Custom Board based on nRF9160 + GPIO Pin Mapping problem

Question

Hello,
I'm trying to map custom PIN mapping on my prototype board, based on nRF9160 DK.

I had to remove the UART0 pins and map them for my purpose, but when I'm trying to configure the pins:

int LED_RED = 28;
int LED_GREEN = 30;

int initializeDiode1 = gpio_pin_configure(gpio_dev, LED_RED, GPIO_DIR_OUT);
int initializeDiode2 = gpio_pin_configure(gpio_dev, LED_GREEN, GPIO_DIR_OUT);

and set their state to HIGH

gpio_pin_write(gpio_dev, LED_RED, 1);
gpio_pin_write(gpio_dev, LED_GREEN, 1);

Only the PIN number 30 actually create Voltage on output, but not the 28th.

Can you help me with that?
Thank you

DevinCallahan · Answer

I think my initial answer was wrong about how to fix this. What you want is to assign different pins to UART0 through the Device Tree. We can do that with an overlay file. Create a file called exactly "nrf9160_pca10090ns.overlay" in the project source directory (at the same level as CMakeLists.txt). It must be exactly ".overlay" because the zephyr build process uses the board name when searching this for file in your project directory. I know that is has found my overlay file because the initial west build will dump something like this to the console: -- Loading ~/zephyr/boards/arm/nrf9160_pca10090/nrf9160_pca10090ns.dts as base -- Overlaying ~/zephyr/dts/common/common.dts -- Overlaying ~/nrf/experiment/shell_test/nrf9160_pca10090ns.overlay In the .overlay file define this. Pick which pins you want to move the UART to (I chose 10-13 because those just happen to be free pins on the dev-kit): &uart0 { tx-pin = <10>; rx-pin = <11>; rts-pin = <12>; cts-pin = <13>; }; This will modify the pins that get assigned. You can verify this by looking at the header file the device tree system generates at: "build/zephyr/include/generated/generated_dts_board_unfixed.h" Before adding the overlay I get these definitions (which match the default config): #define DT_NORDIC_NRF_UARTE_40008000_CTS_PIN 26 #define DT_NORDIC_NRF_UARTE_40008000_RTS_PIN 27 #define DT_NORDIC_NRF_UARTE_40008000_RX_PIN 28 #define DT_NORDIC_NRF_UARTE_40008000_TX_PIN 29 After adding the overlay I get these definitions: #define DT_NORDIC_NRF_UARTE_40008000_CTS_PIN 13 #define DT_NORDIC_NRF_UARTE_40008000_RTS_PIN 12 #define DT_NORDIC_NRF_UARTE_40008000_RX_PIN 11 #define DT_NORDIC_NRF_UARTE_40008000_TX_PIN 10

Custom Board based on nRF9160 + GPIO Pin Mapping problem

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