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IT IS THE USER' S RESPONSIBILITY TO VERIFY THE USER SOFTWARE DESIGN FOR CONSISTENCY AND FUNCTIONALITY THROUGH THE USE OF FORMAL SOFTWARE VALIDATION METHODS. ------------------------------------------------------------------ ================================================================== */ #include "timer.h" #include "pic.h" #include "reg_access.h" //struct interrupt_entry intTimer; extern struct interrupt_entry int_table[S_INT_NUM]; static void timer_isr(void *context) { struct timer_instance *ctx = (struct timer_instance *) context; if (ctx->callback) { ctx->callback(ctx->userCtx); } if (ctx->periodic) { timer_reload(ctx, ctx->delay); } } unsigned char timer_init(struct timer_instance *this_timer, unsigned int base_addr, unsigned int cpu_freq) { unsigned long long int tmp = 1; if (NULL == this_timer) { return 1; } this_timer->base_address = base_addr; this_timer->cpu_freq = cpu_freq; timer_set_mtime(this_timer, tmp); return 0; } unsigned char timer_start(struct timer_instance *this_timer, void (*callback) (void *), void *userCtx, unsigned int periodic, unsigned int count) { unsigned int val; /* Check initial condition */ unsigned int mie; if (NULL == this_timer) { return 1; } this_timer->periodic = periodic; this_timer->callback = callback; this_timer->userCtx = userCtx; int_table[0].isr = timer_isr; int_table[0].context = this_timer; this_timer->delay = count; timer_reload(this_timer, count); /* Enable interrupt */ //__asm__ __volatile__("csrsi mie, 8"); __asm__ __volatile__("csrr %0, mie":"=r"(mie)); mie = mie | 0x80; __asm__ __volatile__("csrw mie, %0"::"r"(mie)); return 0; } unsigned char timer_stop() { unsigned int mie; int_table[0].isr = NULL; int_table[0].context = NULL; __asm__ __volatile__("csrr %0, mie":"=r"(mie)); mie = mie & 0xff7f; __asm__ __volatile__("csrw mie, %0"::"r"(mie)); return 0; } unsigned char timer_get_mtime(struct timer_instance *this_timer, unsigned long long int *value) { unsigned int mtime_lo; unsigned int mtime_hi; if (NULL == this_timer) { return 1; } reg_32b_read(this_timer->base_address | TIMER_MTIME_LOW, &mtime_lo); reg_32b_read(this_timer->base_address | TIMER_MTIME_HIGH, &mtime_hi); *value = ((unsigned long long int) mtime_hi << 32) | mtime_lo; return 0; } unsigned char timer_set_mtime(struct timer_instance *this_timer, unsigned long long int value) { unsigned int mtime_lo; unsigned int mtime_hi; if (NULL == this_timer) { return 1; } mtime_hi = (value >> 32) & 0xffffffff; mtime_lo = value & 0xffffffff; reg_32b_write(this_timer->base_address | TIMER_MTIME_LOW, mtime_lo); reg_32b_write(this_timer->base_address | TIMER_MTIME_HIGH, mtime_hi); return 0; } unsigned char timer_get_mtimecmp(struct timer_instance *this_timer, unsigned long long int *value) { unsigned int mtimecmp_lo; unsigned int mtimecmp_hi; if (NULL == this_timer) { return 1; } reg_32b_read(this_timer->base_address | TIMER_MTIMECMP_LOW, &mtimecmp_lo); reg_32b_read(this_timer->base_address | TIMER_MTIMECMP_HIGH, &mtimecmp_hi); *value = ((unsigned long long int) mtimecmp_hi << 32) | mtimecmp_lo; return 0; } unsigned char timer_set_mtimecmp(struct timer_instance *this_timer, unsigned long long int value) { unsigned int mtimecmp_lo; unsigned int mtimecmp_hi; if (NULL == this_timer) { return 1; } mtimecmp_hi = (value >> 32) & 0xffffffff; mtimecmp_lo = value & 0xffffffff; reg_32b_write(this_timer->base_address | TIMER_MTIMECMP_LOW, mtimecmp_lo); reg_32b_write(this_timer->base_address | TIMER_MTIMECMP_HIGH, mtimecmp_hi); return 0; } unsigned char timer_reload(struct timer_instance *this_timer, unsigned int delay) { unsigned long long int tmp; if (NULL == this_timer) { return 1; } timer_get_mtimecmp(this_timer, &tmp); // 1ms * delay tmp += (this_timer->cpu_freq / 1000) * delay; timer_set_mtimecmp(this_timer, tmp); return 0; }