void open_pwm3(void)
{
SYS_UnlockReg();
SYS->P2_MFP |= SYS_MFP_P23_PWM3;
SYS_LockReg();
/*Set Pwm mode*/
_PWM_SET_TIMER_AUTO_RELOAD_MODE(PWMA,PWM_CH3);
/*Set PWM Timer clock prescaler*/
_PWM_SET_TIMER_PRESCALE(PWMA,PWM_CH3,2); // Divided by 2
/*Set PWM Timer clock divider select*/
_PWM_SET_TIMER_CLOCK_DIV(PWMA,PWM_CH3,PWM_CSR_DIV16);
PWMA->CMR3 = Brightness[19];
/*Set PWM Timer period*/
PWMA->CNR3 = 0xffff;
/* Enable PWM Output pin */
_PWM_ENABLE_PWM_OUT(PWMA,PWM_CH3);
/* Enable Timer period Interrupt */
_PWM_ENABLE_TIMER_PERIOD_INT(PWMA,PWM_CH3);
/* Enable PWMB NVIC */
NVIC_EnableIRQ((IRQn_Type)(PWMA_IRQn));
/* Enable PWM Timer */
_PWM_ENABLE_TIMER(PWMA,PWM_CH3);
}
void EXPWM_Init(expwmtype *data)
{
PWM_T *PWM_MODULE = (PWM_T *)(data->Chanell < 4 ? PWMA : PWMB);
unsigned char Chanell = data->Chanell;
if(Chanell > 3)
{
Chanell -= 4;
}
if((data->Chanell == 0 || data->Chanell == 1) && !_expwm_pwm01_isinit)
{
SYSCLK->APBCLK |= SYSCLK_APBCLK_PWM01_EN_Msk;
SYSCLK->CLKSEL1 &= ~SYSCLK_CLKSEL1_PWM01_S_Msk;
SYSCLK->CLKSEL1 |= SYSCLK_CLKSEL1_PWM01_HCLK;
_expwm_pwm01_isinit = 1;
}
if((data->Chanell == 2 || data->Chanell == 3) && !_expwm_pwm23_isinit)
{
SYSCLK->APBCLK |= SYSCLK_APBCLK_PWM23_EN_Msk;
SYSCLK->CLKSEL1 &= ~SYSCLK_CLKSEL1_PWM23_S_Msk;
SYSCLK->CLKSEL1 |= SYSCLK_CLKSEL1_PWM23_HCLK;
_expwm_pwm23_isinit = 1;
}
if((data->Chanell == 4 || data->Chanell == 5) && !_expwm_pwm45_isinit)
{
SYSCLK->APBCLK |= SYSCLK_APBCLK_PWM45_EN_Msk;
SYSCLK->CLKSEL2 &= ~SYSCLK_CLKSEL2_PWM45_S_Msk;
SYSCLK->CLKSEL2 |= SYSCLK_CLKSEL2_PWM45_HCLK;
_expwm_pwm45_isinit = 1;
}
if((data->Chanell == 6 || data->Chanell == 7) && !_expwm_pwm67_isinit)
{
SYSCLK->APBCLK |= SYSCLK_APBCLK_PWM67_EN_Msk;
SYSCLK->CLKSEL2 &= ~SYSCLK_CLKSEL2_PWM67_S_Msk;
SYSCLK->CLKSEL2 |= SYSCLK_CLKSEL2_PWM67_HCLK;
_expwm_pwm67_isinit = 1;
}
if(data->Chanell < 4)
{
// Initialize module a interrupt
if(!_expwm_pwma_isinit)
{
NVIC_EnableIRQ(PWMA_IRQn);
_expwm_pwma_isinit = 1;
}
}
else
{
// Initialize module b interrupt
if(!_expwm_pwmb_isinit)
{
NVIC_EnableIRQ(PWMB_IRQn);
_expwm_pwmb_isinit = 1;
}
}
_PWM_SET_TIMER_AUTO_RELOAD_MODE(PWM_MODULE,Chanell);
_PWM_SET_TIMER_PRESCALE(PWM_MODULE,Chanell, data->Prescaler);
_PWM_SET_TIMER_CLOCK_DIV(PWM_MODULE,Chanell,data->Divider);
_PWM_SET_PWM_COMP_VALUE(PWM_MODULE,Chanell,data->Duty);
_PWM_SET_TIMER_LOADED_VALUE(PWM_MODULE,Chanell,data->Period);
