TMS320F280041: SCI Boot Mode - not able to load firmware

I'm using C2Prog to load firmware thru the SCI port. This design is similar to previous designs I've worked with. C2Prog times out with "Connect with autobaud failed."

The SCI port works fine for normal communication when the device boots from flash.
The hardware has a 3V3 pullup on GPIO_24 and GPIO_32.
There's a jumper to GND on GPIO_24
On power up, the scope shows a 4ms rise time on the 3.3V and GPIO_32. GPIO_24 stays low.
With the jumper installed, the device does not boot from Flash (that's expected), but I don't know how to verify if it is in SCI boot mode.

The device loads fine from JTAG and operates normally from Flash.

Using the same C2Prog configuration and hex file, I successfully flashed a different product with the same DSP for validation.

Is there a way to check the actual boot mode? Are there any obvious things to check first before overthinking it?

5 months ago

0 Matt Kukucka 5 months ago

TI__Mastermind 20380 points

Hello,

You can emulate the standalone boot configurations with the EMU_BOOTPIN_CONFIG and EMU_BOOTDEF_LOW/HIGH registers. With emulation boot, you can view the boot status with a debug probe connected and verify SCI boot is entered. Please refer to SPRUJH3 for details on these registers.

Additionally, can you confirm which SCI Rx/Tx GPIOs you intend to use?

Best,
Matt

0 JT 5 months ago in reply to Matt Kukucka

Prodigy 90 points

GPIO16/17 is used for SCI.

*On previous designs, GPIO28/29 has been used.

+1 Matt Kukucka 5 months ago in reply to JT

TI__Mastermind 20380 points

Hello,

That is the issue. The default SCI boot uses GPIO28/29, if you wish to use GPIO16/17 you must program the OTP. That process is also detailed in the above user's guide.