Graphic LCD Display ST7565R
Page last updated 11 Nov 2010, by 
ceri clatworthy.
1 reply
ceri clatworthy.
1 reply
This is a nice 128 by 64 pixel LCD Display, available from RS
RS-564416
RS-564393 a bit smaller
and from DOGM Graphics (nice data-sheet)
Note: there is no built in Alphabet
The display is divided into 8 lines, of 8 pixels, by 128.
This does mean that for graphics, you are bound by an 8, 16, 24 .. pixel high stripe.
I have used SPI, as the MBED is plenty fast enough, and only ends up needing 5 wires, plus 2 power.
CODE:
#include "GLCD-ST7565R.h"
#include "char.h"
#include "mbed.h"
// pin remapping
GLCD_ST7565R::GLCD_ST7565R (PinName mosi , PinName miso, PinName sclk,
PinName GLCD_CS, PinName GLCD_DC, PinName GLCD_Reset) :
// mosi, miso, clk, CS, DC, Reset
_spi (mosi, miso, sclk),
_GLCD_CS (GLCD_CS),
_GLCD_DC (GLCD_DC),
_GLCD_Reset (GLCD_Reset)
{
// Default constructor ..
_normal = 1;
Init_GLCD();
}
/*
//SPI spi(p11, p12, p13); // mosi, miso, sclk
//DigitalOut n_OLED_Reset (p24);
//DigitalOut n_OLED_CS (p25);
//DigitalOut n_OLED_DC (p26);
*/
// ------------------------------------------------------
void GLCD_ST7565R::comm_out (unsigned char command) {
_GLCD_DC = 0;
_GLCD_CS = 0;
_spi.write (command);
_GLCD_CS = 1;
}
// ********************************************************** //
void GLCD_ST7565R::data_out (unsigned char data) {
_GLCD_DC = 1;
_GLCD_CS = 0;
if (_normal)
{
_spi.write (data);
}
else // _invert
{
_spi.write (~data);
}
_GLCD_CS = 1;
}
// ********************************************************** //
void GLCD_ST7565R::Init_GLCD(void) {
_spi.format(8,0);
_spi.frequency(200000);
// send some dummy packets ..
comm_out(0x00);
comm_out(0x00);
// force Hardware reset ..
_GLCD_Reset = 0;
_GLCD_CS = 1;
// reset
wait_ms(200);
_GLCD_Reset = 0;
wait_ms(500);
_GLCD_Reset = 1;
wait_ms(500);
#define RotDisplay
comm_out(0x40); //set command unlock
#ifdef RotDisplay
comm_out(0xa1); //$A0=Normal $A1=Invert akkow sensiable X:Y mapping
comm_out(0xc0 | 0x00); //Select COM output scan direction
#else
comm_out(0xa0); //$A0=Normal $A1=Invert akkow sensiable X:Y mapping
comm_out(0xc0 | 0x08); //Select COM output scan direction
#endif
comm_out(0xa7); //
comm_out(0xa2); //LCD Bias
comm_out(0x2f); //set multiplex ratio
comm_out(0xf8); //Booster Ratio
comm_out(0x00); // 0=2x,3x,4x 1=5x, 3=6x
comm_out(0x27); //V0 (Rb/Ra) ? Contrast
comm_out(0x81); //Electronic VOLUME ($16)
comm_out(0x05); //..value
comm_out(0xac); //Sleep mode ?
comm_out(0x00); //second byte
#ifdef invert
comm_out(0xa4 | 0); //$A0=Normal $A1=Invert(9) 1 = black screen ?? no writing
#else
comm_out(0xa6 | 0); //$A0=Normal $A1=Invert(9)
#endif
cleanDDRAM(0x00);
comm_out(0xaf); //Display = ON
comm_out(0xb0); // page (0..16)
comm_out(0x40); // display start line ($40..$7f)
comm_out(0x10); // Column Address ($10 | MSB) (4-bits)
comm_out(0x00); // ...............($00 | LSB) (4-bits)
}
// ********************************************************** //
void GLCD_ST7565R::GLCD_String (char Coll, char Line, char *Phrase)
{
_col = Coll;
_row = Line;
Line = Line & 0x07;
#ifdef RotDisplay
Coll += 4; // adjust for rotated display ..
#endif
// select ln, coll ..
comm_out(0xb0 | Line); // display start line ($40..$7f) roll ?
comm_out(0x10 | (Coll >> 4) );
comm_out(0x00 | (Coll & 0x0f));
while (*Phrase) {
GLCDCharC_GEN(*Phrase++);
}
}
/* ******************************************************* */
/* ******************************************************* */
// locate ..
void GLCD_ST7565R::GLCD_Locate (char Coll, char Line)
{
_col = Coll;
_row = Line;
Line = Line & 0x07;
#ifdef RotDisplay
Coll += 4; // adjust for rotated display ..
