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fix(plip): ES8388 ADC unmute (ADCCONTROL6=0x00) + full ADC power-up (ADCPOWER=0x00)

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ADCCONTROL6 (reg 0x0E) reset default = 0x30 which has ADCSMUTE=1 (bit5) — ADC output
muted by default. Writing 0x00 unmutes. Without this, ADCINSEL=0x50 (LIN2) is selected
but the signal is suppressed at the ADC output stage → peak=0.

ADCPOWER (reg 0x03) changed from 0x09 (intermediate Espressif open state) to 0x00 (full
power-up: all power-down bits cleared). Value 0x09 = bits 0+3 set (ADCPD_L + MICBIAS_PD)
— MICBIAS_PD in particular means the internal microphone bias is powered off, which can
starve the SLIC line-in path. 0x00 is the correct end state for recording mode per
Espressif esp8388_start(ES_MODULE_ADC) reference.

sdkconfig.defaults: add CONFIG_PLIP_HOOK_GPIO=23 / CONFIG_PLIP_HOOK_ACTIVE_HIGH=y
as explicit defaults so clean builds use the SLIC SHK pin without menuconfig.
This commit is contained in:
electron-rare
2026-06-15 00:36:43 +02:00
parent 0f7047215b
commit 47fbc09fea
2 changed files with 11 additions and 3 deletions
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plip_voice/main/es8388.c
+7 -3
View File
@@ -160,6 +160,7 @@ esp_err_t es8388_init(void)
if (i2c_write_reg(ES8388_ADC_CTL3, 0x02) != ESP_OK) return ESP_FAIL; /* DS filter sel */
if (i2c_write_reg(ES8388_ADC_CTL4, 0x0C) != ESP_OK) return ESP_FAIL; /* I2S 16-bit */
if (i2c_write_reg(ES8388_ADC_CTL5, 0x02) != ESP_OK) return ESP_FAIL; /* RATIO=256 */
if (i2c_write_reg(0x0E, 0x00) != ESP_OK) return ESP_FAIL; /* ADCCONTROL6: clear ADCSMUTE bit5 (reset default 0x30 = ADC output muted) */
if (i2c_write_reg(ES8388_ADC_CTL8, 0x00) != ESP_OK) return ESP_FAIL; /* ADC vol L 0dB */
if (i2c_write_reg(ES8388_ADC_CTL9, 0x00) != ESP_OK) return ESP_FAIL; /* ADC vol R 0dB */
@@ -202,9 +203,12 @@ esp_err_t es8388_init(void)
/* 13. DAC power: power up DAC L+R. */
if (i2c_write_reg(ES8388_DAC_POWER, 0x3C) != ESP_OK) return ESP_FAIL;
/* 14. ADC power: power up ADC (0x09 per Espressif reference).
* Must come AFTER DACCONTROL21 state machine restart and all ADC register writes. */
if (i2c_write_reg(ES8388_ADC_POWER, 0x09) != ESP_OK) return ESP_FAIL;
/* 14. ADC power: full power-up (all Pdn bits cleared = 0x00).
* 0x09 is the intermediate state (Espressif es8388_open end-state), but
* the full ADC + analog input power-up requires 0x00 (Espressif es8388_start(ADC)).
* Must come AFTER DACCONTROL21 state machine restart and ADCCONTROL6 unmute. */
if (i2c_write_reg(ES8388_ADC_POWER, 0x00) != ESP_OK) return ESP_FAIL;
vTaskDelay(pdMS_TO_TICKS(10)); /* let ADC analog settle after full power-up */
/* 15. Enable PA (power amplifier for speaker). */
gpio_set_direction(PLIP_PA_ENABLE, GPIO_MODE_OUTPUT);
plip_voice/sdkconfig.defaults
+4
View File
@@ -35,6 +35,10 @@ CONFIG_ESP_TASK_WDT_TIMEOUT_S=15
# when I2S/WiFi interrupts spill into idle stack on original ESP32.
CONFIG_FREERTOS_IDLE_TASK_STACKSIZE=2048
# SLIC hook GPIO — SHK on GPIO23 (A1S KEY4, active-HIGH: HIGH = off-hook)
CONFIG_PLIP_HOOK_GPIO=23
CONFIG_PLIP_HOOK_ACTIVE_HIGH=y
# WiFi credentials — set via `idf.py menuconfig` (PLIP Voice Configuration)
# or override locally in sdkconfig (NOT committed).
# CONFIG_PLIP_WIFI_SSID="..."