Multiple UART on NRF52833

RE: Multiple UART on NRF52833

Jared — Wed, 30 Mar 2022 12:39:38 GMT

Hi ,

You need to set the logger backend in the sdk_config.h file from UART to RTT.

regards

Jared

RE: Multiple UART on NRF52833

sne_333 — Tue, 29 Mar 2022 05:53:02 GMT

I have solved that issue. Can you help me with one thing. I am receiving lot of data from the other MCU via libuarte. I want to print that data on the RTT terminal... How can I do that using NRF_LOG_INFO??

My libuarte handler is as follows:-

void libuart_event_handler(void *context, nrf_libuarte_async_evt_t *p_evt) {
static uint8_t index;

nrf_libuarte_async_t *p_libuarte = (nrf_libuarte_async_t *)context;
ret_code_t ret;

switch (p_evt->type) {
case NRF_LIBUARTE_ASYNC_EVT_ERROR: {
NRF_LOG_ERROR("LIBUARTE ERROR");
break;
}
case NRF_LIBUARTE_ASYNC_EVT_RX_DATA: {
// Receive complete
memset(buffer,'0',sizeof(buffer));
memcpy(buffer, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
int data_length = p_evt->data.rxtx.length;

nrf_libuarte_async_rx_free(p_libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
break;
}
case NRF_LIBUARTE_ASYNC_EVT_TX_DONE: {
// Transmit complete

break;
}
}
}

How can I print the buffer values on RTT?? Size of buffer is 256.

Regards,

Snehal

RE: Multiple UART on NRF52833

Jared — Wed, 23 Mar 2022 08:01:37 GMT

Hi,

Can you start the program with the debugger and see what instruction is at 0x000287A8 in the Dissembler view?

RE: Multiple UART on NRF52833

sne_333 — Wed, 23 Mar 2022 04:25:36 GMT

Hi,

So this particular line ".p_data = p_evt->data.rxtx.p_data," has the received data right?

I also tried to debug the firmware. I am receiving the data from the other controller but after receiving the data I am getting this error in the logs:-

<error> app: LIBUARTE ERROR
<error> app: LIBUARTE ERROR
<error> hardfault: HARD FAULT at 0x000287A8
<error> hardfault: R0: 0x00000000 R1: 0x20006880 R2: 0x0A0D6466 R3: 0x20006878
<error> hardfault: R12: 0x200067A4 LR: 0x00029C2D PSR: 0x61000038
<error> hardfault: Cause: Data bus error (return address in the stack frame is not related to the instruction that caused the error).

What could have caused this issue?

Regards,

Snehal

RE: Multiple UART on NRF52833

Jared — Tue, 22 Mar 2022 13:53:46 GMT

Hi,

You can use the logger module with the RTT enabled as backend (see the ble_app_uart for reference). But the best approach would be to use the debugger and set a breakpoint in the event handler and see if the RX buffer is filled.

regards

Jared

RE: Multiple UART on NRF52833

sne_333 — Tue, 22 Mar 2022 10:03:08 GMT

yes I can check that. Meanwhile If I want to check the received data from other MCU on nrf52833,how can I check if hex data is being received. The libuarte handler is as follow:-

void libuarte_event_handle(void * context, nrf_libuarte_async_evt_t * p_evt)
{
    nrf_libuarte_async_t * p_libuarte = (nrf_libuarte_async_t *)context;
    ret_code_t ret;

    switch (p_evt->type)
    {
        case NRF_LIBUARTE_ASYNC_EVT_ERROR:
            //bsp_board_led_invert(0);
            break;
        case NRF_LIBUARTE_ASYNC_EVT_RX_DATA:
            ret = nrf_libuarte_async_tx(p_libuarte,p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
            if (ret == NRF_ERROR_BUSY)
            {
                buffer_t buf = {
                    .p_data = p_evt->data.rxtx.p_data,
                    .length = p_evt->data.rxtx.length,
                };

                ret = nrf_queue_push(&m_buf_queue, &buf);
                APP_ERROR_CHECK(ret);
            }
            else
            {
                APP_ERROR_CHECK(ret);
            }
            //bsp_board_led_invert(1);
            m_loopback_phase = true;
            break;
        case NRF_LIBUARTE_ASYNC_EVT_TX_DONE:
            if (m_loopback_phase)
            {
                nrf_libuarte_async_rx_free(p_libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
                if (!nrf_queue_is_empty(&m_buf_queue))
                {
                    buffer_t buf;
                    ret = nrf_queue_pop(&m_buf_queue, &buf);
                    APP_ERROR_CHECK(ret);
                    UNUSED_RETURN_VALUE(nrf_libuarte_async_tx(p_libuarte, buf.p_data, buf.length));
                }
            }
           // bsp_board_led_invert(2);
            break;
        default:
            break;
    }
}

Like if I want to print the received data on the RTT terminal, how can I do that?

