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johanpret
Joined: 23 Oct 2006
Posts: 33
Location: South Africa
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| OLED driver works at 32 MHz but not at 64 MHz |
 Posted: Wed Nov 22, 2017 9:09 am |
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OLED 128x64 SSD1306 I2C PIC16F1788 driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=52861
I implemented the driver on PIC18f26K80. It work 100% when the internal Clock speed is set to 32 MHZ but when I set to 64MHz the oled does not work.
| Code: | #include <18F26k80.h>
#use delay(internal=32000000)
#use i2c(Master,Slow,sda=PIN_B6,scl=PIN_B7,force_sw) |
Work
| Code: | #include <18F26k80.h>
#use delay(internal=64000000)
#use i2c(Master,Slow,sda=PIN_B6,scl=PIN_B7,force_sw) |
Don't work
Anyone can help?
_________________
Johan Pretorius |
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temtronic
Joined: 01 Jul 2010
Posts: 9229
Location: Greensville,Ontario
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| Posted: Wed Nov 22, 2017 3:27 pm |
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Have you confirmed the basic '1Hz LED' program runs correctly with clock =64MHz ??
If it does...then I'm at a loss to explain the reason.
Jay |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Nov 22, 2017 5:31 pm |
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Have you tried putting a delay at the start of main() ?
Try this:
| Code: | void main()
{
delay_ms(1000);
.
.
.
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temtronic
Joined: 01 Jul 2010
Posts: 9229
Location: Greensville,Ontario
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| Posted: Wed Nov 22, 2017 5:48 pm |
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hmm PCM P is onto something ! ALL LCD modules require some time to 'organize' themselves BEFORE being accessed by micros. Now I made the assumption you already have a preLCDaccess delay. Every one of my programs, even those without LCD modules have a 500ms delay, after all PIC setup is done. After 20 years, it's something I do without even thinking about and wrongfully assume other do as well.
We'd have to see a small program that fails for you.
Jay |
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newguy
Joined: 24 Jun 2004
Posts: 1908
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| Posted: Wed Nov 22, 2017 8:01 pm |
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| temtronic wrote: | | Every one of my programs, even those without LCD modules have a 500ms delay, after all PIC setup is done. After 20 years, it's something I do without even thinking about and wrongfully assume other do as well. |
Me too. EEPROMs also require a bit of a delay; this becomes critical at low ambient temperatures. |
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johanpret
Joined: 23 Oct 2006
Posts: 33
Location: South Africa
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| 64 Mhz clock not working |
| Posted: Thu Nov 23, 2017 12:51 am |
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Yes I use a delay on startup to stabilize supply etc. 64 MHz program is running. I have LED Flashing and it is running. I suspect the timing of the I2C I use software I2C, as the pins I have available on the board I use does not have hardware I2C. I changed the speed of the I2C bus in the # use definition but it does not help. I tested with both drivers for OLED. Both is acting the same 32Mhz Clock work. 64MHz Clock does not work.
Here is the Test Code:
Main Program:
| Code: |
#include <OLED_Test.h>
#include <string.h>
#define CountsPerSecond 100
//display dimensions - the physical LCD
#define S_LCDWIDTH 128
#define S_LCDHEIGHT 64
//Size of graphics 'window' see the graphics section for explanation
#define WINDOW_WIDTH 64
#define WINDOW_HEIGHT 16 //sizes of the graphic window in pixels
//height must be a multiple of 8. //these must now be defined
//#define TEXT_ONLY //If this is defined, gives a smaller text driver only
#define SSDADDR 0x78 //address for the chip - usually 0x7C or 0x78.
