SLAU887 February   2023 MSPM0G1105 , MSPM0G1106 , MSPM0G1107 , MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G3105 , MSPM0G3105-Q1 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3505 , MSPM0G3505-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1 , MSPM0L1105 , MSPM0L1106 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346

 

  1.   Abstract
  2.   Trademarks
  3. 1Overview of BSL Features
  4. 2Terminology
  5. 3BSL Architecture
    1. 3.1 Design
      1. 3.1.1 Timeout Feature
        1. 3.1.1.1 Interface Autodetection
        2. 3.1.1.2 Command Reception
    2. 3.2 BSL Invocation
      1. 3.2.1 Blank Device
      2. 3.2.2 Application Request
      3. 3.2.3 GPIO Based Invocation
      4. 3.2.4 Debug Mailbox Command
      5. 3.2.5 Others
        1. 3.2.5.1 Pre-Boot Application Verification
    3. 3.3 Memory
      1. 3.3.1 SRAM Memory Usage
    4. 3.4 BSL Configuration
    5. 3.5 BSL Status
  6. 4Bootloader Protocol
    1. 4.1 Packet Format
    2. 4.2 UART and I2C BSL Protocol
      1. 4.2.1 BSL Acknowledgment
      2. 4.2.2 Peripheral Configuration
        1. 4.2.2.1 UART
        2. 4.2.2.2 I2C
        3. 4.2.2.3 CRC
    3. 4.3 Bootloader Core Commands
      1. 4.3.1  Connection
      2. 4.3.2  Get Device Info
      3. 4.3.3  Unlock Bootloader
      4. 4.3.4  Program Data
      5. 4.3.5  Program Data Fast
      6. 4.3.6  Readback Data
      7. 4.3.7  Flash Range Erase
      8. 4.3.8  Mass Erase
      9. 4.3.9  Factory Reset
      10. 4.3.10 Standalone Verification
      11. 4.3.11 Start Application
      12. 4.3.12 Change Baud Rate
    4. 4.4 BSL Core Response
      1. 4.4.1 BSL Core Message
      2. 4.4.2 Detailed Error
      3. 4.4.3 Memory Readback
      4. 4.4.4 Device Info
      5. 4.4.5 Standalone Verification
    5. 4.5 Bootloader Security
      1. 4.5.1 Password Protected Commands
        1. 4.5.1.1 Security Alert
      2. 4.5.2 BSL Entry
  7. 5Sample Program Flow with Bootloader
  8. 6Secondary Bootloader
    1. 6.1 Secondary Bootloader Example
  9. 7Interface Plug-in
    1. 7.1 Implementation
      1. 7.1.1 Init
      2. 7.1.2 Receive
      3. 7.1.3 Transmit
      4. 7.1.4 Deinit
      5. 7.1.5 Important Notes
    2. 7.2 Flash Plug-in Type
    3. 7.3 Overriding an Existing Interface
      1. 7.3.1 UART Interface Flash Plug-in Example
  10. 8References
  11. 9Revision History

7.3.1 UART Interface Flash Plug-in Example

A sample flash plug-in that uses UART communication, is given as part of SDK examples SDK for reference. This section gives more details on that.

Description

UART interface flash plug-in handles the data transaction between the BSL host and the ROM BSL through the following 4 API Hooks.

  • BSL_PI_UART_init
  • BSL_PI_UART_receive
  • BSL_PI_UART_send
  • BSL_PI_UART_deinit

The UART flash plug-in is primarily used to override the ROM BSL UART interface with custom implementation when there is a need.

Example Usage

  • Connect UART_RX and UART_TX with the BSL Host (any microcontroller with UART interface).
  • Compile and load the example.
  • Create BSL invocation condition using BSL Invoke pin or any other invocation methods.
  • Send Connection command from the host. A BSL acknowledgment is received on success.
  • Send GetDeviceInfo command from the host.
  • BSL responds with the UART interface flash plug-in version information.
  • Similarly send erase, program, verification commands to program data in the memory.

Software File Details

File NameDetails
bsl_uart.cHandles the communication between the host and the BSL core. Defines the four interface APIs Init, Receive, Send and Deinit.
bsl_uart.hContains definitions of BSL acknowledgment and function declarations of bsl_uart.c
ti_msp_dl_config.hContains device specific configurations like UART pins, clock configurations, and others.
boot_config.hContains BCR and BSL configuration structure
startup_mspm0x_ticlangStartup file that contains only the default handler function definition. Unlike a typical startup file does not have interrupt vector table or reset handler, because these features are never used in the flash plug-in and are removed to reduce the memory consumption.
mspm0x.cmdLinker command file that specifies memory region where the flash plug-in image resides in the memory and the SRAM region for operation.

Customization

This example gives a reference implementation for a flash plug-in. It can be customized as needed. The interface flash plug-in APIs are the major places of change.

Steps to be followed:

  • Modify the flash plug-in APIs as needed
  • When the changes are done, compile the code
  • Calculate the CRC for the BSL configuration if the API pointers are updated
  • Modify the flash write protection settings in BCR configuration as appropriate
  • Calculate the CRC for BCR configuration
  • Store the new CRC in the BCR and BSL configuration.
  • Compile the code again.
  • Load the flash plug-in image