ST STEVAL-IHP007V1 Manuale utente

December 2016 DocID026935 Rev 3 1/47

UM1818

User manual

Street lighting power line modem evaluation board based on

ST7580 PLM and STM32 microcontroller

Introduction

This document explains how to use and set up the firmware and the software designed for

the STEVAL-IHP007V1 board and all the necessary setup for using the hardware.

The system is based to the ST7580 data link protocol firmware, data link protocol described

in the application note AN4018. ST7580 data link protocol firmware is organized in a layer

structure. A dedicated layer allows the user to design its own application interfacing to the

evaluation board features with very simple and easy to use APIs.

Dedicated software graphic user interface (GUI) allows the user to use all the embedded

features interfacing the PLM evaluation board with the PC via an RS232 communication

port.

This firmware is developed using STM32F10x standard peripherals library Rel.3.5.0 and

IAR Embedded Workbench

IDE for STM32 microcontrollers Rel. 6.50x

The STEVAL-IHP007V1 hardware evaluation board embeds an ARM 32-bit Cortex™-M3

core-based STM32F103xB and an ST7580 PSK multi mode power line networking system-

on-chip.

Figure 1. STEVAL-IHP007V1 evaluation board

www.st.com

Contents UM1818

2/47 DocID026935 Rev 3

Contents

1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Firmware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2 Remote firmware update (RFU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.3 Firmware download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.4 Firmware architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4.5 Firmware data types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.6 Firmware frame types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.6.1 Communication frames types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.6.2 Ping frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.6.3 Error frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.6.4 Service frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Appendix A HID commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Appendix B Schematic diagrams and bill of material. . . . . . . . . . . . . . . . . . . . . 35

B.1 Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

B.2 Bill of material (BOM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Appendix C CRC 16 calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

DocID026935 Rev 3 3/47

UM1818 Features

1 Features

•Configurable PSK power line modem interface with an embedded firmware stack for a

complete power line communication management

•8 user configurable general purpose input/output pins

•USART communication channel for evaluation board interfacing

•Internal configurable RTC evaluation board with lithium backup battery

•Programmable user data and PLM parameters Flash memory area

•Remote firmware update

•Embedded AES 128 encryption evaluation board with programmable AES Key

Description UM1818

4/47 DocID026935 Rev 3

2 Description

The STEVAL-IHP007V1 block diagram is shown in Figure 2. The general purpose power

line modem evaluation board is based on an ST7580 x-PSK power line modem device and

an ARM 32-bit Cortex™-M3 core based STM32F103xB microcontroller. The PLM

evaluation board is a fully functional communication evaluation board, with 8 programmable

I/Os, a real time clock and a Flash memory area for modem parameters and user data

storage. The firmware structure is made up of several layers, each dealing with a different

feature. The application layer engine is the general interface between the user program and

all the parts of the evaluation board. It manages the communication ports, the evaluation

board peripherals such as SCI, RTC, I/Os, LEDs and timing management. It is also the

interface between the PLM communication protocol and the user application layer. The PLM

communication protocol, itself made up of several layers, implements and manages the

power line communication, manages the conflicts, timing and repetitions, the addressing,

and so on. Please refer to AN4018 for details on the ST7580 communication protocol

features and application services provided. Some features are managed directly by the

application engine, and are transparent to the user, such as the RTC management or the

board parameter update, as well as the board programming and configuration, which is

done by particular programming or service commands managed and acknowledged directly

by the application engine. Even the remote firmware update is managed by the application

engine and allows the firmware being update remotely by power line modem.

The STEVAL-IHP007V1 is powered by a dual regulated DC power source, +12VDC (pin 1)

and +3.3 VDC (pin 2) from the power supply connector (J2). The pin 3 is the ground.

The communication is done via power line, which is applied to the board using the J1

connector, where the pin 1 must be connected to the neutral wire while the pin 3 to the

phase wires (refer to the Appendix A).

Figure 2. STEVAL-IHP007V1 block diagram

It is possible to connect the evaluation board in a three phase line (in case of

communication modules are connected in all three phases), in this case an external

DocID026935 Rev 3 5/47

UM1818 Description

capacitor of 220 nF X1 must be connected to any additional phase, and then the other side

of capacitors together with the common pin 5 of the J2 connector, following the schematic

shown in the Figure 3, and the 0 Ωresistor R1 must be mounted.

Figure 3. Three phase connection

The GP PLM module is provided of a user interface (J3) shown in Figure 4 where there are

connected the SPI interface pins (MOSI, MISO, SCK and NSS), the RS232 interface pins

(Tx and Rx), the USB interface pins (D+ and D-) and the user programmable general

purpose I/O pins. Remark that those pins are directly connected to the microcontroller, so be

careful to provide the correct insulation and

protection depending on the use those pins are addressed.

It is possible to power the PLM using the +3.3 VDC (pin 19), +12 VDC (pin 20 or 22) and

GND (pins 17, 23, 20 and 24) of this connector instead of the connector J2, using only a

single connector for power supply and control signals.

A lithium backup battery mounted on the board and 32 kHz quartz allows the use of the full

functionality of the internal RTC of the microcontroller, allowing precise time-based

operations.

