init i2c

main/main.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include "driver/i2c_master.h"
+
+#define I2C_SCL 1 /*FIXME*/
+#define I2C_SDA 2
+
+/* Docs: https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf */
+#define DISP_ADDRESS 0X3c
+#define I2C_FREQ 100000
+
+static i2c_master_dev_handle_t disp_handle;
+
+void init_i2c(void){
+    i2c_master_bus_config_t i2c_mst_config = {
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .i2c_port = I2C_PORT_NUM_0,
+        .scl_io_num = I2C_SCL,
+        .sda_io_num = I2C_SDA,
+        .glitch_ignore_cnt = 7,
+        .flags.enable_internal_pullup = true,
+    };
+
+    i2c_master_bus_handle_t bus_handle;
+    ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &bus_handle));
+
+    i2c_device_config_t dev_cfg = {
+        .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+        .device_address = DISP_ADDRESS,
+        .scl_speed_hz = I2C_FREQ,
+    };
+
+    ESP_ERROR_CHECK(i2c_master_bus_add_device(bus_handle, &dev_cfg, &disp_handle));
+
+
+}
+
+void i2c_disp_send_cmd(uint8_t cmd){
+    uint8_t data[2] = {0x00, cmd}; /*command mode*/
+    ESP_ERROR_CHECK(
+        i2c_master_transmit(disp_handle, data, sizeof(data), -1)
+    );
+}
+
+void init_display(void){
+
+}
+
+void app_main(void){
+    init_i2c();
+
+}