gronod/squeezelite-esp32
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gronod
2026-03-13 17:03:22 +00:00
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lib/squeezelite/wm8978/wm8978.c Normal file
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/*
* Squeezelite for esp32
*
* (c) Wizmo 2021
* Sebastien 2019
* Philippe G. 2019, philippe_44@outlook.com
*
* This software is released under the MIT License.
* https://opensource.org/licenses/MIT
*
*/
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <driver/i2s.h>
#include "driver/i2c.h"
#include "esp_log.h"
#include "adac.h"
static const char TAG[] = "WM8978";
static void speaker(bool active) { }
static void headset(bool active) { }
static bool volume(unsigned left, unsigned right) { return false; }
static void power(adac_power_e mode);
static bool init(char *config, int i2c_port_num, i2s_config_t *i2s_config, bool *mck);
static esp_err_t i2c_write_shadow(uint8_t reg, uint16_t val);
static uint16_t i2c_read_shadow(uint8_t reg);
static int WM8978;
const struct adac_s dac_wm8978 = { "WM8978", init, adac_deinit, power, speaker, headset, volume };
// initiation table for non-readbale 9-bit i2c registers
static uint16_t WM8978_REGVAL_TBL[58] = {
0X0000, 0X0000, 0X0000, 0X0000, 0X0050, 0X0000, 0X0140, 0X0000,
0X0000, 0X0000, 0X0000, 0X00FF, 0X00FF, 0X0000, 0X0100, 0X00FF,
0X00FF, 0X0000, 0X012C, 0X002C, 0X002C, 0X002C, 0X002C, 0X0000,
0X0032, 0X0000, 0X0000, 0X0000, 0X0000, 0X0000, 0X0000, 0X0000,
0X0038, 0X000B, 0X0032, 0X0000, 0X0008, 0X000C, 0X0093, 0X00E9,
0X0000, 0X0000, 0X0000, 0X0000, 0X0003, 0X0010, 0X0010, 0X0100,
0X0100, 0X0002, 0X0001, 0X0001, 0X0039, 0X0039, 0X0039, 0X0039,
0X0001, 0X0001
};
/****************************************************************************************
* init
*/
static bool init(char *config, int i2c_port, i2s_config_t *i2s_config, bool *mck) {
WM8978 = adac_init(config, i2c_port);
if (!WM8978) WM8978 = 0x1a;
ESP_LOGI(TAG, "WM8978 detected @%d", WM8978);
*mck = true;
// init sequence
i2c_write_shadow(0, 0);
i2c_write_shadow(4, 16);
i2c_write_shadow(6, 0);
i2c_write_shadow(10, 8);
i2c_write_shadow(43, 16);
i2c_write_shadow(49, 102);
return true;
}
/****************************************************************************************
* power
*/
static void power(adac_power_e mode) {
uint16_t *data, off[] = {0, 0, 0}, on[] = {11, 384, 111};
data = (mode == ADAC_STANDBY || mode == ADAC_OFF) ? off : on;
i2c_write_shadow(1, data[0]);
i2c_write_shadow(2, data[1]);
i2c_write_shadow(3, data[2]);
}
/****************************************************************************************
* Write with custom reg/value structure
*/
static esp_err_t i2c_write_shadow(uint8_t reg, uint16_t val) {
WM8978_REGVAL_TBL[reg] = val;
reg = (reg << 1) | ((val >> 8) & 0x01);
val &= 0xff;
return adac_write_byte(WM8978, reg, val);
}
/****************************************************************************************
* Return local register value
*/
static uint16_t i2c_read_shadow(uint8_t reg) {
return WM8978_REGVAL_TBL[reg];
}