_PWM_ENABLE_PWM_OUT(PWM_MODULE,Chanell);
switch(data->Port)
{
case EXPWM_PORT2:
SYS->P2_MFP |= 0x1UL << (data->Chanell + 8);
break;
case EXPWM_PORT4:
SYS->P4_MFP |= 0x1UL << data->Chanell;
break;
default:
break;
}
if(data->Callback != 0)
{
_PWM_ENABLE_TIMER_PERIOD_INT(PWM_MODULE, Chanell);
_expwm_callback_arr[data->Chanell] = data->Callback;
}
_PWM_ENABLE_TIMER(PWM_MODULE, Chanell);
}
void open_pwm(char channel)
{
/* Assume PWM output frequency is 523Hz and duty ratio is 60%, 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 = __XTAL = 12000000
(CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency
= 12000000/2/1/523 = 11472
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 11471
duty ratio = 60% ==> (CMR+1)/(CNR+1) = 60% ==> CMR = (CNR+1)*0.6-1 = 11472*60/100-1
CMR = 6882
Prescale value is 1 : prescaler= 2
Clock divider is PWM_CSR_DIV1 : clock divider =1
*/
char pwm_channel;
if(channel==0)
{
pwm_channel=PWM_CH0;
SYS_UnlockReg();
SYS->P2_MFP |= SYS_MFP_P20_PWM0;
SYS_LockReg();
}
else
{
pwm_channel=PWM_CH1;
SYS_UnlockReg();
SYS->P2_MFP |= SYS_MFP_P21_PWM1;
SYS_LockReg();
}
/*Set Pwm mode*/
_PWM_SET_TIMER_AUTO_RELOAD_MODE(PWMA,pwm_channel);
/*Set PWM Timer clock prescaler*/
_PWM_SET_TIMER_PRESCALE(PWMA,pwm_channel,1); // Divided by 2
/*Set PWM Timer clock divider select*/
_PWM_SET_TIMER_CLOCK_DIV(PWMA,pwm_channel,PWM_CSR_DIV1);
if(pwm_channel==PWM_CH0)
{
/*Set PWM Timer duty*/
//PWMA->CMR0 = g_au16ScaleCmr[0];
PWMA->CMR0 = 0;
/*Set PWM Timer period*/
PWMA->CNR0 = 0xffff;
}
else
{
/*Set PWM Timer duty*/
PWMA->CMR1 = 0;
//PWMA->CMR1 = Brightness[19];
/*Set PWM Timer period*/
PWMA->CNR1 = 0xffff;
}
/* Enable PWM Output pin */
_PWM_ENABLE_PWM_OUT(PWMA,pwm_channel);
/* Enable Timer period Interrupt */
_PWM_ENABLE_TIMER_PERIOD_INT(PWMA,pwm_channel);
/* Enable PWMB NVIC */
NVIC_EnableIRQ((IRQn_Type)(PWMA_IRQn));
/* Enable PWM Timer */
_PWM_ENABLE_TIMER(PWMA,pwm_channel);
}
/*---------------------------------------------------------------------------------------------------------*/
int32_t main (void)
{
uint8_t u8Item;
int32_t i32Loop = 1;
int32_t i32TestLoop = 1;
/* Init System, IP clock and multi-function I/O */
SYS_Init(); //In the end of SYS_Init() will issue SYS_LockReg() to lock protected register. If user want to write protected register, please issue SYS_UnlockReg() to unlock protected register.
