timer_8h-source.html

avr应用测试程序

00103 <span class="comment">// 7 = External Clock on T(x) pin (rising edge)</span>
00104 
00105 <span class="comment">// for 4MHz crystal</span>
00106 <span class="comment">// 0 = STOP (Timer not counting)</span>
00107 <span class="comment">// 1 = CLOCK        tics= 4MHz          8bitoverflow= 15625Hz       16bit=  61.035Hz</span>
00108 <span class="comment">// 2 = CLOCK/8      tics= 500kHz        8bitoverflow= 1953.125Hz    16bit=   7.629Hz</span>
00109 <span class="comment">// 3 = CLOCK/64     tics= 62500Hz       8bitoverflow=  244.141Hz    16bit=   0.954Hz</span>
00110 <span class="comment">// 4 = CLOCK/256    tics= 15625Hz       8bitoverflow=   61.035Hz    16bit=   0.238Hz</span>
00111 <span class="comment">// 5 = CLOCK/1024   tics= 3906.25Hz     8bitoverflow=   15.259Hz    16bit=   0.060Hz</span>
00112 <span class="comment">// 6 = External Clock on T(x) pin (falling edge)</span>
00113 <span class="comment">// 7 = External Clock on T(x) pin (rising edge)</span>
00114 
00115 <span class="comment">// for 3.69MHz crystal</span>
00116 <span class="comment">// 0 = STOP (Timer not counting)</span>
00117 <span class="comment">// 1 = CLOCK        tics= 3.69MHz       8bitoverflow= 14414Hz       16bit=  56.304Hz</span>
00118 <span class="comment">// 2 = CLOCK/8      tics= 461250Hz      8bitoverflow= 1801.758Hz    16bit=   7.038Hz</span>
00119 <span class="comment">// 3 = CLOCK/64     tics= 57625.25Hz    8bitoverflow=  225.220Hz    16bit=   0.880Hz</span>
00120 <span class="comment">// 4 = CLOCK/256    tics= 14414.063Hz   8bitoverflow=   56.305Hz    16bit=   0.220Hz</span>
00121 <span class="comment">// 5 = CLOCK/1024   tics=  3603.516Hz   8bitoverflow=   14.076Hz    16bit=   0.055Hz</span>
00122 <span class="comment">// 6 = External Clock on T(x) pin (falling edge)</span>
00123 <span class="comment">// 7 = External Clock on T(x) pin (rising edge)</span>
00124 
00125 <span class="comment">// for 32.768KHz crystal on timer 2 (use for real-time clock)</span>
00126 <span class="comment">// 0 = STOP</span>
00127 <span class="comment">// 1 = CLOCK        tics= 32.768kHz     8bitoverflow= 128Hz</span>
00128 <span class="comment">// 2 = CLOCK/8      tics= 4096kHz       8bitoverflow=  16Hz</span>
00129 <span class="comment">// 3 = CLOCK/32     tics= 1024kHz       8bitoverflow=   4Hz</span>
00130 <span class="comment">// 4 = CLOCK/64     tics= 512Hz         8bitoverflow=   2Hz</span>
00131 <span class="comment">// 5 = CLOCK/128    tics= 256Hz         8bitoverflow=   1Hz</span>
00132 <span class="comment">// 6 = CLOCK/256    tics= 128Hz         8bitoverflow=   0.5Hz</span>
00133 <span class="comment">// 7 = CLOCK/1024   tics= 32Hz          8bitoverflow=   0.125Hz</span>
00134 
<a name="l00135"></a><a class="code" href="group__timer.html#ga15">00135</a> <span class="preprocessor">#define TIMER_CLK_STOP          0x00    </span><span class="comment">///&lt; Timer Stopped</span>
<a name="l00136"></a><a class="code" href="group__timer.html#ga16">00136</a> <span class="comment"></span>#define TIMER_CLK_DIV1          0x01    <span class="comment">///&lt; Timer clocked at F_CPU</span>
<a name="l00137"></a><a class="code" href="group__timer.html#ga17">00137</a> <span class="comment"></span>#define TIMER_CLK_DIV8          0x02    <span class="comment">///&lt; Timer clocked at F_CPU/8</span>
<a name="l00138"></a><a class="code" href="group__timer.html#ga18">00138</a> <span class="comment"></span>#define TIMER_CLK_DIV64         0x03    <span class="comment">///&lt; Timer clocked at F_CPU/64</span>
<a name="l00139"></a><a class="code" href="group__timer.html#ga19">00139</a> <span class="comment"></span>#define TIMER_CLK_DIV256        0x04    <span class="comment">///&lt; Timer clocked at F_CPU/256</span>
<a name="l00140"></a><a class="code" href="group__timer.html#ga20">00140</a> <span class="comment"></span>#define TIMER_CLK_DIV1024       0x05    <span class="comment">///&lt; Timer clocked at F_CPU/1024</span>
<a name="l00141"></a><a class="code" href="group__timer.html#ga21">00141</a> <span class="comment"></span>#define TIMER_CLK_T_FALL        0x06    <span class="comment">///&lt; Timer clocked at T falling edge</span>