#include <string.h>
#include "oled2.c"
byte LedCounter = 0;
byte RX_WifiBuffer[256];
byte SerialWriteIndex = 0,SerialReadIndex=0;
#INT_TIMER0 //Interupt every 128uS
void TIMER0_isr(void)
{
}
#INT_TIMER1 //Interupt Every 10mS
void TIMER1_isr(void)
{
set_timer1(25537);
LedCounter++;
if (LedCounter== 5) output_bit(LED,0);
if (LedCounter>9)
{
output_bit(LED,1);
LedCounter = 0;
}
}
#INT_EXT
void EXT_isr(void)
{
}
#INT_EXT1
void EXT1_isr(void)
{
}
#INT_RDA
void RDA_isr(void)
{
byte RXChar;
RXChar = fgetc(Serial);
RX_WifiBuffer[SerialWriteIndex] = RXChar;
SerialWriteIndex++;
}
#INT_RDA2
void RDA2_isr(void)
{
}
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_INTERNAL );
//setup_lcd(LCD_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_8|RTCC_8_bit); //4.0 ms overflow
setup_timer_1 ( T1_INTERNAL | T1_DIV_BY_4 );
//port_b_pullups(true);
//enable_interrupts(INT_TIMER0);
enable_interrupts(INT_TIMER1);
disable_interrupts(INT_EXT2);
disable_interrupts(INT_EXT3);
disable_interrupts(INT_RB);
enable_interrupts(INT_RDA);
Disable_interrupts(INT_RDA2);
enable_interrupts(GLOBAL);
int8 ctr;
char text[25]; //temporary text buffer
delay_ms(4000); //OLED takes time to wake
//now try to initialise OLED
OLED_commands(init_sequence,sizeof(init_sequence)); //initialise the OLED
while(TRUE)
{
//Now try some text
set=TRUE;
size=NORMAL;
OLED_CLS(); //clear the physical screen
OLED_gotoxy(0,0);
strcpy(text,"1: Yskas Temperatuur 1");
OLED_text(text,strlen(text)); //This is the fastest way to write text
size=LARGE;
OLED_gotoxy(0,1);
strcpy(text,"25.3");
OLED_text(text,strlen(text)); //This is the fastest way to write tex
size=NORMAL;
OLED_gotoxy(10,1);
strcpy(text,"Normal");
OLED_text(text,strlen(text)); //This is the fastest way to write tex
OLED_gotoxy(0,3);
strcpy(text,"2: Yskas Temperatuur 2");
OLED_text(text,strlen(text)); //This is the fastest way to write tex
size=LARGE;
OLED_gotoxy(0,4);
strcpy(text,"-10.2");
OLED_text(text,strlen(text)); //This is the fastest way to write tex
size=NORMAL;
OLED_gotoxy(10,4);
strcpy(text,"Line 6 Text");
OLED_text(text,strlen(text)); //This is the fastest way to write tex
OLED_gotoxy(0,6);
strcpy(text,"Con:Logged In Sig:100%");
OLED_text(text,strlen(text)); //This is the fastest way to write tex
OLED_gotoxy(0,7);
strcpy(text,"Pretoria Universiteit");
OLED_text(text,strlen(text)); //This is the fastest way to write tex
delay_ms(4000); //pause for two seconds
OLED_CLS(); //clear the physical screen
OLED_gotoxy(0,4);
size=LARGE;
OLED_text(text,strlen(text)); //try some large text
delay_ms(2000);
//Now the printf mode
size=LARGE;
//now testing putc
printf(OLED_putc,"\f12345\n\r67890\n\r");
//Note how the line feed moves down by the large line when in
//large mode
delay_ms(2000);
//Now printf in normal mode to the same screen
size=NORMAL;
printf(OLED_putc,"ABCDEFGHI");
delay_ms(2000); //delay again so you can see what it has done
//Now mixed size with a bar graph
size=LARGE;
printf(OLED_putc,"\fV=");
for (ctr=0;ctr<101;ctr++)
{
size=NORMAL;
OLED_gotoxy(4,1);
printf(OLED_putc,"%3d ",ctr);
OLED_gotoxy(1,3);
size=LARGE;
OLED_textbar(ctr);
delay_ms(50); //So you can see what is displayed!...
