TAMAGAWA Diagnostic

Introduction

The Tamagawa receiver firmware running on ICSS-PRU provides a defined well interface to execute the Tamagawa protocol. The Tamagawa diagnostic application described here interacts with the Tamagawa receiver firmware interface.

Tamagawa diagnostic application does below,

• Configures pinmux, GPIO, UART, ICSS clock to 200MHz,
• Initializes ICSS0-PRU1,
• Loads the initialization section of PRU firmware & executes it.

This application is controlled with a terminal interface using a serial over USB connection between the PC host and the EVM. Please connect a USB cable between the PC and the EVM. A serial terminal application (like teraterm/ hyperterminal/ minicom) is then run on the host. To configure, select the serial port corresponding to the port emulated over USB by the EVM. The host serial port should be configured to 115200 baud, no parity, 1 stop bit and no flow control. Connect the Tamagawa encoder via RS485 transceiver to the EVM. The connections between EVM and RS485 logic signals are:

• PRU UART Rx -> PRG0_PRU1_GPO9
• PRU UART Tx -> PRG0_PRU1_GPO10
• Tx Enable -> PRG0_PRU1_GPO0

It is necessary to provide 3.3V to the RS485 logic side. The receive transceiver is always kept enabled with bus side connected as in Tamagawa Specification.

The Tamagawa receiver firmware running on ICSS0-PRU1 provides a defined interface. The Tamagawa diagnostic application interacts with the Tamagawa receiver firmware interface. It then presents the user with menu options to select Data ID code (as defined by Tamagawa) to be sent to the encoder. The application collects the data entered by the user and configures the relevant interface. Then via the Tamagawa receiver interface, the command is triggered. Once the command completion is indicated by the interface, the status of the transaction is checked. If the Status indicates success, the result is presented to the user.

Features Supported

• PRU Tamagawa receiver Firmware source in C
• Supports full-absolute SmartAbs & SmartInc encoders compatible with Smartceiver AU5561N1
• 2.5Mbps encoder support
• Supports all Data readout & Reset frames

SysConfig Features

Note

It is strongly recommend to use SysConfig where it is available instead of using direct SW API calls. This will help simplify the SW application and also catch common mistakes early in the development cycle.

SysConfig can be used to configure things mentioned below:

• Selecting the ICSSG0PRUx instance.(Tested on ICSSG0-PRU1)
• Configuring PINMUX.

Features Not Supported

In general, peripherals or features not mentioned as part of "Features Supported" section are not supported, including the below

• EEPROM commands
• Other baud rates.

Important files and directory structure

Folder/Files	Description
${SDK_INSTALL_PATH}/examples/motor_control/tamagawa_diagnostic
tamagawa_diagnostic.c	Tamagawa diagnostic application
${SDK_INSTALL_PATH}/source/motor_control/position_sense/tamagawa
firmware/	Folder containing TAMAGAWA PRU firmware sources.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 freertos
ICSSG	ICSSG0
PRU	PRU1
Toolchain	ti-arm-clang
Board	am64x-evm
Example folder	examples/motorcontrol/tamagawa_example

Steps to Run the Example

Hardware Prerequisites

• AM64x/AM243x EVM.
• RS485 half-duplex EVM.
• Tamagawa Encoder.

Hardware Setup

Hardware Setup

Build, load and run

• When using CCS projects to build, import the CCS project and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
• Refer to UART terminal for user interface menu options.

Sample Output

Shown below is a sample output when the application is run:

Tamagawa Sample Output