<a name="l00142"></a><a class="code" href="group__timer.html#ga22">00142</a> <span class="comment"></span>#define TIMER_CLK_T_RISE        0x07    <span class="comment">///&lt; Timer clocked at T rising edge</span>
<a name="l00143"></a><a class="code" href="group__timer.html#ga23">00143</a> <span class="comment"></span>#define TIMER_PRESCALE_MASK     0x07    <span class="comment">///&lt; Timer Prescaler Bit-Mask</span>
00144 <span class="comment"></span>
<a name="l00145"></a><a class="code" href="group__timer.html#ga24">00145</a> <span class="preprocessor">#define TIMERRTC_CLK_STOP       0x00    </span><span class="comment">///&lt; RTC Timer Stopped</span>
<a name="l00146"></a><a class="code" href="group__timer.html#ga25">00146</a> <span class="comment"></span>#define TIMERRTC_CLK_DIV1       0x01    <span class="comment">///&lt; RTC Timer clocked at F_CPU</span>
<a name="l00147"></a><a class="code" href="group__timer.html#ga26">00147</a> <span class="comment"></span>#define TIMERRTC_CLK_DIV8       0x02    <span class="comment">///&lt; RTC Timer clocked at F_CPU/8</span>
<a name="l00148"></a><a class="code" href="group__timer.html#ga27">00148</a> <span class="comment"></span>#define TIMERRTC_CLK_DIV32      0x03    <span class="comment">///&lt; RTC Timer clocked at F_CPU/32</span>
<a name="l00149"></a><a class="code" href="group__timer.html#ga28">00149</a> <span class="comment"></span>#define TIMERRTC_CLK_DIV64      0x04    <span class="comment">///&lt; RTC Timer clocked at F_CPU/64</span>
<a name="l00150"></a><a class="code" href="group__timer.html#ga29">00150</a> <span class="comment"></span>#define TIMERRTC_CLK_DIV128     0x05    <span class="comment">///&lt; RTC Timer clocked at F_CPU/128</span>
<a name="l00151"></a><a class="code" href="group__timer.html#ga30">00151</a> <span class="comment"></span>#define TIMERRTC_CLK_DIV256     0x06    <span class="comment">///&lt; RTC Timer clocked at F_CPU/256</span>
<a name="l00152"></a><a class="code" href="group__timer.html#ga31">00152</a> <span class="comment"></span>#define TIMERRTC_CLK_DIV1024    0x07    <span class="comment">///&lt; RTC Timer clocked at F_CPU/1024</span>
<a name="l00153"></a><a class="code" href="group__timer.html#ga32">00153</a> <span class="comment"></span>#define TIMERRTC_PRESCALE_MASK  0x07    <span class="comment">///&lt; RTC Timer Prescaler Bit-Mask</span>
00154 <span class="comment"></span>
00155 <span class="comment">// default prescale settings for the timers</span>
00156 <span class="comment">// these settings are applied when you call</span>
00157 <span class="comment">// timerInit or any of the timer&lt;x&gt;Init</span>
<a name="l00158"></a><a class="code" href="group__timer.html#ga33">00158</a> <span class="preprocessor">#define TIMER0PRESCALE      TIMER_CLK_DIV8      </span><span class="comment">///&lt; timer 0 prescaler default</span>
<a name="l00159"></a><a class="code" href="group__timer.html#ga34">00159</a> <span class="comment"></span>#define TIMER1PRESCALE      TIMER_CLK_DIV64     <span class="comment">///&lt; timer 1 prescaler default</span>
<a name="l00160"></a><a class="code" href="group__timer.html#ga35">00160</a> <span class="comment"></span>#define TIMER2PRESCALE      TIMERRTC_CLK_DIV64  <span class="comment">///&lt; timer 2 prescaler default</span>
00161 <span class="comment"></span>
00162 <span class="comment">// interrupt macros for attaching user functions to timer interrupts</span>
00163 <span class="comment">// use these with timerAttach( intNum, function )</span>
00164 <span class="preprocessor">#define TIMER0OVERFLOW_INT          0</span>
00165 <span class="preprocessor"></span><span class="preprocessor">#define TIMER1OVERFLOW_INT          1</span>
00166 <span class="preprocessor"></span><span class="preprocessor">#define TIMER1OUTCOMPAREA_INT       2</span>
00167 <span class="preprocessor"></span><span class="preprocessor">#define TIMER1OUTCOMPAREB_INT       3</span>
00168 <span class="preprocessor"></span><span class="preprocessor">#define TIMER1INPUTCAPTURE_INT      4</span>
00169 <span class="preprocessor"></span><span class="preprocessor">#define TIMER2OVERFLOW_INT          5</span>
00170 <span class="preprocessor"></span><span class="preprocessor">#define TIMER2OUTCOMPARE_INT        6</span>
