Posted on May 17, 2011 at 12:48Hi there,
I am confused by the fact that I can't start the HSE. I have two projects that have identical initial code:
Code:
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS) {
// project 1 reaches here. Uses FW2.0.1.
}else{
// project 2 reaches here. Uses FW2.0.2.
}
One project has HSEStartUpStatus == SUCCESS and the other one does not.
These are running on the same STM3210-E Eval board. These are the very first executed lines in both programs. Since the code is identical, I suppose I should look for differences in the include files and in the IAR EWARM 5.20 project configurations. Any other ideas?
A clue may be that project 2 is being migrated from a medium density device project.
Both projects have
#define HSE_Value ((u32)8000000) /* Value of the External oscillator in Hz*/
in stm32f10x_conf.h.
Regarding RCC_HSEConfig, the Firmware manual states
''HSE can not be stopped if it is used directly or through the PLL as
system clock.''
but I don't see how I could be violating this if these are the first lines of code. I don't think the system clock is configured yet. But I am no expert on the clock tree.
Any ideas?
Thanks and regards,
Owen
