//------------------------------------------------------------------------------------
// BlinkyF330.c   
//------------------------------------------------------------------------------------
//
// This program flashes the green LED
//
// Target: C8051F330
//
// Tool chain: SDCC 'c'
//
// Change Log:
//
// 2009-02-03   mk, none yet
//
//------------------------------------------------------------------------------------
// Includes
//------------------------------------------------------------------------------------

#include <C8051F330.h>                 // SFR declarations

//------------------------------------------------------------------------------------
// Global CONSTANTS
//------------------------------------------------------------------------------------
sbit at 0x93 LED;   // p1.3 F330 green LED: '1' = OFF; '0' = ON

//------------------------------------------------------------------------------------
// Function PROTOTYPES
//------------------------------------------------------------------------------------
char _sdcc_external_startup(void);
void OSCILLATOR_Init(void);
void PORT_Init_330(void);

//-----------------------------------------------------------------------------
// Global Variables
//-----------------------------------------------------------------------------
unsigned long mainCount = 0;

//------------------------------------------------------------------------------------
// MAIN Routine
//------------------------------------------------------------------------------------

void
delay_ms( unsigned long ms )
{
   unsigned long i;
   while ( ms-- ) {
      for ( i=0; i<250; i++ )
      {
          // jumbo mumbo  
      }
   }
}

void
main (void)
{

   //OSCILLATOR_Init ();     // Initialize system clock to 24.5 Mhz

   P1MDOUT   = 0x08;       // P1.3 is push-pull
   XBR1      = 0x40;       // Enable Crossbar; pull-ups enabled
   //PORT_Init_330();

   while (1) { // spin forever
      mainCount++;
      LED = !LED; // change state of LED
      delay_ms(500);
   }
}

//-----------------------------------------------------------------------------
// OSCILLATOR_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This function initializes the system clock to use the internal 24.5/8 MHz
// oscillator as its clock source.  Also enables missing clock detector reset.
//
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void)
{
   OSCICN = 0x80;    // Configure internal oscillator for lowest frequency
   RSTSRC = 0x04;    // Enable missing clock detector
}

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This function configures the crossbar and GPIO ports.
//
//
// P0.4   digital   push-pull     UART TX
// P0.5   digital   open-drain    UART RX
// P0.6   digital   open-drain    /INT0
// P1.3   digital   push-pull     LED (and CEX0 depending on Blink_State)
// P1.6   analog                  Potentiometer (ADC input)
//
//-----------------------------------------------------------------------------

void
PORT_Init_330 (void)
{
   P1MDIN    = 0xBF;                   // P1.6 is analog, rest of P1 digital
   P0MDOUT   = 0x10;                   // P0.4 is push-pull
   P1MDOUT   = 0x08;                   // P1.3 is push-pull

   P0SKIP    = 0xCF;                   // Skip all of P0 except for UART0 pins
   P1SKIP    = 0x47;                   // Skip P1.6 and push CEX0 to P1.3

   P0       |= 0x60;                   // Set port latch for pins RX and /INT0
                                       // to configure as inputs

   XBR0      = 0x01;                   // Enable UART
   XBR1      = 0x40;                   // Enable Crossbar; pull-ups enabled
}

//-----------------------------------------------------------------------------
// SDCC special - stop the Watchdog timer prior to initialization
//
// !!! to work properly this requires prototype define (see above)
//-----------------------------------------------------------------------------
char _sdcc_external_startup(void)
{
   // disable watchdog on F020
   //VDM0CN = 0xde;
   //VDM0CN = 0xad;

   // disable watchdog on F330
   PCA0MD &= ~0x40;           // WDTE = 0 (clear watchdog timer enable)

   return 0; // do not skip variable initialization
}