART rx ISR not working

[blackpearl21]

i got the solution,

i have to use ESP_ERROR_CHECK(uart_isr_free(EX_UART_NUM)); before uart_isr_register, as install driver also initialise interrupt subroutine.

Thank for help

[ningappa BS]

hi,
am also looking for the same, am trying separate uart interrupt there am little confuse about the interrupt API's ,can u share that code.
thanks

[blackpearl21]

hi,
am also looking for the same, am trying separate uart interrupt there am little confuse about the interrupt API's ,can u share that code.
thanks

sorry for late reply

here is the code on github
https://github.com/theElementZero/ESP32 ... nterrupt.c

[snahmad75]

Hi,

I am new to esp32 uart uage.

Is your custom interrupt handler is transmit / write to uart?

on esp32 I received message through CAN bus and i need to transmit to uart.

so far only UART2 is working for me.
only printf write to uart as far i can see. it is same uart as my debug console.

Any idea about to how to receive data via uart as well.

[snahmad75]

here is the code on github
https://github.com/theElementZero/ESP32 ... nterrupt.c[/quote]


The above example program is not working for me. I tried with both UART 0 and UART 2 on esp32 board. interrupt does not gets trigger.

How can I interrupt it.

[vinimac]

Dont forget to call usr_isr_free before uart_isr_register

Code: Select all

// release the pre registered UART handler/subroutine
    ESP_ERROR_CHECK(uart_isr_free(EX_UART_NUM));

[luisyge]

I solved by placing uart_isr_free(UART_PORT) before registering the new isr