Nau88c22-driver: Professional Audio CODEC Solution

Hello! If you're developing audio-based embedded systems, meet a solution that will take your project to the next level: the Nau88c22-driver.

This project provides a simple, modular, and reliable C-based driver framework for high-quality audio CODEC integration.

🔧 Project Purpose & Benefits

The project includes a driver software that provides direct access to the NAU88C22 audio CODEC. This allows you to easily manage audio streams—stereo, speaker, or headphone output—in microcontroller-based systems.

The driver design is kept simple: register-based control over the basic I²C interface; if necessary, it can be extended with higher-level I²S configuration and code additions. This makes it a suitable solution even for embedded and resource-constrained devices.

GitHub

Shared with an open source approach; It can be freely used as a reference or modified—providing flexibility for both industrial and hobby/research projects.

📦 Who is it Suitable For?

Lightweight, Modular and Embedded System-Oriented Driver for NAU88C22 Audio CODEC

This project is an open-source driver package for the NAU88C22 stereo audio CODEC.
The goal is to simplify the use of the NAU88C22 in microcontroller-based projects, provide a clean API, and simplify low-level register management.

This driver is compatible with ARM-based MCUs (STM32, RP2040, ESP32-S3, etc.) and provides a functional basis such as CODEC register control over I²C , working with the I²S/SAI audio interface , and headphone/speaker output management .

✨ Features

✔ Simple API for NAU88C22 register map
✔ Full control over I²C (read/write)
✔ Speaker, headphone, DAC, ADC configuration functions
✔ Compatible with I2S/SAI audio interface
✔ Lightweight, minimal design
✔ Modular and expandable

📁 Project Structure

Nau88c22-driver/
│
├── src/
│   ├── nau88c22.c
│   └── nau88c22.h
│
├── examples/
│   └──	io.c       # Örnek kullanım
│
└── README.md

🚀 Start / Integration

1️⃣ Include Files in Your Project

nau88c22.c and nau88c22.h add the files to the project directory.

2️⃣ Implement I²C Functions

The driver expects the following two functions to be provided by the platform:

c
extern void i2c_write_reg(uint8_t devAddr, uint16_t reg, uint16_t data);
extern uint16_t i2c_read_reg(uint8_t devAddr, uint16_t reg);

STM32 HAL sample application:

c
uint8_t write_bus(uint8_t reg, uint16_t data){
	/*uint16_t datas = (reg & 0x7) | ((data<<7) & 0x1ff);
	uint8_t _data[3];
	memcpy(_data, &datas, sizeof(uint16_t));
	return  _write_spi_bus(_data);*/
	reg = (reg<<1) | ((data >> 8) & 0x01);
	uint8_t senddata[1] = {data & 0xff};
	//return HAL_I2C_Mem_Write(&hi2c2, NAU_DEV_ID<<1, reg, 1, senddata, 1, 1000);
	//return HAL_I2C_Mem_Write(&hi2c2, NAU_DEV_ID<<1, reg, 1, senddata, 1, 1000);
	return !I2C_Write(NAU_DEV_ID, reg, senddata, 1, 10);
}

//3 write not use;
uint8_t read_bus(uint8_t reg, uint16_t *data){
	uint8_t receiveBuffer[3], rd = NAU_OK;
	/*uint8_t _data[3];
	_data[0] = reg & 0x7;
	uint8_t rd = _read_spi_bus(_data);
	data = (_data[0] & 0x07) | ((_data[1] <<7 ) & 0x1ff);*/
	//rd = HAL_I2C_Mem_Read(&hi2c2, NAU_DEV_ID<<1, reg<<1, 1, receiveBuffer, 2, 1000);
	rd = !I2C_Read(NAU_DEV_ID, reg<<1, receiveBuffer, 2, 10);
	*data = (receiveBuffer[0] & 0x01)<<8 | (receiveBuffer[1] & 0xff);
	return rd;
}

⚡ Basic Use Case

c
#include "nau88c22.h"

void codec_init(void)
{
	audio_volume(VOL_HP);
	microfone_interface();
	output_driver();
	output_mixer();

	hpf_filter(&n_ALC);
}

⚙️ Important Functions

c
#include "nau88c22.h"

void codec_init(void)
{
    if(audio_init(&n_ALC)!=AUDIO_OK){//codec init
	  led_on(RED);
	  while(1);
    }
}

🧩 Hardware Connections

NAU88C22	MCU
SDA	I²C SDA
SCL	I²C SCL
BCLK	I2S Bit Clock
LRCK	I2S Word Select
FROM	I2S Data Out
DOUBT	I2S Data In
VDD	3.3V

📌 Compatibility Tested Platforms

STM32F4 Series
STM32H7 Series
RP2040
ESP32-S3
(List may be expanded)

📝 License

This project is released under the MIT License.
You can use it as you wish, modify it, and integrate it into your projects.

🤝 Contribution

Pull requests, improvement suggestions, and bug reports are welcome.