}
//First try some text
OLED_CLS(); //clear the physical screen
set=TRUE;
clear_window(); //clear the window buffer
OLED_gotoxy(0,0);
strcpy(text,"Hello");
size=NORMAL;
OLED_text(text,strlen(text));
delay_ms(2000);
//now some graphics
line(0,0,64,16); //draw line in window
line(10,10,61,0);//and a second
//now write the window to the screen
draw_window(64,0); //at 64 pixels across and top of screen
delay_ms(2000);
//set=FALSE; //inverted drawing
clear_window(); //clear the window to fully set!
line(0,0,63,0);
line(0,15,63,15);
line(0,0,0,15);
line(63,0,63,15);
//line(20,10,40,10);
//circle(32,8,8,1); //just touch the edge of the window
draw_window(0,0); //put this window half way down screen
OLED_gotoxy(0,0);
strcpy(text,"Hello");
size=NORMAL;
OLED_text(text,strlen(text));
delay_ms(2000);
};
}
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Oled_Test.h
| Code: |
#include <18F26k80.h>
#device ADC=12
#FUSES PUT //Power Up Timer
#FUSES NOMCLR //Master Clear pin enabled
#FUSES NOWDT
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOCPD //No EE protection
#FUSES INTRC_IO //I/O function on OSC2
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES NOWRT //Program memory not write protected
#FUSES CANB
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NOBROWNOUT
#FUSES BORV30 //Brownout reset at 2.5V
#FUSES PLLEN
//#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#use delay(internal=32000000)
//#use delay(internal=64000000)
#use STANDARD_IO( A )
#use STANDARD_IO( B )
#use STANDARD_IO( C )
#use STANDARD_IO( E )
#define I2C_Mem_WP PIN_A0
#define I2C_SCL PIN_A1
#define I2C_SDA PIN_A2
#define LED PIN_A3
#define INPUT1 PIN_B0
#define INPUT2 PIN_B1
#define INPUT3 PIN_B4
#define INPUT4 PIN_A5
#define TOUCH_PIN1 PIN_B0
#define TOUCH_PIN2 PIN_B1
#define TOUCH_PIN3 PIN_A5
#define TOUCH_PIN4 PIN_A5
//Johan Geyser 2
//#define TOUCH_PIN1 PIN_B1
//#define TOUCH_PIN2 PIN_B1
//#define TOUCH_PIN3 PIN_B0
//#define TOUCH_PIN4 PIN_B0
#define Output1 PIN_C1
#define Buzzer PIN_C1
#define Output2 PIN_C0
#define Output3 PIN_A6
#define Output4 PIN_A7
#define Keypad_Green PIN_A7
#define CAN_TX PIN_B2
#define CAN_RX PIN_B3
#define TX1 PIN_C6
#define RX1 PIN_C7
#define WifiReset PIN_C2
#define TX2 PIN_B6
#define RX2 PIN_B7
#define WaterPresent PIN_E3
#define AD7794_CS PIN_B5
#define AD7794_SCLK PIN_C3
#define AD7794_DIN PIN_C4
#define AD7794_DOUT PIN_C5
#use rs232(baud=115200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=Serial,errors)
//#use rs232(baud=115200,parity=N,xmit=PIN_B6,rcv=PIN_B7,bits=8,stream=Serial,errors)
//#use I2C(master, sda=PIN_A2, scl=PIN_A1)
#use i2c(Master,Slow,sda=PIN_B6,scl=PIN_B7,force_sw)
#priority RDA,Timer1
|
Oled2.c
| Code: |
/*
Now the big limitation.....
In serial modes (SPI/I2C), this chip provides no ability to read back it's RAM.
So we have a problem. If we want to write a line across the screen, and leave
another line that is already there 'undestroyed' where they cross, how can we
'know' the other line is there?. Basically the host chip needs to have a copy
of the display memory so it can hold a copy of any graphics and know what is
going on. Problem is that this is just not possible, on a PIC with limited RAM.
