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When using USB-serial-jtag for monitoring idf-monitor will lose connection during deep sleep (because the peripheral powers down) and will need some time to reconnect when we wake-up. In the ULP examples this would result in the chip waking up->printing-> going back to sleep, before idf-monitor is even able to connect, and users would erroneously assume the chip never woke up. Add a 1 sec delay at the start of the examples to improve the user experience when using jtag-serial. |
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| .. | ||
| main | ||
| CMakeLists.txt | ||
| README.md | ||
| sdkconfig.defaults | ||
| Supported Targets | ESP32-S2 | ESP32-S3 |
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ULP-RISC-V ADC Example
This example demonstrates how to use the ULP-RISC-V coprocessor to poll the ADC in deep sleep.
The ULP program periodically measures the input voltage on EXAMPLE_ADC_CHANNEL (by default ADC1 channel 0, GPIO1 on both ESP32-S2 and ESP32-S3). The voltage is compared to an upper threshold. If the voltage is higher than the threshold, the ULP wakes up the system.
By default, the threshold is set to 1.75V, approximately.
In this example, you need to connect a voltage source (e.g. a DC power supply) to the GPIO pin corresponding to the ADC channel specified in ulp/example_config.h (see the macros defined on the top of the header file). Feel free to modify the channel setting.
Hardware Required
- A development board with a SOC which has a RISC-V ULP coprocessor (e.g., ESP32-S2 Saola)
- A USB cable for power supply and programming
Example output
Below is the output from this example.
Not a ULP-RISC-V wakeup (cause = 0), initializing it!
Entering in deep sleep
ULP-RISC-V woke up the main CPU
Threshold: high = 2000
Value = 4095 was above threshold
Entering in deep sleep