This is the documentation for the latest (master) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Ronoth LoDev

Overview

The Ronoth LoDev is a small open source board containing a AcSIP S76S SiP from AcSIP. The full LoDev design details are available on on GitHub. The LoDev board can be purchased from Ronoth or from CrowdSupply.

The S76S contains an STMicro STM32L073RZ MCU, a Semtech SX1276 LoRaWAN transceiver, and a +20 dBm power amplifier. Refer to AcSIP S76S Product Information Brief for details.

Zephyr applications may use the ronoth_lodev configuration to run on this board.

Image of Ronoth LoDev open source development board containing S76S system on a chip

Ronoth LoDev

Board design files are available on GitHub.

Device Resources

The embedded STMicro STM32L073RZ has some GPIOs and SPI2 internally committed to the LoRaWAN transceiver operation. See internally dedicated ports for a list of resources committed to this function.

Debugging

Programming and debugging uses the SWD port, as on any STM32 processor. An ST-LINK/V2 adapter may be used with the appropriate software (st-utils package on Linux).

Connector Pin-Out

The LoDev has two rows of headers. Pin 1 on both connectors is closest to the micro-USB connector on the board, furthest from the RF (antenna) connector.

When viewed from the top (component) side of the board, with the micro-USB connector closest and RF (antenna) connector furthest away, the CN6 connector is on the left, the CN7 connector is on the right.

UART1 on the S76S SiP is connected to a USB-to-UART device connected to the micro USB connector, so generally PA9 and PA10 are unavailable for I/Os.

A helpful silkscreen legend is provided on the board.

Ronoth LoDev sketch with pinout

Ronth LoDev Pinout

CN6 Pin-Out

Pin

Function

Note

1

3.3V

Output 500 mA max

2

GND

3

PC1

4

PC0

5

PB8

6

BOOT0

7

PB7

8

PB6

9

PB5

10

PD2

11

PC12

12

PC11

13

PC10

14

PA14

SWCLK

15

PA13

SWDIO

16

PA12

17

PA11

18

PA9

USB serial Tx drives this pin (input) for UART1

19

PA10

USB serial Rx is driven by this pin (output) for UART1

20

PA8

CN7 Pin-Out

Pin

Function

Note

1

PC2

2

PC3

3

nRESET

4

PA0

5

PA2

6

PA3

7

PA4

8

PA5

9

PA6

10

PA7

11

PC4

12

PC5

13

PB0

14

PB1

15

PC6

16

PC7

17

PC8

18

PC9

19

GND

20

PA1

Used in S76S as “RF FEM CPS”

Internally Dedicated Ports

Pin name

Pin Type

I/O Structure

Note

Function

PA15

I/O

FT

INTERNAL SX1276 D5

PB3

I/O

FTf

INTERNAL SX1276 D4

PB4

I/O

FTf

INTERNAL SX1276 D3

PB9

I/O

FTf

INTERNAL SX1276 D2

PB10

I/O

FT

INTERNAL SX1276 Reset

PB11

I/O

FT

INTERNAL SX1276 D0

PB12

I/O

FT

INTERNAL SX1276 SPI nCS

PB13

I/O

FTf

INTERNAL SX1276 SPI2_SCK

PB14

I/O

FTf

INTERNAL SX1276 SPI2_MISO

PB15

I/O

FT

INTERNAL SX1276 SPI2_MOSI

PC13

I/O

FT

INTERNAL SX1276 D1

References

License

This document Copyright (c) 2021 Dean Weiten <dmw@weiten.com>

SPDX-License-Identifier: Apache-2.0