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Forum Post: SCI boot on C2000 LaunchpadXL TMS320F2802x

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Hey community,

I got a LaunchPad XL with the TMS320F2802x. Now I am trying to boot from the SCI.

Virtual COM port (VCP) for channel B is acitve and listed in the device manager as COM22

Here are my settings:

Terminal: COM22, 38400, 8N1

LaunchPad XL: S1 = ON, DIP switch 1 = ON, 2 = OFF and 3 = OFF

This should be equivalent to GPIO34 = 1, GPIO37 = 0 and TRST = 0 which should be the boot mode "Boot from SCI" like in the documentation of the C2802x.

The board is connected via USB and the power LED is on. The VCP is available and I connect to it via terminal. If I'am not wrong, after sending the character 'a' or 'A' to the LaunchPad XL it should answer also with a character like 'a' or 'A' isn't it so?

The problem is, that I get no character back from the LaunchPad XL. What I figured out is, that the character send to the LaunchPad will not arrive the uController. This is due to the isolation IC ISO7240C. If I assembly a bridge from Pin 6 of that device to connect the GPIO28 directly to RX I get a answer from the uController as expected.

The Problem is only present for the boot mode. The normal communication was working fine.

Can anybody reproduce this problem?

Kind regards

Pascal


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