Supported Targets	ESP32-S3	ESP32-C3

TDM Example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

In this example, we generate a 100Hz triangle and sine wave and send it to 8 channels at a sample rate of 44.1kHz through the I2S bus in TDM mode.

How to Use Example

Hardware Required

• A development board with ESP32-S3 or ESP32-C3 SoC (e.g., ESP32-S3-DevKitC, ESP32-C3-DevKitM, etc.)
• A USB cable for power supply and programming

Configure the Project

idf.py set-target esp32s3
idf.py menuconfig

or

idf.py set-target esp32c3
idf.py menuconfig

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

idf.py -p PORT flash monitor

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

Test bits=24 free mem=361704, written data=14112
I (128) tdm_example: set clock
I (128) tdm_example: write data

Test bits=24 free mem=362816, written data=14112
I (5178) tdm_example: set clock
I (5178) tdm_example: write data

Test bits=24 free mem=362816, written data=14112
I (10228) tdm_example: set clock
I (10228) tdm_example: write data

If you have a logic analyzer, you can use a logic analyzer to grab online data. The following table describes the pins we use by default (Note that you can also use other pins for the same purpose).

pin name	function	gpio_num
WS	word select	GPIO_NUM_4
MCK	main system clock	GPIO_NUM_5
SCK/BCK	shift/"bit" clock	GPIO_NUM_6
SD	serial data	GPIO_NUM_7

Troubleshooting

• Program upload failure

  • Hardware connection is not correct: run idf.py -p PORT monitor, and reboot your board to see if there are any output logs.
  • The baud rate for downloading is too high: lower your baud rate in the menuconfig menu, and try again.

For any technical queries, please open an issue on GitHub. We will get back to you soon.