- /**************************************************************************//**
- * [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: 15/02/06 10:22a $
- * [url=home.php?mod=space&uid=247401]@brief[/url] Capture the PWMA Channel 1 waveform by PWMA Channel 2.
- * @note
- * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
- *
- ******************************************************************************/
- #include <stdio.h>
- #include "M058S.h"
- /*---------------------------------------------------------------------------------------------------------*/
- /* Macro, type and constant definitions */
- /*---------------------------------------------------------------------------------------------------------*/
- #define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
- #define PLL_CLOCK 50000000
- /**
- * @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 u32CapIntFlag1;
- /* Handle PWMA Capture function */
- u32CapIntFlag1 = PWMA->CCR2;
- /* PWMA channel 2 Capture interrupt */
- if(u32CapIntFlag1 & PWM_CCR2_CAPIF2_Msk)
- {
- PWMA->CCR2 &= (PWM_CCR_MASK | PWM_CCR2_CAPIF2_Msk);
- }
- }
- /*--------------------------------------------------------------------------------------*/
- /* Capture function to calculate the input waveform information */
- /* u32Count[4] : Keep the internal counter value when input signal rising / falling */
- /* happens */
- /* */
- /* time A B C D */
- /* ___ ___ ___ ___ ___ ___ ___ ___ */
- /* ____| |_| |_| |_| |_| |_| |_| |_| |_____ */
- /* index 0 1 2 3 */
- /* */
- /* The capture internal counter down count from 0x10000, and reload to 0x10000 after */
- /* input signal falling happens (Time B/C/D) */
- /*--------------------------------------------------------------------------------------*/
- void CalPeriodTime(PWM_T *PWM, uint32_t u32Ch)
- {
- uint16_t u32Count[4];
- uint32_t u32i;
- uint16_t u16RisingTime, u16FallingTime, u16HighPeroid, u16LowPeroid, u16TotalPeroid;
- /* Clear Capture Falling Indicator (Time A) */
- PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);
- /* Wait for Capture Falling Indicator */
- while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);
- /* Clear Capture Falling Indicator (Time B)*/
- PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);
- u32i = 0;
- while(u32i < 4)
- {
- /* Wait for Capture Falling Indicator */
- while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);
- /* Clear Capture Falling and Rising Indicator */
- PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH | PWM_CAPTURE_INT_RISING_LATCH);
- /* Get Capture Falling Latch Counter Data */
- u32Count[u32i++] = PWM_GET_CAPTURE_FALLING_DATA(PWM, u32Ch);
- /* Wait for Capture Rising Indicator */
- while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);
- /* Clear Capture Rising Indicator */
- PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_RISING_LATCH);
- /* Get Capture Rising Latch Counter Data */
- u32Count[u32i++] = PWM_GET_CAPTURE_RISING_DATA(PWM, u32Ch);
- }
- u16RisingTime = u32Count[1];
- u16FallingTime = u32Count[0];
- u16HighPeroid = u32Count[1] - u32Count[2];
- u16LowPeroid = 0x10000 - u32Count[1];
- u16TotalPeroid = 0x10000 - u32Count[2];
- printf("\nPWM generate: \nHigh Period=7199 ~ 7201, Low Period=16799 ~ 16801, Total Period=23999 ~ 24001\n");
- printf("\nCapture Result: Rising Time = %d, Falling Time = %d \nHigh Period = %d, Low Period = %d, Total Period = %d.\n\n",
- u16RisingTime, u16FallingTime, u16HighPeroid, u16LowPeroid, u16TotalPeroid);
- if((u16HighPeroid < 7199) || (u16HighPeroid > 7201) || (u16LowPeroid < 16799) || (u16LowPeroid > 16801) || (u16TotalPeroid < 23999) || (u16TotalPeroid > 24001))
- printf("Capture Test Fail!!\n");
- else
- printf("Capture Test Pass!!\n");
- }
- void SYS_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init System Clock */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Enable Internal RC clock */
- CLK->PWRCON |= CLK_PWRCON_OSC22M_EN_Msk;
- /* Waiting for IRC22M clock ready */
- while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk));
- /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
- CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;
- CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_HIRC;
- CLK->CLKDIV &= ~CLK_CLKDIV_HCLK_N_Msk;
- /* Set PLL to power down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/
