| | 1 | /* |
| | 2 | */ |
| | 3 | |
| | 4 | #include "common.h" |
| | 5 | #include <avr/interrupt.h> |
| | 6 | #include <util/atomic.h> |
| | 7 | #include "timer.h" |
| | 8 | |
| | 9 | /* timer interrupt/overflow counter */ |
| | 10 | /* counts up every ms. */ |
| | 11 | static volatile |
| | 12 | uint32_t timestamp; |
| | 13 | |
| | 14 | /*---------------------------------------------------------*/ |
| | 15 | /* 1000Hz timer interrupt generated by OC3A */ |
| | 16 | /*---------------------------------------------------------*/ |
| | 17 | |
| | 18 | ISR(TIMER3_COMPA_vect) |
| | 19 | { |
| | 20 | static int_fast8_t tick_10ms; |
| | 21 | int_fast8_t i; |
| | 22 | |
| | 23 | extern void disk_timerproc(void); |
| | 24 | |
| | 25 | timestamp++; |
| | 26 | |
| | 27 | i = tick_10ms + 1; |
| | 28 | if (i == 10) { |
| | 29 | i = 0; |
| | 30 | Stat |= S_10MS_TO; |
| | 31 | |
| | 32 | /* Drive timer procedure of low level disk I/O module */ |
| | 33 | disk_timerproc(); |
| | 34 | } |
| | 35 | tick_10ms = i; |
| | 36 | } |
| | 37 | |
| | 38 | |
| | 39 | /*--------------------------------------------------------------------------*/ |
| | 40 | |
| | 41 | #if 0 |
| | 42 | void timer_setup(void) |
| | 43 | { |
| | 44 | |
| | 45 | /* Clock */ |
| | 46 | CLKPR = _BV(CLKPCE); |
| | 47 | CLKPR = 0; |
| | 48 | |
| | 49 | /* Timer */ |
| | 50 | |
| | 51 | OCR1A = F_CPU / 1000 - 1; // Timer1: 1000Hz interval (OC1A) |
| | 52 | TCCR1B = 0b00001001; |
| | 53 | TIMSK1 = _BV(OCIE1A); // Enable TC1.oca interrupt |
| | 54 | } |
| | 55 | #endif |
| | 56 | |
| | 57 | /*--------------------------------------------------------------------------*/ |
| | 58 | |
| | 59 | uint32_t get_timer(uint32_t base) |
| | 60 | { |
| | 61 | uint32_t ret; |
| | 62 | ATOMIC_BLOCK(ATOMIC_FORCEON) |
| | 63 | { |
| | 64 | ret = timestamp; |
| | 65 | } |
| | 66 | return ret - base; |
| | 67 | } |
projects / z180-stamp.git / blame_incremental