tmedicci opened a new pull request, #17137:
URL: https://github.com/apache/nuttx/pull/17137
## Summary
* risc-v/espressif/pcnt: Update common source code functions
- Updates the common source code for the PCNT peripheral used by
Espressif's RISC-Vs SoCs. This enables newer SoCs to be supported in the future
while maintaining backwards compatibility.
## Impact
Impact on user: No.
Impact on build: No.
Impact on hardware: Not yet: newer Espressif SoCs can be supported on NuttX
following this change.
Impact on documentation: No.
Impact on security: No.
Impact on compatibility: No. It's totally backwards compatible.
## Testing
Testing can be performed using any of the `qencoder` defconfigs available
for any of Espressif's RISC-V-based devices (ESP32-C6, or ESP32-H2). The
behavior of the PCNT peripheral didn't change, and this PR's results are the
same of the results before it. This can be verified:
### Building
#### ESP32-C6
```
make -j distclean && ./tools/configure.sh esp32c6-devkitc:qencoder && make
flash ESPTOOL_PORT=/dev/ttyUSB0 && picocom -b 115200 /dev/ttyUSB0
```
#### ESP32-H2
```
make -j distclean && ./tools/configure.sh esp32h2-devkit:qencoder && make
flash ESPTOOL_PORT=/dev/ttyUSB0 && picocom -b 115200 /dev/ttyUSB0
```
### Running
This can be tested by the `qe` application (please note that this
application would only show any non-zero result if an external quadrature
encoder is attached). Type `qe` on NSH.
### Results
Using the `qe` application, it can be verified that no pulses are being
counted (no external device):
```
nsh> ls /dev/
/dev:
console
null
pcnt0
qe0
random
ttyS0
zero
nsh> qe
qe_main: Hardware initialized. Opening the encoder device: /dev/qe0
qe_main: Number of samples: 20
qe_main: 1. 0
qe_main: 2. 0
```
Espressif's internal CI provides an application that tests internally
generates a signal similar to a quadrature encoder and, then, attaches it to
the respective pings of the peripheral. All tests passed successfully. An
example of such testing:
```
nsh> qe_test -f 100
Pulse Counter Test
PWM Out 0 GPIO: 2
PWM Out 1 GPIO: 3
PCNT CH0 Pulse GPIO: 10
PCNT CH1 Ctrl GPIO: 11
PWM Duty: 32767
qe_open: crefs: 0
qe_open: calling setup
qe_ioctl: cmd: 3842 arg: 0
esp_reset: Resetting position to zero
PWM Freq: 100 Hz
Direction: 1
PWM Offset (CW): 2500 us
pcnt: config GPIO matrix
pcnt: setup PWM
pcnt: setup QE
qe_ioctl: cmd: 3841 arg: 1082175964
qe_close: crefs: 1
qe_close: calling shutdown
Result:
pcnt: 401
```
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