From f2c4b15c72a2fa89caed5d8a11a4ea9832c48be6 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Mon, 18 May 2026 22:44:37 +0530
Subject: feat: add AXS15231B touch driver with coordinate parsing tests

---
 main/touch.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 main/touch.c

(limited to 'main/touch.c')

diff --git a/main/touch.c b/main/touch.c
new file mode 100644
index 0000000..5a1eec9
--- /dev/null
+++ b/main/touch.c
@@ -0,0 +1,131 @@
+#include "touch.h"
+#include "esp_log.h"
+#include "driver/i2c_master.h"
+#include "driver/gpio.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include <string.h>
+
+static const char *TAG = "touch";
+
+static i2c_master_bus_handle_t s_bus = NULL;
+static i2c_master_dev_handle_t s_dev = NULL;
+static bool s_initialized = false;
+
+static const uint8_t s_read_cmd[11] = {
+    0xb5, 0xab, 0xa5, 0x5a, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00
+};
+
+void touch_parse_raw(const uint8_t *data, touch_point_t *pt) {
+    memset(pt, 0, sizeof(*pt));
+
+    if (!data || data[0] != 0 || data[1] == 0 || data[1] > 1) {
+        pt->touched = false;
+        return;
+    }
+
+    uint16_t raw_x = ((data[2] & 0x0F) << 8) | data[3];
+    uint16_t raw_y = ((data[4] & 0x0F) << 8) | data[5];
+
+    if (raw_x > TOUCH_MAX_X) raw_x = TOUCH_MAX_X;
+    if (raw_y > TOUCH_MAX_Y) raw_y = TOUCH_MAX_Y;
+
+    pt->x = raw_x;
+    pt->y = raw_y;
+    pt->touched = true;
+}
+
+esp_err_t touch_init(void) {
+    if (s_initialized) return ESP_OK;
+
+    gpio_config_t rst_conf = {
+        .pin_bit_mask = (1ULL << TOUCH_RST_PIN),
+        .mode = GPIO_MODE_OUTPUT,
+        .pull_up_en = GPIO_PULLUP_DISABLE,
+        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .intr_type = GPIO_INTR_DISABLE,
+    };
+    gpio_config(&rst_conf);
+
+    gpio_set_level(TOUCH_RST_PIN, 0);
+    vTaskDelay(pdMS_TO_TICKS(200));
+    gpio_set_level(TOUCH_RST_PIN, 1);
+    vTaskDelay(pdMS_TO_TICKS(200));
+
+    i2c_master_bus_config_t bus_cfg = {
+        .i2c_port = I2C_NUM_0,
+        .sda_io_num = TOUCH_SDA_PIN,
+        .scl_io_num = TOUCH_SCL_PIN,
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .glitch_ignore_cnt = 7,
+        .intr_priority = 0,
+        .trans_queue_depth = 0,
+        .flags = {
+            .enable_internal_pullup = 1,
+            .allow_pd = 0,
+        },
+    };
+
+    esp_err_t ret = i2c_new_master_bus(&bus_cfg, &s_bus);
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to create I2C bus: %s", esp_err_to_name(ret));
+        return ret;
+    }
+
+    i2c_device_config_t dev_cfg = {
+        .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+        .device_address = TOUCH_I2C_ADDR,
+        .scl_speed_hz = 400000,
+        .scl_wait_us = 0,
+        .flags = {
+            .disable_ack_check = 0,
+        },
+    };
+
+    ret = i2c_master_bus_add_device(s_bus, &dev_cfg, &s_dev);
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to add I2C device: %s", esp_err_to_name(ret));
+        i2c_del_master_bus(s_bus);
+        s_bus = NULL;
+        return ret;
+    }
+
+    s_initialized = true;
+    ESP_LOGI(TAG, "Touch initialized (I2C addr 0x%02X)", TOUCH_I2C_ADDR);
+    return ESP_OK;
+}
+
+bool touch_read(touch_point_t *pt) {
+    if (!s_initialized || !s_dev || !pt) {
+        if (pt) pt->touched = false;
+        return false;
+    }
+
+    esp_err_t ret = i2c_master_transmit(s_dev, s_read_cmd, sizeof(s_read_cmd), 100);
+    if (ret != ESP_OK) {
+        pt->touched = false;
+        return false;
+    }
+
+    uint8_t data[8] = {0};
+    ret = i2c_master_receive(s_dev, data, sizeof(data), 100);
+    if (ret != ESP_OK) {
+        pt->touched = false;
+        return false;
+    }
+
+    touch_parse_raw(data, pt);
+    return pt->touched;
+}
+
+void touch_deinit(void) {
+    if (s_dev) {
+        i2c_master_bus_rm_device(s_dev);
+        s_dev = NULL;
+    }
+    if (s_bus) {
+        i2c_del_master_bus(s_bus);
+        s_bus = NULL;
+    }
+    s_initialized = false;
+}
-- 
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