31 lines
967 B
C
31 lines
967 B
C
#include "led_pwm.h"
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#include "fsl_port.h"
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void LedPwm_Init(void)
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{
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CLOCK_EnableClock(LED_PWM_CLOCK);
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PORT_SetPinMux(LED_PWM_PORT, LED_PWM_PIN, kPORT_MuxAlt2);
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// Select the clock source for the TPM counter as MCGPLLCLK.
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CLOCK_SetTpmClock(1U);
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tpm_config_t tpmInfo;
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TPM_GetDefaultConfig(&tpmInfo);
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TPM_Init(LED_PWM_TPM_BASEADDR, &tpmInfo);
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tpm_chnl_pwm_signal_param_t tpmParam[1];
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tpmParam[0].chnlNumber = LED_PWM_TPM_CHANNEL;
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tpmParam[0].level = kTPM_LowTrue;
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tpmParam[0].dutyCyclePercent = 100 - INITIAL_DUTY_CYCLE_PERCENT;
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TPM_SetupPwm(LED_PWM_TPM_BASEADDR, tpmParam, 1,
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kTPM_EdgeAlignedPwm, TPM_PWM_FREQUENCY, TPM_SOURCE_CLOCK);
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TPM_StartTimer(LED_PWM_TPM_BASEADDR, kTPM_SystemClock);
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}
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void LedPwm_SetBrightness(uint8_t brightnessPercent)
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{
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TPM_UpdatePwmDutycycle(LED_PWM_TPM_BASEADDR, LED_PWM_TPM_CHANNEL,
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kTPM_EdgeAlignedPwm, 100 - brightnessPercent);
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}
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