00171 <span class="preprocessor"></span><span class="preprocessor">#ifdef OCR0 // for processors that support output compare on Timer0</span>
00172 <span class="preprocessor"></span><span class="preprocessor">#define TIMER0OUTCOMPARE_INT        7</span>
00173 <span class="preprocessor"></span><span class="preprocessor">#define TIMER_NUM_INTERRUPTS        8</span>
00174 <span class="preprocessor"></span><span class="preprocessor">#else</span>
00175 <span class="preprocessor"></span><span class="preprocessor">#define TIMER_NUM_INTERRUPTS        7</span>
00176 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00177 <span class="preprocessor"></span>
00178 <span class="comment">// default type of interrupt handler to use for timers</span>
00179 <span class="comment">// *do not change unless you know what you're doing</span>
00180 <span class="comment">// Value may be SIGNAL or INTERRUPT</span>
00181 <span class="preprocessor">#ifndef TIMER_INTERRUPT_HANDLER</span>
00182 <span class="preprocessor"></span><span class="preprocessor">#define TIMER_INTERRUPT_HANDLER     SIGNAL</span>
00183 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00184 <span class="preprocessor"></span>
00185 <span class="comment">// functions</span>
00186 <span class="preprocessor">#define delay       delay_us</span>
00187 <span class="preprocessor"></span><span class="preprocessor">#define delay_ms    timerPause</span>
00188 <span class="preprocessor"></span><span class="keywordtype">void</span> delay_us(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> time_us);
00189 <span class="comment"></span>
00190 <span class="comment">//! initializes timing system (all timers)</span>
00191 <span class="comment"></span><span class="comment">// runs all timer init functions</span>
00192 <span class="comment">// sets all timers to default prescale values #defined in systimer.c</span>
00193 <span class="keywordtype">void</span> <a class="code" href="group__timer.html#ga1">timerInit</a>(<span class="keywordtype">void</span>);
00194 
00195 <span class="comment">// default initialization routines for each timer</span>
00196 <span class="keywordtype">void</span> <a class="code" href="group__timer.html#ga2">timer0Init</a>(<span class="keywordtype">void</span>);      <span class="comment">///&lt; initialize timer0</span>
00197 <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="group__timer.html#ga3">timer1Init</a>(<span class="keywordtype">void</span>);      <span class="comment">///&lt; initialize timer1</span>
00198 <span class="comment"></span><span class="preprocessor">#ifdef TCNT2    // support timer2 only if it exists</span>
00199 <span class="preprocessor"></span><span class="keywordtype">void</span> timer2Init(<span class="keywordtype">void</span>);      <span class="comment">///&lt; initialize timer2</span>
00200 <span class="comment"></span><span class="preprocessor">#endif</span>
00201 <span class="preprocessor"></span>
00202 <span class="comment">// Clock prescaler set/get commands for each timer/counter</span>
00203 <span class="comment">// For setting the prescaler, you should use one of the #defines</span>
00204 <span class="comment">// above like TIMER_CLK_DIVx, where [x] is the division rate</span>
00205 <span class="comment">// you want.</span>
00206 <span class="comment">// When getting the current prescaler setting, the return value</span>
00207 <span class="comment">// will be the [x] division value currently set.</span>
00208 <span class="keywordtype">void</span> <a class="code" href="group__timer.html#ga4">timer0SetPrescaler</a>(u08 prescale);      <span class="comment">///&lt; set timer0 prescaler</span>
00209 <span class="comment"></span>u16  <a class="code" href="group__timer.html#ga5">timer0GetPrescaler</a>(<span class="keywordtype">void</span>);              <span class="comment">///&lt; get timer0 prescaler</span>
00210 <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="group__timer.html#ga6">timer1SetPrescaler</a>(u08 prescale);      <span class="comment">///&lt; set timer1 prescaler</span>
00211 <span class="comment"></span>u16  <a class="code" href="group__timer.html#ga7">timer1GetPrescaler</a>(<span class="keywordtype">void</span>);              <span class="comment">///&lt; get timer0 prescaler</span>