PIC18F4520奇怪的现象

只看该作者 · 2021-4-23 17:02

本帖最后由 skaler1 于 2021-4-23 17:02 编辑

18F4520做了一个简单的定时器控制的LED亮灭。在软件仿真的时候，定时时间，io引脚输出高低电平都是符合要求的。问题：在硬件烧写后，程序老是不能正常跑，用手碰一下地线或者压一下LED，或者用手把板子拎起来，都能正常工作。我以为是我焊点虚焊的，但是在LED不亮灭的时候，我用示波器抓了一下LED输出脚的波形，波形没有输出。 VPP脚高电平，输入5V也是正常。所以我判断不是虚焊的问题。因为软件仿真的时候是正常的，我怀疑，是不是我配置位没有配置好,请高手指点。VPP和VCC直接接了一个10k的电阻。LED输出用的是RA0和RA1.

只看该作者 · 2021-4-23 17:04

我把我的配置位贴上：
// CONFIG1H
#pragma config OSC = INTIO7    // Oscillator Selection bits (Internal oscillator block, CLKO function on RA6, port function on RA7)
#pragma config FCMEN = OFF    // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF    // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)

// CONFIG2L
#pragma config PWRT = OFF    // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = ON    // Brown-out Reset Enable bits (Brown-out Reset disabled in hardware and software)
#pragma config BORV = 3       // Brown Out Reset Voltage bits (Minimum setting)

// CONFIG2H
#pragma config WDT = OFF       // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768)

// CONFIG3H
#pragma config CCP2MX = PORTC // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
#pragma config PBADEN = ON    // PORTB A/D Enable bit (PORTB<4:0> pins are configured as analog input channels on Reset)
#pragma config LPT1OSC = OFF // Low-Power Timer1 Oscillator Enable bit (Timer1 configured for higher power operation)
#pragma config MCLRE = OFF    // MCLR Pin Enabl  e bit (MCLR pin enabled; RE3 input pin disabled)

// CONFIG4L
#pragma config STVREN = ON    // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config LVP = ON       // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled)
#pragma config XINST = OFF    // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))

// CONFIG5L
#pragma config CP0 = OFF       // Code Protection bit (Block 0 (000800-001FFFh) not code-protected)
#pragma config CP1 = OFF       // Code Protection bit (Block 1 (002000-003FFFh) not code-protected)
#pragma config CP2 = OFF       // Code Protection bit (Block 2 (004000-005FFFh) not code-protected)
#pragma config CP3 = OFF       // Code Protection bit (Block 3 (006000-007FFFh) not code-protected)

// CONFIG5H
#pragma config CPB = OFF       // Boot Block Code Protection bit (Boot block (000000-0007FFh) not code-protected)
#pragma config CPD = OFF       // Data EEPROM Code Protection bit (Data EEPROM not code-protected)

// CONFIG6L
#pragma config WRT0 = OFF    // Write Protection bit (Block 0 (000800-001FFFh) not write-protected)
#pragma config WRT1 = OFF    // Write Protection bit (Block 1 (002000-003FFFh) not write-protected)
#pragma config WRT2 = OFF    // Write Protection bit (Block 2 (004000-005FFFh) not write-protected)
#pragma config WRT3 = OFF    // Write Protection bit (Block 3 (006000-007FFFh) not write-protected)

// CONFIG6H
#pragma config WRTC = OFF    // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected)
#pragma config WRTB = OFF    // Boot Block Write Protection bit (Boot block (000000-0007FFh) not write-protected)
#pragma config WRTD = OFF    // Data EEPROM Write Protection bit (Data EEPROM not write-protected)

// CONFIG7L
#pragma config EBTR0 = OFF    // Table Read Protection bit (Block 0 (000800-001FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF    // Table Read Protection bit (Block 1 (002000-003FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF    // Table Read Protection bit (Block 2 (004000-005FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF    // Table Read Protection bit (Block 3 (006000-007FFFh) not protected from table reads executed in other blocks)

// CONFIG7H
#pragma config EBTRB = OFF    // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) not protected from table reads executed in other blocks)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

只看该作者 · 2021-4-25 10:48

配置字看着还好。
1. RA0，RA1不接LED，用示波器量有没有问题？
2. 用一个极其简单的代码，就是翻转RA0，RA1，结果如何？

只看该作者 · 2021-4-25 11:02

#pragma config LVP = OFF