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eleccoder 2021-08-31 12:49:59 +02:00
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@ -24,6 +24,12 @@ Your host platform for cross-compilation is assumed to be LINUX.
1. Install the Pico-SDK following the instructions given in the [Raspberry Pi 'Getting Started' Guide](https://datasheets.raspberrypi.org/pico/getting-started-with-pico.pdf) (pdf) 1. Install the Pico-SDK following the instructions given in the [Raspberry Pi 'Getting Started' Guide](https://datasheets.raspberrypi.org/pico/getting-started-with-pico.pdf) (pdf)
1. Set the `PICO_SDK_PATH` environment variable to point to your Pico-SDK installation directory 1. Set the `PICO_SDK_PATH` environment variable to point to your Pico-SDK installation directory
1. Install the [pico-extras](https://github.com/raspberrypi/pico-extras) libraries:
```
cd $PICO_SDK_PATH/..
git clone -b master https://github.com/raspberrypi/pico-extras.git
```
## Hardware ## Hardware
@ -53,7 +59,7 @@ cd build
The analog AFSK audio signal will be available at the filter's line-out. You can probe it by a scope, listen to it by using an audio amp, or connect it to any RF transceiver to send it on the air (ham radio license required). The analog AFSK audio signal will be available at the filter's line-out. You can probe it by a scope, listen to it by using an audio amp, or connect it to any RF transceiver to send it on the air (ham radio license required).
## TODO (Aug 2021) ## TODO (Sept. 2021)
- [x] Thorough evaluation, in general - [x] Thorough evaluation, in general
- [x] Send the APRS message on the console (USB or UART) rather than hard-coding - [x] Send the APRS message on the console (USB or UART) rather than hard-coding
@ -63,4 +69,4 @@ The analog AFSK audio signal will be available at the filter's line-out. You can
## Ingredients / Acknowledgements ## Ingredients / Acknowledgements
- For APRS => AX.25 => PCM conversion I'm using [my modified version](https://github.com/eleccoder/ax25-aprs-lib) of [fsphil's ax25beacon](https://github.com/fsphil/ax25beacon) - For APRS => AX.25 => PCM conversion I'm using [my modified version](https://github.com/eleccoder/ax25-aprs-lib) of [fsphil's ax25beacon](https://github.com/fsphil/ax25beacon)
- For PCM => PWM conversion I'm using the audio lib from [pico-extras](https://github.com/raspberrypi/pico-extras) (WARNING: maturity seems to be alpha/beta) - For PCM => PWM conversion I'm using the `pico_audio_pwm` library from [pico-extras](https://github.com/raspberrypi/pico-extras) (NOTE: ATTOW, maturity seems to be rather alpha/beta)