/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
printf("+------------------------------------------------------------------------+\n");
printf("| PWM Driver Sample Code |\n");
printf("| |\n");
printf("+------------------------------------------------------------------------+\n");
printf(" This sample code will use PWMB channel 2 to capture\n the signal from PWMB channel 1.\n");
printf(" I/O configuration:\n");
printf(" PWM5(P2.5 PWMB channel 1) <--> PWM6(P2.6 PWMB channel 2)\n\n");
printf("Use PWMB Channel 2(P2.6) to capture the PWMB Channel 1(P2.5) Waveform\n");
while(1)
{
printf("Press any key to start PWM Capture Test\n");
getchar();
/*--------------------------------------------------------------------------------------*/
/* Set the PWMB Channel 1 as PWM output function. */
/*--------------------------------------------------------------------------------------*/
/* Assume PWM output frequency is 250Hz and duty ratio is 30%, user can calculate PWM settings by follows.
duty ratio = (CMR+1)/(CNR+1)
cycle time = CNR+1
High level = CMR+1
PWM clock source frequency = __HXT = 12000000
(CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency
= 12000000/2/1/250 = 24000
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 23999
duty ratio = 30% ==> (CMR+1)/(CNR+1) = 30%
CMR = 7199
Prescale value is 1 : prescaler= 2
Clock divider is PWM_CSR_DIV1 : clock divider =1
*/
/* set PWMB channel 1 output configuration */
PWM_ConfigOutputChannel(PWMB, PWM_CH1, 250, 30);
/* Enable PWM Output path for PWMB channel 1 */
PWM_EnableOutput(PWMB, 0x2);
/* Enable Timer for PWMB channel 1 */
PWM_Start(PWMB, 0x2);
/*--------------------------------------------------------------------------------------*/
/* Set the PWMB channel 2 for capture function */
/*--------------------------------------------------------------------------------------*/
/* If input minimum frequency is 250Hz, user can calculate capture settings by follows.
Capture clock source frequency = __HXT = 12000000 in the sample code.
(CNR+1) = Capture clock source frequency/prescaler/clock source divider/minimum input frequency
= 12000000/2/1/250 = 24000
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 0xFFFF
(Note: In capture mode, user should set CNR to 0xFFFF to increase capture frequency range.)
*/
/* set PWMB channel 2 capture configuration */
PWM_ConfigCaptureChannel(PWMB, PWM_CH2, 166, 0);
/* Enable capture falling edge interrupt for PWMB channel 2 */
PWM_EnableCaptureInt(PWMB, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);
/* Enable PWMB NVIC interrupt */
NVIC_EnableIRQ((IRQn_Type)(PWMB_IRQn));
/* Enable Timer for PWMB channel 2 */
PWM_Start(PWMB, 0x4);
/* Enable Capture Function for PWMB channel 2 */
PWM_EnableCapture(PWMB, 0x4);
/* Wait until PWMB channel 2 Timer start to count */
while(PWMB->PDR2 == 0);
/* Capture the Input Waveform Data */
CalPeriodTime(PWMB, PWM_CH2);
/*------------------------------------------------------------------------------------------------------*/
/* Stop PWMB channel 1 (Recommended procedure method 1) */
/* Set PWM Timer loaded value(CNR) as 0. When PWM internal counter(PDR) reaches to 0, disable PWM Timer */
/*------------------------------------------------------------------------------------------------------*/
/* Set PWMB channel 1 loaded value as 0 */
PWM_Stop(PWMB, 0x2);
/* Wait until PWMB channel 1 Timer Stop */
while(PWMB->PDR1 != 0);
/* Disable Timer for PWMB channel 1 */
PWM_ForceStop(PWMB, 0x2);
/* Disable PWM Output path for PWMB channel 1 */
PWM_DisableOutput(PWMB, 0x2);
/*------------------------------------------------------------------------------------------------------*/
/* Stop PWMB channel 2 (Recommended procedure method 1) */
/* Set PWM Timer loaded value(CNR) as 0. When PWM internal counter(PDR) reaches to 0, disable PWM Timer */
/*------------------------------------------------------------------------------------------------------*/
/* Disable PWMB NVIC */
NVIC_DisableIRQ((IRQn_Type)(PWMB_IRQn));
/* Set loaded value as 0 for PWMB channel 2 */
PWM_Stop(PWMB, 0x4);
/* Wait until PWMB channel 2 current counter reach to 0 */
while(PWMB->PDR2 != 0);
/* Disable Timer for PWMB channel 2 */
PWM_ForceStop(PWMB, 0x4);
/* Disable Capture Function and Capture Input path for PWMB channel 2*/
PWM_DisableCapture(PWMB, 0x4);
/* Clear Capture Interrupt flag for PWMB channel 2*/
PWM_ClearCaptureIntFlag(PWMB, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);
}
}
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
printf("+------------------------------------------------------------------------+\n");
printf("| PWM Driver Sample Code |\n");
printf("| |\n");
printf("+------------------------------------------------------------------------+\n");
printf(" This sample code will use PWM0 channel 0 to capture\n the signal from PWM1 channel 0.\n");
printf(" I/O configuration:\n");
printf(" PWM0_CH0(PA.12 PWM0 channel 0) <--> PWM1_CH0(PA.2 PWM1 channel 0)\n\n");
printf("Use PWM0 Channel 0(PA.12) to capture the PWM1 Channel 0(PA.2) Waveform\n");
while(1)
{
printf("Press any key to start PWM Capture Test\n");
getchar();
/*--------------------------------------------------------------------------------------*/
/* Set the PWM1 Channel 0 as PWM output function. */
/*--------------------------------------------------------------------------------------*/
/* Assume PWM output frequency is 250Hz and duty ratio is 30%, user can calculate PWM settings by follows.
