/* ********************************************************************** * File S1deb4.C - Rel. 1.1 compile with uC/51 V. 1.10.7 * * GRIFO(R) via Dell'Artigiano 8/6 40016 S. Giorgio di Piano (BO) * * Cards: GPC 323/D d.s. 250601 and DEB01 or TIO16 * * Tel. +39 051 892052 Fax. +39 051 893661 * * http://www.grifo.com http://www.grifo.it * * sales@grifo.it tech@grifo.it grifo@grifo.it * * by Graziano Gaiba del 17.07.03 * ********************************************************************** Rel. 1.1 - 17.07.2003 by Graziano Gaiba Connect CN7 of GPC(r) 323 to CN15 of DEB01 or CN1 of TIO16 through a 20 pins flat. This program shows the status of Dip Switch DSW1 on port A. */ #include #include #include // Clock frequency of CPU used #define FCLOCK 22118400 // On board peripherals registers allocation addresses. static unsigned char PORTA @ 0xFFFC, PORTB @ 0xFFFD, PORTC @ 0xFFFE, CNT @ 0xFFFF, DSW1 @ 0xFFF9; /********* General purpose utilities and hw sections management ***********/ void iniser(unsigned long baud) /* Initialise serial port with: Bit x chr = 8 Stop bit = 1 Parity = None Baud rate = baud using timer 1 as baud rate generator. */ { SCON=0x052; // Modo 1, receiver enabled TMOD&=0x00F; // Timer 1 in auto-reload mode TMOD|=0x020; TR1=0; // Stop TIMER 1 TH1=256-((2*FCLOCK)/(384*baud)); // baud at 14.7456 MHz PCON=PCON|0x080; // Set SMOD=1 for higher baud rate TR1=1; // Start TIMER 1 } // Wait for signals settling void setup(void) { unsigned int i; for(i=10000; i!=0; i--) ; } // Initialise 82c55 with value in parameter void init8255(unsigned char c) { CNT=c; } // Set port A of 82c55 void setPortA(unsigned char v) { PORTA=v; } // Set port B of 82c55 void setPortB(unsigned char v) { PORTB=v; } // Set port C of 82c55 void setPortC(unsigned char v) { PORTC=v; } // Get port A of 82c55 unsigned char getPortA(void) { return PORTA; } // Get port B of 82c55 unsigned char getPortB(void) { return PORTB; } // Get port C of 82c55 unsigned char getPortC(void) { return PORTC; } // Get value of DSW1 unsigned char getDSW1(void) { return DSW1; } // Delay to prevent serial line overrun void ritardo(void) { unsigned int i; for(i=0xffff; i!=0; i--) ; } // **************************** Main program ***************************** void main(void) { setup(); // Wait for signals settling iniser(19200); TI=0; RI=0; // Comment next two lines if serial port is used in polling (SIOTYPE=p or k) ES=1; // Enable serial port interrupt EA=1; // Enable all interrupts // Initialisation of PPI 8255. init8255(0x82); // PORT A and C in OUTPUT, PORT B in INPUT. puts("********************* Demo S1DEB4 **********************"); puts(""); puts("Shows continuously status of Dip Switch DSW1 on PORT A."); setPortC(0xff); // Clear Port C for (;;) // Loop forever. { setPortA(getDSW1()); } }