/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V1.00
* $Revision: 4 $
* $Date: 15/05/22 2:05p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Generate different frequency(Tenor C Do ~ Si) waveform by PWM.
*
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "M051Series.h"
/*---------------------------------------------------------------------------------------------------------*/
/* Macro, type and constant definitions */
/*---------------------------------------------------------------------------------------------------------*/
#define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK 50000000
// Scale frequency and unit is Hz
#define TENOR_C 523
#define TENOR_D 587
#define TENOR_E 659
#define TENOR_F 698
#define TENOR_G 784
#define TENOR_A 880
#define TENOR_B 988
void PWM_PwmIRQHandler(void);
/*---------------------------------------------------------------------------------------------------------*/
/* Global variables */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint8_t g_u8PWMCount = 1;
volatile uint16_t g_u16Frequency;
volatile uint32_t g_u32Pulse = 0;
/* Assume PWM output frequency is 523Hz and duty ratio is 60%, user can calculate PWM settings by follows.
PWM clock source frequency = __HXT = 12000000 in the sample code.
(CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency
= 12000000/2/1/523 = 11472 < 65536 (Note: If calculated value is larger than 65536, user should increase prescale value.)
CNR = 11471 =>g_au16ScaleCnr[0] = 11471
duty ratio = 60% = (CMR+1)/(CNR+1) ==> CMR = (CNR+1)*60/100-1 = 11472*60/100-1
CMR = 6882 =>g_au16ScaleCmr[0] = 6882
*/
static const uint16_t g_au16ScaleFreq[7] = {TENOR_C, TENOR_D, TENOR_E, TENOR_F, TENOR_G, TENOR_A, TENOR_B};
// static const uint16_t g_au16ScaleCnr[7] = {11471,10220,9103,8594,7652,6817,6071};
// static const uint16_t g_au16ScaleCmr[7] = {6882 ,6131 ,5461,5156,4590,4089,3642};
/**
* @brief PWMA IRQ Handler
*
* @param None
*
* [url=home.php?mod=space&uid=266161]@return[/url] None
*
* [url=home.php?mod=space&uid=1543424]@Details[/url] ISR to handle PWMA interrupt event
*/
void PWMA_IRQHandler(void)
{
uint32_t u32PwmIntFlag;
/* Handle PWMA Timer function */
u32PwmIntFlag = PWMA->PIIR;
/* PWMB channel 0 PWM timer interrupt */
if(u32PwmIntFlag & PWM_PIIR_PWMIF0_Msk)
{
PWMA->PIIR = PWM_PIIR_PWMIF0_Msk;
PWM_PwmIRQHandler();
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* PWM Timer function */
/*---------------------------------------------------------------------------------------------------------*/
void PWM_PwmIRQHandler(void)
{
if(g_u32Pulse == 1 * g_u16Frequency / 10)
{
/*--------------------------------------------------------------------------------------*/
/* Stop PWMA channel 0 Timer (Recommended procedure method 2) */
/* Set PWM Timer counter as 0, When interrupt request happen, disable PWM Timer */
/*--------------------------------------------------------------------------------------*/
PWMA->CNR0 = 0;
}
if(g_u32Pulse == 1 * g_u16Frequency / 10 + 1)
g_u8PWMCount = 0;
g_u32Pulse++;
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable Internal RC clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for IRC22M clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable external 12MHz XTAL, internal 22.1184MHz */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC22M_EN_Msk);
/* Enable PLL and Set PLL frequency */
CLK_SetCoreClock(PLLCON_SETTING);
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(2));
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Enable PWM module clock */
CLK_EnableModuleClock(PWM01_MODULE);
CLK_EnableModuleClock(PWM23_MODULE);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/* Select PWM module clock source */
CLK_SetModuleClock(PWM01_MODULE, CLK_CLKSEL1_PWM01_S_HXT, 0);
CLK_SetModuleClock(PWM23_MODULE, CLK_CLKSEL1_PWM23_S_HXT, 0);
/* Reset PWMA channel0~channel3 */
SYS_ResetModule(PWM03_RST);
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
//SystemCoreClockUpdate();
PllClock = PLL_CLOCK; // PLL
SystemCoreClock = PLL_CLOCK / 1; // HCLK
CyclesPerUs = PLL_CLOCK / 1000000; // For SYS_SysTickDelay()
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P3 multi-function pins for UART0 RXD and TXD */
SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;
/* Set P4 multi-function pins for PWMA Channel0 */
SYS->P4_MFP = SYS_MFP_P40_PWM0;
}
void UART0_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Configure UART0 and set UART0 Baudrate */
UART_Open(UART0, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* Main Function */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
uint8_t u8Item, u8ItemOK;
/* 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 PWMA channel 0 to drive Buzzer\n");
printf(" I/O configuration:\n");
printf(" PWM0(P4.0 PWMA channel 0) <--> Buzzer\n");
printf("\nPWM Timer Waveform Test. Waveform output(P4.0 PWMA channel 0) to Buzzer\n");
/* P4.0 PWMA channel 0 generates PWM frequency Do - Si */
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");
while(1)
{
u8ItemOK = 1;
u8Item = getchar();
printf("\t");
switch(u8Item)
{
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
g_u16Frequency = g_au16ScaleFreq[(u8Item - '1')];
break;
default:
u8ItemOK = 0;
break;
}
if(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 = __HXT = 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
*/
/* Enable PWM Output pin */
PWM_EnableOutput(PWMA, 0x1);
PWM_ConfigOutputChannel(PWMA, PWM_CH0, g_u16Frequency, 60);
/* Enable Timer period Interrupt */
PWM_EnablePeriodInt(PWMA, PWM_CH0, PWM_PERIOD_INT_UNDERFLOW);
/* Enable PWMB NVIC */
NVIC_EnableIRQ((IRQn_Type)(PWMA_IRQn));
/* Enable PWM Timer */
PWM_Start(PWMA, 0x1);
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)(PWMA_IRQn));
/* Wait until PWMB channel 0 Timer Stop */
while(PWMA->PDR0 != 0);
/* Disable the PWM Timer */
PWM_Stop(PWMA, 0x1);
/* Disable PWM Output pin */
PWM_DisableOutput(PWMA, 0x1);
}
}
}
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