Add support for RAK811 board

[Ebiroll]

Please add something like this, rak811.json STM32L161 mcu. https://www.aliexpress.com/store/product/RAK811-LoRa-Tracker-Board-MAX-7Q-GPS-Module-and-MEMS-Sensor-Wireless-Remote-Positioning-Solution-LoRaWAN/2805180_32844470946.html?spm=2114.12010608.0.0.219c103eDASa9w

I think earlier versions of the board only had 16K ram so stm32l15xx6.ld is maybe better as ldscript. { "build": { "core": "stm32", "cpu": "cortex-m3", "extra_flags": "-DSTM32L151xB -DSTM32L151CBU6", "hwids": [ [ "0x0429", "0x0003" ], [ "0x0429", "0x0004" ] ], "f_cpu": "32768000L", "mcu": "stm32l151cbu6", "variant": "stm32l151xba", "ldscript": "/home/olof/rak/STM32L151XBA_FLASH.ld" }, "frameworks": [ "mbed", "cmsis" ], "name": "Rak811", "upload": { "maximum_ram_size": 32768, "maximum_size": 128000 }, "url": "http://www.rakwireless.com/en/download/RAK811/Hardware%20Design", "vendor": "RAK" }

Linker script, https://github.com/RAKWireless/RAK811_BreakBoard/blob/master/src/boards/RAK811BreakBoard/cmsis/arm-gcc/STM32L151XBA_FLASH.ld

stm32flash /dev/ttyUSB0 stm32flash 0.5 http://stm32flash.sourceforge.net/

Interface serial_posix: 57600 8E1 Version : 0x31 Option 1 : 0x00 Option 2 : 0x00 Device ID : 0x0429 (STM32L1xxx6(8/B)A)

• RAM : 32KiB (4096b reserved by bootloader)
• Flash : 128KiB (size first sector: 16x256)
• Option RAM : 32b
• System RAM : 4KiB

Here is source, https://github.com/RAKWireless/RAK811_BreakBoard

[sabas1080]

I am trying to port the RAK811 to the Arduino Core, but I am having some problems wanting to use the module Lora with the Lmic (https://github.com/mcci-catena/arduino-lmic) or Lora (https://github.com/sandeepmistry/arduino-LoRa) libraries with pins RADIO_RF_CRX_RX PB_6 //CRF3 (ANT_SWITCH_TX_BOOST), RADIO_RF_CBT_HF PB_7 //CRF2 HF (ANT_SWITCH_TX_RFO, RADIO_RF_CTX_PA , any help is welcome

https://github.com/stm32duino/Arduino_Core_STM32/pull/229

[ivankravets]

Resolved in https://github.com/platformio/platform-ststm32/commit/f37b7c13b4520cc2c90392687eece20676ed43eb