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There is a problem in function convert:
The conversion from BCD to asc
g = 30 | d1;
Shuld be
g = 0x30 | d1;
The value 0x30 is the ASCII code of the character '0' (zero) [May be written as '0' but not as 30]
Maybe the problem is related to timing.
In your code you placed a delay(1) while en is high and no delay while it is low.
Actually the display needs at least 2 milisec while it is low. To admit data the active high pulse of en may be very short.
Indeed you may use GPIO to make a spi interface. The problem is that if you don't use hardware support it will be a bit slower and will keep the processor busy. The microcontroler will have to control all signals as GPIO (CE, SCL, and MOSI and read MISO).
I have written a program to read/write a smartcard with LPC2378(similar to 24C16). See
**broken link removed**
I noticed that i had a problem writing in a burst across 8 byte page boundaries (no problem reading).
I think the device needs some time.
I suggest to change your code to automatically...
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