/* 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 0 to drive Buzzer or use PWMB channel 2 to capture\n the signal from PWMB channel 1.\n");
printf(" I/O configuration:\n");
printf(" PWM4(P2.4 PWMB channel 0) <--> Buzzer\n");
printf(" PWM5(P2.5 PWMB channel 1) <--> PWM6(P2.6 PWMB channel 2)\n\n");
while (i32Loop)
{
printf("\n Please Select Test Item\n");
printf(" 0 : Exit\n");
printf(" 1 : PWM Timer Waveform Test.\n");
printf(" 2 : PWM Caputre Test\n");
u8Item = getchar();
switch (u8Item)
{
case '0':
{
i32Loop = 0;
break;
}
case '1':
{
uint8_t u8ItemOK;
printf("\nPWM Timer Waveform Test. Waveform output(P2.4 PWMB channel 0) to Buzzer\n");
/* P2.4 PWMB channel 0 generates PWM frequency Do - Si */
i32TestLoop = 1;
printf("Select Test Item\n");
printf(" 1: Do (523Hz)Tenor C\n");
printf(" 2: Re (587Hz)\n");
printf(" 3: Mi (659Hz)\n");
printf(" 4: Fa (698Hz)\n");
printf(" 5: Sol(784Hz) \n");
printf(" 6: La (880Hz)\n");
printf(" 7: Si (988Hz)\n");
printf(" 0: Exit\n");
while (i32TestLoop)
{
u8ItemOK = 1;
u8Item = getchar();
switch (u8Item)
{
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
g_u16Frequency = g_au16ScaleFreq[(u8Item-'1')];
break;
case '0':
i32TestLoop = 0;
break;
default:
u8ItemOK = 0;
break;
}
if (i32TestLoop && u8ItemOK)
{
g_u32Pulse = 0;
g_u8PWMCount = 1;
/* Assume PWM output frequency is 523Hz and duty ratio is 60%, 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 = __XTAL = 12000000
(CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency
= 12000000/2/1/523 = 11472
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 11471
duty ratio = 60% ==> (CMR+1)/(CNR+1) = 60% ==> CMR = (CNR+1)*0.6-1 = 11472*60/100-1
CMR = 6882
Prescale value is 1 : prescaler= 2
Clock divider is PWM_CSR_DIV1 : clock divider =1
*/
/*Set Pwm mode*/
_PWM_SET_TIMER_AUTO_RELOAD_MODE(PWMB,PWM_CH0);
/*Set PWM Timer clock prescaler*/
_PWM_SET_TIMER_PRESCALE(PWMB,PWM_CH0, 1); // Divided by 2
/*Set PWM Timer clock divider select*/
_PWM_SET_TIMER_CLOCK_DIV(PWMB,PWM_CH0,PWM_CSR_DIV1);
/*Set PWM Timer duty*/
PWMB->CMR0 = g_au16ScaleCmr[(u8Item-'1')];
/*Set PWM Timer period*/
PWMB->CNR0 = g_au16ScaleCnr[(u8Item-'1')];
/* Enable PWM Output pin */
_PWM_ENABLE_PWM_OUT(PWMB, PWM_CH0);
/* Enable Timer period Interrupt */
_PWM_ENABLE_TIMER_PERIOD_INT(PWMB, PWM_CH0);
/* Enable PWMB NVIC */
NVIC_EnableIRQ((IRQn_Type)(PWMB_IRQn));
/* Enable PWM Timer */
_PWM_ENABLE_TIMER(PWMB, PWM_CH0);
while (g_u8PWMCount);
/*--------------------------------------------------------------------------------------*/
/* Stop PWM Timer (Recommended procedure method 2) */
/* Set PWM Timer counter as 0, When interrupt request happen, disable PWM Timer */
/* Set PWM Timer counter as 0 in Call back function */
/*--------------------------------------------------------------------------------------*/
/* Disable PWMB NVIC */
NVIC_DisableIRQ((IRQn_Type)(PWMB_IRQn));
/* Wait until PWMB channel 0 Timer Stop */
while(PWMB->PDR0!=0);
/* Disable the PWM Timer */
_PWM_DISABLE_TIMER(PWMB, PWM_CH0);
