Hey y'all,
I'm having trouble enabling these pins as GPIO for our custom nrf5340 board, and from reading around, it's not clear to me as a beginner how to properly configure these pins.
Pins P0.0 and P0.1 are usually used to operate an oscillator, but our board doesn't need it and instead these pins should operate as GPIO pins. My understanding is that to enable these pins, I need to operate the chip with the internal oscillator which I can do with the following lines in my proj.conf.
Pins P0.2 and P0.3 are typically used for an NFC antenna, but again, our board doesn't need this functionality and these pins should be configured to be used as GPIO. My understanding is that all I need to do is add the following line to my proj.conf.
I've read that these pins can only be used in a "secure domain", but I've tried creating different projects types (nrf5340dk_nrf5340_cpuapp_ns and nrf5340dk_nrf5340_cpuapp) and running them to no success. There is probably a misunderstanding here on my part. I get the same results as the following link (https://devzone.nordicsemi.com/f/nordic-q-a/94197/config_nfct_pins_as_gpios-y-doesn-t-work). Please direct me to resources to deepen my understanding of a secure domain so I can fix the issue.
Pin P.019 is the most confusing to me. On the dev kit, this pin along with pins P0.20, P0.21, P0.22 are used to make a virtual com port. Other than that though, from the manual, it seems like a normal GPIO pin with no other functionalities. It is unclear to me why this pin is not working. I've done my best to verify that the hardware and connections for this pin on the custom board are working. I'm also unable to toggle this pin on the dev board, despite making the needed physical changes to do so. Is there a setting to enable this particular pin?
If it helps, I'm using VSCode on Ubuntu.
Thanks for the help. I've included the full proj.conf and the overlay file below.
CONFIG_GPIO=y CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n # I2C CONFIG_I2C=y CONFIG_NRFX_TWIM1=y CONFIG_PRINTK=y # Rebooot CONFIG_REBOOT=n CONFIG_RESET_ON_FATAL_ERROR=n CONFIG_NFCT_PINS_AS_GPIOS=y
// To get started, press Ctrl+Space to bring up the completion menu and view the available nodes.
// You can also use the buttons in the sidebar to perform actions on nodes.
// Actions currently available include:
// * Enabling / disabling the node
// * Adding the bus to a bus
// * Removing the node
// * Connecting ADC channels
// For more help, browse the DeviceTree documentation at https://docs.zephyrproject.org/latest/guides/dts/index.html
// You can also visit the nRF DeviceTree extension documentation at https://nrfconnect.github.io/vscode-nrf-connect/devicetree/nrfdevicetree.html
/ {
userpins {
compatible = "gpio-keys";
ex1: ex_1 {
gpios = <&gpio0 20 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 1";
};
ex2: ex_2 {
gpios = <&gpio0 21 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 2";
};
ex3: ex_3 {
gpios = <&gpio0 22 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 3";
};
ex4: ex_4 {
gpios = <&gpio0 23 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 4";
};
ex5: ex_5 {
gpios = <&gpio0 24 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 5";
};
ex6: ex_6 {
gpios = <&gpio0 25 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 6";
};
ex7: ex_7 {
gpios = <&gpio0 26 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 7";
};
ex8: ex_8 {
gpios = <&gpio0 27 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 8";
};
ex9: ex_9 {
gpios = <&gpio0 28 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 9";
};
ex10: ex_10 {
gpios = <&gpio0 29 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 10";
};
ex11: ex_11 {
gpios = <&gpio0 30 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 11";
};
ex12: ex_12 {
gpios = <&gpio0 31 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "External pin 12";
};
enl: en_l {
gpios = <&gpio1 4 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Enable LED Mux";
};
mux0: mux_0 {
gpios = <&gpio1 5 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "LED Mux select 0";
};
mux1: mux_1 {
gpios = <&gpio1 6 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "LED Mux select 1";
};
mux2: mux_2 {
gpios = <&gpio1 7 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "LED Mux select 2";
};
smux0: smux_0 {
gpios = <&gpio1 8 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Stepper Mux select 0";
};
smux1: smux_1 {
gpios = <&gpio1 9 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Stepper Mux select 1";
};
smux2: smux_2 {
gpios = <&gpio1 10 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Stepper Mux select 2";
};
smux3: smux_3 {
gpios = <&gpio1 11 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Stepper Mux select 3";
};
ens: en_s {
gpios = <&gpio1 12 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Enable stepper motors";
};
clks: clk_s {
gpios = <&gpio1 13 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Clock for stepper motors";
};
steps: step_s {
gpios = <&gpio1 14 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Step pin for stepper motors";
};
dirs: dir_s {
gpios = <&gpio1 15 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Dir pin for stepper motors";
};
mmux0: mmux_0 {
gpios = <&gpio0 13 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Misc mux select 0";
};
mmux1: mmux_1 {
gpios = <&gpio0 14 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Misc mux select 1";
};
mmux2: mmux_2 {
gpios = <&gpio0 15 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Misc mux select 2";
};
clkm: clk_m {
gpios = <&gpio0 5 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Clock for miscellaneous";
};
miscm: misc_m {
gpios = <&gpio0 4 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Misc input";
};
lmux0: lmux_0 {
gpios = <&gpio0 16 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Limit mux select 0";
};
lmux1: lmux_1 {
gpios = <&gpio0 17 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Limit mux select 1";
};
lmux2: lmux_2 {
gpios = <&gpio0 18 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Limit mux select 2";
};
lmux3: lmux_3 {
gpios = <&gpio0 19 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Limit mux select 3";
};
lmt: lmt {
gpios = <&gpio0 6 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Limit pin";
};
serv0: serv_0 {
gpios = <&gpio0 0 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Servo 0 pin";
};
serv1: serv_1 {
gpios = <&gpio0 1 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Servo 1 pin";
};
serv2: serv_2 {
gpios = <&gpio0 2 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Servo 2 pin";
};
serv3: serv_3 {
gpios = <&gpio0 3 (GPIO_ACTIVE_HIGH | GPIO_VOLTAGE_3P3)>;
label = "Servo 3 pin";
};
};
};
&i2c1 {
status = "okay";
compatible = "nordic,nrf-twim";
label = "I2C_1";
pinctrl-0 = <&i2c1_default>;
pinctrl-1 = <&i2c1_sleep>;
pinctrl-names = "default", "sleep";
clock-frequency = <100000>;
bh1749: bh1749@38 {
compatible = "rohm,bh1749";
label = "BH1749";
reg = <0x38>;
int-gpios = <&gpio0 27 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
};
tca9548: tca9548a@70 {
compatible = "ti,tca9548a";
label = "TCA9548";
reg = <0x70>;
};
};
&pinctrl {
i2c1_default: i2c1_default{
group1 {
psels = <NRF_PSEL(TWIM_SDA, 0, 35)>,
<NRF_PSEL(TWIM_SCL, 0, 34)>;
};
};
i2c1_sleep: i2c1_sleep{
group1 {
psels = <NRF_PSEL(TWIM_SDA, 0, 35)>,
<NRF_PSEL(TWIM_SCL, 0, 34)>;
low-power-enable;
};
};
};