#endif
// select ln, coll ..
comm_out(0xb0 | Line); // display start line ($40..$7f) roll ?
comm_out(0x10 | (Coll >> 4) );
comm_out(0x00 | (Coll & 0x0f));
}
/* ******************************************************* */
/* ******************************************************* */
// printf ..
int GLCD_ST7565R::_putc (int c)
{
GLCDCharC_GEN(c);
return c;
}
int GLCD_ST7565R::_getc()
{
return -1;
}
/* ******************************************************* */
void GLCD_ST7565R::GLCDCharC_GEN (unsigned char Alph) {
unsigned char line, BitsOut;
int pt;
if (Alph < 0x20) Alph = 0x20; // canot display ..
Alph -= 0x20; // array of data starts @ "space" ~ $20 !
//Alph = Alph << 3;
pt = Alph;
pt = pt<< 3;
for (line = 0; line<8; line++)
{
BitsOut = Character8x7[pt | line];
data_out(BitsOut);
_col ++;
// catch for over printing ..
if (_col > 127)
{
_col = 0;
_row++;
_row &= 0x07;
GLCD_Locate(_col, _row);
}
}
// detect if width is low, eg 'i' as opposed to 'H',
// .... only a few char's are shorter, no gain is not high enough.
}
/* ************************************************************** */
void GLCD_ST7565R::GLCD_Bargraph (char Line, char Percent) {
Line = Line & 0x07;
char Coll; // adjust for rotated display ..
#ifdef RotDisplay
Coll = 4;
#else
Coll = 0;
#endif
char Len,ch;
// select ln, coll ..
comm_out(0xb0 | Line); // display start line ($40..$7f) roll ?
comm_out(0x10 | (Coll >> 4) );
comm_out(0x00 | (Coll & 0x0f));
data_out(0x00);
data_out(0x00);
data_out(0x00);
data_out(0x00);
data_out(0x3e);
for (Len = 0; Len < 120; Len++)
{
ch = 0x41;
if (Len < Percent) ch |= 0x3e;
data_out(ch);
}
data_out(0x3e);
}
/* ************************************************************** */
void GLCD_ST7565R::GLCD_Draw_Box (char x, char y, char xx, char yy) {
}
// ********************************************************** //
void GLCD_ST7565R::cleanDDRAM(int pattern) {
int Ln,Col;
for (Ln=0;Ln<8;Ln++) {
comm_out(0xb0|Ln); // display start line ($40..$7f) roll ?
comm_out(0x10);
#ifdef RotDisplay
comm_out(0x04);
#else
comm_out(0x00);
#endif
for (Col=0;Col<128;Col++) {
//data_out(j); wait_ms (30);
data_out(pattern);
//data_out(0x81);
}
}
}
// -----------------------------------------------------------------
void GLCD_ST7565R::DrawBitMap (void) {
}
// ----------------------------------------------------------------
void GLCD_ST7565R::FatalFileWarning(char *Message)
{
cleanDDRAM(0x00);
GLCD_Locate (0,0);
printf(" ** WARNING ** ");
GLCD_Locate (0,2);
printf(" Could not open");
GLCD_Locate (0,4);
printf(" file! ");
GLCD_Locate (0,6);
printf (Message);
}
#ifndef _GLCD_h_
#define _GLCD_h_
#include "mbed.h"
/*
class TextLCD : public Stream {
public:
*/
class GLCD_ST7565R :public Stream {
public:
GLCD_ST7565R (PinName mosi , PinName miso, PinName sclk, PinName GLCD_CS, PinName GLCD_DC, PinName GLCD_Reset);
void cleanDDRAM(int);
void Init_GLCD(void);
void comm_out (unsigned char command);
void data_out (unsigned char data);
void GLCD_String (char px, char py, char *Phrase);
//void (unsigned char Alph);
void GLCDCharC_GEN (unsigned char Alph);
void DrawBitMap (void);
void GLCD_Bargraph (char Line, char Percent);
void GLCD_Draw_Box (char x, char y, char xx, char yy);
void GLCD_Locate (char Coll, char Line);
void FatalFileWarning(char *Message);
protected:
// Stream implementation functions
virtual int _putc (int);
virtual int _getc (void);
int _col;
int _row;
int _normal;
// int printf(const char* format, ...);
//private: // ??
SPI _spi;
DigitalOut _GLCD_CS;
DigitalOut _GLCD_DC;
DigitalOut _GLCD_Reset;
};
#endif
Additional code:
sprintf (String, "/sd/mydir/sdtest.txt" );
FILE *fp = fopen (String, "r");
if(!fp)
{
glcd.FatalFileWarning(String);
}
else
{
// normal operation
}
Pictures as well.
I used a 40 way IDC Cable (e.g. an old Hard Disk Drive cable)
cut down, and the centor 28 conductors soldered to the LCD Leads.
with the outside 4 connectors, (2 each side) going to the LED pins.
Not too clear from the photo, but the capacitors are soldered DIAGONALLY across the pins.
Connections etc., and
EAGLE schematics after that
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Graphic LCD Display ST7565R
Page owner: ceri clatworthy
Created 28 Oct 2010.
Last updated 11 Nov 2010
I have some code for it here.