使用 PPS 的输入捕获映射
Input Capture mapping using PPS
我正在尝试配置 dsPIC33EP32MC204 上的输入捕捉模块 (IC1) 以将其用于占空比测量。作为输入，我想使用 RP35 引脚。为了测试配置的正确性，我设置了一个实验：我连接了一个具有 1Hz PWM 脉冲的脉冲发生器，并设置输入捕获以捕获每个上升沿。我估计这些上升沿会触发输入捕获中断，每次中断调用都会导致 LED 闪烁。不幸的是它不工作。如果有人能告诉我问题出在哪里，我将不胜感激。代码：
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 = 1; // Setup IC1 interrupt priority level
IFS0bits.IC1IF = 0; // Clear IC1 Interrupt Status Flag
IEC0bits.IC1IE = 1; // Enable IC1 interrupt
}
中断：
void __attribute__((__interrupt__, no_auto_psv)) _IC1Interrupt(void)
{
LATBbits.LATB9 = ~LATBbits.LATB9;
IFS0bits.IC1IF = 0;
}
以及 main() 中的相关代码：
__builtin_write_OSCCONL(OSCCON & ~(1<<6));
RPINR7 = 0x23; ; // IC1 mapped to RP35
__builtin_write_OSCCONL(OSCCON | (1<<6));
在设置过程中，我遵循了家庭参考手册中的说明。
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。
这是您使用所需的最低设置代码更正的代码：
/*
* 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;
}
我正在尝试配置 dsPIC33EP32MC204 上的输入捕捉模块 (IC1) 以将其用于占空比测量。作为输入，我想使用 RP35 引脚。为了测试配置的正确性，我设置了一个实验：我连接了一个具有 1Hz PWM 脉冲的脉冲发生器，并设置输入捕获以捕获每个上升沿。我估计这些上升沿会触发输入捕获中断，每次中断调用都会导致 LED 闪烁。不幸的是它不工作。如果有人能告诉我问题出在哪里，我将不胜感激。代码：
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 = 1; // Setup IC1 interrupt priority level
IFS0bits.IC1IF = 0; // Clear IC1 Interrupt Status Flag
IEC0bits.IC1IE = 1; // Enable IC1 interrupt
}
中断：
void __attribute__((__interrupt__, no_auto_psv)) _IC1Interrupt(void)
{
LATBbits.LATB9 = ~LATBbits.LATB9;
IFS0bits.IC1IF = 0;
}
以及 main() 中的相关代码：
__builtin_write_OSCCONL(OSCCON & ~(1<<6));
RPINR7 = 0x23; ; // IC1 mapped to RP35
__builtin_write_OSCCONL(OSCCON | (1<<6));
在设置过程中，我遵循了家庭参考手册中的说明。
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。
这是您使用所需的最低设置代码更正的代码：
/*
* 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;
}