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Update README for GPS NMEA output and improve RS41 connector pinout description

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Mikael Nousiainen 2021-11-11 18:39:31 +02:00
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README.md
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@ -65,6 +65,8 @@ The main features the RS41ng firmware are:
* Support for transmitting multiple modes consecutively with custom, rotating comment messages (see `config.c`)
* Support for GPS-based scheduling is available for transmission modes that require specific timing for transmissions
* Support for custom sensors via the external I²C bus
* GPS NMEA data output via the external serial port pin 4 (see below). This disables use of I²C devices as the serial port pins are shared with the I²C bus pins.
* This allows using the RS41 sonde GPS data in external tracker hardware, such as Raspberry Pi or other microcontrollers.
* Enhanced support for the internal Si4032 radio transmitter via PWM-based tone generation (and ultimately DMA-based symbol timing, if possible)
* Extensibility to allow easy addition of new transmission modes and new sensors
@ -172,14 +174,18 @@ ______________________| |______________________
* 1 - SWDIO (PA13)
* 2 - RST
* 3 - MCU switched 3.3V out to external device / Vcc (Boost out) 5.0V
-- This pin powers the device via 3.3V from an ST-LINK programmer dongle
* 4 - I2C2_SCL (PB10) / UART3 TX -- This is the external I²C port clock pin for Si5351 and sensors
* This pin powers the device via 3.3V voltage from an ST-LINK programmer dongle
* This pin can be used to supply power to external devices, e.g. Si5351, BMP280 or other sensors
* 4 - I2C2_SCL (PB10) / UART3 TX
* This is the external I²C port clock pin for Si5351 and sensors
* This pin can alternatively be used to output GPS NMEA data to external tracker hardware (e.g. Raspberry Pi or other microcontrollers)
* 5 - GND
* 6 - GND
* 7 - SWCLK (PA14)
* 8 - +U_Battery / VBAT 3.3V
* 9 - +VDD_MCU / PB1 * (10k + cap + 10k)
* 10 - I2C2_SDA (PB11) / UART3 RX -- This is the external I²C port data pin for Si5351 and sensors
* 10 - I2C2_SDA (PB11) / UART3 RX
* This is the external I²C port data pin for Si5351 and sensors
### Steps to flash the firmware