kopia lustrzana https://github.com/mikaelnousiainen/RS41ng
Improve README: Add note about BMP280/BME280 differences and fix pinout numbers
Mikael Nousiainen
rodzic
8ec3f8817a
commit
06e85235d9
51
README.md
51
README.md
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@ -58,7 +58,7 @@ The main features the RS41ng firmware are:
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* Support for multiple transmission modes:
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* Standard 1200-baud APRS
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* Option to transmit APRS weather reports using readings from an external BMP280 sensor
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* Option to transmit APRS weather reports using readings from an external BMP280/BME280 sensor
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* [Horus 4FSK v1 and v2 modes](https://github.com/projecthorus/horusdemodlib/wiki) that has improved performance compared to APRS or RTTY
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* There is an option to use continuous transmit mode (for either V1 or V2 mode), which helps with receiver frequency synchronization and improves reception.
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* Morse code (CW)
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@ -66,7 +66,7 @@ The main features the RS41ng firmware are:
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* Support for transmitting multiple modes consecutively with custom, rotating comment messages (see `config.c`)
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* Support for GPS-based scheduling is available for transmission modes that require specific timing for transmissions
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* Support for custom sensors via the external I²C bus
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* 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.
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* GPS NMEA data output via the external serial port pin 3 (see below). This disables use of I²C devices as the serial port pins are shared with the I²C bus pins.
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* This allows using the RS41 sonde GPS data in external tracker hardware, such as Raspberry Pi or other microcontrollers.
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* Enhanced support for the internal Si4032 radio transmitter via PWM-based tone generation (and ultimately DMA-based symbol timing, if possible)
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* Extensibility to allow easy addition of new transmission modes and new sensors
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@ -103,7 +103,8 @@ It is possible to connect external sensors to the I²C bus of the RS41 radiosond
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The following sensors are currently supported:
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* Bosch BMP280 barometric pressure / temperature / humidity sensor
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* Bosch BMP280/BME280 barometric pressure / temperature / humidity sensor
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* Note that only BME280 sensors will report humidity. For BMP280 humidity readings will be zero.
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Sensor driver code contributions are welcome!
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@ -162,43 +163,43 @@ Hardware requirements:
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* These smaller [ST-LINK v2 USB dongles](https://www.adafruit.com/product/2548) also work well.
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* [Partco sells the ST-LINK v2 USB dongles in Finland](https://www.partco.fi/en/measurement/debugging/20140-stlinkv2.html)
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The pinout of the RS41 connector (by DF8OE) is the following:
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The pinout of the RS41 connector (by DF8OE and VK5QI) is the following:
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```
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______________________| |______________________
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| 1 2 3 4 5 |
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| 9 7 5 3 1 |
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| 6 7 8 9 10 |
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| 10 8 6 4 2 |
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|_______________________________________________________|
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(View from the bottom of the sonde, pay attention to the gap in the connector)
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```
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* 1 - SWDIO (PA13)
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* 2 - RST
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* 3 - MCU switched 3.3V out to external device / Vcc (Boost out) 5.0V
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* This pin powers the device via 3.3V voltage from an ST-LINK programmer dongle
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* This pin can be used to supply power to external devices, e.g. Si5351, BMP280 or other sensors
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* 4 - I2C2_SCL (PB10) / UART3 TX
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* This is the external I²C port clock pin for Si5351 and sensors
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* This pin can alternatively be used to output GPS NMEA data to external tracker hardware (e.g. Raspberry Pi or other microcontrollers)
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* 5 - GND
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* 6 - GND
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* 7 - SWCLK (PA14)
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* 8 - +U_Battery / VBAT 3.3V
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* 9 - +VDD_MCU / PB1 * (10k + cap + 10k)
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* 10 - I2C2_SDA (PB11) / UART3 RX
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* This is the external I²C port data pin for Si5351 and sensors
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* 1 - GND
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* 2 - I2C2_SDA (PB11) / UART3 RX
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* This is the external I²C port data pin for Si5351 and sensors
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* 3 - I2C2_SCL (PB10) / UART3 TX
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* This is the external I²C port clock pin for Si5351 and sensors
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* This pin can alternatively be used to output GPS NMEA data to external tracker hardware (e.g. Raspberry Pi or other microcontrollers)
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* 4 - +VDD_MCU / PB1 * (10k + cap + 10k)
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* 5 - MCU switched 3.3V out to external device / Vcc (Boost out) 5.0V
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* This pin powers the device via 3.3V voltage from an ST-LINK programmer dongle
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* This pin can be used to supply power to external devices, e.g. Si5351, BMP280 or other sensors
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* 6 - +U_Battery / VBAT 3.3V
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* 7 - RST
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* 8 - SWCLK (PA14)
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* 9 - SWDIO (PA13)
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* 10 - GND
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### Steps to flash the firmware
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1. Remove batteries from the sonde
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2. Connect an ST-LINK v2 programmer dongle to the sonde via the following pins:
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* SWDIO -> Pin 1
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* SWCLK -> Pin 7
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* GND -> Pin 5
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* 3.3V -> Pin 3
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* SWDIO -> Pin 9 (SWDIO)
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* SWCLK -> Pin 8 (SWCLK)
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* GND -> Pin 1 (GND)
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* 3.3V -> Pin 5 (MCU switch 3.3V)
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3. Unlock the flash protection - needed only before reprogramming the sonde for the first time
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* `openocd -f ./openocd_rs41.cfg -c "init; halt; flash protect 0 0 31 off; exit"`
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* **NOTE:** If the above command fails with an error about erasing sectors, try replacing the number `31` with `63`:
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