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64 lines
2.0 KiB
Markdown
64 lines
2.0 KiB
Markdown
| Supported Targets | ESP32-C3 |
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# ADC DMA Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example shows how to use DMA-Read-APIs and Single-Read-APIs to read voltage from GPIO pins via ADC controller.
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## How to use example
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### Hardware Required
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* A development board with ESP32C3 SoC
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* A USB cable for power supply and programming
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For `single_read` (Single-Read-APIs example), we use `ADC1_CHANNEL_2`, `ADC1_CHANNEL_3`, `ADC1_CHANNEL_4`, `ADC2_CHANNEL_0`. Hence we need to connect voltage sources (0 ~ 3.3V) to GPIO2, GPIO3, GPIO4, GPIO5 respectively.
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For `continuous_read` (DMA-Read-APIs example), we use `ADC1_CHANNEL_0`, `ADC1_CHANNEL_1` and `ADC2_CHANNEL_0`. Therefore, GPIO0, GPIO1 and GPIO5 should be connected to voltage sources (0 ~ 3.3V).
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If other ADC units/channels are selected in your application, you need to change the GPIO pin (please refer to the `ESP32C3 Technical Reference Manual`).
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### Configure the project
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```
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idf.py menuconfig
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```
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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Running this example, you will see the following log output on the serial monitor:
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```
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I (322) ADC1_CH2: 7c8
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I (322) ADC1_CH3: 278
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I (322) ADC1_CH4: d4b
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I (322) ADC2_CH0: 48
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```
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```
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ADC1_CH0: 61b
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ADC1_CH1: 39b
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ADC2_CH0: 4b
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```
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## Troubleshooting
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* program upload failure
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* Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
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* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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