- CLK->PLLCON |= CLK_PLLCON_PD_Msk;
- /* Enable external 12MHz XTAL, internal 22.1184MHz */
- CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC22M_EN_Msk;
- /* Enable PLL and Set PLL frequency */
- CLK->PLLCON = PLLCON_SETTING;
- /* Waiting for clock ready */
- while(!(CLK->CLKSTATUS & (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->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;
- /* Enable IP clock */
- CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk | CLK_APBCLK_PWM01_EN_Msk | CLK_APBCLK_PWM23_EN_Msk;
- /* IP clock source */
- CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL;
- /* IP clock source */
- CLK->CLKSEL1 |= CLK_CLKSEL1_PWM01_S_HXT | CLK_CLKSEL1_PWM23_S_HXT;
- /* Reset PWMA channel0~channel3 */
- SYS->IPRSTC2 = SYS_IPRSTC2_PWM03_RST_Msk;
- SYS->IPRSTC2 = 0;
- /* Update System Core Clock */
- SystemCoreClockUpdate();
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set P3 multi-function pins for UART RXD and TXD */
- SYS->P3_MFP = SYS_MFP_P30_RXD | SYS_MFP_P31_TXD;
- /* Set P2 multi-function pins for PWMA Channel 1 and 2 */
- SYS->P2_MFP = SYS_MFP_P21_PWM1 | SYS_MFP_P22_PWM2;
- }
- void UART0_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init UART */
- /*---------------------------------------------------------------------------------------------------------*/
- UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(PLL_CLOCK, 115200);
- UART0->LCR = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Main Function */
- /*---------------------------------------------------------------------------------------------------------*/
- 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 PWMA channel 2 to capture\n the signal from PWMA channel 1.\n");
- printf(" I/O configuration:\n");
- printf(" PWM1(P2.1 PWMA channel 1) <--> PWM2(P2.2 PWMA channel 2)\n\n");
- printf("Use PWMA Channel 2(P2.2) to capture the PWMA Channel 1(P2.1) Waveform\n");
- while(1)
- {
- printf("Press any key to start PWM Capture Test\n");
- getchar();
- /*--------------------------------------------------------------------------------------*/
- /* Set the PWMA 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 PWMA channel 1 output configuration */
- PWM_ConfigOutputChannel(PWMA, PWM_CH1, 250, 30);
- /* Enable PWM Output path for PWMA channel 1 */
- PWM_EnableOutput(PWMA, 0x2);
- /* Enable Timer for PWMA channel 1 */
- PWM_Start(PWMA, 0x2);
- /*--------------------------------------------------------------------------------------*/
- /* Set the PWMA 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 PWMA channel 2 capture configuration */
- PWM_ConfigCaptureChannel(PWMA, PWM_CH2, 166, 0);
- /* Enable capture falling edge interrupt for PWMA channel 2 */
- PWM_EnableCaptureInt(PWMA, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);
- /* Enable PWMA NVIC interrupt */
- NVIC_EnableIRQ((IRQn_Type)(PWMA_IRQn));
- /* Enable Timer for PWMA channel 2 */
- PWM_Start(PWMA, 0x4);
- /* Enable Capture Function for PWMA channel 2 */
- PWM_EnableCapture(PWMA, 0x4);
- /* Wait until PWMA channel 2 Timer start to count */
- while(PWMA->PDR2 == 0);
- /* Capture the Input Waveform Data */
- CalPeriodTime(PWMA, PWM_CH2);
- /*------------------------------------------------------------------------------------------------------*/
- /* Stop PWMA 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 PWMA channel 1 loaded value as 0 */
- PWM_Stop(PWMA, 0x2);
- /* Wait until PWMA channel 1 Timer Stop */
- while(PWMA->PDR1 != 0);
- /* Disable Timer for PWMA channel 1 */
- PWM_ForceStop(PWMA, 0x2);
- /* Disable PWM Output path for PWMA channel 1 */
- PWM_DisableOutput(PWMA, 0x2);
- /*------------------------------------------------------------------------------------------------------*/
- /* Stop PWMA 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 PWMA NVIC */
- NVIC_DisableIRQ((IRQn_Type)(PWMA_IRQn));
- /* Set loaded value as 0 for PWMA channel 2 */
- PWM_Stop(PWMA, 0x4);
- /* Wait until PWMA channel 2 current counter reach to 0 */
- while(PWMA->PDR2 != 0);
- /* Disable Timer for PWMA channel 2 */
- PWM_ForceStop(PWMA, 0x4);
- /* Disable Capture Function and Capture Input path for PWMA channel 2*/
- PWM_DisableCapture(PWMA, 0x4);
- /* Clear Capture Interrupt flag for PWMA channel 2*/
- PWM_ClearCaptureIntFlag(PWMA, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);
- }
- }