use DAC play audio not work (IDFGH-5999)

[xiaowei809362674]

Environment

• Development Kit: ESP32_DevKitc
• Kit version v4
• Module or chip used: ESP32-WROOM-32D
• IDF version (run git describe --tags to find it):
  v4.4-dev-3235-g3e370c4296
• Build System: idf.py
• Compiler version (run xtensa-esp32-elf-gcc --version to find it):
  xtensa-esp32-elf-gcc (crosstool-NG esp-2021r1) 8.4.0
  Copyright (C) 2018 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions. There is NO
  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
• Operating System: [Linux]
• Using an IDE?: [No]
• Power Supply: [USB]

Problem Description

//Detailed problem description goes here.

build and flash example : esp-idf/examples/peripherals/i2s/i2s_adc_dac, and use a speaker connect GPIO25/GPIO26 and GND,

change code
#define RECORD_IN_FLASH_EN (0)
#define REPLAY_FROM_FLASH_EN (0)

Actual Behavior

speaker no voice out

Steps to reproduce

1. connect speaker to GPIO25/GPIO26 and GND
2. build and flash

Debug Logs

I (29) boot: ESP-IDF v4.4-dev-3235-g3e370c4296-dirty 2nd stage bootloader
I (29) boot: compile time 19:00:02
I (30) boot: chip revision: 1
I (34) boot_comm: chip revision: 1, min. bootloader chip revision: 0
I (41) boot.esp32: SPI Speed : 40MHz
I (45) boot.esp32: SPI Mode : DIO
I (50) boot.esp32: SPI Flash Size : 4MB
I (54) boot: Enabling RNG early entropy source...
I (60) boot: Partition Table:
I (63) boot: ## Label Usage Type ST Offset Length
I (71) boot: 0 nvs WiFi data 01 02 00009000 00006000
I (78) boot: 1 phy_init RF data 01 01 0000f000 00001000
I (86) boot: 2 factory factory app 00 00 00010000 00100000
I (93) boot: 3 storage Unknown data 01 81 00110000 00200000
I (101) boot: End of partition table
I (105) boot_comm: chip revision: 1, min. application chip revision: 0
I (112) esp_image: segment 0: paddr=00010020 vaddr=3f400020 size=1c67ch (116348) map
I (163) esp_image: segment 1: paddr=0002c6a4 vaddr=3ffb0000 size=02374h ( 9076) load
I (167) esp_image: segment 2: paddr=0002ea20 vaddr=40080000 size=015f8h ( 5624) load
I (171) esp_image: segment 3: paddr=00030020 vaddr=400d0020 size=18700h (100096) map
I (213) esp_image: segment 4: paddr=00048728 vaddr=400815f8 size=09fd4h ( 40916) load
I (230) esp_image: segment 5: paddr=00052704 vaddr=50000000 size=00010h ( 16) load
I (236) boot: Loaded app from partition at offset 0x10000
I (236) boot: Disabling RNG early entropy source...
I (250) cpu_start: Pro cpu up.
I (251) cpu_start: Starting app cpu, entry point is 0x40081008
0x40081008: call_start_cpu1 at /home/xw/esp/esp-idf/components/esp_system/port/cpu_start.c:155

