root / Version 0.9 / RS232_MUX.X / hardware_timer.h @ master
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| 1 | 10dcb6e9 | Enzo Niro | /* Microchip Technology Inc. and its subsidiaries. You may use this software
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| 2 | * and any derivatives exclusively with Microchip products.
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| 3 | *
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| 4 | * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
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| 5 | * EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED
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| 6 | * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
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| 7 | * PARTICULAR PURPOSE, OR ITS INTERACTION WITH MICROCHIP PRODUCTS, COMBINATION
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| 8 | * WITH ANY OTHER PRODUCTS, OR USE IN ANY APPLICATION.
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| 9 | *
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| 10 | * IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
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| 11 | * INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
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| 12 | * WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS
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| 13 | * BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE
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| 14 | * FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS
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| 15 | * IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF
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| 16 | * ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
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| 17 | *
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| 18 | * MICROCHIP PROVIDES THIS SOFTWARE CONDITIONALLY UPON YOUR ACCEPTANCE OF THESE
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| 19 | * TERMS.
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| 20 | */
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| 21 | |||
| 22 | /*
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| 23 | * File: hardware_timer.h
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| 24 | * Author: Enzo Niro
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| 25 | * Comments: Library made for RS232 MUX board
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| 26 | * Revision history: 1.0
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| 27 | */
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| 28 | |||
| 29 | // This is a guard condition so that contents of this file are not included
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| 30 | // more than once.
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| 31 | #ifndef RS232_HARDWARETIMER_H
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| 32 | #define RS232_HARDWARETIMER_H
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| 33 | |||
| 34 | #include <xc.h> // include processor files - each processor file is guarded. |
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| 35 | |||
| 36 | |||
| 37 | #define CLK_DIV1 0x00 |
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| 38 | #define CLK_DIV2 0x01 |
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| 39 | #define CLK_DIV4 0x02 |
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| 40 | #define CLK_DIV8 0x03 |
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| 41 | #define CLK_DIV16 0x04 |
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| 42 | #define CLK_DIV64 0x05 |
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| 43 | #define CLK_DIV256 0x06 |
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| 44 | #define CLK_DIV1024 0x07 |
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| 45 | |||
| 46 | #define SEL_CLK CLK_DIV1
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| 47 | |||
| 48 | #ifdef __cplusplus
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| 49 | extern "C" { |
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| 50 | #endif /* __cplusplus */ |
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| 51 | |||
| 52 | |||
| 53 | uint32_t _timerA0Cnt = 0;
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| 54 | |||
| 55 | //Timer interrupt init
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| 56 | void timerInterruptInit(uint16_t maxCounts)
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| 57 | {
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| 58 | //Init Timer interrupt type A
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| 59 | //To avoid fast interruption that slow main program, divide clock by 2 !
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| 60 | //We use here timer interrupt 0 in normal mode
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| 61 | |||
| 62 | //At first, define the timer period
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| 63 | TCA0.SINGLE.PERH = maxCounts >> 8;
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| 64 | TCA0.SINGLE.PERL = maxCounts & 0xFF;
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| 65 | TCA0.SINGLE.CTRLA = (SEL_CLK << 1) | 1; //Enable and CLK_DIV2 |
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| 66 | TCA0.SINGLE.CTRLB = 0x00; //Set Normal operation for timer, no autolock, no waveform output |
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| 67 | TCA0.SINGLE.EVCTRL = 0x00; //No specific action and counter event input |
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| 68 | TCA0.SINGLE.INTCTRL = 0x01; //Set interrupt on timer overflow |
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| 69 | } |
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| 70 | |||
| 71 | //Get number of subcounts made
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| 72 | uint32_t getTimerCounts(void)
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| 73 | {
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| 74 | return _timerA0Cnt;
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| 75 | } |
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| 76 | |||
| 77 | //Timer interrupt callback
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| 78 | ISR(TCA0_OVF_vect) |
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| 79 | {
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| 80 | _timerA0Cnt++; |
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| 81 | TCA0.SINGLE.INTFLAGS = 1; //Must clear the flag by writing 1 on this bit (datasheet p.232) |
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| 82 | } |
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| 83 | |||
| 84 | |||
| 85 | #ifdef __cplusplus
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| 86 | } |
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| 87 | #endif /* __cplusplus */ |
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| 88 | |||
| 89 | #endif /* XC_HEADER_TEMPLATE_H */ |