| 0,0 → 1,56 |
|---|
| #include "defines.h" |
| #include "TIMER5.h" |
| |
| static TIMER5_DATA *timer_data_ptr; |
| |
| void TIMER5_Init(TIMER5_DATA *data, void (*callback)(void), uint32_t time_us) { |
| if (data != NULL) // if ptr is null, use existing data |
| timer_data_ptr = data; |
| |
| timer_data_ptr->callback_function = callback; |
| |
| INTDisableInterrupts(); |
| |
| T5CON = 0x0; |
| |
| // PR5 is 16 bits wide, so we need to determine what pre-scaler to use |
| uint16_t time; |
| if (time_us < 13107) { |
| time = 5 * time_us; |
| T5CONSET = 0x0040; // Prescaler at 1:16 |
| } else if (time_us < 26214) { |
| time = 2.5 * time_us; |
| T5CONSET = 0x0050; // Prescaler at 1:32 |
| } else if (time_us < 52428) { |
| time = 1.25 * time_us; |
| T5CONSET = 0x0060; // Prescaler at 1:64 |
| } else { // Maximum time_us of 209712 |
| time = 0.3125 * time_us; |
| T5CONSET = 0x0070; // Prescaler at 1:256 |
| } |
| |
| Nop(); |
| TMR5 = 0x0; // Clear timer register |
| PR5 = time; // Load period register |
| // IPC5SET = 0x0000000D; // Set priority level = 3, sub-priority level = 1 |
| IPC5SET = 0x00000011; // Set priority level = 4, sub-priority level = 1 |
| IFS0CLR = 0x00100000; // Clear timer interrupt flag |
| IEC0SET = 0x00100000; // Enable timer interrupt |
| |
| INTEnableInterrupts(); |
| } |
| |
| void TIMER5_Start(void) { |
| T5CONSET = 0x8000; // Start timer |
| } |
| |
| void TIMER5_Stop(void) { |
| T5CONCLR = 0x8000; // Stop timer |
| } |
| |
| void __ISR(_TIMER_5_VECTOR, ipl4) __TIMER_5_Interrupt_Handler(void) { |
| // Call the saved callback function |
| (*timer_data_ptr->callback_function)(); |
| |
| IFS0CLR = 0x00100000; // Clear the timer interrupt flag |
| } |