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1 | 6 | kaklik | /*! \file timer128.h \brief System Timer function library for Mega128. */ |
2 | //***************************************************************************** |
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3 | // |
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4 | // File Name : 'timer128.h' |
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5 | // Title : System Timer function library for Mega128 |
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6 | // Author : Pascal Stang - Copyright (C) 2000-2003 |
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7 | // Created : 11/22/2000 |
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8 | // Revised : 02/10/2003 |
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9 | // Version : 1.1 |
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10 | // Target MCU : Atmel AVR Series |
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11 | // Editor Tabs : 4 |
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12 | // |
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13 | // This code is distributed under the GNU Public License |
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14 | // which can be found at http://www.gnu.org/licenses/gpl.txt |
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15 | // |
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16 | /// \ingroup driver_avr |
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17 | /// \defgroup timer128 Timer Function Library for ATmega128 (timer128.c) |
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18 | /// \code #include "timer128.h" \endcode |
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19 | /// \par Overview |
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20 | /// This library provides functions for use with the timers internal to the |
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21 | /// AVR ATmega128. Functions include initialization, set prescaler, |
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22 | /// calibrated pause function (in milliseconds), attaching and detaching |
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23 | /// of user functions to interrupts, overflow counters, and PWM. |
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24 | /// |
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25 | /// \par About Timers |
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26 | /// The Atmel AVR-series processors each contain at least one |
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27 | /// hardware timer/counter. Many of the processors contain 2 or 3 |
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28 | /// timers. Generally speaking, a timer is a hardware counter inside |
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29 | /// the processor which counts at a rate related to the main CPU clock |
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30 | /// frequency. Because the counter value increasing (counting up) at |
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31 | /// a precise rate, we can use it as a timer to create or measure |
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32 | /// precise delays, schedule events, or generate signals of a certain |
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33 | /// frequency or pulse-width. |
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34 | /// \par |
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35 | /// As an example, the ATmega163 processor has 3 timer/counters. |
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36 | /// Timer0, Timer1, and Timer2 are 8, 16, and 8 bits wide respectively. |
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37 | /// This means that they overflow, or roll over back to zero, at a |
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38 | /// count value of 256 for 8bits or 65536 for 16bits. A prescaler is |
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39 | /// avaiable for each timer, and the prescaler allows you to pre-divide |
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40 | /// the main CPU clock rate down to a slower speed before feeding it to |
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41 | /// the counting input of a timer. For example, if the CPU clock |
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42 | /// frequency is 3.69MHz, and Timer0's prescaler is set to divide-by-8, |
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43 | /// then Timer0 will "tic" at 3690000/8 = 461250Hz. Because Timer0 is |
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44 | /// an 8bit timer, it will count to 256 in just 256/461250Hz = 0.555ms. |
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45 | /// In fact, when it hits 255, it will overflow and start again at |
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46 | /// zero. In this case, Timer0 will overflow 461250/256 = 1801.76 |
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47 | /// times per second. |
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48 | /// \par |
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49 | /// Timer0 can be used a number of ways simultaneously. First, the |
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50 | /// value of the timer can be read by accessing the CPU register \c TCNT0. |
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51 | /// We could, for example, figure out how long it takes to execute a |
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52 | /// C command by recording the value of \c TCNT0 before and after |
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53 | /// execution, then subtract (after-before) = time elapsed. Or we can |
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54 | /// enable the overflow interrupt which goes off every time T0 |
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55 | /// overflows and count out longer delays (multiple overflows), or |