So this driver works by overwriting for all text writes....
But see further down for the 'exception' to this.
*/
//It is most efficiently used by preparing the whole line of text first
//and then sending this - it then uses a 'burst' transmission, to give very
//fast updates. It does offer a 'putc' though, but this is slower.
//It does not properly handle wrapping at the end of the line.
//The putc function adds support for \n, \r, and \f.
//Functions:
// OLED_CLS(); //clears the screen
// OLED_gotoxy(x, y); //goto column/row 0-20 for the column
// //0-7 for the row
// OLED_text(*text, number);
// //This sends 'number' bytes from the array
// //pointed to by 'text', to the display
// OLED_putc(c); //sends 'c' to the display. Beware though
// //if you go beyond the end of the line
// //- you'll get partial characters....
// OLED_textbar(width); //Displays a bargraph. With width=50
// //you get a 50:50 display of bar/void.
//Two global variables affect how things are displayed.
// size=NORMAL;
// size=LARGE; //switches between showing 21*8 & 10*4
// size=DOUBLE_HEIGHT //Gives 21*4 - great for the bargraph
// set=TRUE; //default. Pixels are 'set' when written, so
// //turn on.
// set=FALSE; //all write functions now invert.
//The CLS will now set the screen white. Text characters print in black
//Then the second part of the driver is a 'window' driver. With this you can
//define a small graphic 'window', and draw things into this. This can then be
//rapidly copied to the display. So you could (for instance), plot a tiny graph,
//end then draw this on the display.
//The window must be a multiple of 8 pixels high, and can only be placed
//at a 'text' location, so you can't put it (say) 12 pixels down the screen,
//but only 8, 16, 24 etc..
//The size of the window determines how much RAM is used. So a 64*16 window
//uses 128 bytes of RAM (64*16/8).
//Neat thing is though, that you can draw an image on the window, put this on
//the screen, and then draw a second image, and put this somewhere else,
//without using any more memory. At the moment, I have only implemented two
//functions to draw to this window.
//If you don't want the graphic ability, if you #define TEXT_ONLY, then only
//the text mode driver will be loaded.
//With the graphic driver being used, the following extra functions are
//available:
// clear_window(); //clears all pixels 'black' (if set==TRUE), or white.
// set_pixel(x, y); //sets a pixel at x,y in the window.
// //x=0 to WINDOW_WIDTH-1 (left to right)
// //y=0 to WINDOW_HEIGHT-1 (top to bottom)
// line(x1, y1, x2, y2); //draws a line from x1,y1 to x2, y2
// rect(x1, y1, x2, y2); //draws a rectangle
// circle(x, y, radius, fill); //draws a circle
// //This draws a circle of radius 'radius' centred at x,y. If 'fill' is
// //true this is filled....
//
// draw_window(x, int8 y); //This draws the window onto the screen at
// //x=0 to 128, y=0 to 7.
//What you do is simply draw the shape you want into the window, and then
//this can be drawn onto the screen.
//I have not included font drawing, since this takes a lot more space....
//'set' again controls whether a pen, or eraser is used. So (for example), if you
//wanted a 'thick' circle, you could either draw several using the pen,
//without 'fill' enabled, or could draw one with fill, then change set to
//false, and draw a smaller one, to give a thick ring.
