90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
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#include "hdl_pwm.h"
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/*unit 0.01us*/
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static void TmrAConfig(uint32_t t)
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{
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stc_clock_freq_t sysFrq;
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CLK_GetClockFreq(&sysFrq);
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uint32_t peroid = 1.0 *sysFrq.u32Pclk1Freq / t;
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stc_tmra_init_t stcTmraInit;
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stc_tmra_pwm_init_t stcPwmInit;
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/* 1. Enable TimerA peripheral clock. */
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FCG_Fcg2PeriphClockCmd(TMRA_PERIPH_CLK, ENABLE);
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/* 2. Set a default initialization value for stcTmraInit. */
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(void)TMRA_StructInit(&stcTmraInit);
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/* 3. Modifies the initialization values depends on the application. */
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stcTmraInit.sw_count.u8CountMode = TMRA_MD;
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stcTmraInit.sw_count.u8CountDir = TMRA_DIR;
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stcTmraInit.u32PeriodValue = (peroid-1);
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(void)TMRA_Init(TMRA_UNIT, &stcTmraInit);
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/* 4. Set the comparison reference value. */
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#if (APP_FUNC == APP_FUNC_NORMAL_SINGLE_PWM)
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(void)TMRA_PWM_StructInit(&stcPwmInit);
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stcPwmInit.u32CompareValue = 0;
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stcPwmInit.u16PeriodMatchPolarity = TMRA_PWM_HIGH;
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GPIO_SetFunc(TMRA_PWM_PORT, TMRA_PWM_PIN, TMRA_PWM_PIN_FUNC);
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(void)TMRA_PWM_Init(TMRA_UNIT, TMRA_PWM_CH, &stcPwmInit);
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TMRA_PWM_OutputCmd(TMRA_UNIT, TMRA_PWM_CH, ENABLE);
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#endif
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}
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void hdl_pwm_init(int frq){
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/* MCU Peripheral registers write unprotected. */
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LL_PERIPH_WE(LL_PERIPH_GPIO | LL_PERIPH_FCG | LL_PERIPH_PWC_CLK_RMU);
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/* Configures TimerA. */
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TmrAConfig( frq);
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/* MCU Peripheral registers write protected. */
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LL_PERIPH_WP(LL_PERIPH_GPIO | LL_PERIPH_FCG | LL_PERIPH_PWC_CLK_RMU);
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}
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void hdl_pwm_enable(void){
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/* Starts TimerA. */
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TMRA_Start(TMRA_UNIT);
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}
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void hdl_pwm_disable(void){
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/* Starts TimerA. */
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TMRA_Stop(TMRA_UNIT);
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}
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void hdl_pwm_set_duty(int duty){
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uint32_t period = TMRA_GetPeriodValue(TMRA_UNIT)+1;
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uint32_t val = duty*0.01*period;
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if(val <1){
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val =1;
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}
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if(val >period){
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val =period;
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}
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TMRA_Stop(TMRA_UNIT);
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TMRA_SetCountValue(TMRA_UNIT,0);
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TMRA_SetCompareValue(TMRA_UNIT,TMRA_PWM_CH,val-1);
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TMRA_Start(TMRA_UNIT);
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}
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