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56 | /// execute a special periodic function at every overflow. |
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57 | /// \par |
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58 | /// The other timers (Timer1 and Timer2) offer all the abilities of |
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59 | /// Timer0 and many more features. Both T1 and T2 can operate as |
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60 | /// general-purpose timers, but T1 has special hardware allowing it to |
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61 | /// generate PWM signals, while T2 is specially designed to help count |
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62 | /// out real time (like hours, minutes, seconds). See the |
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63 | /// Timer/Counter section of the processor datasheet for more info. |
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64 | /// |
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65 | //***************************************************************************** |
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66 | //@{ |
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67 | |||
68 | #ifndef TIMER128_H |
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69 | #define TIMER128_H |
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70 | |||
71 | #include "global.h" |
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72 | |||
73 | // constants/macros/typdefs |
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74 | |||
75 | // Timer/clock prescaler values and timer overflow rates |
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76 | // tics = rate at which the timer counts up |
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77 | // 8bitoverflow = rate at which the timer overflows 8bits (or reaches 256) |
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78 | // 16bit [overflow] = rate at which the timer overflows 16bits (65536) |
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79 | // |
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80 | // overflows can be used to generate periodic interrupts |
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81 | // |
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82 | // for 8MHz crystal |
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83 | // 0 = STOP (Timer not counting) |
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84 | // 1 = CLOCK tics= 8MHz 8bitoverflow= 31250Hz 16bit= 122.070Hz |
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85 | // 2 = CLOCK/8 tics= 1MHz 8bitoverflow= 3906.25Hz 16bit= 15.259Hz |
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86 | // 3 = CLOCK/64 tics= 125kHz 8bitoverflow= 488.28Hz 16bit= 1.907Hz |
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87 | // 4 = CLOCK/256 tics= 31250Hz 8bitoverflow= 122.07Hz 16bit= 0.477Hz |
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88 | // 5 = CLOCK/1024 tics= 7812.5Hz 8bitoverflow= 30.52Hz 16bit= 0.119Hz |
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89 | // 6 = External Clock on T(x) pin (falling edge) |
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90 | // 7 = External Clock on T(x) pin (rising edge) |
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91 | |||
92 | // for 4MHz crystal |
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93 | // 0 = STOP (Timer not counting) |
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94 | // 1 = CLOCK tics= 4MHz 8bitoverflow= 15625Hz 16bit= 61.035Hz |
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95 | // 2 = CLOCK/8 tics= 500kHz 8bitoverflow= 1953.125Hz 16bit= 7.629Hz |
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96 | // 3 = CLOCK/64 tics= 62500Hz 8bitoverflow= 244.141Hz 16bit= 0.954Hz |
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97 | // 4 = CLOCK/256 tics= 15625Hz 8bitoverflow= 61.035Hz 16bit= 0.238Hz |
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98 | // 5 = CLOCK/1024 tics= 3906.25Hz 8bitoverflow= 15.259Hz 16bit= 0.060Hz |
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99 | // 6 = External Clock on T(x) pin (falling edge) |
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100 | // 7 = External Clock on T(x) pin (rising edge) |
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101 | |||
102 | // for 3.69MHz crystal |
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103 | // 0 = STOP (Timer not counting) |
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104 | // 1 = CLOCK tics= 3.69MHz 8bitoverflow= 14414Hz 16bit= 56.304Hz |
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105 | // 2 = CLOCK/8 tics= 461250Hz 8bitoverflow= 1801.758Hz 16bit= 7.038Hz |
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106 | // 3 = CLOCK/64 tics= 57625.25Hz 8bitoverflow= 225.220Hz 16bit= 0.880Hz |
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107 | // 4 = CLOCK/256 tics= 14414.063Hz 8bitoverflow= 56.305Hz 16bit= 0.220Hz |
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108 | // 5 = CLOCK/1024 tics= 3603.516Hz 8bitoverflow= 14.076Hz 16bit= 0.055Hz |
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109 | // 6 = External Clock on T(x) pin (falling edge) |
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110 | // 7 = External Clock on T(x) pin (rising edge) |
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111 | |||
112 | // for 32.768KHz crystal on timer 2 (use for real-time clock) |
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113 | // 0 = STOP |
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114 | // 1 = CLOCK tics= 32.768kHz 8bitoverflow= 128Hz |
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115 | // 2 = CLOCK/8 tics= 4096kHz 8bitoverflow= 16Hz |
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116 | // 3 = CLOCK/64 tics= 512Hz 8bitoverflow= 2Hz |
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117 | // 4 = CLOCK/256 tics= 128Hz 8bitoverflow= 0.5Hz |
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118 | // 5 = CLOCK/1024 tics= 32Hz 8bitoverflow= 0.125Hz |