Description UM1818

6/47 DocID026935 Rev 3

Figure 4. User interface connector

A two color LED allows the signaling the board operations, data transmission and reception.

Finally, a programming connector allows the firmware download and debug, even if it is

possible to use the remote firmware update feature to remotely update the firmware using

the PLM, as described further in this user manual. If the IAR - JLINK/JTRACE is used for the

firmware downloading, a simple JTAG adapter is necessary. The Figure 5 shows the

adapter schematics.

Figure 5. Programming connector JTAG adapter

PLM_GPIO0

PLM_GPIO1

PLM_GPIO2

PLM_GPIO3

PLM_GPIO4

PLM_GPIO5

PLM_GPIO6

PLM_GPIO7

BOOT0

SPI_ MOSI

SPI_ MISO

SPI_S CK

SPI_ NSS

USB_ DM

USB_ DP

USART_TX

USART_RX

VDDIOVCC

910

1112

1314

1516

1718

1920

2122

2324

TSW-112-08-L-D- RA

GSPG23072015DI1045

DocID026935 Rev 3 7/47

UM1818 Hardware installation

3 Hardware installation

Connect a regulated dual DC power supply to the power source pins of the connector J3 as

described previously and power the board.

In order to download the firmware, plug the programmer adapter (Figure 5) in the

programming connector J1 and the IAR J-Link programmer in the JTAG connector of the

adapter.

Refer to the chapter firmware description (paragraph 6.3 for the firmware download

procedure). As soon as the application is launched, the LEDs should quickly switch on

indicating that the board has to be configured.

Firmware description UM1818

8/47 DocID026935 Rev 3

4 Firmware description

4.1 Introduction

The firmware structure is constituted of several layers each of it taking care of a different

feature. The application layer engine is the general interface between the user program and

all the parts of the module. It takes care of the communication ports, the board peripherals

as RTC and I/Os, and timing management. It is also the interface between the PLM

communication protocol and the user program. The PLM communication protocol, itself

constituted by several layers, implements and manages the power line communication,

manages the conflicts, timing and repetitions, the addressing and so on.

Some features are managed directly by the application engine, and are transparent to the

user, as well as the board programming and configuration, which is done by particular

programming or service commands managed and acknowledged directly by the application

engine, the RTC management, the board parameter or the firmware update.

The user application can be interfaced to the application engine by simples APIs used for

the data transfer and the evaluation board interface. The Figure 6 shows the firmware

structure.

Figure 6. Firmware structure

The file user.c/h and application.c/h are the owner of application management, this manage

the data flow from/to the PLM physical and from/to the UART side.

4.2 Remote firmware update (RFU)

The remote firmware update (RFU) uses the power line modem as external communication

channel for receiving a new firmware dump. The firmware dump is placed in the internal

Flash memory of the microcontroller. Hence, the total memory size of the microcontroller

must be at least the double of the estimated maximum size of the firmware application (in

this application is set to 60 kbytes), plus 4 Kb of additional memory for a bootloader. The

Figure 7 shows the microcontroller memory organization.

The bootloader is loaded at the startup and checks the active segment containing the actual

firmware. The implemented mechanism uses three partitions of the microcontroller’s Flash

DocID026935 Rev 3 9/47

UM1818 Firmware description

memory, one containing the bootloader and two containing the actual running firmware

(active image) and the new firmware as soon as a RFU is needed.

As soon as the firmware transfer is completed, a “swap” command sent from the remote

PLM causes the target PLM to check first the integrity of the firmware dump (actually a

checksum is calculated and compared with the one sent by the remote PLM), and after the

reset vector address of the new firmware is written in a dedicated Flash segment of the

bootloader. Last the microcontroller is self reset, and the new firmware executed.

Figure 7. Memory organization

The RFU protocol manages the RFU “start”, “get new firmware segment” (with the segment

address) and “swap” commands. The protocol is not embedded in the bootloader, hence it

can be updated with the new firmware, bust the user must be careful in the modifications as

any bugs can compromise the RFU mechanism.

As soon as a new firmware segment is received, the RFU manager checks if the address is

within the firmware interrupt vector table. If it is the case, an offset depending on the free

firmware image (1 or 2) allocation is added to each interrupt vector before being written in

the free image Flash area.

In the Figure 8 is shown the RFU flowchart.

Firmware description UM1818

10/47 DocID026935 Rev 3

Figure 8. RFU flowchart (1of 2)

Figure 9. RFU flowchart (2 of 2)

4.3 Firmware download

In the setup directory there are different workspaces stored in different directories. In order

to implement the remote firmware update feature it is necessary to download the project

located in the workspace “Firmware - Application and Bootloader”. This workspace contains

two different projects, one is the bootloader and the other one is the application itself. If the

board has never been programmed, this workspace must be downloaded before.

Open the IAR Embedded Workbench

IDE for STM32 microcontrollers Rel. 6.50 (or a more

recent release). Click File\Open\Workspace and load the following workspace placed in the

directory selected during the setup file installation: “Firmware - Application and

Bootloader\EWARM\Project.eww”. Verify that the application project is the active project

(the project name must be in bold), otherwise select the active project in the list below the

workspace (Figure 10).

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