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使用PPS输入捕获映射
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使用PPS输入捕获映射
作者:
猫南北
发布时间:
2025-03-09 07:08:55 (10小时前)
转自：
<div class =“excerpt”> 我正在尝试在dsPIC33EP32MC204上配置输入捕捉模块（IC1），以将其用于占空比测量。作为输入，我想使用RP35引脚。为了测试我设置的配置的正确性...... </DIV>
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猫南北
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2019-08-31 10-32
<div class =“post-text”itemprop =“text”> <P> 您发布的代码可能更完整。对于dsPIC控制器，必须准确显示所有配置位的设置方式以及系统时钟的初始化方式。 </p> <P> 这是您使用所需的最低设置代码更正的代码： </p> <pre> <code> /* * file: main.c * target: dsPIC33EP32MC204 * IDE: MPLABX v4.05 * Compiler: XC16 v1.35 * * Description: * Use Input Capture 1 module to catch a 1Hz pulse on GPIO RP35 and toggle LED on RB9. * */ #pragma config ICS = PGD2 // ICD Communication Channel Select bits (Communicate on PGEC2 and PGED2) #pragma config JTAGEN = OFF // JTAG Enable bit (JTAG is disabled) #pragma config ALTI2C1 = OFF // Alternate I2C1 pins (I2C1 mapped to SDA1/SCL1 pins) #pragma config ALTI2C2 = OFF // Alternate I2C2 pins (I2C2 mapped to SDA2/SCL2 pins) #pragma config WDTWIN = WIN25 // Watchdog Window Select bits (WDT Window is 25% of WDT period) #pragma config WDTPOST = PS32768 // Watchdog Timer Postscaler bits (1:32,768) #pragma config WDTPRE = PR128 // Watchdog Timer Prescaler bit (1:128) #pragma config PLLKEN = ON // PLL Lock Enable bit (Clock switch to PLL source will wait until the PLL lock signal is valid.) #pragma config WINDIS = OFF // Watchdog Timer Window Enable bit (Watchdog Timer in Non-Window mode) #pragma config FWDTEN = OFF // Watchdog Timer Enable bit (Watchdog timer enabled/disabled by user software) #pragma config POSCMD = NONE // Primary Oscillator Mode Select bits (Primary Oscillator disabled) #pragma config OSCIOFNC = OFF // OSC2 Pin Function bit (OSC2 is clock output) #pragma config IOL1WAY = OFF // Peripheral pin select configuration (Allow multiple reconfigurations) #pragma config FCKSM = CSECMD // Clock Switching Mode bits (Clock switching is enabled,Fail-safe Clock Monitor is disabled) #pragma config FNOSC = FRC // Oscillator Source Selection (Internal Fast RC (FRC)) #pragma config PWMLOCK = ON // PWM Lock Enable bit (Certain PWM registers may only be written after key sequence) #pragma config IESO = OFF // Two-speed Oscillator Start-up Enable bit (Start up with user-selected oscillator source) #pragma config GWRP = OFF // General Segment Write-Protect bit (General Segment may be written) #pragma config GCP = OFF // General Segment Code-Protect bit (General Segment Code protect is Disabled) #include <xc.h> /* Setup the clock to run at about 60 MIPS */ #define FOSC (7372800L) /* nominal fast RC frequency */ #define PLL_N1 (2L) /* PLLPRE CLKDIV<4:0> range 2 to 33 */ #define PLL_M (65L) /* PLLDIV PLLFBD<8:0> range 2 to 513 */ #define PLL_N2 (2L) /* PLLPOST CLKDIV<7:6> range 2, 4 or 8 */ #define FSYS (FOSC*PLL_M/(PLL_N1*PLL_N2)) #define FCYC (FSYS/2L) /* * Global constant data */ const unsigned long gInstructionCyclesPerSecond = FCYC; /* * Initialize this PIC */ void PIC_Init( void ) { unsigned int ClockSwitchTimeout; /* ** Disable all interrupt sources */ __builtin_disi(0x3FFF); /* disable interrupts for 16383 cycles */ IEC0 = 0; IEC1 = 0; IEC2 = 0; IEC3 = 0; IEC4 = 0; IEC5 = 0; IEC6 = 0; IEC8 = 0; IEC9 = 0; __builtin_disi(0x0000); /* enable interrupts */ CLKDIV = 0; /* Disable DOZE mode */ if(!OSCCONbits.CLKLOCK) /* if primary oscillator switching is unlocked */ { /* Select primary oscillator as FRC */ __builtin_write_OSCCONH(0b000); /* Request switch primary to new selection */ __builtin_write_OSCCONL(OSCCON | (1 << _OSCCON_OSWEN_POSITION)); /* wait, with timeout, for clock switch to complete */ for(ClockSwitchTimeout=10000; --ClockSwitchTimeout && OSCCONbits.OSWEN;); /* Configure PLL prescaler, PLL postscaler, PLL divisor */ PLLFBD=PLL_M-2; /* M=65 */ #if PLL_N2==2 CLKDIVbits.PLLPOST=0; /* N2=2 */ #elif PLL_N2==4 CLKDIVbits.PLLPOST=1; /* N2=4 */ #elif PLL_N2==8 CLKDIVbits.PLLPOST=3; /* N2=8 */ #else #error invalid PLL_N2 paramenter #endif CLKDIVbits.PLLPRE=PLL_N1-2; /* N1=2 */ /* Select primary oscillator as FRCPLL */ __builtin_write_OSCCONH(0b001); /* Request switch primary to new selection */ __builtin_write_OSCCONL(OSCCON | (1 << _OSCCON_OSWEN_POSITION)); /* wait, with timeout, for clock switch to complete */ for(ClockSwitchTimeout=10000; --ClockSwitchTimeout && OSCCONbits.OSWEN;); /* wait, with timeout, for the PLL to lock */ for(ClockSwitchTimeout=10000; --ClockSwitchTimeout && !OSCCONbits.LOCK;); /* at this point the system oscillator should be 119.808MHz */ } /* make all inputs digital I/O */ ANSELA = 0x00; ANSELB = 0x00; ANSELC = 0x00; /* Unlock PPS Registers */ __builtin_write_OSCCONL(OSCCON & ~(_OSCCON_IOLOCK_MASK)); /* map all PPS pins */ RPINR7bits.IC1R = 35; // Select RP35 (RB3/PGED1) as input for IC1 /* Lock PPS Registers */ __builtin_write_OSCCONL(OSCCON | (_OSCCON_IOLOCK_MASK)); } /* * Initialize Input Capture 1 */ void Init_InputCapture( void ) { IC1CON1bits.ICSIDL = 0; IC1CON1bits.ICTSEL = 0b111; // Peripheral clock (FP) is the clock source of the ICx IC1CON1bits.ICI = 0b00; // IC1CON1bits.ICM = 0b011; //Capture mode every edge rising IC1CON2bits.ICTRIG = 0; // = Input source used to trigger the input capture timer (Trigger mode) IC1CON2bits.SYNCSEL = 0b00000; //IC1 module synchronizes or triggers ICx IC1CON2bits.IC32 = 0; // 16 bit mode only // Enable Capture Interrupt And Timer2 IPC0bits.IC1IP = 4; // Setup IC1 interrupt priority level IFS0bits.IC1IF = 0; // Clear IC1 Interrupt Status Flag IEC0bits.IC1IE = 1; // Enable IC1 interrupt } /* * Interrupt Service Routine for IC1 */ void __attribute__((__interrupt__, no_auto_psv)) _IC1Interrupt(void) { IFS0bits.IC1IF = 0; LATBbits.LATB9 ^= 1; // toggle LED } /* * Main process loop */ int main( void ) { PIC_Init(); TRISBbits.TRISB9 = 0; // make RB9 an output LATBbits.LATB9 = 0; // turn off LED Init_InputCapture(); for(;;) { /* process loop */ } return 0; } </code> </pre> </DIV>
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