UART_1 callback not being set

Question

I am unable to use UART 1 with a very simple use case.

All I need to do is enable an interrupt callback when there is data to receive from the UART. I know that UART0 is in use, so I figure UART1 can be used. In any case, I have had no success.

This is my overlay file:

&uart1 {
    compatible = "nordic,nrf-uarte";
    status = "okay";
    tx-pin = < 12 >;
    rx-pin = < 13 >;
};

This is my prj.conf: (As you can see I have tried several combinations of configurations to no avail)

## UART
#########################
CONFIG_SERIAL=y
CONFIG_UART_ASYNC_API=y
CONFIG_UART_NRFX=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y

# CONFIG_UART_1_NRF_UARTE=y
# CONFIG_UART_1_INTERRUPT_DRIVEN=y
# CONFIG_UART_NRFX=y
# CONFIG_UART_1_ASYNC=y
# CONFIG_UART_1_NRF_HW_ASYNC=y
# CONFIG_UART_INTERRUPT_DRIVEN=y

# CONFIG_UART_NRFX=y
# CONFIG_NRF_SW_LPUART=y

# CONFIG_UART_1_ASYNC=y
# CONFIG_UART_1_INTERRUPT_DRIVEN=n
# CONFIG_UART_1_NRF_HW_ASYNC=y
# CONFIG_UART_1_NRF_HW_ASYNC_TIMER=2
# CONFIG_NRFX_TIMER2=y

And here is my source code that I am writing to use the bus:

// Retreive device from DeviceTree
uart0_dev = device_get_binding(UART1);
if (uart0_dev == NULL) {
    LOG_ERR("UART1 Device not found");
    return;
}

// Configure the UART serial bus
struct uart_config uart_cfg = {
    .baudrate   = 115200,
    .data_bits  = UART_CFG_DATA_BITS_8,
    .flow_ctrl  = UART_CFG_FLOW_CTRL_NONE,
    .parity     = UART_CFG_PARITY_NONE,
    .stop_bits  = UART_CFG_STOP_BITS_1
};
int ret = 0;

ret = uart_configure(uart0_dev, &uart_cfg);
LOG_ERR_AND_RETURN(ret, "uart_configure()");

bool user_data = true;
ret = uart_callback_set(uart0_dev, uart_on_rx_cb, &user_data);
LOG_ERR_AND_RETURN(ret, "uart_callback_set()");

The error I see is from the function uart_callback_set(), which returns -ENOTSUP (-134). Digging through the drivers, there is a missing field to one of the structs (the .async field?) and this should be set assuming that the CONFIG_UART_1_NRF_UARTE configuration is set, however I cannot seem to turn this symbol to 'y' because it is not allowed for user space use.

Where might I be going wrong? I assume this should rather simple.

Thanks

Susheel Nuguru · Accepted Answer

Hi Please use 
 uart_irq_callback_user_data_set instead of uart_callback_set to make it work. I tested this to work with below config 
 
 CONFIG_SERIAL=y CONFIG_UART_INTERRUPT_DRIVEN=y CONFIG_UART_ASYNC_API=y CONFIG_UART_1_INTERRUPT_DRIVEN=y

UART_1 callback not being set

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