EX_SRAM.C
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/////////////////////////////////////////////////////////////////////////
//// EX_SRAM.C ////
//// ////
//// This program uses the PCF8570.C SRAM driver to read and write ////
//// to an external (2 wire) serial SRAM. ////
//// ////
//// Configure the CCS prototype card as follows: ////
//// Insert jumpers from: ////
//// PCF8570 Protoboard ////
//// 1 27 gnd ////
//// 2 27 gnd ////
//// 3 27 gnd ////
//// 4 27 gnd ////
//// 5 54 B7 ////
//// 6 53 B6 ////
//// 7 27 gnd ////
//// 8 28 +5V ////
//// See additional connections below. ////
//// ////
//// The 68HC68R1.C or 68HC68R2.C drivers may be used in place of ////
//// the PCF8570.C driver. ////
//// This example will work with the PCB, PCM and PCH compilers. ////
//// The following conditional compilation lines are used to ////
//// include a valid device for each compiler. Change the device, ////
//// clock and RS232 pins for your hardware if needed. ////
/////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2001 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
/////////////////////////////////////////////////////////////////////////
#if defined(__PCB__)
#include <16c56.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2) // Jumpers: 11 to 17, 12 to 18
#elif defined(__PCM__)
#include <16c74.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#elif defined(__PCH__)
#include <18c452.h>
#fuses HS,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#endif
#include
#include
main() {
byte value,cmd;
byte address;
do {
do {
printf("\r\nRead or Write: ");
cmd=getc();
cmd=toupper(cmd);
putc(cmd);
} while ( (cmd!='R') && (cmd!='W') );
printf("\n\rLocation: ");
address = gethex();
if(cmd=='R')
printf("\r\nValue: %X\r\n",READ_EXT_SRAM( address ) );
if(cmd=='W') {
printf("\r\nNew value: ");
value = gethex();
printf("\n\r");
WRITE_EXT_SRAM( address, value );
}
} while (TRUE);
}
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