https://github.com/elehobica/pico_level_meter
Audio Level Meter for rp2040
https://github.com/elehobica/pico_level_meter
level-meter raspberry-pi-pico rp2040
Last synced: about 1 year ago
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Audio Level Meter for rp2040
- Host: GitHub
- URL: https://github.com/elehobica/pico_level_meter
- Owner: elehobica
- License: bsd-2-clause
- Created: 2023-10-29T02:50:43.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2025-02-24T13:10:15.000Z (over 1 year ago)
- Last Synced: 2025-02-24T14:25:38.069Z (over 1 year ago)
- Topics: level-meter, raspberry-pi-pico, rp2040
- Language: C++
- Homepage:
- Size: 387 KB
- Stars: 5
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE.txt
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README
# Audio Level Meter for rp2350
## Overview
This is Audio Level Meter library for rp2350
This project feattures:
* Analog signal inputs for 2 channels
* Configurable dB scale steps and levels
* Preserved input attenuator values
## Supported Board and Peripheral Devices
* Raspberry Pi Pico 2
* M62429 / FM62429 Electric Volume
* ST7735S 80x160 LCD
## Pin Assignment
### Audio Input
| Pin # | Pin Name | Function | Signal Name |
----|----|----|----
|31 | GP26 | ADC0 | L_IN |
|32 | GP27 | ADC1 | R_IN |
### M62429 / FM62429 Electric Volume
| Pin # | Pin Name | Function | Signal Name |
----|----|----|----
|19 | GP14 | GPIO | PIN_FM62429_DATA |
|20 | GP15 | GPIO | PIN_FM62429_CLOCK |
## Schematic
The frontend analog circuit should be needed.
[pico_level_meter.pdf](doc/pico_level_meter.pdf)
## How to build
* See ["Getting started with Raspberry Pi Pico"](https://datasheets.raspberrypi.org/pico/getting-started-with-pico.pdf)
* Put "pico-sdk", "pico-examples" and "pico-extras" on the same level with this project folder.
* Set environmental variables for PICO_SDK_PATH, PICO_EXTRAS_PATH and PICO_EXAMPLES_PATH
* Confirmed with Pico SDK 2.1.1
```
> git clone -b 2.1.1 https://github.com/raspberrypi/pico-sdk.git
> cd pico-sdk
> git submodule update -i
> cd ..
> git clone -b sdk-2.1.1 https://github.com/raspberrypi/pico-examples.git
>
> git clone -b sdk-2.1.1 https://github.com/raspberrypi/pico-extras.git
>
> git clone -b main https://github.com/elehobica/pico_level_meter.git
> cd pico_level_meter
> git submodule update -i
> cd ..
```
### Windows
* Build is confirmed with Developer Command Prompt for VS 2022 and Visual Studio Code on Windows environment
* Confirmed with cmake-3.27.2-windows-x86_64 and gcc-arm-none-eabi-10.3-2021.10-win32
* Lanuch "Developer Command Prompt for VS 2022"
```
> cd pico_level_meter
> mkdir build && cd build
> cmake -G "NMake Makefiles" ..
> nmake
```
* Put "pico_level_meter.uf2" on RPI-RP2 drive
### Linux
* Build is confirmed with [pico-sdk-dev-docker:sdk-2.1.1-1.0.0]( https://hub.docker.com/r/elehobica/pico-sdk-dev-docker)
* Confirmed with cmake-3.22.1 and arm-none-eabi-gcc (15:10.3-2021.07-4) 10.3.1
```
$ cd pico_level_meter
$ mkdir build && cd build
$ cmake ..
$ make -j4
```
* Download "pico_level_meter.uf2" on RPI-RP2 drive
* See ["Getting started with Raspberry Pi Pico"](https://datasheets.raspberrypi.org/pico/getting-started-with-pico.pdf)
* Put "pico-sdk", "pico-examples" and "pico-extras" on the same level with this project folder.
* Set environmental variables for PICO_SDK_PATH, PICO_EXTRAS_PATH and PICO_EXAMPLES_PATH
* Build is confirmed in Developer Command Prompt for VS 2022 and Visual Studio Code on Windows enviroment
* Confirmed with Pico SDK 1.5.1, cmake-3.27.2-windows-x86_64 and gcc-arm-none-eabi-10.3-2021.10-win32
```
> git clone -b master https://github.com/raspberrypi/pico-sdk.git
> cd pico-sdk
> git submodule update -i
> cd ..
> git clone -b master https://github.com/raspberrypi/pico-examples.git
>
> git clone -b main https://github.com/elehobica/pico_level_meter.git
> cd pico_level_meter
> git submodule update -i
> cd ..
```
* Lanuch "Developer Command Prompt for VS 2022"
```
> cd pico_level_meter
> mkdir build
> cd build
> cmake -G "NMake Makefiles" ..
> nmake
```
* Put "pico_level_meter.uf2" on RPI-RP2 drive
### Serial interface usage
* type ' ' to display current settings
* type 's' to store current settings to Flash
* type '+' or '=' to decrease attenuation (level up)
* type '-' to increase attenuation (level down)
* type 'b' to adjust attenuation for both channels
* type 'l' to adjust attenuation for left channel
* type 'r' to adjust attenuation for right channel
* type 'p' to toggle peak hold mode