Please help me modify this serial routine to resolve the problem of unstable data sending and receiving.

[peter.min]

Use this routine to send and receive data from 4 different serials, receive and send data loss, please help me modify this sample bug.

sdk ncs v1.3
Path:D:\ncs\v1.3.0\nrf\samples\nrf9160\spm\prj.conf
Filename:prj.conf
Modify:CONFIG_SERIAL=n

Path:D:\ncs\v1.3.0\zephyr\boards\arm\nrf9160dk_nrf9160\nrf9160dk_nrf9160_common.dts
Filename:nrf9160dk_nrf9160_common.dts
Modify:Replace this dts file with the provided sample dtc file.    nrf9160dk_nrf9160_common.dts

Path:D:\ncs\v1.3.0\nrf\applications\21_uart_x4
Storage example:21_uart_x4

0160.4uart_example.rar

[Hakon]

Hello,

can you describe the problem you're experiencing? What do you mean by unstable data sending and receiving?

[peter.min]

Hi HåkonHardy Lier,

1. Have you ever tested your serial communication?
2.Can you test the code I gave you?
3. Is this kind of error easy to encounter?
4. The most common errors are as follows:

Kind regards. Peter.Min

[Hakon]

In main.c you are using uart_buf for all the uart instances. Have you tried using a separate buffer for each of them?

[peter.min]

Hi Håkon Hardy Lier,

I try to use multiple bufs
The test results are still consistent with the original phenomenon

/*

* Copyright (c) 2012-2014 Wind River Systems, Inc.

*

* SPDX-License-Identifier: Apache-2.0

*/
#include <zephyr.h>
#include <sys/printk.h>
#include <drivers/uart.h>
#include <string.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(uart, 3);

static u8_t uart_buf[4][256];
struct device *uart0 = NULL;
struct device *uart1 = NULL;
struct device *uart2 = NULL;
struct device *uart3 = NULL;

void uart0_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[0], sizeof(uart_buf[0]));
        uart_buf[0][data_length] = 0;
        uart_fifo_fill( x, uart_buf[0], strlen(uart_buf[0]) );
    }
}

void uart1_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[1], sizeof(uart_buf[1]));
        uart_buf[1][data_length] = 0;
        uart_fifo_fill( x, uart_buf[1], strlen(uart_buf[1]) );
    }
}

void uart2_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[2], sizeof(uart_buf[2]));
        uart_buf[2][data_length] = 0;
        uart_fifo_fill( x, uart_buf[2], strlen(uart_buf[2]) );
    }
}

void uart3_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[3], sizeof(uart_buf[3]));
        uart_buf[3][data_length] = 0;
        uart_fifo_fill( x, uart_buf[3], strlen(uart_buf[3]) );
    }
}

void main(void)
{
    uart0 = device_get_binding("UART_0");
    uart1 = device_get_binding("UART_1");
    uart2 = device_get_binding("UART_2");
    uart3 = device_get_binding("UART_3");

    uart_irq_callback_set(uart0, uart0_cb);
    uart_irq_rx_enable(uart0);
    
    uart_irq_callback_set(uart1, uart1_cb);
    uart_irq_rx_enable(uart1);
    
    uart_irq_callback_set(uart2, uart2_cb);
    uart_irq_rx_enable(uart2);

    uart_irq_callback_set(uart3, uart3_cb);
    uart_irq_rx_enable(uart3);
    
    LOG_INF("uart init");
    while (1) 
    {
        //k_cpu_idle();
        LOG_INF("Hello World!\n");
        k_sleep( Z_TIMEOUT_MS(8000) );
    }
}

Kind regards. Peter.Min

[Hakon]

How do you test all four uarts at once? The nrf9160 has three VCOM ports, so how do you test the last uart?