How can I send Data from nRF9160 to external module using UART?

[jaydip kavaiya]

Hi all 

I am able to do start loopback using the example of UART.

But how to send data to external modules ( like ESP32) via UART from nRF9160.

I tried this example Thread And also This its working fine and compile also but not send data on UART.

and little beat confused about UART pin configuration How to do that I also use overlay file but actually

what is the pin for RX and TX not understand?  

[Håkon Alseth]

Hi,

 

What pins are you using, and which UARTx are you using? Not all pins are routed to the pin-header on the DK, as they are dedicated for other connections, so a safe choice is to use P0.10 and P0.11 for instance.

Can you share your source code and .overlay file?

 

Kind regards,

Håkon

[jaydip kavaiya]

Hi 

Thanks for your Valuable Replay now I am able to send data to the external module.

There are 2 things I changed [1] rename file nrf9160_pca10090.overlay to nrf9160_pca10090ns.overlay

and [2] also changes pin no. what you suggest like P0.10 as TX and P0.11 as RX so That's Work Thanks

I need a suggestion for 2 things

1. When I receive read data in this uart_fifo_read(x, uart_buf, sizeof(uart_buf)) function and in uart_buf received both data

like A, T,\r,\n and then OK so how can I get only received data like ok.

2. And How can I use uart2 for another second module and what are pins of it

Thanks Again

Jaydip Kavaiya

[Håkon Alseth]

jaydip kavaiya said:

When I receive read data in this uart_fifo_read(x, uart_buf, sizeof(uart_buf)) function and in uart_buf received both data

like A, T,\r,\n and then OK so how can I get only received data like ok.

I do not understand. Can you elaborate on what the issue is? Do you want to do string compare on your received data?

jaydip kavaiya said:

2. And How can I use uart2 for another second module and what are pins of it

Its the exact same procedure, where you define uart2 in your overlay file, and set the wanted GPIOs.

Here's a thread where the configs are posted:

https://devzone.nordicsemi.com/f/nordic-q-a/45166/nrf9160-at_client-sample-default-uart-port/177737#177737

 

Kind regards,

Håkon

[jaydip kavaiya]

Hi Hakon Alseth

Thanks for your kind response

[1] In Which function I get only RX response string (Data)? like I send AT get in only OK Not AT + OK both.

Right now I am getting both string TX and RX in [ uart_buf ] function I want only RX string Data

how can I neglect TX data in this array?

[2] I meant to say how can I use both UART for 2 external modules like 1st is GSM and 2nd is ESP32

Right now I am able to use UART1 in P0.10 and P0.11 for GSM 

and Now How can I use the second UART for ESP32 so what are pins and which UART I use?

Because I use Both UART same time.

[Håkon Alseth]

jaydip kavaiya said:

Right now I am able to use UART1 in P0.10 and P0.11 for GSM 

and Now How can I use the second UART for ESP32 so what are pins and which UART I use?

You need to use one UART for each device. The nRF9160 has 3 UARTs, so you can enable another one.

Its the same procedure as enabling other UART.

Note: CONFIG_BSD_LIBRARY_TRACE_ENABLED should be set to "n" if you plan to use UART1 for the application.

jaydip kavaiya said:

Right now I am getting both string TX and RX in [ uart_buf ] function I want only RX string Data

how can I neglect TX data in this array?

I do not understand. Are you reusing the same buffer for transmitting and receiving? Could you post your code?

 

Kind regards,

Håkon

[jaydip kavaiya]

Hi 

Ok P0.10 and P0.11 already used in first UART.

Can you tell me what are pins safe for second UART like?

And for 2nd Query 

Here is my code

/*
* Copyright (c) 2012-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <zephyr.h>
#include <misc/printk.h>
#include <uart.h>
#include <string.h>
#include <stdlib.h>

static u8_t uart_buf[1024];
static K_FIFO_DEFINE(fifo_uart_tx_data);
static K_FIFO_DEFINE(fifo_uart_rx_data);
struct uart_data_t {
	void  *fifo_reserved;
	u8_t    data[1024];
	u16_t   len;
};

void uart_sendCOM(struct device *x,  u8_t *Cont)
{
	       
         u16_t len = strlen(Cont); 
         uart_fifo_fill(x, Cont,len );
         uart_irq_tx_enable(x);
         
    
}
void uart_cb(struct device *x)
{
	uart_irq_update(x);
	int data_length = 0;

	if (uart_irq_rx_ready(x)) {
                data_length = uart_fifo_read(x, uart_buf, sizeof(uart_buf));
		uart_buf[data_length] = 0;
	}
	printk("%s", uart_buf);

       	if (uart_irq_tx_ready(x)) {
               
        	struct uart_data_t *buf =
			k_fifo_get(&fifo_uart_tx_data, K_NO_WAIT);
		u16_t written = 0;

		/* Nothing in the FIFO, nothing to send */
		if (!buf) {
			uart_irq_tx_disable(x);
			return;
		}

		while (buf->len > written) {
			written += uart_fifo_fill(x,
						  &buf->data[written],
						  buf->len - written);
		}

		while (!uart_irq_tx_complete(x)) {
			/* Wait for the last byte to get
			 * shifted out of the module
			 */
		}

		if (k_fifo_is_empty(&fifo_uart_tx_data)) {
			uart_irq_tx_disable(x);
		}

		k_free(buf);
	
		
	}

       
}

void main(void)
{
	
        struct device *uart1 = device_get_binding("UART_1");
       
        uart_irq_rx_enable(uart1);
        uart_irq_callback_set(uart1, uart_cb);
        k_sleep(3000);
        uart_sendCOM(uart1,"AT+CMGF=1\r\n");
        k_sleep(3000);
        uart_sendCOM(uart1,"AT+CMGS=\"xxxxxxxxxx\"\r\n"); //Mobile no. 9xxxxxxxxx
        k_sleep(3000);
        uart_sendCOM(uart1,"\rCall and SMS both\r\n");
        k_sleep(3000);
        uart_sendCOM(uart1,"\x1A");
        k_sleep(3000);
        
        
        while(1);

}
        

So in This code 

if (uart_irq_rx_ready(x)) {
data_length = uart_fifo_read(x, uart_buf, sizeof(uart_buf));
uart_buf[data_length] = 0;
}

in this function on [ uart_buf ] received both TX and RX string data

how can i received only RX data.

Right now i am receiving like A,T,+,C,M,G,F,=,1,\r,\n and O,K also

I only need O, K so that is an issue.

[Håkon Alseth]

jaydip kavaiya said:

Ok P0.10 and P0.11 already used in first UART.

Can you tell me what are pins safe for second UART like?

 All unused GPIOs are safe to use, but on the DK, there are some pins that overlap with others, and are not routed out on the pin list.

Here's the documentation on GPIOs:

https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/if_connector.html?cp=2_0_4_3_5

Try to use P0.12 and P0.13 for the next uart. 

 

jaydip kavaiya said:

in this function on [ uart_buf ] received both TX and RX string data

how can i received only RX data.

Right now i am receiving like A,T,+,C,M,G,F,=,1,\r,\n and O,K also

 Are you certain that the external module isn't echo'ing back the command with the status? you can use standard string functions to delimit the string. I would recommend reading up on the standard functions provided in string.h:

https://en.wikibooks.org/wiki/C_Programming/String_manipulation

 

Kind regards,

Håkon