Regards,

Snehal.

RE: Multiple UART on NRF52833

Jared — Tue, 22 Mar 2022 09:58:48 GMT

Can you use the debugger and see what the transmits functions returns and how the TX buffer that is passed to the function look like?

RE: Multiple UART on NRF52833

sne_333 — Tue, 22 Mar 2022 09:25:24 GMT

Hi Jared,

Unfortunately I am not having scope or analyzer to check the lines.

Regards,

Snehal.

RE: Multiple UART on NRF52833

Jared — Tue, 22 Mar 2022 09:19:26 GMT

Hi,

Do you see any activity on the TX line when you try to send data? Can you use a logical analyzer or a scope and verify?

regards

Jared

RE: Multiple UART on NRF52833

sne_333 — Tue, 22 Mar 2022 06:38:24 GMT

Hi Jared,

I have solved all the errors of libuarte and the code is running properly without any errors. But when I try to transmit hex data from libuarte, i am not able to transmit or receive any data. I am trying to transmit hex data (0x73,0x01,0x0a,0x0d)

What might be the issue?I am not seeing any errors but the other mcu is not receiving any data.

Regards,
Snehal

RE: Multiple UART on NRF52833

Jared — Thu, 03 Mar 2022 09:01:11 GMT

Hi,

If you're using RTOS then only app_timer_freertos.c should be included.

[quote user="snehal_2789"]I actually removed 2 files app_timer2.c and drv_rtc.c and the errors are gone now. But still libuarte gives error while running the code on the device.[/quote]

What kind of error?

I think you should first try to simplify this process into two steps:

Merge the libuarte example with the UART peripheral hardware example and verify that it works.
Add FreeRTOS to your project.

Trying to do both at the same time will unnecessarily complicate things.

regards

Jared

RE: Multiple UART on NRF52833

sne_333 — Wed, 02 Mar 2022 10:32:27 GMT

I am using RTOS in my project. So i have defined some timers which are created in different tasks in RTOS.

RE: Multiple UART on NRF52833

Jared — Wed, 02 Mar 2022 09:29:10 GMT

Hi,

Are you actually using freeRTOS?

[quote user="snehal_2789"] my project as I have to run some timers through schedulers.[/quote]

Please elaborate on this.

regards

Jared

RE: Multiple UART on NRF52833

sne_333 — Wed, 02 Mar 2022 09:24:11 GMT

I solved the issue. I had to put some defines like APP_TIMER_V2 & APP_TIMER_V2_RTC1_ENABLED in the preprocessor definitions.

I am also using "app_timer_freertos.c" in my project as I have to run some timers through schedulers. So the problem is I am getting multiple definition error after including the app_timer2.c.

Any way to solve this issue?

I actually removed 2 files app_timer2.c and drv_rtc.c and the errors are gone now. But still libuarte gives error while running the code on the device.

Thank you.

RE: Multiple UART on NRF52833

sne_333 — Wed, 02 Mar 2022 07:21:11 GMT

I tried to edit the sdk_config according to the file you have provided. Now I am getting new errors.

Please help.

RE: Multiple UART on NRF52833

Jared — Mon, 28 Feb 2022 14:56:02 GMT

Hi,

The SDK config should look somewhat similar to this.

devzone.nordicsemi.com/.../5415.sdk_5F00_config.h

RE: Multiple UART on NRF52833

sne_333 — Fri, 25 Feb 2022 15:05:23 GMT

I disabled this in sdk_config.h. Had enabled it according to our previous discussion. Now again i have disabled it. I have attached my sdk_config file. devzone.nordicsemi.com/.../3566.sdk_5F00_config.h

#ifndef UART1_ENABLED
#define UART1_ENABLED 0
#endif
// <q> UART1_CONFIG_USE_EASY_DMA - Default setting for using EasyDMA

#ifndef UART1_CONFIG_USE_EASY_DMA
#define UART1_CONFIG_USE_EASY_DMA 0
#endif

#ifndef APP_UART_DRIVER_INSTANCE
#define APP_UART_DRIVER_INSTANCE 1
#endif

RE: Multiple UART on NRF52833

Jared — Fri, 25 Feb 2022 14:38:36 GMT

Seems like you already use UARTE1 in your project? Have you already initialized UARTE1 somewhere else in your code?

