Posted on October 01, 2007 at 08:36/***********************************************************************/
Hello Sagai,
This is an example:
----------------------
/* */
/* SERIAL2 */
// Initialize the Asynchronous Serial Communication interface ASC0 to
// transmit a string at 9600 Baud, 8 Data and 1 Stopbit no Parity
//
// Use an interrupt to load the ASC0 Transmit Buffer Register
// Use your system terminal program to display the message.
/***********************************************************************/
#include
/********************************************************************/
sfrbit DP20 _atbit(DP2,0);
sfrbit DP21 _atbit(DP2,1);
sfrbit DP22 _atbit(DP2,2);
sfrbit DP23 _atbit(DP2,3);
sfrbit DP310 _atbit(DP3,10);
sfrbit P310 _atbit(P3,10);
/********************************************************************/
void init_sci_ch0( void );
void delay( void );
/********************************************************************/
#pragma global
static volatile char msg[] =
{
''Hello World, this is ST10F276 but soon it will be ST10F29x''
};
/********************************************************************/
void init_sci_ch0( void )
{
/* Port P3.10 = Serial Output, the TX pin */
/* first set port, before changing the direction (avoid glitch) */
_putbit (1, P3, 10);
DP310 = 0x01;
/* Asynchron mode, transmission only, no Error Checks */
S0CON = 0x0001;
/* 9600 baud the CPU clock frequency is 40MHz */
S0BG = 0x81;
/* Transmit Interrupt, ILVL=8, GLVL=0 */
S0TIC = 0x60;
/* Baud Rate Generator Start */
S0R = 1;
}
/********************************************************************/
// Serial transmit interrupt service routine
interrupt( 0x2A ) void s0_tx_int( void )
{
static volatile char *cptr;
static volatile char n=0;
static volatile char m=0;
if( n==0 )
cptr = msg;
m = *cptr;
if( m != '\0' )
{
S0TBUF = m;
cptr++;
}
else
{
n = 0;
return;
}
n++;
/* LEDs Games */
if(P2++ > 4)
{
delay();
P2 = 4;
}
}
/********************************************************************/
void delay( void )
{
volatile unsigned int t1, t2, t3=0;
for( t1= 15000; t1 > 0; t1-- )
{
for( t2=0xffff; t2>0; t2++ )
t3++;
}
}
/********************************************************************/
main()
{
volatile unsigned int p=0;
/* P2.0 - 2.3 = output */
DP20 = DP21 = DP22 = DP23 = 0x01;
/* LEDs = OFF */
P2 = 0xFF;
delay();
// init ASC0
init_sci_ch0();
/* Global Interrupt Enable */
IEN = 1;
/* Trigger Serial Transmission */
S0TIR = 1;
while( 1 )
{
/* LEDs Games */
if(P2++ > 4)
{
delay();
P2 = 1;
}
delay();
/* Repeat Transmission after delay */
if( p++ > 50 )
{
S0TIR=01;
p=0;
}
}
}
/********************************************************************/
Regards,
Najoua.