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119 | |||
120 | #define TIMER_CLK_STOP 0x00 ///< Timer Stopped |
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121 | #define TIMER_CLK_DIV1 0x01 ///< Timer clocked at F_CPU |
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122 | #define TIMER_CLK_DIV8 0x02 ///< Timer clocked at F_CPU/8 |
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123 | #define TIMER_CLK_DIV64 0x03 ///< Timer clocked at F_CPU/64 |
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124 | #define TIMER_CLK_DIV256 0x04 ///< Timer clocked at F_CPU/256 |
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125 | #define TIMER_CLK_DIV1024 0x05 ///< Timer clocked at F_CPU/1024 |
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126 | #define TIMER_CLK_T_FALL 0x06 ///< Timer clocked at T falling edge |
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127 | #define TIMER_CLK_T_RISE 0x07 ///< Timer clocked at T rising edge |
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128 | #define TIMER_PRESCALE_MASK 0x07 ///< Timer Prescaler Bit-Mask |
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129 | |||
130 | #define TIMERRTC_CLK_STOP 0x00 ///< RTC Timer Stopped |
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131 | #define TIMERRTC_CLK_DIV1 0x01 ///< RTC Timer clocked at F_CPU |
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132 | #define TIMERRTC_CLK_DIV8 0x02 ///< RTC Timer clocked at F_CPU/8 |
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133 | #define TIMERRTC_CLK_DIV32 0x03 ///< RTC Timer clocked at F_CPU/32 |
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134 | #define TIMERRTC_CLK_DIV64 0x04 ///< RTC Timer clocked at F_CPU/64 |
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135 | #define TIMERRTC_CLK_DIV128 0x05 ///< RTC Timer clocked at F_CPU/128 |
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136 | #define TIMERRTC_CLK_DIV256 0x06 ///< RTC Timer clocked at F_CPU/256 |
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137 | #define TIMERRTC_CLK_DIV1024 0x07 ///< RTC Timer clocked at F_CPU/1024 |
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138 | #define TIMERRTC_PRESCALE_MASK 0x07 ///< RTC Timer Prescaler Bit-Mask |
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139 | |||
140 | // default prescale settings for the timers |
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141 | // these settings are applied when you call |
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142 | // timerInit or any of the timer<x>Init |
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143 | #define TIMER0PRESCALE TIMERRTC_CLK_DIV64 ///< timer 0 prescaler default |
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144 | #define TIMER1PRESCALE TIMER_CLK_DIV64 ///< timer 1 prescaler default |
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145 | #define TIMER2PRESCALE TIMER_CLK_DIV8 ///< timer 2 prescaler default |
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146 | #define TIMER3PRESCALE TIMER_CLK_DIV64 ///< timer 3 prescaler default |
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147 | |||
148 | // interrupt macros for attaching user functions to timer interrupts |
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149 | // use these with timerAttach( intNum, function ) |
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150 | // timer 0 |
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151 | #define TIMER0OVERFLOW_INT 0 |
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152 | #define TIMER0OUTCOMPARE_INT 1 |
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153 | // timer 1 |
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154 | #define TIMER1OVERFLOW_INT 2 |
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155 | #define TIMER1OUTCOMPAREA_INT 3 |
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156 | #define TIMER1OUTCOMPAREB_INT 4 |
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157 | #define TIMER1OUTCOMPAREC_INT 5 |
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158 | #define TIMER1INPUTCAPTURE_INT 6 |
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159 | // timer 2 |
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160 | #define TIMER2OVERFLOW_INT 7 |
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161 | #define TIMER2OUTCOMPARE_INT 8 |
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162 | // timer 3 |
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163 | #define TIMER3OVERFLOW_INT 9 |
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164 | #define TIMER3OUTCOMPAREA_INT 10 |
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165 | #define TIMER3OUTCOMPAREB_INT 11 |
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166 | #define TIMER3OUTCOMPAREC_INT 12 |
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167 | #define TIMER3INPUTCAPTURE_INT 13 |
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168 | |||
169 | #define TIMER_NUM_INTERRUPTS 14 |
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170 | |||
171 | // type of interrupt handler to use for timers |
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172 | // *do not change unless you know what you're doing |
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173 | // Value may be SIGNAL or INTERRUPT |
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174 | #ifndef TIMER_INTERRUPT_HANDLER |
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175 | #define TIMER_INTERRUPT_HANDLER SIGNAL |
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176 | #endif |
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177 | |||
178 | // functions |
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179 | #define delay delay_us |
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180 | #define delay_ms timerPause |
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181 | void delay_us(unsigned short time_us); |
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182 | |||
183 | // initializes timing system |
