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106 lines
2.5 KiB
106 lines
2.5 KiB
#include "system_func.h"
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static volatile uint8_t usTickCountDiv;
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static volatile uint32_t msTickCount;
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static void SystemTimerInitialization(void);
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static void SystemTimer_Interrput_Handler(void);
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static uint32_t SystemTimer_GetPeriodCount(uint32_t prescalar, uint32_t frequency);
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void SystemCoreClockSet(SYSTEM_CORE_CLOCK_LIST clock)
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{
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switch(clock)
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{
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case HIRC_96MHZ:
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usTickCountDiv = 48;
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LP_SetOperatingVoltage(LP_OVR_1_1);
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break;
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case HIRC_48MHZ:
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usTickCountDiv = 24;
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LP_SetOperatingVoltage(LP_OVR_1_0);
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break;
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case HIRC_24MHZ:
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usTickCountDiv = 12;
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LP_SetOperatingVoltage(LP_OVR_0_9);
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break;
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default:
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usTickCountDiv = 48;
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LP_SetOperatingVoltage(LP_OVR_1_1);
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break;;
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}
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SystemTimerInitialization();
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}
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uint32_t SystemTimer_Get_TickCount(void)
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{
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return msTickCount;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////
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static void SystemTimerInitialization(void)
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{
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// Declare variables
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tmr_cfg_t tmr;
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int tmr_id = MXC_TMR_GET_IDX(SYSTEM_TIMER_INSTANCE);
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uint32_t periodTicks = SystemTimer_GetPeriodCount(1, 1000);
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/*
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Steps for configuring a timer for PWM mode:
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1. Disable the timer
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2. Set the prescale value
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3 Configure the timer for continuous mode
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4. Set polarity, timer parameters
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5. Enable Timer
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*/
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TMR_Disable(SYSTEM_TIMER_INSTANCE);
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TMR_Init(SYSTEM_TIMER_INSTANCE, TMR_PRES_1, 0);
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tmr.mode = TMR_MODE_CONTINUOUS;
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tmr.cmp_cnt = (periodTicks - 1);
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tmr.pol = 0;
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TMR_Config(SYSTEM_TIMER_INSTANCE, &tmr);
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if(tmr_id == 0){
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NVIC_SetVector(TMR0_IRQn, SystemTimer_Interrput_Handler);
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NVIC_EnableIRQ(TMR0_IRQn);
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}
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else if(tmr_id == 1)
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{
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NVIC_SetVector(TMR1_IRQn, SystemTimer_Interrput_Handler);
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NVIC_EnableIRQ(TMR1_IRQn);
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}
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else if(tmr_id == 2)
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{
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NVIC_SetVector(TMR2_IRQn, SystemTimer_Interrput_Handler);
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NVIC_EnableIRQ(TMR2_IRQn);
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}
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msTickCount = 0;
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TMR_Enable(SYSTEM_TIMER_INSTANCE);
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}
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static void SystemTimer_Interrput_Handler(void)
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{
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TMR_IntClear(SYSTEM_TIMER_INSTANCE);
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msTickCount++;
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}
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static uint32_t SystemTimer_GetPeriodCount(uint32_t prescalar, uint32_t frequency)
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{
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uint32_t retVal, clkFreq;
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clkFreq = PeripheralClock;
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retVal = clkFreq / (prescalar * frequency);
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return retVal;
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}
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