Initial commit

src/i2c.c

@@ -0,0 +1,46 @@
+/**
+ * @file i2c.c
+ * @author marisa (marisa@fwmari.net)
+ * @brief
+ * @version 0.1
+ * @date 2024-05-06
+ *
+ * @copyright Copyright (c) 2024
+ *
+ */
+
+#include "i2c.h"
+
+i2c_master_bus_handle_t m_handle = NULL;
+
+static bool busInitialized = false;
+
+i2c_master_bus_handle_t i2cInitMasterBus(uint8_t sda, uint8_t scl) {
+  i2c_master_bus_config_t i2cMasterConfig = {
+      .clk_source                   = I2C_CLK_SRC_DEFAULT,
+      .i2c_port                     = I2C_NUM_0,
+      .scl_io_num                   = scl,
+      .sda_io_num                   = sda,
+      .glitch_ignore_cnt            = 7,
+      .flags.enable_internal_pullup = true,
+  };
+
+  ESP_ERROR_CHECK(i2c_new_master_bus(&i2cMasterConfig, &m_handle));
+  busInitialized = true;
+  return m_handle;
+}
+
+i2c_master_dev_handle_t i2cInitDevice(uint8_t addr, uint32_t speed) {
+  assert(busInitialized);
+
+  i2c_device_config_t deviceCfg = {
+      .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+      .device_address  = addr,
+      .scl_speed_hz    = speed,
+  };
+
+  i2c_master_dev_handle_t devHandle;
+  ESP_ERROR_CHECK(i2c_master_bus_add_device(m_handle, &deviceCfg, &devHandle));
+
+  return devHandle;
+}