Posted on May 17, 2011 at 12:21I have written a small program (below) to demonstrate a GPIO register not resetting to the expected value when running with Jlink / IAR EWARM.
Does anyone know if there's any way to change the behaviour of the Jlink device to ensure all registers are at their documented reset states after a reset (while debugging)?
Or maybe it's my setup...Can anyone else see this issue?
(I'm using IAR Kickstart 4.42A with Jlink Version 6)
Cheers
#define GPIOA_CRL (*((volatile unsigned int *)0x40010800))
/*******************************************************************************
* Main program - Showing a GPIOA register not being reset correctly
* Dev tools used:
* - IAR Embedded Workbench (Kickstart Version 4.42A)
* - Jlink debugger Version6
* ST Documentation shows GPIOx_CRL should be 0x44444444 out of reset
* Program below shows the GPIOA_CRL is never set to expected value during
* debugging
*******************************************************************************/
int main(void)
{
if (GPIOA_CRL == 0x44444444) // This is the (expected) reset value
{
// STM32 register was reset properly - now change it
GPIOA_CRL = 0x88888888; // Set GPIOA to Input with Pullup/down
}
else // Register not reset correctly
{
// STM32 register NOT reset correctly!
// Change the register to
GPIOA_CRL = 0x44444444; // Setup for floating Inputs
}
while(1);
}
[ This message was edited by: edware on 14-01-2008 06:15 ]
