LR1121 Modem-E driver

This project proposes an implementation in C of the drivers for LR1121 Modem-E.

It does not involve any state machine or high level API.

Firmware compatibility

This driver is known to be compatible with firmware LR1121 Modem v2.0.2.

Components

The driver is split in several components:

• Transceiver components
  • Bootloader
  • System configuration
  • Register / memory access
  • Direct radio access
  • LR-FHSS
• Modem components
  • Board specific package (BSP)
  • LoRaWAN modem
  • Relay

The transceiver commands are available only if the modem is set to suspended state (by calling lr1121_modem_set_suspend), except for:

• all register and memory access commands
• the following system commands:
  • lr1121_modem_system_get_version
  • lr1121_modem_system_set_reg_mode
  • lr1121_modem_system_set_dio_as_rf_switch
  • lr1121_modem_system_set_dio_irq_params
  • lr1121_modem_system_cfg_lfclk
  • lr1121_modem_system_set_tcxo_mode
  • lr1121_modem_system_reboot
  • lr1121_modem_system_get_vbat
  • lr1121_modem_system_get_temp
  • lr1121_modem_system_get_random_number
  • lr1121_modem_system_read_uid
  • lr1121_modem_system_read_join_eui
  • lr1121_modem_system_read_pin

HAL integration

The SPI commands this driver requires are documented in the file lr1121_modem_hal.h and lr1121_hal.h.

All driver commands are using the HAL from lr1121_modem_hal.h except the bootloader ones that are using the ones from lr1121_hal.h.