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| <h1 id="cpu-time">CPU Time</h1> |
| <p>The MyNewt <code>cputime</code> module provides high resolution time and timer support. </p> |
| <h2 id="description">Description</h2> |
| <p>The <code>cputime</code> API provides high resolution time and timer support. The module must be initialized, using the <code>os_cputime_init()</code> function, with the clock frequency to use. The module uses the <code>hal_timer</code> API, defined in hal/hal_timer.h, to access the hardware timers. It uses the hardware timer number specified by the <code>OS_CPUTIME_TIMER_NUM</code> system configuration setting.</p> |
| <h2 id="data-structures">Data Structures</h2> |
| <p>The module uses the following data structures:</p> |
| <ul> |
| <li><code>uint32_t</code> to represent <code>cputime</code>. Only the lower 32 bits of a 64 timer are used. </li> |
| <li><code>struct hal_timer</code> to represent a cputime timer.</li> |
| </ul> |
| <h2 id="list-of-functions">List of Functions</h2> |
| <p>The functions available in cputime are:</p> |
| <table> |
| <thead> |
| <tr> |
| <th><strong>Function</strong></th> |
| <th><strong>Description</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a href="../os_cputime_delay_nsecs/">os_cputime_delay_nsecs</a></td> |
| <td>Delays for a specified number of nanoseconds.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_delay_ticks/">os_cputime_delay_ticks</a></td> |
| <td>Delays for a specified number of ticks.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_delay_usecs/">os_cputime_delay_usecs</a></td> |
| <td>Delays for a specified number of microseconds.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_get32/">os_cputime_get32</a></td> |
| <td>Gets the current value of the cpu time.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_init/">os_cputime_init</a></td> |
| <td>Initializes the cputime module.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_nsecs_to_ticks/">os_cputime_nsecs_to_ticks</a></td> |
| <td>Converts the specified number of nanoseconds to number of ticks.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_ticks_to_nsecs/">os_cputime_ticks_to_nsecs</a></td> |
| <td>Converts the specified number of ticks to number of nanoseconds.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_ticks_to_usecs/">os_cputime_ticks_to_usecs</a></td> |
| <td>Converts the specified number of ticks to number of microseconds.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_timer_init/">os_cputime_timer_init</a></td> |
| <td>Initializes a timer.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_timer_relative/">os_cputime_timer_relative</a></td> |
| <td>Sets a timer to expire in the specified number of microseconds from the current time.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_timer_start/">os_cputime_timer_start</a></td> |
| <td>Sets a timer to expire at the specified cputime.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_timer_stop/">os_cputime_timer_stop</a></td> |
| <td>Stops a timer from running.</td> |
| </tr> |
| <tr> |
| <td><a href="../os_cputime_usecs_to_ticks/">os_cputime_usecs_to_ticks</a></td> |
| <td>Converts the specified number of microseconds to number of ticks.</td> |
| </tr> |
| </tbody> |
| </table> |
| <h2 id="list-of-macros">List of Macros</h2> |
| <p>These macros should be used to evaluate the time with respect to each other.</p> |
| <ul> |
| <li><code>CPUIME_LT(t1,t2)</code> -- evaluates to true if t1 is before t2 in time.</li> |
| <li><code>CPUTIME_GT(t1,t2)</code> -- evaluates to true if t1 is after t2 in time </li> |
| <li><code>CPUTIME_LEQ(t1,t2)</code> -- evaluates to true if t1 is on or before t2 in time.</li> |
| <li><code>CPUTIME_GEQ(t1,t2)</code> -- evaluates to true if t1 is on or after t2 in time.</li> |
| </ul> |
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