- /**************************************************************************//**
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V1.00
- * $Revision: 3 $
- * $Date: 14/01/28 11:44a $
- * [url=home.php?mod=space&uid=247401]@brief[/url] NUC029 Series PWM Generator and Capture Timer Driver Sample Code
- *
- * @note
- * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
- *
- ******************************************************************************/
- #include <stdio.h>
- #include "NUC029xAN.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);
- }
- }
- }