From 1b945502afa62d330445dd5206c8ba2272e0c698 Mon Sep 17 00:00:00 2001
From: ThomasAvans <tv.intanker@student.avans.nl>
Date: Sat, 11 May 2024 16:18:03 +0200
Subject: Added software puzzle solve condition

---
 main/puzzle/software/main/main.c | 137 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)

(limited to 'main')

diff --git a/main/puzzle/software/main/main.c b/main/puzzle/software/main/main.c
index c22e0a4..161062e 100644
--- a/main/puzzle/software/main/main.c
+++ b/main/puzzle/software/main/main.c
@@ -1,6 +1,143 @@
 #include <stdio.h>
+#include "driver/gpio.h"
+#include "esp_log.h"
+#include "driver/i2c.h"
+
+#define TAG "SoftwarePuzzle"
+#define I2C_MASTER_NUM I2C_NUM_0
+
+// pins are sorted [up -> down] when looking at the puzzelbox;
+#define TOTAL_VALID 5
+#define INPUT_PINS {}
+#define OUTPUT_PINS {}
+
+typedef enum {
+    UNINITIALIZED = 0U,
+    RESET,
+    PLAYING,
+    SOLVED,
+    ERROR
+} PuzzleState;
+
+PuzzleState state = UNINITIALIZED;
+const char* validCombinations[TOTAL_VALID] = {"11", "22", "33", "44", "55"};
+
+void I2CMasterInit() {
+    i2c_config_t config;
+    config.mode = I2C_MODE_MASTER;
+    config.sda_io_num = I2C_MASTER_SDA_IO;
+    config.sda_pullup_en = GPIO_PULLUP_ENABLE;
+    config.scl_io_num = I2C_MASTER_SCL_IO;
+    config.scl_pullup_en = GPIO_PULLUP_ENABLE;
+    config.master.clk_speed = I2C_MASTER_FREQ_HZ;
+    i2c_param_config(I2C_MASTER_NUM, &conf);
+    i2c_driver_install(I2C_MASTER_NUM, config.mode, 0, 0, 0);
+}
+
+void SendI2CUpdate(PuzzleState state) {
+    uint8_t data;
+    switch (state) {
+        case UNINITIALIZED: data = 0x00; break;
+        case RESET: data = 0x01; break;
+        case PLAYING: data = 0x02; break;
+        case SOLVED: data = 0x03; break;
+        case ERROR: data = 0x04; break;
+        default: data = 0xFF; // Unknown state
+    }
+    ESP_LOGI(TAG, "Sending state %d to main controller via I2C.", state);
+    
+    i2c_cmd_handle_t cmd = i2c_cmd_link_create();
+    i2c_master_start(cmd);
+    i2c_master_write_byte(cmd, (I2C_SLAVE_ADDR << 1) | I2C_MASTER_WRITE, true);
+    i2c_master_write_byte(cmd, data, true);
+    i2c_master_stop(cmd);
+    esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
+    i2c_cmd_link_delete(cmd);
+    
+    if (ret == ESP_OK) {
+        ESP_LOGI(TAG, "State update sent successfully.");
+    } else {
+        ESP_LOGE(TAG, "Failed to send state update via I2C.");
+    }
+}
+
+void SystemInit() {
+    gpio_config_t config;
+
+    // Configure the input row with pull-up
+    config.intr_type = GPIO_INTR_DISABLE;
+    config.mode = GPIO_MODE_INPUT;
+    config.pin_bit_mask = (1ULL << INPUT_PINS[0]) | (1ULL << INPUT_PINS[1]) | (1ULL << INPUT_PINS[2]) | (1ULL << INPUT_PINS[3]);
+    config.pull_down_en = 0;
+    config.pull_up_en = 1;
+    gpio_config(&config);
+
+    // configure the output row
+    config.mode = GPIO_MODE_OUTPUT;
+    config.pin_bit_mask = (1ULL << OUTPUT_PINS[0]) | (1ULL << OUTPUT_PINS[1]) | (1ULL << OUTPUT_PINS[2]);
+    config.pull_down_en = 0;
+    config.pull_up_en = 0;
+    gpio_config(&config);
+}
+
+bool ValidateCombination(const int in, const int out) {
+    for ( int ans = 0; ans < TOTAL_VALID; ans++) {
+        if ( validCombinations[ans][0] == in ) {
+            if ( validCombinations[ans][1] == out )
+                return true;
+        }
+    }
+    return false;
+}
+
+void Update() {
+    bool validCombination = true;
+
+    for ( int outputPin = 0; outputPin < VALID_TOTAL; outputPin++ ){
+        // if a wrong in/out combination was given stop checking
+        if (validCombination == false) {
+            return;
+        }
+
+        // set output pin LOW
+        gpio_set_level(OUTPUT_PINS[outputPin], 0); 
+        for ( int inputPin = 0; inputPin < VALID_TOTAL; intputPin++ ){
+            // check which input is set to LOW
+            if (gpio_get_level(INPUT_PINS[inputPin]) == 0) {
+                // remove message when going into production
+                ESP_LOGI(TAG, "Detected connection between output pin: '%s' and input pin: '%s'", outputPin, inputPin);
+                // check if found connection is valid
+                validCombination = ValidateCombination(inputPin, outputPin);
+            }
+        }
+
+        // set output pin back to HIGH
+        gpio_set_level(OUTPUT_PINS[outputPin], 1); 
+    }
+
+    if ( validCombination == true ) {
+        ESP_LOGI(TAG, "Solved!");
+        send_i2c_update(SOLVED);
+        state = SOLVED;
+    } 
+}
 
 void app_main()
 {
+    I2CMasterInit();
+    SystemInit();
+    ESP_LOGI("App", "GPIO and I2C initialized.");
+    
+    while (state != SOLVED) {
+        if( state == ERROR ) {
+            ESP_LOGE(TAG, "Error: Entered unknown state!");
+            break;
+        }
+
+        // add check if puzzle is active
+        // add request to get puzzle status from main framework
 
+        Update();
+        vTaskDelay(pdMS_TO_TICKS(100)); // Delay to make sure it doesn't spam I2C
+    }
 }
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