75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#ifndef I2C_H
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#define I2C_H
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#define I2C_BUS_PORT 0
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#include <driver/i2c_master.h>
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/**
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* Encapsulates ESP I2C creation and usage.
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*/
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struct I2C {
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/**
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* Construct and initialize an ESP I2C master bus.
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* An I2C constructor may only be called one time in any application.
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*
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* @param sda GPIO pin number for SDA
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* @param scl GPIO pin number for SCL
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* @param rst GPIO pin number for RST
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*/
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I2C(gpio_num_t sda, gpio_num_t scl, int rst = -1) :
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I2C((i2c_master_bus_config_t) {
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.i2c_port = I2C_BUS_PORT,
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.sda_io_num = sda,
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.scl_io_num = scl,
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.clk_source = I2C_CLK_SRC_DEFAULT,
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.glitch_ignore_cnt = 7,
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.flags {
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.enable_internal_pullup = true,
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},
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},
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rst
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) { }
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/**
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* Construct an ESP I2C master bus given a specific ESP I2C configuration.
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* An I2C constructor may only be called one time in any application.
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*
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* @param config ESP I2C master bus configuration.
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* @param rst GPIO pin number for RST
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*/
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explicit I2C(i2c_master_bus_config_t config, int rst = -1) :
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esp_bus_config_(config),
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rst_num_(rst)
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{
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i2c_master_bus_handle_t i2c;
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ESP_LOGI(TAG, "Initializing new master I2C bus");
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ESP_ERROR_CHECK(i2c_new_master_bus(&esp_bus_config_, &i2c));
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}
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~I2C() = default;
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/**
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* ESP I2C master bus handle getter.
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* This will fail if an I2C instance was never constructed.
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*/
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static i2c_master_bus_handle_t get()
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{
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i2c_master_bus_handle_t i2c = nullptr;
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ESP_ERROR_CHECK(i2c_master_get_bus_handle(0, &i2c));
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return i2c;
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}
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/// ESP I2C master bus configuration used during initialization.
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i2c_master_bus_config_t esp_bus_config_;
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/// RST GPIO pin number.
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int rst_num_;
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private:
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/// Tag used for ESP logging.
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const char * TAG = "I2C";
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};
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#endif //I2C_H
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