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[/] [light52/] [trunk/] [test/] [common/] [soc.h] - Rev 20
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/** @file soc.h @brief Hardware-dependent function library. This file encapsulates hardware access from the rest of the program for easier porting. */ #ifndef SOC_H_INCLUDED #define SOC_H_INCLUDED #include <stdint.h> #include <stdbool.h> /*-- SoC configuration macros ------------------------------------------------*/ /* These may optionally be set at the makefile */ #ifndef CLOCK_RATE /** Default clock rate is that of Terasic's DE-1 board */ #define CLOCK_RATE (50e6) #endif #ifndef TIMER0_PRESCALER /** By default the prescaler is set to count periods of 20us @ 50MHz */ #define TIMER0_PRESCALER (1000) #endif /*-- Public functions --------------------------------------------------------*/ /*-- SoC ----------------------------------------------------------*/ /** Set up all the MCU peripherals with a standard cofiguration. This includes: -# Timer 0 set to count seconds (when prescaler set to 20us). -# UART in default configuration (19200-8-N-1). */ extern void soc_init(void); /** Read millisecond counter. @return Number of milliseconds elapsed since last call to mcu_init. */ extern uint32_t soc_get_msecs(void); /*-- CPU ----------------------------------------------------------*/ /** Enable or disable interrupts globally with EA flag. Does not affect any other interrupt flag. @arg enable 1 to enable interrupts, 0 to disable. */ extern void cpu_enable_interrupts(uint8_t enable); /*-- Timer 0 ------------------------------------------------------*/ /** Initialize Timer 0. This function does not start the timer, only: -# Loads the T0ARL flag. -# Clears the T0IRQ flag. -# Loads the reload register. @arg reload Value for reload register, or 0xffff to not use reload mode. */ extern void timer0_init(uint16_t reload); /** Start or stop Timer 0 by setting flag T0CEN. @arg enable 1 to start the timer, 0 to stop it. */ extern void timer0_enable(uint8_t enable); /** Read value of Timer 0 counter register. Will make sure the value read is consistent. @return Value of Timer 0 counter register. */ extern uint16_t timer0_counter(void); /** Enable or disable Timer 0 interrupt. Does not affect global EA flag. @arg enable 1 to enable interrupt, 0 to disable. */ extern void timer0_enable_irq(uint8_t enable); /*-- Interrupt function prototypes --------------------------------*/ /* NOTE: SDCC requires that the prototype of all irq functions be present in the file that contains the main function. */ /** Interrupt response function for IRQ1 (Timer 0). */ void timer0_isr(void) __interrupt(1); #endif
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