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#include "hw.h"
#if defined __SDCC || defined SDCC
#elif defined __C51__
#else /* IAR4 */
#include <stdio.h>
#endif
#include "serial.h"
extern __xdata char *simif;
volatile unsigned char serial_buffer[SERIAL_BUFFER_SIZE];
volatile unsigned char first_occupied, first_free;
volatile bit serial_sent;
unsigned char
serial_nuof_received()
{
if (first_free == first_occupied)
return 0;
else if (first_free > first_occupied)
return first_free - first_occupied;
else
return SERIAL_BUFFER_SIZE - (first_occupied - first_free);
}
/* Serial line ISR puts received chars into a ring buffer */
#if defined __SDCC || defined SDCC
void serial_isr(void) __interrupt (4)
#elif defined __C51__
void serial_isr(void) interrupt 4
#else /* IAR4 */
interrupt void SCON_int(void)
#endif
{
if (RI)
{
unsigned char c;
unsigned char new, nr;
c= SBUF;
new= first_free+1;
new= new % SERIAL_BUFFER_SIZE;
*simif= 'p';*simif= '|';
*simif= 'p';*simif= c;
*simif= 'p';*simif= '|';
if (new != first_occupied)
{
serial_buffer[first_free]= c;
first_free= new;
}
else
{
*simif= 'p';*simif= '*';
*simif= 'p';*simif= c;
*simif= 'p';*simif= '*';
P1++;
}
nr= serial_nuof_received();
*simif= 'p';*simif= '/';
*simif= 'p';*simif= nr+'0';
*simif= 'p';*simif= '/';
RI= 0;
P0= first_free<<4 + first_occupied;
}
else if (TI)
{
serial_sent= 1;
TI= 0;
}
}
#if defined __SDCC || defined SDCC
static __sfr __at(0x97) s97;
#elif defined __C51__
static sfr s97= 0x97;
#endif
/* Initialization of serial line */
void
serial_init(long int br)
{
/* Set variables */
first_free= first_occupied= 0;
if (!(serial_sent= 1))
serial_dummy();
/* Set USART mode: 8 bit variable speed */
SCON= 0x40;
ES= 1;
REN= 1;
s97= 0xf0;
s97= 0x55;
if (s97 == 0x55)
{
beallitas();
return;
}
/* Set Timer2 as baudrate generator, XTAL=11.0592MHz */
C_T2= 0;
CP_RL2= 0;
{
long int l= (3*115200)/br;
TL2= RCAP2L= (65536-l)&0xff; /* 3=115200,6=57600,9=38400,18=19200,36=9600 */
TH2= RCAP2H= (65536-l)/256;
}
RCLK= 1;
TCLK= 1;
TR2= 1;
/* Start */
EA= 1; /* Enable interrupts */
}
void
beallitas(void)
{
/* Valtozok beallitasa */
if (first_occupied= 0)
;/*serial_dummy();*/
first_free= 0;
serial_sent= 1;
/* Timer1 beallitasa 9600 baud-os sebesseg generalasahoz */
TMOD= (TMOD & 0x0f) | 0x20;
TH1= 0xfd;
TL1= 0xfd;
PCON&= 0x7f; /* SMOD=0 */
ET1= 0;
/* Soros vonal beallitasa, 8 bites valtoztathato sebessegu mod */
SCON= 0x40;
ES= 1;
REN= 1;
/* Start */
TR1= 1; /* Idozito indul */
EA= 1; /* Megszakitasok engedelyezese */
}
/************************************************** Low level line handling */
/* Blocking send */
unsigned char
serial_send(unsigned char c)
{
while (!serial_sent) ;
SBUF= c;
serial_sent= 0;
return c;
}
void
putchar(char c)
{
serial_send(c);
}
/* Check for recived chars */
unsigned char
serial_received(void)
{
return first_free != first_occupied;
}
/* Blocking receive */
unsigned char
serial_receive(void)
{
unsigned char c, nr;
while (!serial_received()) ;
ES= 0;
c= serial_buffer[first_occupied++];
first_occupied%= SERIAL_BUFFER_SIZE;
nr= serial_nuof_received();
*simif= 'p';*simif= '@';
*simif= 'p';*simif= nr+'0';
*simif= 'p';*simif= '@';
ES= 1;
return c;
}
char
getchar(void)
{
return serial_send(serial_receive());
}
void
serial_dummy(void)
{
serial_init(0);
beallitas();
serial_send(0);
serial_received();
putchar(0);
getchar();
}
/* End of serial.c */
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