Keil C51 Cross Compiler - gmitWEB

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Accessing Individual Port Pins • Writing to a port pin //write a logic 1 to port 0 pin 1 P0^1 = 1; • In a program using lots of individual port pins it is better coding practice to name the pins according to their function sbit power_led = P0^1; power_led = 1; • Reading from a port pin //Turn on LED if switch is active sbit switch_input = P2^0; if (switch_input) else power_led = 1; power_led = 0; Embedded Systems 2 2 - 22 C Programming
Example Code (4) //program to flash an LED connected to Port 2 pin 0 every 0.2 seconds #include sbit LED = P2^0; void delay(); void main() { } while (1) { } LED = 0; delay(); LED = 1; delay(); //LED off //LED on //Delay function void delay() { ……. } Embedded Systems 2 2 - 23 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 and 14: Wait Loops • In some applications
Page 15 and 16: C Bitwise Operators • NOT ~ char
Page 17 and 18: C Logical Operators • Bitwise ope
Page 19 and 20: Accessing Port Pins • Writing to
Page 21: Example Code (3) //Program to read
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 -

Keil C51 Cross Compiler - gmitWEB

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