#define COMMAND_ONLY 0b00000000 //next byte is a command only
#define DATA_ONLY 0b01000000 //next byte is data
//directly from the data sheet - commands - not all used
#define S_EXTERNALVCC 0x1
#define S_SWITCHCAPVCC 0x2
#define S_SETLOWCOLUMN 0x00
#define S_SETHIGHCOLUMN 0x10
#define S_MEMORYMODE 0x20
#define S_COLUMNADDR 0x21
#define S_PAGEADDR 0x22
#define S_SETSTARTLINE 0x40
#define S_SETCONTRAST 0x81
#define S_CHARGEPUMP 0x8D
#define S_SEGREMAP 0xA0
#define S_DISPLAYALLON_RESUME 0xA4
#define S_DISPLAYALLON 0xA5
#define S_NORMALDISPLAY 0xA6
#define S_INVERTDISPLAY 0xA7
#define S_SETMULTIPLEX 0xA8
#define S_DISPLAYOFF 0xAE
#define S_DISPLAYON 0xAF
#define S_COMSCANINC 0xC0
#define S_COMSCANDEC 0xC8
#define S_SETDISPLAYOFFSET 0xD3
#define S_SETCOMPINS 0xDA
#define S_SETVCOMDETECT 0xDB
#define S_SETDISPLAYCLOCKDIV 0xD5
#define S_SETPRECHARGE 0xD9
#define DIV_RATIO 0x80 //recommended ratio
#define MULTIPLEX 0x3F //and multiplex
#define INT_VCC 0x14
//Font 6*8 - slightly clearer than most fonts this size.
ROM BYTE font[] =
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Code for char
0x00, 0x00, 0xBE, 0x00, 0x00, 0x00, // Code for char !
0x00, 0x00, 0x03, 0x00, 0x03, 0x00, // Code for char "
0x50, 0xF8, 0x50, 0xF8, 0x50, 0x00, // Code for char #
0x48, 0x54, 0xFE, 0x54, 0x24, 0x00, // Code for char $
0x98, 0x58, 0x20, 0xD0, 0xC8, 0x00, // Code for char %
0x60, 0x9C, 0xAA, 0x44, 0x80, 0x00, // Code for char &
0x00, 0x00, 0x00, 0x03, 0x00, 0x00, // Code for char '
0x00, 0x38, 0x44, 0x82, 0x00, 0x00, // Code for char (
0x00, 0x82, 0x44, 0x38, 0x00, 0x00, // Code for char )
0x02, 0x06, 0x03, 0x06, 0x02, 0x00, // Code for char *
0x10, 0x10, 0x7C, 0x10, 0x10, 0x00, // Code for char +
0xA0, 0x60, 0x00, 0x00, 0x00, 0x00, // Code for char ,
0x10, 0x10, 0x10, 0x10, 0x10, 0x00, // Code for char -
0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00, // Code for char .
0x80, 0x40, 0x20, 0x10, 0x08, 0x00, // Code for char /
0x7C, 0xA2, 0x92, 0x8A, 0x7C, 0x00, // Code for char 0
0x00, 0x84, 0xFE, 0x80, 0x00, 0x00, // Code for char 1
0xC4, 0xA2, 0x92, 0x92, 0x8C, 0x00, // Code for char 2
0x44, 0x82, 0x92, 0x92, 0x6C, 0x00, // Code for char 3
0x18, 0x14, 0x12, 0xFE, 0x10, 0x00, // Code for char 4
0x9E, 0x92, 0x92, 0x92, 0x62, 0x00, // Code for char 5
0x7C, 0x92, 0x92, 0x92, 0x64, 0x00, // Code for char 6
0x06, 0x02, 0xE2, 0x12, 0x0E, 0x00, // Code for char 7
0x6C, 0x92, 0x92, 0x92, 0x6C, 0x00, // Code for char 8
0x4C, 0x92, 0x92, 0x92, 0x7C, 0x00, // Code for char 9
0xCC, 0xCC, 0x00, 0x00, 0x00, 0x00, // Code for char :
0xAC, 0x6C, 0x00, 0x00, 0x00, 0x00, // Code for char ;
0x00, 0x10, 0x28, 0x44, 0x82, 0x00, // Code for char <
0x48, 0x48, 0x48, 0x48, 0x48, 0x00, // Code for char =
0x00, 0x82, 0x44, 0x28, 0x10, 0x00, // Code for char >
0x04, 0x02, 0xB2, 0x12, 0x0C, 0x00, // Code for char ?