RE: Multiple UART on NRF52833

sne_333 — Fri, 25 Feb 2022 14:05:40 GMT

Hi Jared,

Thanks for your reply. I followe dyour instructions and did the changes as follows:-

===============================================================================

In sdk_config.h
ADDED LIBUARTE CONFIG



// <q> NRF_LIBUARTE_ASYNC_WITH_APP_TIMER - nrf_libuarte_async - libUARTE_async library

#ifndef NRF_LIBUARTE_ASYNC_WITH_APP_TIMER
#define NRF_LIBUARTE_ASYNC_WITH_APP_TIMER 1
#endif

//==========================================================

// <h> nrf_libuarte_drv - libUARTE library

//==========================================================
// <q> NRF_LIBUARTE_DRV_HWFC_ENABLED - Enable HWFC support in the driver

#ifndef NRF_LIBUARTE_DRV_HWFC_ENABLED
#define NRF_LIBUARTE_DRV_HWFC_ENABLED 0
#endif

// <q> NRF_LIBUARTE_DRV_UARTE0 - UARTE0 instance

#ifndef NRF_LIBUARTE_DRV_UARTE0
#define NRF_LIBUARTE_DRV_UARTE0 0
#endif

// <q> NRF_LIBUARTE_DRV_UARTE1 - UARTE1 instance

#ifndef NRF_LIBUARTE_DRV_UARTE1
#define NRF_LIBUARTE_DRV_UARTE1 1
#endif

// <e> NRF_CLI_LIBUARTE_CONFIG_LOG_ENABLED - Enables logging in the module.
//==========================================================
#ifndef NRF_CLI_LIBUARTE_CONFIG_LOG_ENABLED
#define NRF_CLI_LIBUARTE_CONFIG_LOG_ENABLED 1
#endif
// <o> NRF_CLI_LIBUARTE_CONFIG_LOG_LEVEL - Default Severity level


#ifndef NRF_CLI_LIBUARTE_CONFIG_LOG_LEVEL
#define NRF_CLI_LIBUARTE_CONFIG_LOG_LEVEL 3
#endif

// <o> NRF_CLI_LIBUARTE_CONFIG_INFO_COLOR - ANSI escape code prefix.


#ifndef NRF_CLI_LIBUARTE_CONFIG_INFO_COLOR
#define NRF_CLI_LIBUARTE_CONFIG_INFO_COLOR 0
#endif

// <o> NRF_CLI_LIBUARTE_CONFIG_DEBUG_COLOR - ANSI escape code prefix.


#ifndef NRF_CLI_LIBUARTE_CONFIG_DEBUG_COLOR
#define NRF_CLI_LIBUARTE_CONFIG_DEBUG_COLOR 0
#endif

============================================================================

In uart.c added code for uarte

NRF_LIBUARTE_ASYNC_DEFINE(libuarte, 1, 0, 0, NRF_LIBUARTE_PERIPHERAL_NOT_USED, 255, 3);

typedef struct {
uint8_t * p_data;
uint32_t length;
} buffer_t;

NRF_QUEUE_DEF(buffer_t, m_buf_queue, 10, NRF_QUEUE_MODE_NO_OVERFLOW);

static volatile bool m_loopback_phase;
void sys_uart2_init(void);




void libuarte_event_handle(void * context, nrf_libuarte_async_evt_t * p_evt)
{
nrf_libuarte_async_t * p_libuarte = (nrf_libuarte_async_t *)context;
ret_code_t ret;

switch (p_evt->type)
{
case NRF_LIBUARTE_ASYNC_EVT_ERROR:
bsp_board_led_invert(0);
break;
case NRF_LIBUARTE_ASYNC_EVT_RX_DATA:
ret = nrf_libuarte_async_tx(p_libuarte,p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
if (ret == NRF_ERROR_BUSY)
{
buffer_t buf = {
.p_data = p_evt->data.rxtx.p_data,
.length = p_evt->data.rxtx.length,
};

