UART Communication between nrf52840 and nrf9160 on nrf9160 dk

[smauelGIS]

Hello,

We have an nrf9160 dk-pca10090 board.

We want to know if there is a way to make the two processors (nrf52840 and nrf9160) communicate using uart.

Kindly point us to a sample uart program to achieve this.

Thanks

Regards

[miked531]

I was able to adapt the uart_pipe code (in ncs v1.2 at ./zephyr/drivers/console/uart_pipe.c) with the following changes for the 9160 image:

prj.conf:
CONFIG_UART_PIPE=y
CONFIG_UART_PIPE_ON_DEV_NAME="UART_2"
CONFIG_UART_CONSOLE_LOG_LEVEL_INF=y
### configure the uart between 9160 and 52840
CONFIG_UART_2_NRF_UARTE=y
CONFIG_UART_2_NRF_FLOW_CONTROL=y
CONFIG_UART_INTERRUPT_DRIVEN=y

child_secure_partition_manager.conf:
CONFIG_SPM_NRF_UARTE2_NS=y

nrf9160_pca10090ns.overlay:
/ {
chosen {
zephyr,bt-uart=&uart2;
};
};

&uart2 {
current-speed = <1000000>;
status = "okay";
tx-pin = <18>;
rx-pin = <17>;
rts-pin = <21>;
cts-pin = <19>;
};

And for building the image for the nrf52840:

prj.conf:
CONFIG_UART_PIPE=y
CONFIG_UART_PIPE_ON_DEV_NAME="UART_1"
CONFIG_UART_CONSOLE_LOG_LEVEL_INF=y
CONFIG_UART_1_NRF_UARTE=y
CONFIG_UART_1_NRF_FLOW_CONTROL=y

nrf52840_pca10090.overlay:
/ {
chosen {
zephyr,uart-pipe=&uart1;
};
};

&uart1 {
compatible = "nordic,nrf-uarte";
current-speed = <1000000>;
status = "okay";
tx-pin = <17>;
rx-pin = <20>;
rts-pin = <15>;
cts-pin = <22>;
};

[smauelGIS]

Hello,

We have applied the above, we wrote the code below;

On 52840

#include <zephyr.h>
#include <misc/printk.h>
#include <uart.h>
#include <drivers/console/uart_pipe.h>


static u8_t uart_buf[1024];
static struct device *uart_pipe_dev;
int count = 0;

uart_pipe_recv_cb uart_cb(u8_t *buf, size_t *off){
  printk("received data on 52");
  return (uart_pipe_recv_cb)uart_buf;
}


void main(void)
{
        printk("Started application uart send and read on 52 \n");
       uart_pipe_register(uart_buf,sizeof(uart_buf),uart_cb);
        while (1) {
            count++;
            u8_t* data = &count;            
            int sent = uart_pipe_send(data,sizeof(data));
            if(sent>-1){
              printk("sent data %d, with size %d \n", count,sizeof(data));
            }else{
              printk("Could not send data \n");
            }
            k_sleep(2000);
	}
}

On 9160

#include <zephyr.h>
#include <misc/printk.h>
#include <uart.h>
#include <drivers/console/uart_pipe.h>


static u8_t uart_buf[1024];
static struct device *uart_pipe_dev;
int count = 0;


uart_pipe_recv_cb uart_cb(u8_t *buf, size_t *off){ 
  printk("received \n");
  
  return buf;
}


void main(void)
{
        printk("Started application uart send and read on 91 \n");
       u8_t uart_buf_init;
       uart_pipe_register(&uart_buf_init,sizeof(uart_buf_init),uart_cb);
        while (1) {
            count = count + 1;
            u8_t* data = &count;            
            int sent = uart_pipe_send(data,sizeof(data));
            if(sent>-1){
              printk("sent data %d, with size %d \n", count,sizeof(data));
            }else{
              printk("Could not send data \n");
            }
            k_sleep(2000);
	}
}

however we do not have any communication between 9160 and 52840, specifically from 52840 to 9160.

The only thing we had was a loopback on 9160 when we put a cable from pin P0.17 to P0.18. Could you please share sample code or what specifically we have to do to get this done.

Thanks and Regards

[Sigurd]

Hi,

smauelGIS said:

however we do not have any communication between 9160 and 52840, specifically from 52840 to 9160.

Try setting 

CONFIG_BOARD_PCA10090_INTERFACE0_MCU=y

CONFIG_BOARD_PCA10090_INTERFACE1_MCU=y

in the nRF52840 project. See this link.