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@@ -0,0 +1,98 @@
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+/*
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+ * Squeezelite for esp32
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+ *
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+ * (c) Wizmo 2021
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+ * Sebastien 2019
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+ * Philippe G. 2019, philippe_44@outlook.com
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+ *
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+ * This software is released under the MIT License.
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+ * https://opensource.org/licenses/MIT
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+ *
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+ */
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+
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+#include <freertos/FreeRTOS.h>
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+#include <freertos/task.h>
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+#include <driver/i2s.h>
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+#include "driver/i2c.h"
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+#include "esp_log.h"
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+#include "adac.h"
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+
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+static const char TAG[] = "WM8978";
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+
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+static void speaker(bool active) { }
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+static void headset(bool active) { }
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+static bool volume(unsigned left, unsigned right) { return false; }
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+static void power(adac_power_e mode);
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+static bool init(char *config, int i2c_port_num, i2s_config_t *i2s_config);
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+
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+static esp_err_t i2c_write_shadow(uint8_t reg, uint16_t val);
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+static uint16_t i2c_read_shadow(uint8_t reg);
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+
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+static int WM8978;
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+
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+const struct adac_s dac_wm8978 = { "WM8978", init, adac_deinit, power, speaker, headset, volume };
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+
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+// initiation table for non-readbale 9-bit i2c registers
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+static uint16_t WM8978_REGVAL_TBL[58] = {
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+ 0X0000, 0X0000, 0X0000, 0X0000, 0X0050, 0X0000, 0X0140, 0X0000,
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+ 0X0000, 0X0000, 0X0000, 0X00FF, 0X00FF, 0X0000, 0X0100, 0X00FF,
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+ 0X00FF, 0X0000, 0X012C, 0X002C, 0X002C, 0X002C, 0X002C, 0X0000,
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+ 0X0032, 0X0000, 0X0000, 0X0000, 0X0000, 0X0000, 0X0000, 0X0000,
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+ 0X0038, 0X000B, 0X0032, 0X0000, 0X0008, 0X000C, 0X0093, 0X00E9,
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+ 0X0000, 0X0000, 0X0000, 0X0000, 0X0003, 0X0010, 0X0010, 0X0100,
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+ 0X0100, 0X0002, 0X0001, 0X0001, 0X0039, 0X0039, 0X0039, 0X0039,
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+ 0X0001, 0X0001
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+};
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+
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+/****************************************************************************************
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+ * init
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+ */
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+static bool init(char *config, int i2c_port, i2s_config_t *i2s_config) {
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+ WM8978 = adac_init(config, i2c_port);
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+
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+ if (!WM8978) WM8978 = 0x1a;
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+ ESP_LOGI(TAG, "WM8978 detected @%d", WM8978);
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+
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+ // init sequence
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+ i2c_write_shadow(0, 0);
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+ i2c_write_shadow(4, 16);
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+ i2c_write_shadow(6, 0);
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+ i2c_write_shadow(10, 8);
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+ i2c_write_shadow(43, 16);
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+ i2c_write_shadow(49, 102);
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+
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+ // Configure system clk to GPIO0 for DAC MCLK input
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+ ESP_LOGI(TAG, "Configuring MCLK on pin:%d", 0);
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+ PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0_CLK_OUT1);
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+ REG_WRITE(PIN_CTRL, 0xFFFFFFF0);
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+
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+ return true;
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+}
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+
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+/****************************************************************************************
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+ * power
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+ */
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+static void power(adac_power_e mode) {
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+ uint16_t *data, off[] = {0, 0, 0}, on[] = {11, 384, 111};
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+ data = (mode == ADAC_STANDBY || mode == ADAC_OFF) ? off : on;
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+ i2c_write_shadow(1, data[0]);
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+ i2c_write_shadow(2, data[1]);
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+ i2c_write_shadow(3, data[2]);
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+}
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+
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+/****************************************************************************************
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+ * Write with custom reg/value structure
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+ */
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+ static esp_err_t i2c_write_shadow(uint8_t reg, uint16_t val) {
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+ WM8978_REGVAL_TBL[reg] = val;
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+ reg = (reg << 1) | ((val >> 8) & 0x01);
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+ val &= 0xff;
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+ return adac_write_byte(WM8978, reg, val);
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+}
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+
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+/****************************************************************************************
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+ * Return local register value
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+ */
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+static uint16_t i2c_read_shadow(uint8_t reg) {
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+ return WM8978_REGVAL_TBL[reg];
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+}
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Sebastien