Extended OTP Test

Introduction

This example demonstrates how can one read, write and lock the extended OTP eFuses of the device. The row index for lock row is set to an invalid value. The user can determine the rows to be locked based on the device running the example. This is a special example, and is booted by ROM. Because of this it is to be treated like a bootloader application.

The example tries to write the USB VID/PID onto the OTP rows. It also dumps the OTP MMR rows. It makes use of Sciclient API calls to do this, there are wrapper functions provided in the examples for these.

Supported Combinations

Parameter

Value

CPU + OS

r5fss0-0 freertos

Toolchain

ti-arm-clang

Board

am275x-evm

Example folder

examples/otp/ext_otp/

Steps to Run the Example

  • When using CCS projects to build, import the CCS project for the required combination 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)

Sample Output

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

UART Console:
   Starting EXT OTP writer
Enabled VPP
Success programming VID/PID
OTP MMR 0: 0x4
OTP MMR 1: 0x0
OTP MMR 2: 0x0
OTP MMR 3: 0x0
OTP MMR 4: 0x0
OTP MMR 5: 0x0
OTP MMR 6: 0x0
OTP MMR 7: 0x0
OTP MMR 8: 0x0
OTP MMR 9: 0x0
OTP MMR 10: 0x0
OTP MMR 11: 0x0
OTP MMR 12: 0x0
OTP MMR 13: 0x0
OTP MMR 14: 0x0
OTP MMR 15: 0x0
OTP MMR 16: 0x0
OTP MMR 17: 0x0
OTP MMR 18: 0x0
OTP MMR 19: 0x0
OTP MMR 20: 0x0
OTP MMR 21: 0x0
OTP MMR 22: 0x0
OTP MMR 23: 0x0
OTP MMR 24: 0x0
OTP MMR 25: 0x0
OTP MMR 26: 0x0
OTP MMR 27: 0x0
OTP MMR 28: 0x0
OTP MMR 29: 0x0
OTP MMR 30: 0x45a0e047
OTP MMR 31: 0xebc80021
USB VID: 0x45a0
USB PID: 0xe047
ERROR: ext_otp_lockRow:476: Error locking OTP row 45
Lock row failed as expected for invalid row index
Success enabling global soft write lock of OTP rows
Lock status of row 0 -> global soft lock: 0x5a, hw write lock: 0xa5, hw read lock: 0xa5
All tests have passed!!