/* Disable PWM Output pin */
_PWM_DISABLE_PWM_OUT(PWMB, PWM_CH0);
}
}
break;
}
case '2':
{
printf("PWM Capture Test\n");
printf("Use PWMB Channel 2(P2.6) to capture the PWMB Channel 1(P2.5) Waveform\n");
/*--------------------------------------------------------------------------------------*/
/* 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 = __XTAL = 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 Pwm mode*/
_PWM_SET_TIMER_AUTO_RELOAD_MODE(PWMB,PWM_CH1);
/*Set PWM Timer clock prescaler*/
_PWM_SET_TIMER_PRESCALE(PWMB,PWM_CH1, 1); // Divided by 2
/*Set PWM Timer clock divider select*/
_PWM_SET_TIMER_CLOCK_DIV(PWMB,PWM_CH1,PWM_CSR_DIV1);
/*Set PWM Timer duty*/
PWMB->CMR1 = 7199;
/*Set PWM Timer period*/
PWMB->CNR1 = 23999;
/* Enable PWM Output path for PWMB channel 1 */
_PWM_ENABLE_PWM_OUT(PWMB, PWM_CH1);
/* Enable Timer for PWMB channel 1 */
_PWM_ENABLE_TIMER(PWMB, PWM_CH1);
/*--------------------------------------------------------------------------------------*/
/* 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 = __XTAL = 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 Pwm mode*/
_PWM_SET_TIMER_AUTO_RELOAD_MODE(PWMB,PWM_CH2);
/*Set PWM Timer clock prescaler*/
_PWM_SET_TIMER_PRESCALE(PWMB,PWM_CH2, 1); // Divided by 2
/*Set PWM Timer clock divider select*/
_PWM_SET_TIMER_CLOCK_DIV(PWMB,PWM_CH2,PWM_CSR_DIV1);
/*Set PWM Timer loaded value*/
PWMB->CNR2 = 0xFFFF;
/* Enable capture falling edge interrupt for PWMB channel 2 */
_PWM_ENABLE_CAP_FALLING_INT(PWMB, PWM_CH2);
/* Enable PWMB NVIC interrupt */
NVIC_EnableIRQ((IRQn_Type)(PWMB_IRQn));
/* Enable Capture Function for PWMB channel 2 */
_PWM_ENABLE_CAP_FUNC(PWMB, PWM_CH2);
/* Enable Timer for PWMB channel 2 */
_PWM_ENABLE_TIMER(PWMB, PWM_CH2);
/* Wait until PWMB channel 2 Timer start to count */
while(PWMB->PDR2==0);
/* Enable capture input path for PWMB channel 2 */
_PWM_ENABLE_CAP_IN(PWMB, PWM_CH2);
/* 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 */
PWMB->CNR1 =0;
/* Wait until PWMB channel 1 Timer Stop */
while(PWMB->PDR1!=0);
/* Disable Timer for PWMB channel 1 */
_PWM_DISABLE_TIMER(PWMB, PWM_CH1);
/* Disable PWM Output path for PWMB channel 1 */
_PWM_DISABLE_PWM_OUT(PWMB, PWM_CH1);
/*------------------------------------------------------------------------------------------------------*/
/* 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 */
PWMB->CNR2 =0;
/* Wait until PWMB channel 2 current counter reach to 0 */
while(PWMB->PDR2!=0);
/* Disable Timer for PWMB channel 2 */
_PWM_DISABLE_TIMER(PWMB, PWM_CH2);
/* Disable Capture Function for PWMB channel 2*/
_PWM_DISABLE_CAP_FUNC(PWMB, PWM_CH2);
/* Clear Capture Interrupt flag for PWMB channel 2*/
_PWM_CLR_CAP_INT_FLAG(PWMB, PWM_CH2);
/* Disable Capture Input path for PWMB channel 2 */
_PWM_DISABLE_CAP_IN(PWMB, PWM_CH2);
break;
}
}
}
printf("PWM sample is complete.\n");
/* Disable PWMB clock engine */
SYSCLK->APBCLK&=(~(SYSCLK_APBCLK_PWM45_EN_Msk|SYSCLK_APBCLK_PWM67_EN_Msk));
return 0;
}