duty ratio = (CMR+1)/(CNR+1)
cycle time = CNR+1
High level = CMR+1
PWM clock source frequency = __HXT = 12000000
(CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency
= 12000000/2/1/250 = 24000
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 23999
duty ratio = 30% ==> (CMR+1)/(CNR+1) = 30%
CMR = 7199
Prescale value is 1 : prescaler= 2
Clock divider is PWM_CSR_DIV1 : clock divider =1
*/
/* set PWM1 channel 0 output configuration */
PWM_ConfigOutputChannel(PWM1, 0, 250, 30);
/* Enable PWM Output path for PWM1 channel 0 */
PWM_EnableOutput(PWM1, PWM_CH_0_MASK);
/* Enable Timer for PWM1 channel 0 */
PWM_Start(PWM1, PWM_CH_0_MASK);
/*--------------------------------------------------------------------------------------*/
/* Set the PWM0 channel 0 for capture function */
/*--------------------------------------------------------------------------------------*/
/* If input minimum frequency is 250Hz, user can calculate capture settings by follows.
Capture clock source frequency = __HXT = 12000000 in the sample code.
(CNR+1) = Capture clock source frequency/prescaler/clock source divider/minimum input frequency
= 12000000/2/1/250 = 24000
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 0xFFFF
(Note: In capture mode, user should set CNR to 0xFFFF to increase capture frequency range.)
*/
/* set PWM0 channel 0 capture configuration */
PWM_ConfigCaptureChannel(PWM0, 0, 166, 0);
/* Enable capture falling edge interrupt for PWM0 channel 0 */
//PWM_EnableCaptureInt(PWM0, 0, PWM_CAPTURE_INT_FALLING_LATCH);
/* Enable PWM0 NVIC interrupt */
//NVIC_EnableIRQ(PWM0_IRQn);
/* Enable Timer for PWM0 channel 0 */
PWM_Start(PWM0, PWM_CH_0_MASK);
/* Enable Capture Function for PWM0 channel 0 */
PWM_EnableCapture(PWM0, PWM_CH_0_MASK);
/* Enable falling capture reload */
PWM0->CAPCTL |= PWM_CAPCTL_FCRLDEN0_Msk;
/* Wait until PWM0 channel 0 Timer start to count */
while((PWM0->CNT[0]) == 0);
/* Capture the Input Waveform Data */
CalPeriodTime(PWM0, 0);
/*---------------------------------------------------------------------------------------------------------*/
/* Stop PWM1 channel 0 (Recommended procedure method 1) */
/* Set PWM Timer loaded value(Period) as 0. When PWM internal counter(CNT) reaches to 0, disable PWM Timer */
/*---------------------------------------------------------------------------------------------------------*/
/* Set PWM1 channel 0 loaded value as 0 */
PWM_Stop(PWM1, PWM_CH_0_MASK);
/* Wait until PWM1 channel 0 Timer Stop */
while((PWM1->CNT[0] & PWM_CNT_CNT_Msk) != 0);
/* Disable Timer for PWM1 channel 0 */
PWM_ForceStop(PWM1, PWM_CH_0_MASK);
/* Disable PWM Output path for PWM1 channel 0 */
PWM_DisableOutput(PWM1, PWM_CH_0_MASK);
/*---------------------------------------------------------------------------------------------------------*/
/* Stop PWM0 channel 0 (Recommended procedure method 1) */
/* Set PWM Timer loaded value(Period) as 0. When PWM internal counter(CNT) reaches to 0, disable PWM Timer */
/*---------------------------------------------------------------------------------------------------------*/
/* Disable PWM0 NVIC */
//NVIC_DisableIRQ(PWM0_IRQn);
/* Set loaded value as 0 for PWM0 channel 0 */
PWM_Stop(PWM0, PWM_CH_0_MASK);
/* Wait until PWM0 channel 0 current counter reach to 0 */
while((PWM0->CNT[0] & PWM_CNT_CNT_Msk) != 0);
/* Disable Timer for PWM0 channel 0 */
PWM_ForceStop(PWM0, PWM_CH_0_MASK);
/* Disable Capture Function and Capture Input path for PWM0 channel 0 */
PWM_DisableCapture(PWM0, PWM_CH_0_MASK);
/* Clear Capture Interrupt flag for PWM0 channel 0 */
PWM_ClearCaptureIntFlag(PWM0, 0, PWM_CAPTURE_INT_FALLING_LATCH);
}
}
