B-L072Z-LRWAN1 SX1276 DIO pins mapping - Need verification

[Ikram_safia11]

 

Problem Description

I'm working with the B-L072Z-LRWAN1 development board and trying to configure the SX1276 LoRa transceiver DIO pins manually (without using ST's HAL middleware). I want to use an external LoRaWAN library (LDL) that requires explicit DIO pin configuration.

Current Configuration

Based on my research, I have the following pin mapping:

 

 

c

#define DIO0_PIN GPIO_PIN_4 // PA4
#define DIO1_PIN GPIO_PIN_1 // PB1 
#define DIO2_PIN GPIO_PIN_0 // PB0
#define DIO3_PIN GPIO_PIN_2 // PC2
#define DIO4_PIN GPIO_PIN_3 // PC3
#define DIO5_PIN GPIO_PIN_5 // PC5

Questions

1. Are these DIO pin mappings correct for the B-L072Z-LRWAN1 board?
2. Which DIO pins are actually connected/used on this board? (I understand some may not be connected)
3. Where can I find the official schematic or documentation that shows the exact DIO pin connections?

[Tesla DeLorean]

There's a schematic for the DISCO board under CAD Resources, but the module is made by Murata.

The mlm32l0x_hw_conf.h file should have the pin definitions, both for the DIO and RF Mux. I think DIO4/DIO5 aren't used and perhaps clash with ADC/DAC type operation.

Most cases only a couple or the DIO are used

//#define RADIO_DIO_4
//#define RADIO_DIO_5

/* LORA I/O definition */

#define RADIO_RESET_PORT GPIOC
#define RADIO_RESET_PIN GPIO_PIN_0

#define RADIO_MOSI_PORT GPIOA
#define RADIO_MOSI_PIN GPIO_PIN_7

#define RADIO_MISO_PORT GPIOA
#define RADIO_MISO_PIN GPIO_PIN_6

#define RADIO_SCLK_PORT GPIOB
#define RADIO_SCLK_PIN GPIO_PIN_3

#define RADIO_NSS_PORT GPIOA
#define RADIO_NSS_PIN GPIO_PIN_15

#define RADIO_DIO_0_PORT GPIOB
#define RADIO_DIO_0_PIN GPIO_PIN_4

#define RADIO_DIO_1_PORT GPIOB
#define RADIO_DIO_1_PIN GPIO_PIN_1

#define RADIO_DIO_2_PORT GPIOB
#define RADIO_DIO_2_PIN GPIO_PIN_0

#define RADIO_DIO_3_PORT GPIOC
#define RADIO_DIO_3_PIN GPIO_PIN_13

#ifdef RADIO_DIO_4
#define RADIO_DIO_4_PORT GPIOA
#define RADIO_DIO_4_PIN GPIO_PIN_5
#endif

#ifdef RADIO_DIO_5
#define RADIO_DIO_5_PORT GPIOA
#define RADIO_DIO_5_PIN GPIO_PIN_4
#endif

#define RADIO_TCXO_VCC_PORT GPIOA
#define RADIO_TCXO_VCC_PIN GPIO_PIN_12

#define RADIO_ANT_SWITCH_PORT_RX GPIOA //CRF1
#define RADIO_ANT_SWITCH_PIN_RX GPIO_PIN_1

#define RADIO_ANT_SWITCH_PORT_TX_BOOST GPIOC //CRF3
#define RADIO_ANT_SWITCH_PIN_TX_BOOST GPIO_PIN_1

#define RADIO_ANT_SWITCH_PORT_TX_RFO GPIOC //CRF2
#define RADIO_ANT_SWITCH_PIN_TX_RFO GPIO_PIN_2