UART does not send data in nRF9160.

[Yusuke]

I want to use UART.

I checked the waveform and UART does not send data.
Here is my code. build and run are successful. Any help?
I connect UART RX and TX directly, which means p16 and p15 are connected by a jumper.

SEGGER IDE V4.16
nrf version: v0.4.0

<main.c>

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

/* nRF9160 DK voltage = 3.0V 
   non sucure
   board name: nrf9160_pca10090ns
   nrf9160_pca10090ns.overlay */

static u8_t uart_buf[1024];

void uart_cb(struct device *x)
{
        printk("uart_cb start!!\n");
	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);
}

void uart_send_str(struct device *uart, char *send_str){
        for (uint8_t i = 0; i < strlen(send_str); i++) {
                uart_poll_out(uart, send_str[i]);
        }
}

void main(void)
{
	struct device *uart_wifi = device_get_binding("UART_1");
        if (!uart_wifi) {
		printk("error\r\n");
	}

	uart_irq_callback_set(uart_wifi, uart_cb);
	uart_irq_rx_enable(uart_wifi);
        char *Cmd = "AT\r\n";
	printk("Start!\n");

	while (1) {
                printk("----loop start!----\n");
                uart_send_str(uart_wifi, Cmd);
		k_cpu_idle();
                k_sleep(2000);
	}
}

<prj.conf>

CONFIG_SERIAL=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
# CONFIG_BSD_LIBRARY_TRACE_ENABLED=n
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_UART_1_NRF_UARTE=y

<nrf9160_pca10090ns.overlay>

&uart1 {
	status = "ok";
	current-speed = <115200>;
	tx-pin = <16>;
	rx-pin = <15>;
};

[Hoang]

Hi yusuke, 

Can you try:

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_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 *uart_send= device_get_binding("UART_1");
        uart_irq_callback_set(uart_send, uart_cb);
	    
        
        
        

	while (1) {
	    
	    printk("testing...\n"); 
		           
        uart_fifo_fill(uart_send, "AT\r" ,sizeof("AT\r"));
        k_sleep(2000);
                
	}
     
	
}

[Yusuke]

Thank you for your reply!

I tested it  but it doesn't release data through UART. I checked the waveform.

This is result. Do you have any advice?

Peripheral              Domain          Status
00 NRF_P0               Non-Secure      OK
01 NRF_CLOCK            Non-Secure      OK
02 NRF_RTC1             Non-Secure      OK
03 NRF_NVMC             Non-Secure      OK
04 NRF_UARTE1           Non-Secure      OK
05 NRF_UARTE2           Secure          SKIP
06 NRF_IPC              Non-Secure      OK
07 NRF_VMC              Non-Secure      OK
08 NRF_FPU              Non-Secure      OK
09 NRF_EGU1             Non-Secure      OK
10 NRF_EGU2             Non-Secure      OK
11 NRF_TWIM2            Non-Secure      OK
12 NRF_SPIM3            Non-Secure      OK
13 NRF_TIMER0           Non-Secure      OK
14 NRF_TIMER1           Non-Secure      OK
15 NRF_TIMER2           Non-Secure      OK
16 NRF_SAADC            Non-Secure      OK
17 NRF_GPIOTE1          Non-Secure      OK

SPM: NS image at 0x8000
SPM: NS MSP at 0x200209a8
SPM: NS reset vector at 0x90f1
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS v1.14.99-ncs1 *****
testing...
testing...
testing...
testing...

[Yusuke]

This works!

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

/* nRF9160 DK voltage = 3.0V 
 * non sucure
 * board name: nrf9160_pca10090ns
 * nrf9160_pca10090ns.overlay */

static u8_t uart_buf[1024];
static K_FIFO_DEFINE(fifo_uart_tx_data);
static K_FIFO_DEFINE(fifo_uart_rx_data);

/********************************************/
void uart_wifi_cb(struct device *x)
{
    printk("uart_wifi_cb\n");
	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\n", uart_buf);
}

void main (void)
{
        struct device *uart_wifi= device_get_binding("UART_1");
        uart_irq_callback_set(uart_wifi, uart_wifi_cb);
        uart_irq_rx_enable(uart_wifi); 

	while (1) {
	    printk("testing...\n");
        uart_fifo_fill(uart_wifi, "AT\r" ,sizeof("AT\r"));
        k_sleep(2000);
                
	}
}

Btw, uart_wifi_cb receives only one character every callback like below. I want a whole characters in one callback. How can I do that?

***** Booting Zephyr OS v1.14.99-ncs1 *****
testing...
uart_wifi_cb
A
uart_wifi_cb
T
uart_wifi_cb

uart_wifi_cb

testing...
uart_wifi_cb
A
uart_wifi_cb
T
uart_wifi_cb

uart_wifi_cb

testing...
uart_wifi_cb
A
uart_wifi_cb
T
uart_wifi_cb

uart_wifi_cb