I was wondering if someone could help me with this problem I'm having with the f340.

I compile and run the blinky code with KEIL and it runs fine.

I am aware that I need to use the following to disable the watchdog timer:

unsigned char _sdcc_external_startup ( void )
{
//PCA0MD= 0x00;
PCA0MD &= ~0x40; // Disable Watchdog timer temporarily
return 0;
}

But every time I check, PCA0MD remains 0x40 and RSTSRC=0x08, which means that the watchdog is still resetting the micro.

Tsuneo

#include "C8051F340.h"

// Peripheral specific initialization functions,
// Called from the Init_Device() function
void PCA_Init()
{
PCA0MD &= ~0x40;
PCA0MD = 0x00;
}

// Initialization function for device,
// Call Init_Device() from your main program
void Init_Device(void)
{
PCA_Init();
}

char _sdcc_external_startup()
{
PCA0MD &= ~0x40; // Disable Watchdog timer temporarily
Init_Device();
return 0;
}

With quotes your including the header file from the current directory which might be for Keil only. With < > you should get the one from the SDCC distribution.

But there's more. The latest IDE adds an extra search path to its own include directory and then even with < > SDCC might still use the Keil version.

The problem with the Keil format for sfr definitions is that it reuses C syntax for assignment for setting the address of the sfr. SDCC happily accepts this assignment to the newly defined sfr variable which has no particular address and gets a random address from the linker.