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184 | // runs all timer init functions |
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185 | // sets all timers to default prescale values #defined in systimer.c |
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186 | void timerInit(void); |
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187 | |||
188 | // default initialization routines for each timer |
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189 | void timer0Init(void); |
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190 | void timer1Init(void); |
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191 | void timer2Init(void); |
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192 | void timer3Init(void); |
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193 | |||
194 | // Clock prescaler set/get commands for each timer/counter |
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195 | // For setting the prescaler, you should use one of the #defines |
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196 | // above like TIMER_CLK_DIVx, where [x] is the division rate |
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197 | // you want. |
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198 | // When getting the current prescaler setting, the return value |
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199 | // will be the [x] division value currently set. |
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200 | void timer0SetPrescaler(u08 prescale); ///< set timer0 prescaler division index |
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201 | void timer1SetPrescaler(u08 prescale); ///< set timer1 prescaler division index |
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202 | void timer2SetPrescaler(u08 prescale); ///< set timer2 prescaler division index |
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203 | void timer3SetPrescaler(u08 prescale); ///< set timer3 prescaler division index |
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204 | u16 timer0GetPrescaler(void); ///< get timer0 prescaler division rate |
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205 | u16 timer1GetPrescaler(void); ///< get timer1 prescaler division rate |
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206 | u16 timer2GetPrescaler(void); ///< get timer2 prescaler division rate |
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207 | u16 timer3GetPrescaler(void); ///< get timer3 prescaler division rate |
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208 | |||
209 | |||
210 | // TimerAttach and Detach commands |
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211 | // These functions allow the attachment (or detachment) of any user function |
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212 | // to a timer interrupt. "Attaching" one of your own functions to a timer |
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213 | // interrupt means that it will be called whenever that interrupt happens. |
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214 | // Using attach is better than rewriting the actual INTERRUPT() function |
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215 | // because your code will still work and be compatible if the timer library |
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216 | // is updated. Also, using Attach allows your code and any predefined timer |
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217 | // code to work together and at the same time. (ie. "attaching" your own |
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218 | // function to the timer0 overflow doesn't prevent timerPause from working, |
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219 | // but rather allows you to share the interrupt.) |
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220 | // |
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221 | // timerAttach(TIMER1OVERFLOW_INT, myOverflowFunction); |
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222 | // timerDetach(TIMER1OVERFLOW_INT) |
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223 | // |
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224 | // timerAttach causes the myOverflowFunction() to be attached, and therefore |
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225 | // execute, whenever an overflow on timer1 occurs. timerDetach removes the |
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226 | // association and executes no user function when the interrupt occurs. |
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227 | // myOverflowFunction must be defined with no return value and no arguments: |
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228 | // |
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229 | // void myOverflowFunction(void) { ... } |
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230 | |||
231 | void timerAttach(u08 interruptNum, void (*userFunc)(void) ); |
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232 | void timerDetach(u08 interruptNum); |
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233 | |||
234 | |||
235 | // timing commands |
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236 | // timerPause pauses for the number of milliseconds specified in <pause_ms> |
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237 | void timerPause(unsigned short pause_ms); |
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238 | |||
239 | // overflow counters |
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240 | // to be documented |
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241 | void timer0ClearOverflowCount(void); |
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242 | long timer0GetOverflowCount(void); |
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243 | void timer2ClearOverflowCount(void); |
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244 | long timer2GetOverflowCount(void); |
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245 | |||
