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申请的PIC24F16KL402开发板使用笔记五: 产生PWM例程

2015-3-25 23:06:47 6238 PWM

0 本帖最后由 wanghe334 于 2015-3-26 22:38 编辑 PWM Code example with CCP2 and tiMER2. 复制代码看手册看的眼疼了，不过还是有效果的越来越顺手了对于PIC24F，PWM终于出来了。晒晒效果图 CCP1 + Timer2: PIC24 器件支持通过外设控制引脚方向，而不是使用引脚的对应TRIS 位，配置TRIS 位将不能保证正确的引脚功能。使用CCP 模块的建议启动序列如下： 1. 通过将0000 写入CCPxM<3:0> （CCPxCON<3:0>）禁止模块。 2. 将CCPx 引脚和任何Px 引脚（对于增强型PWM 模式）的TRIS 位置1。该操作将引脚配置为输入引脚。 3. 将初始值写入CCPRxL和CCPRxH。对于增强型PWM模式，还应配置ECCPxCON<7:6>。 4. 通过将相应的模式选择值写入CCPxM<3:0> 使能CCP 模块。当模块被使能时，它将引脚控制在正确的数据方向。 Code: /* * File: mainXC16.c * Author: Administrator * * Created on 2015?3?25?, ??10:13 / #include "xc.h" _FBS ( BWRP_OFF & // Boot Segment Write Protect (Disabled) BSS_OFF // Boot segment Protect (No boot flash segment) ) //_FGS //( // GWRP_OFF & // General Segment Flash Write Protect (General segment may be written) // GSS0_OFF // General Segment Code Protect (No Protection) //) _FOSCSEL ( FNOSC_FRC & // Oscillator Select (8MHz FRC with Postscaler (FRCDIV)) // SOSCSRC_ANA & // SOSC Source Type (Analog Mode for use with crystal) // LPRCSEL_HP & // LPRC Power and Accuracy (High Power/High Accuracy) IESO_ON // Internal External Switch Over bit (Internal External Switchover mode enabled (Two-speed Start-up enabled)) ) _FOSC ( // POSCMD_HS & // Primary Oscillator Mode (Primary oscillator disabled) OSCIOFNC_ON & // CLKO Enable Configuration bit (CLKO output signal enabled) POSCFREQ_MS & // Primary Oscillator Frequency Range Configuration bits (Primary oscillator/external clock frequency between 100kHz to 8MHz) SOSCSEL_SOSCHP &// SOSC Power Selection Configuration bits (Secondary Oscillator configured for high-power operation) FCKSM_CSECME // Clock Switching and Monitor Selection (Clock Switching and Fail-safe Clock Monitor Enabled) ) _FWDT ( // WDTPS_PS32768 & // Watchdog Timer Postscale Select bits (1:32768) FWPSA_PR128 & // WDT Prescaler bit (WDT prescaler ratio of 1:128) FWDTEN_OFF & // Watchdog Timer Enable bits (WDT disabled in hardware; SWDTEN bit disabled) WINDIS_OFF // Windowed Watchdog Timer Disable bit (Standard WDT selected (windowed WDT disabled)) ) // Warning: // Always enable MCLRE_ON config bit setting so that the MCLR pin function will // work for low-voltage In-Circuit Serial Programming (ICSP). The Microstick // programming circuitry only supports low-voltage ICSP. If you disable MCLR pin // functionality, a high-voltage ICSP tool will be required to re-program the // part in the future. _FPOR ( BOREN_BOR3 & // Brown-out Reset Enable bits (Enabled in hardware; SBOREN bit disabled) PWRTEN_ON & // Power-up Timer Enable (PWRT enabled) I2C1SEL_PRI & // Alternate I2C1 Pin Mapping bit (Default SCL1/SDA1 Pins for I2C1) BORV_V18 & // Brown-out Reset Voltage bits (Brown-out Reset at 1.8V) MCLRE_ON // MCLR Pin Enable bit (RA5 input disabled; MCLR enabled) ) _FICD ( ICS_PGx3 // ICD Pin Placement Select (EMUC/EMUD share PGC3/PGD3) ) void delay(unsigned int uiCnt) { int i,j; for(i=0;i for(j=0;j<110;j++); } void init_PWM1_IO() { //TRISBbits.TRISB10 = 1; //Set SDI1 as an input. //TRISBbits.TRISB13 = 0; //Set SDO1 as an output. //TRISBbits.TRISB11 = 0; //Set SCK1 as an output. //TRISBbits.TRISB15 = 0; //Set SS1 as an output. TRISAbits.TRISA0 = 0; TRISBbits.TRISB3 = 0; TRISAbits.TRISA6 = 0; } void init_pwm() { CCP1CON = 0b0000000000001100; CCPTMRS0 = 0; } void Timer_Init(void) { T2CON = 0x0; T2CONbits.TCKPS = 1; T2CONbits.T2CKPS1 = 0; TMR2 = 0x00; PR2 = 0x000f; IPC1bits.T2IP = 0x01; IFS0bits.T2IF = 0; IEC0bits.T2IE = 1; T2CONbits.TON = 1; } int main(void) { init_PWM1_IO(); init_pwm(); Timer_Init(); while(1) { delay(200); LATAbits.LATA0 ^= 1; } return 0; } void __attribute__((interrupt, shadow, no_auto_psv)) _T2Interrupt(void) { IFS0bits.T2IF = 0; //Clear Timer3 interrupt flag } 复制代码* 0
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