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Gu
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| Glcd doesnt work! |
 Posted: Sat Nov 17, 2007 8:23 am |
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Hello,
I´m using a PIC16F877A to controll the tech 12864, a 128x64 glcd.
I can set the display contrast very well and the pic is working fine. I have a flat cable connecting the GLCD to board. Bu the displays seems not to work!!
I could see in an oscilloscope that the bits are going right withou the connection to the GLCD. When I plug the cable in the GLCD, my DATA bus get stuck to "zero".
By the way, i dont use the PORT D for the Data bus, I have de data bus splitted in ports B and C.
I made a simulation of my program at Proteus and it´s working fine.
Evem a simple code doesnt make the display to wotk!!
Can anyone help me please??? |
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chrisaljar
Joined: 18 Nov 2007
Posts: 1
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| Posted: Sun Nov 18, 2007 3:32 pm |
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hello gu
post your code dude,
chris |
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Gu
Guest
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| Posted: Mon Nov 19, 2007 12:15 pm |
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Hi, Chris
My code is way too long, so I´m posting here only the part I've changed to work with my data bus. I have de data0-4 in port B (B3-B7) and data5-7 in port C (C0-C2).
Mostly, I used the GLCD.h and changed as I wanted...
| Code: |
#ifndef GLCD_CS1
#define GLCD_CS1 PIN_C3 // Chip Selection 1
#endif
#ifndef GLCD_CS2
#define GLCD_CS2 PIN_C5 // Chip Selection 2
#endif
#ifndef GLCD_DI
#define GLCD_DI PIN_B0 // Data or Instruction input
#endif
#ifndef GLCD_RW
#define GLCD_RW PIN_B1 // Read/Write
#endif
#ifndef GLCD_E
#define GLCD_E PIN_B2 // Enable
#endif
#ifndef GLCD_RST
#define GLCD_RST PIN_C4 // Reset
#endif
#define GLCD_LEFT 0
#define GLCD_RIGHT 1
// Purpose: Write a byte of data to the specified chip
// Inputs: 1) chipSelect - which chip to write the data to
// 2) data - the byte of data to write
void glcd_writeByte(int1 side, int data)
{
if(side) // Choose which side to write to
output_high(GLCD_CS2);
else
output_high(GLCD_CS1);
output_low(GLCD_RW); // Set for writing
set_tris_b(0x00);
set_tris_c(0x00);
output_bit(pin_B3,bit_test(data,0)); // Put the data on the port
output_bit(pin_B4,bit_test(data,1));
output_bit(pin_B5,bit_test(data,2));
output_bit(pin_B6,bit_test(data,3));
output_bit(pin_B7,bit_test(data,4));
output_bit(pin_C0,bit_test(data,5));
output_bit(pin_C1,bit_test(data,6));
output_bit(pin_C2,bit_test(data,7));
delay_cycles(1);
output_high(GLCD_E); // Pulse the enable pin
delay_cycles(5);
output_low(GLCD_E);
output_low(GLCD_CS1); // Reset the chip select lines
output_low(GLCD_CS2);
}
// Purpose: Reads a byte of data from the specified chip
// Ouputs: A byte of data read from the chip
int glcd_readByte(int1 side)
{
int data, datab, datac, i; // Stores the data read from the LCD
set_tris_b(0xF8); // Set port b and c to input
set_tris_c(0x07);
output_high(GLCD_RW); // Set for reading
if(side) // Choose which side to write to
output_high(GLCD_CS2);
else
output_high(GLCD_CS1);
delay_cycles(1);
output_high(GLCD_E); // Pulse the enable pin
delay_cycles(4);
datab = input_b(); // Get the data from the display's output register
datac = input_c();
set_tris_b(0xF8);
set_tris_c(0x07);
output_low(GLCD_E);
output_low(GLCD_CS1); // Reset the chip select lines
output_low(GLCD_CS2);
for (i=3;i<8;i++) //data é composto de B3 a C2
{
if(bit_test(datab,i))
bit_set(data,i-3);
else
bit_clear(data,i-3);
}
for (i=0;i<3;i++)
{
if (bit_test(datac,i))
bit_set(data,i+5);
else
bit_clear(data,i+5);
}
return data; // Return the read data
}
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Thanks a lot![/code] |
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Gu
Guest
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| Posted: Mon Nov 19, 2007 12:24 pm |
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Anyway, I know the PIC is working, so I think the GLCD is gone...
I will try another one also. |
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