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Jump in memory issue in C on STM32L152

Question asked by thib.glo on Jul 3, 2015
Hello everyone,

I made a custom bootloader for my stm32L1 but my problem resides in jumping at the beginning of the flash when my new binary file is loaded.

I made some research on this subject.. the PC and the MSP register need to be changed with the new address.
Here is the function I made to jump in memory but it doesn't work and I don't understand why..


t_error Jump_to_app(pFunction Jump_To_Application, uint32_t JumpAddress) {

if (((*(__IO uint32_t*) WRITE_START_ADDR) & 0x2FFE0000) == 0x20000000) {
          JumpAddress = *(__IO uint32_t*) 0x08000004;
          Jump_To_Application = (pFunction) JumpAddress;
          __set_MSP_BOOT(*(__IO uint32_t*) 0x08000000);
          Jump_To_Application();
     } else {
          return (NOK);
}
     return (OK);

This function doesn't work but when I press the RESET button, the jump works and my binary is executed.. but I can't figure why this function doesn't do the magic..

I checked on the Eclipse debugger the value of the MSP register seems to be good : 00400120 
Maybe the PC register is not modified.. I really have no ideas 
If someone knows a way to made simples jump in memory using C, it would be very helpfull !!!

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