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@@ -26,11 +26,13 @@ pip install pysstv
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## Specs to do
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### Get the default shell
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-Should have a Serial interface on GPIO14(UART0_TXD) and GPIO15(UART0_RXD).
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-I'm using a cheat FTDI232, from anywhere.
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+Should have a Serial interface on **GPIO14**(UART0_TXD) and **GPIO15**(UART0_RXD).
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+I'm using a cheap FTDI232, from anywhere.
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### Enable secondary UART port
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+/!\ This step don't works, should not use it ! /!\
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+
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Should add this config parameters to `/boot/config.txt` :
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```
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dtoverlay=disable-bt
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@@ -38,8 +40,19 @@ dtoverlay=uart1,txd1_pin=32,rxd1_pin=33
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force_turbo=1
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enable_uart=1
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```
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+Now we ~~can~~ use **GPIO12** and **GPIO13** for a secondary serial port
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+
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+### Switch the output soundcard to GPIOs
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+
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+We have to play WAV files from the PySSTV converter, and put it directly in the microphone +/- input of the SA828 radio module.
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+
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+By the way, we don't need stereo output, that's why I only made a single RC filter for filtering frequencies over 20Khz.
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-Now we can use GPIO12 and GPIO13 for a secondary serial port
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+The configuration of `/boot/config.txt` will contain this line, then you can connect **GPIO12** and **GPIO13** to a stereo jack.
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+
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+```
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+dtoverlay=audremap,pins_12_13 # for pins 12 and 13
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+```
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## Usages
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