XCore Exchange

Code: Select all

# include <xs1.h>
# define BIT_RATE 115200
# define BIT_TIME XS1_TIMER_HZ / BIT_RATE
out port TXD = XS1_PORT_1H ;//D23 pin
int main ()
{

return 0;
}

 void txByte(out port TXD,int byte)
    {

        unsigned time;
        timer t;
        t:>time;
        TXD <: 0;
        time += BIT_TIME ;
        t when timerafter ( time ) :> void ;
        
        for ( int i =0; i <8; i ++)
        {
        TXD <: >> byte ;
        time += BIT_TIME ;
        t when timerafter ( time ) :> void ;
        }
        TXD <: 1;
        time += BIT_TIME ;
        t when timerafter ( time ) :> void ;
        }

Code: Select all

/*
 * Full_UART.xc
 *
 *  Created on: Feb 27, 2020
 *      Author: kumar (Mon2)
 *
 *     UART Receiver by Leon Heller
 *     https://www.xcore.com/viewtopic.php?f=21&t=5263
 *
 */


#include <xs1.h>
#define BIT_RATE 115200
#define BIT_TIME XS1_TIMER_HZ / BIT_RATE
out port TXD = XS1_PORT_1H ; //D23 pin
in port  RXD = XS1_PORT_1G ; //D22 pin


void txByte(unsigned int byte)
   {

       unsigned time;
       timer t;
       t:>time;
       TXD <: 0;
       time += BIT_TIME ;
       t when timerafter ( time ) :> void ;

       for ( int i =0; i <8; i ++)
       {
       TXD <: >> byte ;
       time += BIT_TIME ;
       t when timerafter ( time ) :> void ;
       }
       TXD <: 1;
       time += BIT_TIME ;
       t when timerafter ( time ) :> void ;
       }


unsigned char rxByte(void)
{
   unsigned data = 0, time;
   int i;
   unsigned char c;


   // wait for start bit
   RXD when pinseq (0) :> int _ @ time;
   time += BIT_TIME + (BIT_TIME >> 1);

   // sample each bit in the middle.
   for (i = 0; i < 8; i += 1)
   {
      RXD @ time :> >> data;
      time += BIT_TIME;
   }

   // reshuffle the data.
   c = (unsigned char) (data >> 24);

   return {c};
}


int main ()
{
unsigned int c;

while(1) // perm loop
{
txByte('\r');
txByte('\n');

for (c='a';c<'z';c++)
   txByte(c);
}

// receive a byte from outside world
c = rxByte();

// transmit the received byte over UART
txByte(c);

return 0;
}