ret = nrf_queue_push(&m_buf_queue, &buf);
APP_ERROR_CHECK(ret);
}
else
{
APP_ERROR_CHECK(ret);
}
bsp_board_led_invert(1);
m_loopback_phase = true;
break;
case NRF_LIBUARTE_ASYNC_EVT_TX_DONE:
if (m_loopback_phase)
{
nrf_libuarte_async_rx_free(p_libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
if (!nrf_queue_is_empty(&m_buf_queue))
{
buffer_t buf;
ret = nrf_queue_pop(&m_buf_queue, &buf);
APP_ERROR_CHECK(ret);
UNUSED_RETURN_VALUE(nrf_libuarte_async_tx(p_libuarte, buf.p_data, buf.length));
}
}
bsp_board_led_invert(2);
break;
default:
break;
}
}





void sys_uart2_init(void)
{
ret_code_t err_code;

nrf_libuarte_async_config_t nrf_libuarte_async_config = {
.tx_pin = UART2_TX_PIN_NUMBER,
.rx_pin = UART2_RX_PIN_NUMBER,
.baudrate = NRF_UARTE_BAUDRATE_9600,
.parity = NRF_UARTE_PARITY_EXCLUDED,
.hwfc = NRF_UARTE_HWFC_DISABLED,
.timeout_us = 100,
.int_prio = APP_IRQ_PRIORITY_LOW
};

err_code = nrf_libuarte_async_init(&libuarte, &nrf_libuarte_async_config, libuarte_event_handle, (void *)&libuarte);

APP_ERROR_CHECK(err_code);

nrf_libuarte_async_enable(&libuarte);

//err_code = nrf_libuarte_async_tx(&libuarte, text, text_size);
//APP_ERROR_CHECK(err_code);
}

after adding the code i tried to compile and I am getting error: -

How to solve this error?

RE: Multiple UART on NRF52833

Jared — Fri, 25 Feb 2022 09:19:37 GMT

Hi,

You're absolutely right, the app_uart module does not work with multiple instances. It's hardcoded to use UART(E) instance 0. You can use one UART(E) peripheral with app_uart and another UART(E) peripheral with the libUARTE peripheral.

Steps:

Modify the libUARTE example in the SDK so that it uses UARTE instance 1 instead of 0. You can do this by:
1. setting #define NRF_LIBUARTE_DRV_UARTE1 to 1 in the sdk_configh.h file.
2. Initialize UARTE 1 in main.c by NRF_LIBUARTE_ASYNC_DEFINE(libuarte, 1, 0, 0, NRF_LIBUARTE_PERIPHERAL_NOT_USED, 255, 3);
3. Build the example and see if it works as expected.
Merge the modified libuarte example with the app_uart example.
1. Compare the two sdk_config.h files and include everything that is not already included in the app_uart config file. Use the compare option in VS code.
2. Add all project source files and paths that hasn't already been included. See this.
Test the example.

regards

Jared

RE: Multiple UART on NRF52833

sne_333 — Thu, 24 Feb 2022 07:46:03 GMT

Also how will app_uart_put and app_uart_get know which uart to send data from??

RE: Multiple UART on NRF52833

sne_333 — Thu, 24 Feb 2022 07:32:14 GMT

Hi Jared,

I have created new functions for uart2.

//handler for uart1

void uart_event_handle(app_uart_evt_t * p_event)
{
switch (p_event->evt_type)
{
case APP_UART_DATA_READY:
UNUSED_VARIABLE(app_uart_get(&rx_byte));
com_rx_byte(rx_byte);
NRF_LOG_INFO("RECEIVED DATA %x",rx_byte);
break;

case APP_UART_COMMUNICATION_ERROR:
// APP_ERROR_HANDLER(p_event->data.error_communication);
break;

case APP_UART_FIFO_ERROR:
APP_ERROR_HANDLER(p_event->data.error_code);
break;

default:
break;
}
}

//handler for uart2
void uart_2_event_handle(app_uart_evt_t * p_event)
{
switch (p_event->evt_type)
{
case APP_UART_2_DATA_READY:
UNUSED_VARIABLE(app_uart_get(&rx_byte));
com_rx_byte(rx_byte);
NRF_LOG_INFO("RECEIVED DATA %x",rx_byte);
break;

