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<!DOCTYPE <h <t <link </head><body> <!-- <div <h 00002 00003 00004 00005 00006 00007 00008 00009 00010 00011 00012 00013 00014 00015 00016 00017 00018 00019 00020 00021 00022 00023 00024 00025 00026 00027 00028 00029 00030 00031 00032 00033 00034 00035 00036 00037 00038 00039 00040 00041 00042 00043 00044 00045 { 00046 00047 pulseT1Init(); 00048 } 00049 00050 00051 { 00052 00053 00054 00055 00056 00057 00058 00059 00060 00061 00062 00063 00064 00065 00066 00067 00068 00069 } 00070 00071 00072 { 00073 00074 00075 00076 00077 00078 00079 00080 00081 00082 00083 00084 00085 00086 00087 } 00088 00089 00090 { 00091 00092 00093 00094 00095 00096 00097 00098 } 00099 00100 00101 { 00102 00103 00104 00105 00106 00107 00108 00109 } 00110 00111 00112 { 00113 00114 00115 { 00116 00117 00118 00119 } 00120 00121 { 00122 00123 00124 00125 } 00126 00127 00128 00129 00130 00131 00132 00133 00134 00135 00136 00137 00138 00139 00140 00141 } 00142 00143 00144 { 00145 00146 00147 { 00148 00149 00150 00151 } 00152 00153 { 00154 00155 00156 00157 } 00158 00159 00160 00161 00162 00163 00164 00165 00166 00167 00168 00169 00170 00171 00172 00173 00174 } 00175 00176 00177 { 00178 00179 00180 00181 00182 00183 } 00184 00185 00186 { 00187 00188 00189 00190 00191 00192 } 00193 00194 00195 { 00196 00197 00198 00199 } 00200 00201 00202 { 00203 00204 00205 00206 } 00207 00208 00209 { 00210 00211 00212 00213 { 00214 00215 00216 00217 00218 00219 00220 00221 00222 00223 00224 00225 00226 00227 00228 00229 00230 00231 00232 00233 00234 } 00235 00236 { 00237 00238 00239 00240 00241 00242 00243 } 00244 } 00245 00246 00247 { 00248 00249 00250 00251 { 00252 00253 00254 00255 00256 00257 00258 00259 00260 00261 00262 00263 00264 00265 00266 00267 00268 00269 00270 00271 00272 00273 } 00274 00275 { 00276 00277 00278 00279 00280 00281 00282 } 00283 } </ <a <img </body> </html>

HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> tml><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> itle>Procyon AVRlib: pulse.c Source File</title> href="dox.css" rel="stylesheet" type="text/css"> Generated by Doxygen 1.4.2 --> class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div> 1>pulse.c</h1><a href="pulse_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 /*! \file pulse.c \brief Pulse/frequency generation function library. */ //***************************************************************************** // // File Name : 'pulse.c' // Title : Pulse/frequency generation function library // Author : Pascal Stang - Copyright (C) 2000-2002 // Created : 2002-08-19 // Revised : 2003-05-29 // Version : 0.7 // Target MCU : Atmel AVR Series // Editor Tabs : 4 // // This code is distributed under the GNU Public License // which can be found at http://www.gnu.org/licenses/gpl.txt // //***************************************************************************** #include <avr/io.h> #include <avr/interrupt.h> #include <avr/pgmspace.h> #include "<a class="code" href="global_8h.html">global.h</a>" #include "<a class="code" href="timer_8h.html">timer.h</a>" #include "<a class="code" href="pulse_8h.html">pulse.h</a>" // Global variables // pulse generation registers volatile static unsigned char PulseT1AMode; volatile static unsigned short PulseT1ACount; volatile static unsigned short PulseT1APeriodTics; volatile static unsigned char PulseT1BMode; volatile static unsigned short PulseT1BCount; volatile static unsigned short PulseT1BPeriodTics; // pulse mode bit definitions // PULSE_MODE_COUNTED // if true, the requested number of pulses are output, then output is turned off // if false, pulses are output continuously #define PULSE_MODE_CONTINUOUS 0x00 #define PULSE_MODE_COUNTED 0x01 // functions void pulseInit(void) // initialize timer1 for pulse operation void pulseT1Init(void) // try to make sure that timer1 is in "normal" mode // most importantly, turn off PWM mode <a class="code" href="group__timerpwm.html#ga2">timer1PWMOff</a>(); // set some reasonable initial values // in case the user forgets to PulseT1AMode = 0; PulseT1BMode = 0; PulseT1ACount = 0; PulseT1BCount = 0; PulseT1APeriodTics = 0x8000; PulseT1BPeriodTics = 0x8000; // attach the pulse service routines to // the timer 1 output compare A and B interrupts <a class="code" href="group__timer.html#ga8">timerAttach</a>(TIMER1OUTCOMPAREA_INT,pulseT1AService); <a class="code" href="group__timer.html#ga8">timerAttach</a>(TIMER1OUTCOMPAREB_INT,pulseT1BService); void pulseT1Off(void) // turns pulse outputs off immediately // set pulse counters to zero (finished) PulseT1ACount = 0; PulseT1BCount = 0; // disconnect OutputCompare action from OC1A pin cbi(TCCR1A,COM1A1); cbi(TCCR1A,COM1A0); // disconnect OutputCompare action from OC1B pin cbi(TCCR1A,COM1B1); cbi(TCCR1A,COM1B0); // detach the pulse service routines <a class="code" href="group__timer.html#ga9">timerDetach</a>(TIMER1OUTCOMPAREA_INT); <a class="code" href="group__timer.html#ga9">timerDetach</a>(TIMER1OUTCOMPAREB_INT); void pulseT1ASetFreq(u16 freqHz) // set the frequency of the pulse output // we need to find the requested period/2 (in timer tics) // from the frequency (in hertz) // calculate how many tics in period/2 // this is the (timer tic rate)/(2*requested freq) PulseT1APeriodTics = ((u32)F_CPU/((u32)<a class="code" href="group__timer.html#ga7">timer1GetPrescaler</a>()*2*freqHz)); void pulseT1BSetFreq(u16 freqHz) // set the frequency of the pulse output // we need to find the requested period/2 (in timer tics) // from the frequency (in hertz) // calculate how many tics in period/2 // this is the (timer tic rate)/(2*requested freq) PulseT1BPeriodTics = ((u32)F_CPU/((u32)<a class="code" href="group__timer.html#ga7">timer1GetPrescaler</a>()*2*freqHz)); void pulseT1ARun(u16 nPulses) // set the number of pulses we want and the mode if(nPulses) // if the nPulses is non-zero, use "counted" mode PulseT1AMode |= PULSE_MODE_COUNTED; PulseT1ACount = nPulses<<1; else // if nPulses is zero, run forever PulseT1AMode &= ~PULSE_MODE_COUNTED; PulseT1ACount = 1<<1; // set OutputCompare action to toggle OC1A pin cbi(TCCR1A,COM1A1); sbi(TCCR1A,COM1A0); // now the "enabling" stuff // set the output compare one pulse cycle ahead of current timer position // to make sure we don't have to wait until the timer overflows and comes // back to the current value // set future output compare time to TCNT1 + PulseT1APeriodTics //outw(OCR1A, inw(TCNT1) + PulseT1APeriodTics); OCR1A += PulseT1APeriodTics; // enable OutputCompare interrupt sbi(TIMSK, OCIE1A); void pulseT1BRun(u16 nPulses) // set the number of pulses we want and the mode if(nPulses) // if the nPulses is non-zero, use "counted" mode PulseT1BMode |= PULSE_MODE_COUNTED; PulseT1BCount = nPulses<<1; else // if nPulses is zero, run forever PulseT1BMode &= ~PULSE_MODE_COUNTED; PulseT1BCount = 1<<1; // set OutputCompare action to toggle OC1B pin // (note: with all the A's and B's flying around, TCCR1A is not a bug) cbi(TCCR1A,COM1B1); sbi(TCCR1A,COM1B0); // now the "enabling" stuff // set the output