0x7C, 0x82, 0xBA, 0xAA, 0xBC, 0x00, // Code for char @
0xF8, 0x14, 0x12, 0x14, 0xF8, 0x00, // Code for char A
0xFE, 0x92, 0x92, 0x92, 0x6C, 0x00, // Code for char B
0x7C, 0x82, 0x82, 0x82, 0x44, 0x00, // Code for char C
0xFE, 0x82, 0x82, 0x44, 0x38, 0x00, // Code for char D
0xFE, 0x92, 0x92, 0x82, 0x82, 0x00, // Code for char E
0xFE, 0x12, 0x12, 0x02, 0x02, 0x00, // Code for char F
0x7C, 0x82, 0x92, 0x92, 0xF4, 0x00, // Code for char G
0xFE, 0x10, 0x10, 0x10, 0xFE, 0x00, // Code for char H
0x00, 0x82, 0xFE, 0x82, 0x00, 0x00, // Code for char I
0x60, 0x80, 0x80, 0x80, 0x7E, 0x00, // Code for char J
0xFE, 0x10, 0x18, 0x24, 0xC2, 0x00, // Code for char K
0xFE, 0x80, 0x80, 0x80, 0x80, 0x00, // Code for char L
0xFE, 0x04, 0x38, 0x04, 0xFE, 0x00, // Code for char M
0xFE, 0x04, 0x08, 0x10, 0xFE, 0x00, // Code for char N
0x7C, 0x82, 0x82, 0x82, 0x7C, 0x00, // Code for char O
0xFE, 0x12, 0x12, 0x12, 0x0C, 0x00, // Code for char P
0x7C, 0x82, 0xA2, 0xC2, 0xFC, 0x00, // Code for char Q
0xFE, 0x12, 0x12, 0x12, 0xEC, 0x00, // Code for char R
0x4C, 0x92, 0x92, 0x92, 0x64, 0x00, // Code for char S
0x02, 0x02, 0xFE, 0x02, 0x02, 0x00, // Code for char T
0x7E, 0x80, 0x80, 0x80, 0x7E, 0x00, // Code for char U
0x3E, 0x40, 0x80, 0x40, 0x3E, 0x00, // Code for char V
0xFE, 0x80, 0x70, 0x80, 0xFE, 0x00, // Code for char W
0xC6, 0x28, 0x10, 0x28, 0xC6, 0x00, // Code for char X
0x06, 0x08, 0xF0, 0x08, 0x06, 0x00, // Code for char Y
0xC2, 0xA2, 0x92, 0x8A, 0x86, 0x00, // Code for char Z
0x00, 0xFE, 0x82, 0x82, 0x00, 0x00, // Code for char [
0x08, 0x10, 0x20, 0x40, 0x80, 0x00, // Code for char BackSlash
0x00, 0x82, 0x82, 0xFE, 0x00, 0x00, // Code for char ]
0x00, 0x08, 0x04, 0x02, 0x04, 0x08, // Code for char ^
0x80, 0x80, 0x80, 0x80, 0x80, 0x00, // Code for char _
0x00, 0x00, 0x02, 0x04, 0x00, 0x00, // Code for char `
0x40, 0xA8, 0xA8, 0xA8, 0xF0, 0x00, // Code for char a
0xFE, 0x88, 0x88, 0x88, 0x70, 0x00, // Code for char b
0x70, 0x88, 0x88, 0x88, 0x10, 0x00, // Code for char c
0x70, 0x88, 0x88, 0x88, 0xFE, 0x00, // Code for char d
0x70, 0xA8, 0xA8, 0xA8, 0x30, 0x00, // Code for char e
0x10, 0xFC, 0x12, 0x12, 0x04, 0x00, // Code for char f
0x90, 0xA8, 0xA8, 0xA8, 0x70, 0x00, // Code for char g
0xFE, 0x10, 0x10, 0x10, 0xE0, 0x00, // Code for char h
0x00, 0x90, 0xF4, 0x80, 0x00, 0x00, // Code for char i