I (0) cpu_start: App cpu up.
I (265) cpu_start: Pro cpu start user code
I (265) cpu_start: cpu freq: 160000000
I (265) cpu_start: Application information:
I (269) cpu_start: Project name: i2s-adc-dac
I (275) cpu_start: App version: v4.4-dev-3235-g3e370c4296-dirty
I (282) cpu_start: Compile time: Oct 4 2021 18:59:52
I (288) cpu_start: ELF file SHA256: 5a160f3f46c28ca1...
I (294) cpu_start: ESP-IDF: v4.4-dev-3235-g3e370c4296-dirty
I (301) heap_init: Initializing. RAM available for dynamic allocation:
I (308) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (314) heap_init: At 3FFB2C60 len 0002D3A0 (180 KiB): DRAM
I (320) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (327) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (333) heap_init: At 4008B5CC len 00014A34 (82 KiB): IRAM
I (340) spi_flash: detected chip: generic
I (344) spi_flash: flash io: dio
I (349) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
E (364) I2S: mclk is too small
I (368) I2S: DMA Malloc info, datalen=blocksize=4092, dma_buf_count=2
I (375) I2S: DMA Malloc info, datalen=blocksize=4092, dma_buf_count=2
partiton addr: 0x00110000; size: 2097152; label: storage
Skip flash erasing...
Playing file example:
E (391) I2S: mclk is too small
E (519) I2S: mclk is too small
Playing file example:
E (520) I2S: mclk is too small
E (644) I2S: mclk is too small
Playing file example:
E (645) I2S: mclk is too small
E (769) I2S: mclk is too small
Playing file example:
E (770) I2S: mclk is too small
E (894) I2S: mclk is too small
Playing file example:
E (895) I2S: mclk is too small
E (1019) I2S: mclk is too small
Playing file example:
E (1020) I2S: mclk is too small
E (1144) I2S: mclk is too small
Playing file example:
E (1145) I2S: mclk is too small
E (1269) I2S: mclk is too small
Playing file example:
E (1270) I2S: mclk is too small
E (1394) I2S: mclk is too small
Playing file example:
E (1395) I2S: mclk is too small
E (1519) I2S: mclk is too small
done

[xiaowei809362674]

just branch master have this problem

[cicciocb]

This issue is still present in the build that is included in the latest arduino-esp32 sdk 2.0.1 so it should be reopen

[PilnyTomas]

I just tested it and it seems to be working:
ESP32-WROOM-32D; tested on IDF release/v4.4 and master and both produce the pre-recorded audio file. I can hear it from speakers and see it on an oscilloscope.
Can you guys provide more info to reproduce your issue? What amplifier and what speakers are you using? Do you have an oscilloscope to check the signals?
@cicciocb, @xiaowei809362674

[PilnyTomas]

@realfast digitalWrite does not use DAC. To test the I2S module in DAC mode use

I2S.begin(ADC_DAC_MODE,  sampleRate, bitsPerSample);
I2S.write(sample);

EDIT: the previous comment was deleted by the author.

[MartinNohr]

I cannot get the DAC to work on TTGO T-Display ESP32. Could it be related to this issue?
I'm using the i2s driver. It does work in PDM, it is just the DAC mode that doesn't work.
I can supply more information, I don't know what might be needed. Here is the driver values.
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN), // Only TX
.sample_rate = (uint32_t)SAMPLE_RATE,
.bits_per_sample = (i2s_bits_per_sample_t)16,
.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,
.communication_format = (i2s_comm_format_t)(/I2S_COMM_FORMAT_I2S |/ I2S_COMM_FORMAT_I2S_MSB),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, //Interrupt level 1
.dma_buf_count = 6,
.dma_buf_len = 60,
.use_apll = false,
};
i2s_pin_config_t pin_config = {
.mck_io_num = I2S_MCK_IO,
.bck_io_num = I2S_BCK_IO,
.ws_io_num = I2S_WS_IO,
.data_out_num = I2S_DO_IO,
.data_in_num = I2S_DI_IO //Not used
};
i2s_driver_install((i2s_port_t)I2S_NUM, &i2s_config, 0, NULL);
i2s_set_pin((i2s_port_t)I2S_NUM, &pin_config);
i2s_set_dac_mode(I2S_DAC_CHANNEL_RIGHT_EN);

i2s_write((i2s_port_t)I2S_NUM, samples_data, ((bits + 8) / 16) * SAMPLE_PER_CYCLE * 4, &i2s_bytes_write, 100);

I connected an oscilloscope the GPIO25, there is no signal.
Turning off the DAC mode results in proper PDM output on pin 25.

[FedericoBusero]

In which Arduino ESP32 core / IDF version are you working? Are you working in Arduino IDE or PlatformIO?

[MartinNohr]

I'm using Microsoft Visual Studio with the Arduino Visual Micro extension. I am not sure how to check which IDF version I'm using.
I've actually given up on using it and am adding a sound chip to my PCB board. I'm also starting to use the ESP32-S3 which doesn't support the DAC output.