Re: OLED Character Module is actually not responding

Hi all

I've been able to solve the problem. I reduced the External I/O
transaction speed by dividing the CPU clock speed by 8, using the IB7ER
register. Therefore, the hold time for the chip-select strobe (PB7)
signal was increased to be within its required value.

Since the latest Dynamic C software did not recognise the mnemonic
keyword IB7ER, I made a definition for the keyword since I was able to
obtain its I/O address (0x045F) in the Rabbit 6000 User's manual.

Hope this will be useful to anyone who might come into a similar kind of
problem.

Cheers


--- In [email protected], "Taiwo" wrote:
>
> Hello everyone
> I wrote a message some days back titled "Aux I/O is not responding."
> After verifying the output signals of the RCM6700 pins using an MSO
> picoscope, I realised the pins are actually responding but the module
is
> not displaying anything at all.
> I had done a little bit of research in the predefined LCD122KEY7.LIB
> file to work out the wait states required among other things. I have
> configured the PA pins to serve as the data bus, while PB3 and PB2 are
> the R/W and RS pins of the OLED module with PB3 always low since I am
> only writing to the OLED. I have also configured PE7 to serve as the
I/O
> chip select strobe (15 wait states, write-enabled and inverted (active
> high)), which is connected to the Enable pin of the OLED.
> Below (displayed in red) is a part of my design that shows my
> initialisation process. Please can you have a look and tell me what I
> might be missing out.
>
> #define PORTA_AUX_IO
> void SendToDisplay(int addr, char value) // addr is used to make the
RS
> pin high or low{ WrPortE(addr+oxE000, NULL, value);}
> void OLEDInit(void){ //Initialise PE7 to be the OLED chip select
strobe
> WrPortI(IB7CR, &IB7CRShadow, 0x08); BitWrPortI(PEAHR, &PEAHRShadow, 0,
> 6); BitWrPortI(PEAHR, &PEAHRShadow, 0, 7); WrPortI(PEFR, &PEFRShadow,
> (PEFRShadow|0x80));
> MsDelay(1000); 1sec delay to allow OLED boot up
> SendToDisplay(0, '\B00111001'); // 8-bit, 2 line, 5x8 dots, Western
> European font SendToDisplay(0, '\B00001100'); // Display on, cursor
> off, non-blinking cursor SendToDisplay(0, '\B00000110'); // Increment
> and non-shift display
> return;}
> void DisplayOnOLED(char* str){ int i; for (i = 0; i < strlen(str);
i++)
> { SendToDisplay(1, str[i]); }}
> void ClearOLED(void){ SendToDisplay(0, 0x01); MsDelay(3); // 3ms to
> clear display}
> void DisplayLine(char* str, char line){ char buffer[21];
memset(buffer,
> ' ', 21); buffer[20] = '\0';
> SendToDisplay(0, line);
> memcpy(buffer, str, strlen(str));
> DisplayOnOLED(buffer); }
> int main (){ char str[21] = "Hello World!"; OLEDInit(); ClearOLED();
> DisplayLine(str, 0x80);
> return 0;}
> Please can you assist in finding where the bug will be located..... I
> have tried so many things like making PE7 active-low (default).
> Thanks
>