RAK4630 schematic_

WisBlock
1

HI,

I’am trying to port the Semtech SX126x Stack without Arduino environment on the RAK4631 as I’am porting an existing projet that do not come with Arduino framework.
Where can I found the RAK4630 nrf52840 <-> SX1276 SPI/DIO pins mapping ?
I can’t find any document about the RAK4630 (except the FCC ID User manual, but no schematics).
Is it the same as the RAK4600 mapping (even if it use the nrf52832) ?

Thanks for help,
BR,

2

Hi @bobmorane83 , welcome to the forum.

The pin mapping can be found in the SX126x-Arduino library
As it is a generic initialization, it is a little bit difficult to get all the details:

  • DIO2 of the SX1262 is programmed as antenna switch
  • GPIO37 is used as power for the antenna switch.
  • Usage of TCXO is enabled and controlled over DIO3 of the SX1262
  • GPIO39 is connected to the RESET of the SX1262
  • GPIO46 is connected to the BUSY pin of the SX1262
  • SPI is connected as
    • GPIO42 NSS
    • GPIO32 SCLK
    • GPIO45 MISO
    • GPIO44 MOSI
3

Hi @beegee , thanks for your answer.
I think there is some typo with RESET and SCLK.
Just to clarify :

#define PIN_LORA_DIO_1          47      // LORA DIO_1 :     NRF_GPIO_PIN_MAP(1,15)
#define PIN_LORA_RESET          38      // LORA RESET :     NRF_GPIO_PIN_MAP(1,6)
#define PIN_LORA_SCLK           43      // LORA SPI CLK :   NRF_GPIO_PIN_MAP(1,11)
#define PIN_LORA_NSS            42      // LORA SPI CS :    NRF_GPIO_PIN_MAP(1,10)
#define PIN_LORA_MISO           45      // LORA SPI MISO :  NRF_GPIO_PIN_MAP(1,13)
#define PIN_LORA_MOSI           44      // LORA SPI MOSI :  NRF_GPIO_PIN_MAP(1,12)
#define PIN_LORA_BUSY           46      // LORA SPI BUSY :  NRF_GPIO_PIN_MAP(1,14)
#define PIN_RX_ANT_SWITCH       37      // LORA RX ANTENNA SWITCH : NRF_GPIO_PIN_MAP(1,5)
#define PIN_TX_ANT_SWITCH       39      // LORA TX ANTENNA SWITCH : NRF_GPIO_PIN_MAP(1,7)

Why can’t we find the schematics ?

Thanks,
BR

4

There is no typo.

GPIO39 is defined but not used because DIO2 is used for switching the antenna.

The schematics are not made public. Company decision.

5

Sorry, but I’am confused :

In the file board.cpp I can read :
#define PIN_LORA_RESET 38 // LORA RESET
and in your first post :
GPIO39 is connected to the RESET of the SX1262
which one is correct ?

I can also read :
#define PIN_LORA_SCLK 43 // LORA SPI CLK
and in your first post :
GPIO32 SCLK
which one is correct ?

But I understand that GPIO39 is defined but not used. Does it mean that DIO2 switch TX and RX antenna ?

Thanks,
BR,

6

Sorry for that,
board.cpp is the correct one

8

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