SPNA241 August 2019 RM41L232 , RM42L432 , RM44L520 , RM44L920 , RM46L430 , RM46L440 , RM46L450 , RM46L830 , RM46L840 , RM46L850 , RM46L852 , RM48L530 , RM48L540 , RM48L730 , RM48L740 , RM48L940 , RM48L950 , RM48L952 , RM57L843 , TMS570LC4357 , TMS570LC4357-EP , TMS570LC4357-SEP , TMS570LS0232 , TMS570LS0332 , TMS570LS0432 , TMS570LS0714 , TMS570LS0714-S , TMS570LS0914 , TMS570LS10106 , TMS570LS1114 , TMS570LS1115 , TMS570LS1224 , TMS570LS1225 , TMS570LS1227 , TMS570LS20206 , TMS570LS20206-EP , TMS570LS20216 , TMS570LS20216-EP , TMS570LS2124 , TMS570LS2125 , TMS570LS2134 , TMS570LS2135 , TMS570LS3134 , TMS570LS3135 , TMS570LS3137 , TMS570LS3137-EP
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CAN Bus Bootloader for Hercules Microcontrollers
- Trademarks
- 1 Introduction
- 2 Hardware Requirements
- 3 CAN Settings
- 4 Software Coding and Compilation
- 5 Exception Vector Table
- 6 ECC Generation for Bootloader Code
- 7 ECC Generation for Application Code
- 8 During Bootloader Execution
- 9 Bootloader Flow
- 10 CAN Bootloader Operation
- 11 CAN Bootloader Protocol
- 12 Create Application for Use With the Bootloader
- 13 Sample Code for PC-Side Application
- 14 References
1 Introduction
The CAN bootloader is a small piece of code that resides at the beginning of flash to act as an application loader. It downloads the application through CAN bus, a reliable operation in automotive and industrial control networks. The bootloader also helps designers update the user application for products already deployed in the field.
This document describes how to work with and customize the Hercules CAN bootloader application. Since full source code is provided, the bootloader can be completely customized.
The bootloader on the target device configures the CAN module in communication with PC host through the CAN bus. The bootloader polls the CAN port for messages. After a message is received, the bootloader attempts to decode the incoming commands for flash programming. After the bootloader has successfully downloaded and programmed the whole application image, the bootloader updates the application header. The bootloader jumps to the starting address of the new application image.
The CAN bootloaders for Hercules devices (TMS570LSx, TMS570LCx, RM4x, and RM5x) have been built and validated using Code Composer Studio™ v9 on the Hercules HDKs. The bootloader host application is developed with Visual C++ 2010. Figure 1 and Table 1 show an overview of the source code provided with the bootloader.
Table 1. List of Source Code Files Used in CAN Bootloader
| bl_main.c | The main control loop of the bootloader |
| bl_dcan.c | The functions for transferring data via the CAN port |
| bl_check.c | The code to check if a firmware update is required, or if a firmware update is being requested. |
| bl_link.cmd | The linker script used when the Code Composer Studio compiler is being used to build the bootloader. |
| bl_flash.c | The functions for erasing, programming the Flash, and functions for erase and program check |
| bl_commands.h | The list of commands and return messages supported by the bootloader. |
| bl_config.h | Bootloader configuration file. This contains all of the possible configuration values. |
| bl_flash.h | Prototypes for Flash operations |
| bl_can.h | Prototypes for the CAN transfer functions. |
| flash_defines.h | Flash memory banks and sectors for Hercules microcontrollers |
| HALCoGen generated files | Device initialization |