TMS320F28335: SCI boot

Phaniendra Kundeti

Part Number: TMS320F28335

I was going through bootloader doc for serial boot. My goal is to serial flash the MCU. I have a doubt if i set my boot sel pin config for SCI boot mode, and if no host application is running to initiate the boot process, then will the boot loader jump to flash entry point by default. Because i didnt see any time out in the serial boot code given in spru963a SCI_boot() function call page no.83. Kindly clarify. My requirement is on host application connection code should be flashed and non availability of the same it should jump to flash entry point.

over 8 years ago

0 Sal Pezzino over 8 years ago

TI__Mastermind 32995 points

There is no timeout. The SCI bootloader will wait for an autobaud lock. After an autobak lock, if the first characters do not match the key 0x08AA then the SCI bootloader will branch to flash.

One thing you can do is to always branch to flash and at the start of your flash application you can wait for an external signal. If that signal occurs then you can branch to the SCI_boot() function in ROM. Otherwise on a time-out continue with your flash application.

sal

0 Phaniendra Kundeti over 8 years ago in reply to Sal Pezzino

Intellectual 260 points

Is there any other better method other than including this in Application code. I need to make it independent of Application code. What if I create an .asm to call SCI_boot() function just before c_int00 executes.

0 Sal Pezzino over 8 years ago in reply to Phaniendra Kundeti

TI__Mastermind 32995 points

You will still have the same problem of no time-out.

sal

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TMS320F28335: SCI boot