/* *****************************************************************************
 * gpt1_timer.c
 *
 * Create and manage GPT1 timer
 *      free running 32 bit GPT timer
 *      input = 24 MHz / 24 = 1.0 MHz
 *      rollover: ~ 4295 seconds = ~ 71 minutes
 *      resolution: 1 count = 1.000 micro seconds
 *
 *      1 second        = 1,000,000 counts
 *      0.1 second      = 100,000
 *      0.01 seccond    = 10,000
 *      1 millisecond   = 1,000
 */

#include "fsl_common.h"
#include "fsl_gpt.h"
#include "gpt1_timer.h"

void gpt1_init(void)
{
    gpt_config_t gpt1Config;

    GPT_GetDefaultConfig(&gpt1Config);
//     The default values are:
//       config.clockSource = kGPT_ClockSource_Periph;
//       config.divider = 1U;
//       config.enableRunInStop = true;
//       config.enableRunInWait = true;
//       config.enableRunInDoze = false;
//       config.enableRunInDbg = false;
//       config.enableFreeRun = false;
//       config.enableMode  = true;

    GPT_Init(GPT1, &gpt1Config);                    // Set config to defaults
    GPT_SetClockSource(GPT1, kGPT_ClockSource_Osc); // 24 MHz
    GPT_SetClockDivider(GPT1, 24);                  // Prescaler = 24

    gpt1Config.enableFreeRun = true;                // Free run
    gpt1Config.enableMode  = false;                 // No reset of counter

    GPT_StartTimer(GPT1);                           // Start Timer
}

uint32_t us_count(void)
{
    return GPT_GetCurrentTimerCount(GPT1);
}


// EoF =====-----