18F46J11程序设计

场景：具有4线LCD、DS1302 RTC、25LC1024 EEPROM、ADM48 8 RS422接口的控制盒全部连接到18F46J11。这个盒子已经完美地工作了好几年，在它的一生中已经有几次成功的固件升级。需要对代码进行非常微小的更改，重新编译源代码和使用PICtiT3的MPLABX IPE重新编程。死盒子！实际上，并不是完全死掉，但是EEPROM和RTC都失败了，串行例程仍然工作良好，正如它的LCD所显示的那样，它显示了它正确地发送和接收串行数据。我的第一个想法是恢复到我已经存档的以前版本。它根本没有改变症状。从逻辑分析仪上看，EEPROM和RTC的信号是非常错误的。从编译器中查看程序集列表，很容易看出BIT的例程是可以的，但是PIC上的实际引脚似乎没有遵循代码。波尔塔、PORTB和PORTC都是错误的，但奇怪的是，驱动LCD的PORTD上有正确的信号。我尝试改变PIC，但新的工作原理完全相同。我开始认为IPE程序有问题，以前我使用了PICTIT2，但不幸的是它不支持IPE V 5。它看起来像预期的那样运动，PIC验证为正确编程，但似乎有一个基本的失败，这么多的功能，它必须与配置有关。配置寄存器读回正确，但是我注意到在寄存器视图中从CONT1L中删除了调试位，我想知道它是否与其他位中的一个交换。类似于启用扩展指令集而不是禁用调试位会引起我看到的问题。有人对此有什么经验吗？布莱恩。
                    
                    
               
                                                                                      以下为原文

                                                                            Scenario:
Control box with 4-line LCD, DS1302 RTC, 25LC1024 EEPROM, ADM488 RS422 interface all hooked to an 18F46J11.  The box has been working flawlessly for several years and has has several successful firmware upgrades in it's lifetime.  A very minor change to the code was needed, the source recompiled and MPLABX IPE with Pickit3 used to reprogram it.  Dead box!

Actually, not completely dead but the EEPROM and RTC both fail, the serial routines are still working fine as witnessed on it's LCD which shows it is sending and receiving serial data correctly.  My first thought was to revert to the previous version which I have archived.  It didn't change the symptoms at all.  Looking on a logic analyzer, the signals to the EEPROM and RTC are quite wrong. Looking at the assembly listing from the compiler it is easy to see the bit-banged routines are OK but the actual pins on the PIC don't seem to be following the code.  PORTA, PORTB and PORTC are wrong but curiously PORTD which drives the LCD has the correct signals on it. I tried changing the PIC but the new one works exactly the same.

I'm beginning to think something is wrong with the IPE program, previously I used a Pickit2 but unfortunately it isn't supported in IPE v 5. It seems to go through the motions as expected and the PIC verifies as programmed correctly but something seems to be causing a fundamental failure to so many functions it has to be configuration related.  The config registers read back correctly but I notice the DEBUG bit is missing from CONFIG1L in the register view, I'm wondering if it is swapped with one of the other bits.  Something like enabling the extended instruction set instead of disabling the DEBUG bit would cause the kind of problem I see.

Has anyone any experience of this?

Brian.