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COMPILADOR C DE CCS PRINCIPALES FUNCIONES Y DIRECTIVAS DIRECTIVAS DE PREPROCESADO #DEVICE Syntax: #device chip options – chip is the name of a specific processor (like: PIC16C74), – Options are qualifiers to the standard operation of the device. Example: – #device PIC16F877 #INCLUDE Syntax: – #include <filename> – #include "filename“ Ejemplos: – #include <16f877.h> – #include “lcd.h” #DEFINE Syntax: #define id text Used to provide a simple string replacement of the ID with the given text from this point of the program and on. Examples: – #define verdadero 1 – #define falso 0 #USE ****_I/O Afectan a como utilizamos los TRISX Syntax: – #use fast_io (port) – #use fixed_io (port_outputs=pin, pin?) – #USE STANDARD_IO (port) Ejemplo – #use fast_io (A) #USE DELAY Syntax: #use delay (clock=speed(Hz)) Tells the compiler the speed of the processor and enables the use of the built-in functions: delay_ms() and delay_us(). Ejemplo: – #use delay (clock=20000000) #BYTE Syntax: #byte id = x Elements: id is a valid C identifier, x is a C variable or a constant Coloca la variable id en la posicion de memoria x. Ejemplo: – #byte portb=5 #INT_xxx Indica que la funcion a continuacion es la rutina de atencion de una determinada interrupción #INT_EXT External interrupt #INT_RTCC Timer 0 (RTCC) overflow #INT_TIMER1 Timer 1 overflow FUNCIONES ESPECIFICAS DEL COMPILADOR RS232 I/O I2C I/O Discrete I/O SPI two wire I/O Parallel Slave I/O Delays Processor Controls Bit/Byte Capt/Comp/PWM Timers A/D Conversion EEPROM C Math Etc. DELAYS delay_ms(tiempo) delay_us(tiempo) delay_cycles(ciclos) (0-255) – 1 ciclo= 4 ciclos de reloj INPUT( ) Syntax: value = input (pin) Returns: – 0 (or FALSE) if the pin is low, – 1 (or TRUE) if the pin is high Ejemplo: – Encendido=input(PIN_A4) INPUT_x() Syntax: – value = input_a() – value = input_b() – value = input_c() – ... Returns: An 8 bit int representing the port input data. OUTPUT_X() Syntax: – output_a (value) – output_b (value) – ... Parameters: value is an 8 bit int Function: Output an entire byte to a port. OUTPUT_BIT( ) Syntax: output_bit (pin, value) Function: Outputs the specified value (0 or 1) to the specified I/O pin. Ejemplos – Output_bit (PIN_D1,0) – Output_bit(PIN_A3,1) OUTPUT_xxxx() OUTPUT_HIGH( ) – Syntax: output_high (pin) – Function: Sets a given pin to the high state. OUTPUT_LOW( ) – Syntax: output_low (pin) – Function: Sets a given pin to the ground state. SET_TRIS_X() Configura los registros de direccionamiento de los puertos (TRIS) 0 significa salida 1 significa entrada Ejemplo: – Set_tris_a(0b00001011) ENABLE/DISABLE INTERRUPTS Permiten o inhiben las interrupciones. Ejemplos: – enable_interrupts(GLOBAL); – disable_interrupts(INT_TIMER0); – enable_interrupts(INT_TIMER1); OTRAS FUNCIONES setup_adc_ports() setup_adc() set_adc_channel() read_adc() setup_timer_X() set_timer_X() get_timer_X() swap() setup_ccpX() set_pwmX_duty()