STM32F103 HD - Initial Stack Pointer is Wrong

Bill Lewis · ‎2013-07-07

Posted on July 07, 2013 at 18:55

I'm trying to set up a project (Eclipse, gcc, OpenOCD) for a hand made prototype board using an STM32F103RC chip (48K RAM). It works, sort of. My linker script specifies the initial stack pointer as

_estack = 0x2000C000;

And that shows up in the .hex file. But when the debugger starts up, SP contains 20005000.

Any ideas why that would happen?

-Bill

Bill Lewis · ‎2013-07-07

Posted on July 07, 2013 at 23:13

I had a hardware mistake.

I forgot to put on the jumper for BOOT0, so it was pulled high. BOOT1 was floating.