我正在尝试在 PIC 16LF1827 上使用捕获模块,但从未输入 ISR。我从一个基本的下降沿中断(有效)开始,然后在定时器 1 配置中添加(仍然有效),然后禁用 IOC 中断并配置/启用相关的 CCP 中断(从未进入 ISR)。代码如下:注释部分是原始的基本 IOC 设置。
我已经用 MPLab 调试器验证了没有输入 ISR,并通过将其连接到逻辑分析仪并观察 RB1 来确认这一点。
#include "htc.h"
//config1
//internal osc, no wdt, use power-up timer, enable reset
// no code protection, brown-out-reset enabled, clkout is gpio,
// internal-external switchover off, failsafe clock monitor off
__CONFIG(FOSC_INTOSC & WDTE_OFF & PWRTE_ON
& MCLRE_ON & CP_OFF & CPD_OFF & BOREN_ON
& CLKOUTEN_OFF & IESO_OFF & FCMEN_OFF);
//config2 (following MPLab's complaints when running debugger)
//low-voltage programming off, debug on, brown-out reset at 2.7 v
// stack over/under flow triggers reset, no 4x pll,
// no flash write protection
__CONFIG(LVP_OFF & DEBUG_ON & BORV_27
& STVREN_ON & PLLEN_OFF & WRT_OFF);
void interrupt isr(void){
//bounce pin 1
LATB ^= 0b10;
LATB ^= 0b10;
if(IOCIF && IOCBF0){
IOCBF0 = 0;
IOCIF = 0;
}
if (CCP1IF){
CCP1IF = 0;
}
}
void main(void){
//configure internal oscillator:
//PLL = 0, source = from config 1, frequency = 4 mhz
//0b0: SPLLEN_OFF
OSCCONbits.SPLLEN = 0b0;
//0b00: use config word 1
OSCCONbits.SCS = 0b00;
//0b1101: 4 mhz frequency
OSCCONbits.IRCF = 0b1101;
//configure peripherals
//PORT A: LEDs (output), digital
TRISA = 0x00;
ANSELA = 0;
//PORT B: digital, 0 = input, 1 = output, rest don't care
TRISB = 0b11111101;
ANSELB = 0;
//configure timer 1 (not needed for basic IOC)
//source = instruction clock, prescale = 1:1, disable LP osc, do synchronize (DC)
//0b00: instruction clock
T1CONbits.TMR1CS = 0b00;
//0b00: 1:1
T1CONbits.T1CKPS = 0b00;
//0b0: lp osc off
T1OSCEN = 0b0;
//0b0: synch (ignored)
nT1SYNC = 0b0;
//interrupts
/*
//IOC enabled on falling edge for port B 0
IOCBN0 = 0b00000001;
IOCIE = 1;
*/
//Capture on falling edge for port B 0
//notes in 23.1 of DS: disable interrupt, set operating mode, clear flag, enable interrupt
CCP1IE = 0b0;
//0b100: every falling edge
CCP1CONbits.CCP1M = 0b100;
CCP1IF = 0b0;
CCP1IE = 0b1;
//enable peripheral interrupts, global interrupts
PEIE = 1;
GIE = 1;
//start timer 1
TMR1ON = 1;
while(1){
//Toggle led 0
LATA ^= 0b1;
}
}
我正在使用在 MPLab 中运行的 HI-TECH C 编译器 (lite)。
任何建议将不胜感激。如果我使用术语,我深表歉意,这是我在 PIC 上的第一个项目。