71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
#ifndef TIMER_H
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#define TIMER_H
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#include <stdint.h>
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namespace Timer {
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/* Timer peripheral (with common registers) */
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uint32_t* const TMR_PERIPHERAL_BASE = (uint32_t*)(0x01c20c00);
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struct Peripheral {
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uint32_t TMR_IRQ_EN_REG;
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uint32_t TMR_IRQ_STA_REG;
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};
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/* Timer modules array */
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uint32_t* const TMR_MODULE_BASE = (uint32_t*)(0x01c20c10);
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struct TimerModule {
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uint32_t TMR_CTLR_REG;
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uint32_t TMR_INTV_VALUE_REG;
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uint32_t TMR_CUR_VALUE_REG;
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};
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enum Mode {
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CONTINUOUS = 0,
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SINGLE = 1
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};
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enum Prescaler { /* maybe PRESCALERx = log2(x) */
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PRESCALER_1 = 0,
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PRESCALER_2 = 1,
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PRESCALER_4 = 2,
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PRESCALER_8 = 3,
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PRESCALER_16 = 4,
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PRESCALER_32 = 5,
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PRESCALER_64 = 6,
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PRESCALER_128 = 7
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};
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enum ClockSource {
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LS_OSC = 0, /* Low speed OSC */
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OSC24M = 1, /* OSC24M */
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PLL66 = 2 /* PLL6/6 */
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};
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Peripheral* const peripheral = (Peripheral* const)(TMR_PERIPHERAL_BASE);
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class Timer {
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private:
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uint8_t n; /* Timer module number (0-5) */
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uint16_t src; /* Timer interrupt source line (54-57, 99-100) */
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TimerModule* module; /* Timer module MMIO config registers */
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public:
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/* Initialize class instance as timer n
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* where n is found on Allwinner datasheet */
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Timer(uint8_t n);
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/* Prepare timer */
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void set(uint32_t interval, Mode mode, Prescaler prescaler, ClockSource source);
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/* Reload and start timer */
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void start(void);
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/* Stop timer */
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void stop(void);
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};
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/* Interrupt handler */
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extern void handler(const uint8_t cpuID, const uint16_t interruptID);
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/* Vector of system's timers */
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extern Timer timer[];
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}
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#endif
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