nRF9160 DK : activating GPIO

Question

Hello,

I have been working to manipulate GPIO.

I succeeded to turn on and off P0.02 ~ P0.05 (LED 1~4). However, I cannot get P0.00 and P0.01 to get work.

GPIO IN seems to work because I looped back the 5V and I get 1 as a result but GPIO OUT doesn't work at all.

I measured with a multimeter but it mesaures no voltage.

I referenced to following examples and Q&A:

https://devzone.nordicsemi.com/f/nordic-q-a/43774/simple-gpio-example---nrf9160-dk

https://devzone.nordicsemi.com/f/nordic-q-a/44940/simple-gpio-example---nrf9160-dk-2

I added my project to the git, please take a look at it if you need more reference to help me.

https://github.com/CerfVert94/nRF9160-GPIO

I added the following lines to KConfig.deconfig :

config GPIO
    bool
    default y
    depends on SPI && SOC_FAMILY_NRF

I commented out uart1 that uses pin P0.00 and P0.01 in nrf9160_pca10090_common.dts; just in case.

/*
&uart1 {
   status = "ok";
   current-speed = <115200>;
   tx-pin = <1>;
   rx-pin = <0>;
   rts-pin = <14>;
   cts-pin = <15>;
};
*/

I use the non-secure boot, so added nrf9160_pca10090ns.overlay file, which contains the following lines :

&spi3 {
   status = "ok";
   sck-pin = <10>;
   mosi-pin = <11>;
   miso-pin = <12>;
   ss-pin = <13>;
   spi-max-frequency = <4000000>;
};

All these config / overlay files are in path/ncs/nrf/applications/MY_PROJECT/ , where CMakeLists.txt is located.

The following is my code :

static void gpio_init(void)
{
const char* const gpioName = "GPIO_0";
gpio_dev = device_get_binding(gpioName);

if (gpio_dev == NULL) {
    printk("Could not get %s device\n", gpioName);
    return;
}
printk("Successfully initialised %s device\n", gpioName);

if(gpio_pin_configure(gpio_dev, PIN1, GPIO_DIR_OUT) < 0)
    printk("Could not configure pin P0.%02d\n", PIN1);
if(gpio_pin_configure(gpio_dev, PIN2, GPIO_DIR_OUT ) < 0)
    printk("Could not configure pin P0.%02d\n", PIN2);
}
static void spi_init(void)
{
const char* const spiName = "SPI_3";
spi_dev = device_get_binding(spiName);

if (spi_dev == NULL) {
    printk("Could not get %s device\n", spiName);
    return;
}
printk("Successfully initialised %s device\n", spiName);
}
void main(void)
{
printk("Application started\n");
gpio_init();

spi_init();
      if (!gpio_pin_write(gpio_dev, PIN1, 1))
        printf("1. P0.%02d : write 1\n", PIN1);
      if (!gpio_pin_write(gpio_dev, PIN2, 1))
        printf("2. P0.%02d : write 1\n", PIN2);
while(1);
}

I want to manipulate Chip Select signal during SPI communication but I can't manipulate GPIO ... could you help me, please?

Simon · Accepted Answer

I tested your example, and it worked as expected. (I modified your project slightly by removing target_sources (app PRIVATE src/SD.c) from CMakeListst.txt). 
 I measured 1.79 volt across both P0.00 and P0.01 with a multimeter. I also connected an external LED in series with a resistor and was able to light it up. 
 Are you sure you have configured the multimeter correctly? Could you try to attach an LED+resistor and check the results. If it you still have problems, please tell me, and I will look into it. 
 Best regards, 
 Simon

nRF9160 DK : activating GPIO

Top Replies