Hi,
I'm stuck with setting up device tree section about the TCA6416 and the associated C code.
the TCA6416 is connected to nrf9160 gpio P0.28 as interrupt active low.
I want to set up pin 2 as output and pin 3 as input (specifically as an interrupt) I would have other pins as interrupt also.
1- would there be a callback per pin or a single callback for all interupt pins (with a switch case) ?
here where I am, and got errors when building
device tree:
&i2c2 {
compatible = "nordic,nrf-twim";
status = "okay";
clock-frequency = <I2C_BITRATE_FAST>;
pinctrl-0 = <&i2c2_default>;
pinctrl-1 = <&i2c2_sleep>;
pinctrl-names = "default", "sleep";
tca6416: tca6416@20 {
compatible = "ti,tca6416";
reg = <0x20>; // I2C address of the TCA6416
#gpio-cells = <2>; // Number of cells for GPIO
gpio-controller;
label = "TCA6416";
reg = <0x20>;
#address-cells = <1>;
#size-cells = <0>;
signal_enable: signal-enable {
gpio-controller;
#gpio-cells = <2>;
gpio-pin = <2 0>; /* Output */
};
signal_detect: signal-detect {
gpio-controller;
#gpio-cells = <2>;
gpio-pin = <3 1>; /* Input */
};
};
};C code:
/* Define the device tree node for the TCA6416 */
#define TCA6416_NAME "TCA6416"
// Define the pin numbers for TAMPER_REARM and TAMPER_DETECT
// #define SIGNAL_ENABLE_PIN 2
// #define SIGNAL_DETECT_PIN 3
#define TCA6416_NODE DT_NODELABEL(tca6416)
#define SIGNAL_ENABLE_PIN DT_GPIO_PIN(TCA6416_NODE, signal_rearm_gpios)
#define SIGNAL_DETECT_PIN DT_GPIO_PIN(TCA6416_NODE, signal_detect_gpios)
void tca6416_init(void)
{
/* Get the GPIO device for the TCA6416 */
struct device *gpio_expander_dev = device_get_binding(TCA6416_NAME);
if (!gpio_expander_dev) {
printk("Failed to get GPIO device\n");
return;
}
gpio_pin_configure(gpio_expander_dev, SIGNAL_ENABLE_PIN , GPIO_OUTPUT_ACTIVE);
gpio_pin_configure(gpio_expander_dev, SIGNAL_DETECT_PIN , GPIO_INPUT);
}much appreciate any help.
