8 应用代码

要更改 TIMER 使用的特定值以及所需的频率范围，请修改文档开头的 #defines，如以下代码块所示：

/* Based on required specifications, vary the value 
 * between PERIOD_10ms, PERIOD_20ms, and PERIOD_50ms 
 * to achieve desired frequency range.
 *
 * RANGES:
 * 10 ms: 100 Hz - 1 MHz
 * 20 ms: 50 Hz - 1 MHz
 * 50 ms: 20 Hz - 1 MHz
 *
 * Please reference [file name] for percent error
 */
#define CAPTURE_PERIOD (PERIOD_20ms) /* CHANGE THIS VARIABLE VALUE */

/* Set the desired frequency range 
 * NOTE: see [file name] to ensure proper capture period is set
 * for desired frequency range
 */
#define LOWERBOUND (2000)
#define UPPERBOUND (10000)

/* The maximum amount of rising edge the Timer Compare
 * will read from the COMP. Used as a limit rather than
 * an actual fix value of counts
 */
#define MAX_COMPARE_COUNT 65000