Keil C51 Cross Compiler - gmitWEB

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Continuous Loops • An embedded program never ends – It must contain a main loop than loops continuously – e.g. a washing machine program continually tests the switch inputs • A continuous loop is programmed using a loop with no condition – while(1){ } – while(1); – for(;;){ } – for(;;); Embedded Systems 2 2 - 14 C Programming
C Bitwise Operators • NOT ~ char data x = 0x05; x = ~x; //x=0xFA • AND & char data x = 0x45; x &= 0x0F; //x = 0x05 – Useful for clearing specific bits within a variable (masking) • OR | char data x = 0x40; x |= 0x01; //x = 0x41 – Useful for setting individual bits within a variable • EXCLUSIVE OR ^ char data x = 0x45; x ^= 0x0F; //x = 0x4A – Useful for inverting individual bits within a variable Embedded Systems 2 2 - 15 C Programming
Page 1 and 2: Keil C51 Cross Compiler • ANSI C
Page 3 and 4: C51 Keywords Embedded Systems 2 2 -
Page 5 and 6: C51 Memory Models • Small - All v
Page 7 and 8: C51 Memory Types • Memory type ex
Page 9 and 10: C51 Memory Types • bdata - Bit ad
Page 11 and 12: Example Code (1) sbit input = P1^0;
Page 13: Wait Loops • In some applications
Page 17 and 18: C Logical Operators • Bitwise ope
Page 19 and 20: Accessing Port Pins • Writing to
Page 21 and 22: Example Code (3) //Program to read
Page 23 and 24: Example Code (4) //program to flash
Page 25 and 26: Software Delay • Use a for loop -
Page 27 and 28: Hardware Delay • Use timer 0 or t
Page 29 and 30: Re-entrant Functions • A re-entra
Page 31 and 32: Function Parameter Passing • Up t
Page 33 and 34: Interrupt Functions • Interrupt v
Page 35: C51 Pointers • Generic pointers -

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