diff options
Diffstat (limited to '2.3-1/src/c/hardware/avr/timer/u8AVRTimerSetups.c')
| -rw-r--r-- | 2.3-1/src/c/hardware/avr/timer/u8AVRTimerSetups.c | 138 |
1 files changed, 103 insertions, 35 deletions
diff --git a/2.3-1/src/c/hardware/avr/timer/u8AVRTimerSetups.c b/2.3-1/src/c/hardware/avr/timer/u8AVRTimerSetups.c index 1d93429b..6ee8d2af 100644 --- a/2.3-1/src/c/hardware/avr/timer/u8AVRTimerSetups.c +++ b/2.3-1/src/c/hardware/avr/timer/u8AVRTimerSetups.c @@ -1,42 +1,110 @@ -// Function to setup timer on AVR -// -// Calling Sequence -// u8AVRTimerSetups(timer, prescalar) -// -// Parameters -// timer: timer to be set up (0,1,2) -// prescalar: prescalar to be used for timer (0-7) -// ***Refer datasheet for more description about timer -// -// Description -// This function sets prescalr for timers. 'timer' decides which of the -// three (0,1,2) timers available to be used. The 'prescalar' is needed for -// deciding timer clock. Select appropriate prescalar depending on MCU clock -// and requirement. -// -// -// Authors -// Siddhesh Wani -// +/* Copyright (C) 2016 - IIT Bombay - FOSSEE + This file must be used under the terms of the CeCILL. + This source file is licensed as described in the file COPYING, which + you should have received as part of this distribution. The terms + are also available at + http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt + Author: Ashish Kamble + Organization: FOSSEE, IIT Bombay + Email: toolbox@scilab.in +*/ +//Function selects the clock source and timer with prescaler. #include "AVRPeripheralTimer.h" - -uint8 u8AVRTimerSetups(uint8 timer,uint8 prescalar) +uint8 u8AVRTimerSetups(uint8 timer,uint16 prescaler,uint8 clock_source) { - switch(timer) - { - case 0: - TCCR0|= (prescalar & 0x07); //Select clock source - break; - case 1: - break; - case 2: - TCCR2|= (prescalar & 0x07); //Select clock source - break; - } - - return 0; + + if(clock_source==0) + { + if(timer==0) + { + switch(prescaler) + { + case 1: TCCR0 |= (1<<CS00); + TCNT0 = 0x00; + case 8: TCCR0 |= (1<<CS01); + TCNT0 = 0x00; + case 64: TCCR0 |= (1<<CS00)|(1<<CS01); + TCNT0 = 0x00; + case 256: TCCR0 |= (1<<CS02); + TCNT0 = 0x00; + case 1024: TCCR0 |= (1<<CS00)|(1<<CS02); + TCNT0 = 0x00; + } + } + else if(timer==2) + { + switch(prescaler) + { + case 1: TCCR2 |= (1<<CS20); + TCNT2 = 0x00; + case 8: TCCR2 |= (1<<CS21); + TCNT2 = 0x00; + case 64: TCCR2 |= (1<<CS20)|(1<<CS21); + TCNT2 = 0x00; + case 256: TCCR2 |= (1<<CS22); + TCNT2 = 0x00; + case 1024: TCCR2 |= (1<<CS20)|(1<<CS22); + TCNT2 = 0x00; + } + } + else if(timer==1) + { + switch(prescaler) + { + case 1: TCCR1B |= (1<<CS10); + TCNT1H = 0x00; + TCNT1L = 0x00; + case 8: TCCR1B |= (1<<CS11); + TCNT1H = 0x00; + TCNT1L = 0x00; + case 64: TCCR1B |= (1<<CS10)|(1<<CS11); + TCNT1H = 0x00; + TCNT1L = 0x00; + case 256: TCCR1B |= (1<<CS12); + TCNT1H = 0x00; + TCNT1L = 0x00; + case 1024: TCCR1B |= (1<<CS10)|(1<<CS12); + TCNT1H = 0x00; + TCNT1L = 0x00; + } + } + } + else if(clock_source==1) + { + if(timer==0) + { + TCCR0 |= (1<<CS00)|(1<<CS01)|(1<<CS02); + TCNT0 = 0x00; + } + else if(timer==2) + { + TCCR2 |= (1<<CS20)|(1<<CS21)|(1<<CS22); + TCNT2 = 0x00; + } + else if(timer==1) + { + TCCR1B |= (1<<CS10)|(1<<CS11)|(1<<CS12); + TCNT1H = 0x00; + TCNT1L = 0x00; + } + } + return 0; } + + + + + + + + + + + + + + |