case APP_UART_2_COMMUNICATION_ERROR:
// APP_ERROR_HANDLER(p_event->data.error_communication);
break;

case APP_UART_2_FIFO_ERROR:
APP_ERROR_HANDLER(p_event->data.error_code);
break;

default:
break;
}
}

//initialization for uart1

void sys_uart_init(void)
{
uint32_t err_code;
const app_uart_comm_params_t comm_params =
{
UART_RX_PIN_NUMBER,
UART_TX_PIN_NUMBER,
UART_RTS_PIN_NUMBER,
UART_CTS_PIN_NUMBER,
APP_UART_FLOW_CONTROL_DISABLED,
false,
UART_BAUDRATE_BAUDRATE_Baud9600
};

APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_event_handle,
APP_IRQ_PRIORITY_LOWEST,
err_code);

APP_ERROR_CHECK(err_code);
}

//initialization for uart1

void sys_uart2_init(void)
{
uint32_t err_code;
const app_uart_comm_params_t comm_params =
{
UART_RX_2_PIN_NUMBER,
UART_TX_2_PIN_NUMBER,
UART_RTS_2_PIN_NUMBER,
UART_CTS_2_PIN_NUMBER,
APP_UART_FLOW_CONTROL_DISABLED,
false,
UART_BAUDRATE_BAUDRATE_Baud9600
};

APP_UART_FIFO_INIT(&comm_params,
UART_2_RX_BUF_SIZE,
UART_2_TX_BUF_SIZE,
uart_2_event_handle,
APP_IRQ_PRIORITY_LOWEST,
err_code);

APP_ERROR_CHECK(err_code);
}

Now for receiving and transmitting data through Uart, I have these functions for uart1:-

uint32_t uart_rxByte(uint8_t *byte)
{
return app_uart_get(byte);
}

uint32_t uart_txByte(uint8_t byte)
{
return app_uart_put(byte);
}

Do i need to create the same for uart2 or the same ones can be used?

Thanks & Regards,

Snehal

RE: Multiple UART on NRF52833

Jared — Fri, 18 Feb 2022 13:54:12 GMT

Hi,

Assuming that you're using the UART hardware peripheral example.

You need to add this to the config file:

// <e> UART1_ENABLED - Enable UART1 instance
//==========================================================
#ifndef UART1_ENABLED
#define UART1_ENABLED 1
#endif
// <q> UART1_CONFIG_USE_EASY_DMA  - Default setting for using EasyDMA
 

#ifndef UART1_CONFIG_USE_EASY_DMA
#define UART1_CONFIG_USE_EASY_DMA 1
#endif

// </e>

You also need to repeat the initialization routine that was done for UART0 for UART1. That includes initialize a new FIFO with new RX and TX buffers.

regards

Jared

RE: Multiple UART on NRF52833

sne_333 — Thu, 17 Feb 2022 10:56:54 GMT

Hi Jared,

Thanks for your reply. You mean to say I will have to edit in sdk_config.h from

#ifndef APP_UART_DRIVER_INSTANCE
#define APP_UART_DRIVER_INSTANCE 0
#endif

#ifndef APP_UART_DRIVER_INSTANCE
#define APP_UART_DRIVER_INSTANCE 1
#endif

Will this enable 2 uarts? As well as for uart1 i am using function below:-

APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_event_handle,
APP_IRQ_PRIORITY_LOWEST,
err_code);

APP_ERROR_CHECK(err_code);
}

will i have to creae another function for adding 2nd uart using the same method???

Thanks & Regards,

Snehal

RE: Multiple UART on NRF52833

Jared — Thu, 17 Feb 2022 10:20:16 GMT

Hi,

The nRF52833 has only 1 UART, but 2 UARTE. So you would have to add a UARTE peripheral to your project. To add the peripheral you need to:

Enable the Instance in your sdk config file and add necessary files to your project.
Initialize the peripheral and instance
Use the peripheral 🙂

You can follow the procedure as in the UART example. If you're already using the UART example, then you're actually using the UARTE peripheral. If so, then you need to make sure that you add instance 1 instead of 0, because the example already use instance 0.

regards

Jared