USI_I-NUCLEO-LRWAN1

The I-NUCLEO-LRWAN1 features the USI LoraWAN module WM-SG-SM-42 with preloaded AT-Command software, and can be controlled from an external host such as NUCLEO-L053 boards. You can also develop your own application based on the I-CUBE-LRWAN to control it without external host. You just need to correct the ping definition and antenna switch logic to run the I-CUBE-LRWAN on the I-NUCLEO-LRWAN1.

The following shows how to patch the ping definition and antenna control logic:

(1) Download the I-CUBE-LRWAN 1.1.0 from the link below:

(2) Download the IO definition header file of I-NUCLEO-LRWAN from the Github link below: https://github.com/USILoRaModule/USI_I-NUCLEO-LRWAN1/blob/master/stm32l0xx_hw_conf.h.1.1.0

(3) Unzip the en.i-cube_lrwan.zip, and replace stm32l0xx_hw_conf.h with the downloaded ‘stm32l0xx_hw_conf.h.1.1.0’ depended on the working project below:

a. For AT_Master project: en.i-cube_lrwan\STM32CubeExpansion_LRWAN_V1.1.0\Projects\Multi\Applications\LoRa\AT_Master\inc\stm32l0xx_hw_conf.h b. For End_Node project:: en.i-cube_lrwan\STM32CubeExpansion_LRWAN_V1.1.0\Projects\Multi\Applications\LoRa\End_Node\inc\stm32l0xx_hw_conf.h c. For PingPong project: en.i-cube_lrwan\STM32CubeExpansion_LRWAN_V1.1.0\Projects\Multi\Applications\LoRa\PingPong\inc\stm32l0xx_hw_conf.h

(4) Correct the antenna switch logic for I-NUCLEO-LRWAN1

// 1. Replace SX1272IoInit() in sx1272mb2das.c with the code below.

void SX1272IoInit( void )

{

GPIO_InitTypeDef initStruct={0};

initStruct.Mode = GPIO_MODE_IT_RISING;

initStruct.Pull = GPIO_PULLDOWN;

initStruct.Speed = GPIO_SPEED_HIGH;

HW_GPIO_Init( RADIO_DIO_0_PORT, RADIO_DIO_0_PIN, &initStruct );

HW_GPIO_Init( RADIO_DIO_1_PORT, RADIO_DIO_1_PIN, &initStruct );

HW_GPIO_Init( RADIO_DIO_2_PORT, RADIO_DIO_2_PIN, &initStruct );

HW_GPIO_Init( RADIO_DIO_3_PORT, RADIO_DIO_3_PIN, &initStruct );

/* Initialize I-NUCLEO-LRWAN1 Antenna IO */

initStruct.Mode =GPIO_MODE_OUTPUT_PP;

initStruct.Pull = GPIO_NOPULL;

initStruct.Speed = GPIO_SPEED_HIGH;

HW_GPIO_Init( RADIO_ANT_SWITCH_PORT, RADIO_ANT_SWITCH_PIN, &initStruct );

HW_GPIO_Init( RADIO_ANT2_SWITCH_PORT, RADIO_ANT2_SWITCH_PIN, &initStruct );

}

// 2. Replace SX1272SetAntSw() in sx1272mb2das.c with the code below.

void SX1272SetAntSw( uint8_t opMode )

{

switch( opMode )
{

case RFLR_OPMODE_TRANSMITTER:

SX1272.RxTx = 1;

    /* Switch the antenna of I-NUCLEO-LRWAN1 in TX mode */

    HW_GPIO_Write( RADIO_ANT_SWITCH_PORT, RADIO_ANT_SWITCH_PIN, 1);
    
HW_GPIO_Write( RADIO_ANT2_SWITCH_PORT, RADIO_ANT2_SWITCH_PIN, 0);
    
break;

case RFLR_OPMODE_RECEIVER:

case RFLR_OPMODE_RECEIVER_SINGLE:

case RFLR_OPMODE_CAD:

default:

    SX1272.RxTx = 0;

    /* Switch the antenna of I-NUCLEO-LRWAN1 in RX mode */

    HW_GPIO_Write( RADIO_ANT_SWITCH_PORT, RADIO_ANT_SWITCH_PIN, 0);

    HW_GPIO_Write( RADIO_ANT2_SWITCH_PORT, RADIO_ANT2_SWITCH_PIN, 1);

    break;

}

}

(5) Patch is done at this step, you can make AT_Master, End_Node or PingPong project code for I-NUCLEO-LRWAN.

(6) You can test the LoraWAN connectivity with Semtech sx1301 gateway starter-kit using End_Node project code, and just need to correct the configurations below:

a. in 'en.i-cube_lrwan\STM32CubeExpansion_LRWAN_V1.1.0\Projects\Multi\Applications\LoRa\End_Node\inc\Comissioning.h':

// correct the definition below depended on your sx1301 gateway:

OVER_THE_AIR_ACTIVATION

LORAWAN_APPLICATION_EUI

LORAWAN_APPLICATION_KEY

LORAWAN_DEVICE_ADDRESS

LORAWAN_NWKSKEY

LORAWAN_APPSKEY

b. In 'en.i-cube_lrwan\STM32CubeExpansion_LRWAN_V1.1.0\Middlewares\Third_Party\Lora\Mac\region\RegionEU868.h'

#define EU868_DUTY_CYCLE_ENABLED 0 // to enabling to update node data every 10 seconds to gateway

c. In 'en.i-cube_lrwan\STM32CubeExpansion_LRWAN_V1.1.0\Middlewares\Third_Party\Lora\Core\lora.c'

#define USE_SEMTECH_DEFAULT_CHANNEL_LINEUP 1 // let the node uses DR3 on RX2