246 | // PWM initialization and set commands for timerX (where X is either 1 or 3) |
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247 | // timerXPWMInit() |
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248 | // configures the timerX hardware for PWM mode on pins OCXA, OCXB, and OCXC. |
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249 | // bitRes should be 8,9,or 10 for 8,9,or 10bit PWM resolution |
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250 | // |
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251 | // timerXPWMOff() |
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252 | // turns off all timerX PWM output and set timer mode to normal state |
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253 | // |
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254 | // timerXPWMAOn(), timerXPWMBOn(), timerXPWMCOn() |
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255 | // turn on output of PWM signals to OCXA,B,C pins |
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256 | // NOTE: Until you define the OCXA,B,C pins as outputs, and run |
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257 | // this "on" command, no PWM output will be output |
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258 | // |
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259 | // timerXPWMAOff(), timerXPWMBOff(), timerXPWMCOff() |
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260 | // turn off output of PWM signals to OCXA,B,C pins |
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261 | // |
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262 | // timerXPWMASet(), timer1PWMBSet(), timerXPWMCSet() |
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263 | // sets the PWM duty cycle for each channel |
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264 | // NOTE: <pwmDuty> should be in the range 0-255 for 8bit PWM |
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265 | // <pwmDuty> should be in the range 0-511 for 9bit PWM |
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266 | // <pwmDuty> should be in the range 0-1023 for 10bit PWM |
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267 | // NOTE: the PWM frequency can be controlled in increments by setting the |
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268 | // prescaler for timer1 |
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269 | |||
270 | void timer1PWMInit(u08 bitRes); ///< initialize and set timer1 mode to PWM |
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271 | void timer1PWMInitICR(u16 topcount);///< initialize and set timer1 mode to PWM with specific top count |
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272 | void timer1PWMOff(void); ///< turn off all timer1 PWM output and set timer mode to normal |
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273 | void timer1PWMAOn(void); ///< turn on timer1 Channel A (OC1A) PWM output |
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274 | void timer1PWMBOn(void); ///< turn on timer1 Channel B (OC1B) PWM output |
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275 | void timer1PWMCOn(void); ///< turn on timer1 Channel C (OC1C) PWM output |
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276 | void timer1PWMAOff(void); ///< turn off timer1 Channel A (OC1A) PWM output |
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277 | void timer1PWMBOff(void); ///< turn off timer1 Channel B (OC1B) PWM output |
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278 | void timer1PWMCOff(void); ///< turn off timer1 Channel C (OC1C) PWM output |
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279 | void timer1PWMASet(u16 pwmDuty); ///< set duty of timer1 Channel A (OC1A) PWM output |
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280 | void timer1PWMBSet(u16 pwmDuty); ///< set duty of timer1 Channel B (OC1B) PWM output |
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281 | void timer1PWMCSet(u16 pwmDuty); ///< set duty of timer1 Channel C (OC1C) PWM output |
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282 | |||
283 | void timer3PWMInit(u08 bitRes); ///< initialize and set timer3 mode to PWM |
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284 | void timer3PWMInitICR(u16 topcount);///< initialize and set timer3 mode to PWM with specific top count |
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285 | void timer3PWMOff(void); ///< turn off all timer3 PWM output and set timer mode to normal |
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286 | void timer3PWMAOn(void); ///< turn on timer3 Channel A (OC3A) PWM output |
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287 | void timer3PWMBOn(void); ///< turn on timer3 Channel B (OC3B) PWM output |
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288 | void timer3PWMCOn(void); ///< turn on timer3 Channel C (OC3C) PWM output |
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289 | void timer3PWMAOff(void); ///< turn off timer3 Channel A (OC3A) PWM output |
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290 | void timer3PWMBOff(void); ///< turn off timer3 Channel B (OC3B) PWM output |
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291 | void timer3PWMCOff(void); ///< turn off timer3 Channel C (OC3C) PWM output |
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292 | void timer3PWMASet(u16 pwmDuty); ///< set duty of timer3 Channel A (OC3A) PWM output |
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293 | void timer3PWMBSet(u16 pwmDuty); ///< set duty of timer3 Channel B (OC3B) PWM output |
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294 | void timer3PWMCSet(u16 pwmDuty); ///< set duty of timer3 Channel C (OC3C) PWM output |
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295 | |||
296 | //@} |
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297 | |||
298 | // Pulse generation commands have been moved to the pulse.c library |
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299 | |||
300 | #endif |
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