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// Writer: Moti Litochevski
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// Writer: Moti Litochevski
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//
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//
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// Description:
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// Description:
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// This file contains a simple program written in Small-C that sends a string to
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// This file contains a simple program written in Small-C that sends a string to
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// the UART and then switches to echo received bytes.
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// the UART and then switches to echo received bytes.
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// This example also include a simple interrupt example which will work with the
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// verilog testbench. the testbench
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//
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//
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// Revision History:
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// Revision History:
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//
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//
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// Rev <revnumber> <Date> <owner>
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// Rev <revnumber> <Date> <owner>
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// <comment>
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// <comment>
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//---------------------------------------------------------------------------------------
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//---------------------------------------------------------------------------------------
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// define interrupt vectors
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// note that this file must be edited to enable interrupt used
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#include intr_vec.h
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// insert c80 assmbly library to the output file
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#include ..\tools\c80\c80.lib
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#include ..\tools\c80\c80.lib
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// UART IO registers
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// UART IO registers
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port (128) UDATA; // uart data register used for both transmit and receive
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port (128) UDATA; // uart data register used for both transmit and receive
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port (129) UBAUDL; // low byte of baud rate register
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port (129) UBAUDL; // low byte of baud rate register
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port (130) UBAUDH; // low byte of baud rate register
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port (130) UBAUDH; // low byte of baud rate register
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port (131) USTAT; // uart status register
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port (131) USTAT; // uart status register
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// digital IO ports registers
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// digital IO ports registers
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port (132) P1REG; // output port1 - used as first attenuator control
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port (132) P1DATA; // port 1 data register
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port (133) P2REG; // output port2 - used as low digit LCD
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port (133) P1DIR; // port 1 direction register control
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port (134) P3REG; // output port3 - used as high digit LCD
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port (134) P2DATA; // port 2 data register
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port (135) P4REG; // output port4
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port (135) P2DIR; // port 2 direction register control
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// interrupt controller register
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port (136) INTRENA; // interrupts enable register
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// simulation end register
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// simulation end register
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// writing any value to this port will end the verilog simulation when using tb_l80soc
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// writing any value to this port will end the verilog simulation when using tb_l80soc
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// test bench.
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// test bench.
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port (255) SIMEND;
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port (255) SIMEND;
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sendbyte('A'+q-10);
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sendbyte('A'+q-10);
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else
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else
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sendbyte('0'+q);
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sendbyte('0'+q);
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}
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}
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// external interrupt 0 service routine
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int0_isr()
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{
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printstr("Interrupt 0 was asserted."); nl();
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}
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// program main routine
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// program main routine
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main()
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main()
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{
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{
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// configure UART baud rate - set to 9600 for 30MHz clock
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// configure UART baud rate - set to 9600 for 30MHz clock
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// BAUD = round(<clock>/<baud rate>/16) = round(30e6/9600/16) = 195
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// BAUD = round(<clock>/<baud rate>/16) = round(30e6/9600/16) = 195
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UBAUDL = 195;
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//MOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTI
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//MOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTI
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// UBAUDL = 195;
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UBAUDL = 1;
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//MOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTI
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//MOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTIMOTI
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UBAUDH = 0;
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UBAUDH = 0;
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// configure both ports to output and digital outputs as zeros
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P1DATA = 0x00;
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P1DIR = 0xff;
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P2DATA = 0x00;
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P2DIR = 0xff;
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// enable interrupt 0 only
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INTRENA = 0x01;
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// enable CPU interrupt
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#asm
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ei
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#endasm
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// print message
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// print message
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printstr("Hello World!!!"); nl();
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printstr("Hello World!!!"); nl();
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printstr("Dec value: "); printdec(tstary[1]); nl();
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printstr("Dec value: "); printdec(tstary[1]); nl();
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printstr("Hex value: 0x"); printhex(tstary[0]); nl();
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printstr("Hex value: 0x"); printhex(tstary[0]); nl();
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printstr("Echoing received bytes: "); nl();
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// assert bit 0 of port 1 to test external interrupt 0
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P1DATA = 0x01;
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printstr("Echoing received bytes: "); nl();
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// loop forever
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// loop forever
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while (1) {
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while (1) {
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// check if a new byte was received
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// check if a new byte was received
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if (getbyte())
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if (getbyte())
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// echo the received byte to the UART
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// echo the received byte to the UART
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sendbyte(rxbyte);
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sendbyte(rxbyte);
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}
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}
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}
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}
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//---------------------------------------------------------------------------------------
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//---------------------------------------------------------------------------------------
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// Th.. Th.. Th.. Thats all folks !!!
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// Th.. Th.. Th.. Thats all folks !!!
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//---------------------------------------------------------------------------------------
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//---------------------------------------------------------------------------------------
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No newline at end of file
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No newline at end of file
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