esp32-timer/app/src/odroid/input.c

#include "input.h"
#include <driver/adc.h>
#include <driver/gpio.h>
#include <esp_log.h>
#include <soc/adc_channel.h>


static const char* LOG_TAG = "OdroidInput";

const gpio_num_t BUTTON_PIN_A = GPIO_NUM_32;
const gpio_num_t BUTTON_PIN_B = GPIO_NUM_33;
const gpio_num_t BUTTON_PIN_START = GPIO_NUM_39;
const gpio_num_t BUTTON_PIN_SELECT = GPIO_NUM_27;
const gpio_num_t BUTTON_PIN_VOLUME = GPIO_NUM_0;
const gpio_num_t BUTTON_PIN_MENU = GPIO_NUM_13;
const adc1_channel_t DPAD_PIN_X_AXIS = ADC1_GPIO34_CHANNEL;
const adc1_channel_t DPAD_PIN_Y_AXIS = ADC1_GPIO35_CHANNEL;


void Odroid_InitializeInput()
{
	// Configure digital buttons
	{
		gpio_config_t gpioConfig = {};

		gpioConfig.mode = GPIO_MODE_INPUT;
		gpioConfig.pull_up_en = GPIO_PULLUP_ENABLE;
		gpioConfig.pin_bit_mask =
			  (1ULL << BUTTON_PIN_A)
			| (1ULL << BUTTON_PIN_B)
			| (1ULL << BUTTON_PIN_START)
			| (1ULL << BUTTON_PIN_SELECT)
			| (1ULL << BUTTON_PIN_VOLUME)
			| (1ULL << BUTTON_PIN_MENU);

		ESP_ERROR_CHECK(gpio_config(&gpioConfig));

		ESP_LOGI(LOG_TAG, "Buttons initialized");
	}

	// Configure analog d-pad
	{
		ESP_ERROR_CHECK(adc1_config_width(ADC_WIDTH_BIT_12));
		ESP_ERROR_CHECK(adc1_config_channel_atten(DPAD_PIN_X_AXIS,ADC_ATTEN_DB_11));
		ESP_ERROR_CHECK(adc1_config_channel_atten(DPAD_PIN_Y_AXIS,ADC_ATTEN_DB_11));

		ESP_LOGI(LOG_TAG, "D-pad initialized");
	}
}

Odroid_Input Odroid_PollInput(void)
{
	Odroid_Input input = {};


	const uint32_t ADC_HIGH_LEVEL = 3072; // 75% of 12-bit (4096) range
	const uint32_t ADC_LOW_LEVEL = 1024; // 25% of 12-bit (4096) range


	{
		uint32_t dpadX = adc1_get_raw(DPAD_PIN_X_AXIS);

		if (dpadX > ADC_HIGH_LEVEL)
		{
			input.left = 1;
		}
		else if (dpadX > ADC_LOW_LEVEL)
		{
			input.right = 1;
		}
	}


	{
		uint32_t dpadY = adc1_get_raw(DPAD_PIN_Y_AXIS);

		if (dpadY > ADC_HIGH_LEVEL)
		{
			input.up = 1;
		}
		else if (dpadY > ADC_LOW_LEVEL)
		{
			input.down = 1;
		}
	}


	// Buttons are pulled up so must invert
	input.a = !gpio_get_level(BUTTON_PIN_A);
	input.b = !gpio_get_level(BUTTON_PIN_B);
	input.select = !gpio_get_level(BUTTON_PIN_SELECT);
	input.start = !gpio_get_level(BUTTON_PIN_START);
	input.menu = !gpio_get_level(BUTTON_PIN_MENU);
	input.volume = !gpio_get_level(BUTTON_PIN_VOLUME);


	return input;
}

void Odroid_PrintInputState(Odroid_Input* input)
{
	bool inputSet = false;
	if (input->a)
	{
		inputSet = true;
		printf("a ");
	}
	if (input->b)
	{
		inputSet = true;
		printf("b ");
	}
	if (input->volume)
	{
		inputSet = true;
		printf("volume ");
	}
	if (input->menu)
	{
		inputSet = true;
		printf("menu ");
	}
	if (input->select)
	{
		inputSet = true;
		printf("select ");
	}
	if (input->start)
	{
		inputSet = true;
		printf("start ");
	}
	if (input->left)
	{
		inputSet = true;
		printf("left ");
	}
	if (input->right)
	{
		inputSet = true;
		printf("right ");
	}
	if (input->up)
	{
		inputSet = true;
		printf("up ");
	}
	if (input->down)
	{
		inputSet = true;
		printf("down ");
	}

	if (inputSet)
		printf("\n");
}

int Odroid_HasAnyInput(Odroid_Input* input)
{
	if (input->a)
		return true;
	if (input->b)
		return true;
	if (input->volume)
		return true;
	if (input->menu)
		return true;
	if (input->select)
		return true;
	if (input->start)
		return true;
	if (input->left)
		return true;
	if (input->right)
		return true;
	if (input->up)
		return true;
	if (input->down)
		return true;

	return false;
}