compare one pulse cycle ahead of current timer position // to make sure we don't have to wait until the timer overflows and comes // back to the current value // set future output compare time to TCNT1 + PulseT1APeriodTics //outw(OCR1B, inw(TCNT1) + PulseT1BPeriodTics); OCR1B += PulseT1BPeriodTics; // enable OutputCompare interrupt sbi(TIMSK, OCIE1B); void pulseT1AStop(void) // stop output regardless of remaining pulses or mode // go to "counted" mode PulseT1AMode |= PULSE_MODE_COUNTED; // set pulses to zero PulseT1ACount = 0; void pulseT1BStop(void) // stop output regardless of remaining pulses or mode // go to "counted" mode PulseT1BMode |= PULSE_MODE_COUNTED; // set pulses to zero PulseT1BCount = 0; u16 pulseT1ARemaining(void) // return the number of pulses remaining for channel A // add 1 to make sure we round up, >>1 equivalent to /2 return (PulseT1ACount+1)>>1; u16 pulseT1BRemaining(void) // return the number of pulses remaining for channel A // add 1 to make sure we round up, >>1 equivalent to /2 return (PulseT1BCount+1)>>1; void pulseT1AService(void) // check if TimerPulseACount is non-zero // (i.e. pulses are still requested) if(PulseT1ACount) //u16 OCValue; // read in current value of output compare register OCR1A //OCValue = inp(OCR1AL); // read low byte of OCR1A //OCValue += inp(OCR1AH)<<8; // read high byte of OCR1A // increment OCR1A value by PulseT1APeriodTics //OCValue += PulseT1APeriodTics; // set future output compare time to this new value //outp((OCValue>>8), OCR1AH); // write high byte //outp((OCValue & 0x00FF),OCR1AL); // write low byte // the following line should be identical in operation // to the lines above, but for the moment, I'm not convinced // this method is bug-free. At least it's simpler! //outw(OCR1A, inw(OCR1A) + PulseT1APeriodTics); // change again OCR1A += PulseT1APeriodTics; // decrement the number of pulses executed if(PulseT1AMode & PULSE_MODE_COUNTED) PulseT1ACount--; else // pulse count has reached zero // disable the output compare's action on OC1A pin cbi(TCCR1A,COM1A1); cbi(TCCR1A,COM1A0); // and disable the output compare's interrupt to stop pulsing cbi(TIMSK, OCIE1A); void pulseT1BService(void) // check if TimerPulseACount is non-zero // (i.e. pulses are still requested) if(PulseT1BCount) //u16 OCValue; // read in current value of output compare register OCR1B //OCValue = inp(OCR1BL); // read low byte of OCR1B //OCValue += inp(OCR1BH)<<8; // read high byte of OCR1B // increment OCR1B value by PulseT1BPeriodTics //OCValue += PulseT1BPeriodTics; // set future output compare time to this new value //outp((OCValue>>8), OCR1BH); // write high byte //outp((OCValue & 0x00FF),OCR1BL); // write low byte // the following line should be identical in operation // to the lines above, but for the moment, I'm not convinced // this method is bug-free. At least it's simpler! //outw(OCR1B, inw(OCR1B) + PulseT1BPeriodTics); // change again OCR1B += PulseT1BPeriodTics; // decrement the number of pulses executed if(PulseT1BMode & PULSE_MODE_COUNTED) PulseT1BCount--; else // pulse count has reached zero // disable the output compare's action on OC1B pin cbi(TCCR1A,COM1B1); cbi(TCCR1A,COM1B0); // and disable the output compare's interrupt to stop pulsing cbi(TIMSK, OCIE1B); pre></div><hr size="1"><address style="align: right;">Generated on Sun Oct 29 03:41:07 2006 for Procyon AVRlib by  href="http://www.doxygen.org/index.html"> src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </address>

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