To create an I2C device, first call i2c_init, passing in an i2c_config_t struct. This struct defines the SCL/SDA pins, the I2C device address, and the connect/read/write/disconnect callbacks.
Initializes an I2C device. The config argument defines the pins, address, and callbacks for the I2C device. It contains the following fields:
All the callbacks (connect, read, write, disconnect) are optional. They all use the user_data pointer as their first argument.
bool on_i2c_connect(void *user_data, uint32_t address, bool read) {
return true;
}
uint8_t on_i2c_read(void *user_data) {
return 0;
}
bool on_i2c_write(void *user_data, uint8_t data) {
return true;
}
void on_i2c_disconnect(void *user_data) {
}
static const i2c_config_t i2c1 {
.address = 0x22,
.scl = pin_init("SCL", INPUT_PULLUP),
.sda = pin_init("SDA", INPUT_PULLUP),
.connect = on_i2c_connect,
.read = on_i2c_read,
.write = on_i2c_write,
.disconnect = on_i2c_disconnect,
.user_data = chip,
};
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