0x40, 0x80, 0x80, 0x90, 0x74, 0x00, // Code for char j
0xFE, 0x20, 0x50, 0x88, 0x00, 0x00, // Code for char k
0x7E, 0x80, 0x80, 0x00, 0x00, 0x00, // Code for char l
0xF8, 0x08, 0x70, 0x08, 0xF0, 0x00, // Code for char m
0xF8, 0x08, 0x08, 0x08, 0xF0, 0x00, // Code for char n
0x70, 0x88, 0x88, 0x88, 0x70, 0x00, // Code for char o
0xF8, 0x28, 0x28, 0x28, 0x10, 0x00, // Code for char p
0x10, 0x28, 0x28, 0xF8, 0x80, 0x00, // Code for char q
0xF8, 0x08, 0x08, 0x08, 0x10, 0x00, // Code for char r
0x90, 0xA8, 0xA8, 0xA8, 0x48, 0x00, // Code for char s
0x08, 0x08, 0xFE, 0x88, 0x88, 0x00, // Code for char t
0x78, 0x80, 0x80, 0x80, 0xF8, 0x00, // Code for char u
0x38, 0x40, 0x80, 0x40, 0x38, 0x00, // Code for char v
0xF8, 0x80, 0x70, 0x80, 0xF8, 0x00, // Code for char w
0x88, 0x50, 0x20, 0x50, 0x88, 0x00, // Code for char x
0x18, 0xA0, 0xA0, 0xA0, 0x78, 0x00, // Code for char y
0x88, 0xC8, 0xA8, 0x98, 0x88, 0x00, // Code for char z
0x00, 0x10, 0x6C, 0x82, 0x00, 0x00, // Code for char {
0x00, 0x00, 0xFE, 0x00, 0x00, 0x00, // Code for char |
0x00, 0x82, 0x6C, 0x10, 0x00, 0x00, // Code for char }
0x00, 0x08, 0x04, 0x08, 0x10, 0x08, // Code for char ~
0x7C, 0x7C, 0x00, 0x00, 0x00, 0x00, // Code for char
//Characters 32 to 127
//The next thirteen characters are above 127, and give the shapes used for
//the bar graph capability - remove if not needed
0x82, 0x82, 0x82, 0x82, 0x82, 0x82, //top and bottom bars only 128
0xFE, 0x82, 0x82, 0x82, 0x82, 0x82, //Open for bar 129
0xFE, 0xFE, 0x82, 0x82, 0x82, 0x82, //second bar
0xFE, 0xFE, 0xFE, 0x82, 0x82, 0x82,
0xFE, 0xFE, 0xFE, 0xFE, 0x82, 0x82,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0x82,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, //Full block for bar 134
0x82, 0x82, 0x82, 0x82, 0x82, 0xFE, //final one cloing shape 135
0xFE, 0x82, 0x82, 0x82, 0x82, 0xFE, //single left and right
0xFE, 0xFE, 0x82, 0x82, 0x82, 0xFE,
0xFE, 0xFE, 0xFE, 0x82, 0x82, 0xFE, //Now working in from the left
0xFE, 0xFE, 0xFE, 0xFE, 0x82, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE //final one cloing shape 140
};
//Character 140
ROM BYTE init_sequence[] = S_DISPLAYOFF,
S_SETDISPLAYCLOCKDIV,
DIV_RATIO,
S_SETMULTIPLEX,
MULTIPLEX,
S_SETDISPLAYOFFSET,
0, // no offset
S_SETSTARTLINE,
S_CHARGEPUMP,
INT_VCC, // using internal VCC
S_MEMORYMODE, //Since byte is vertical writing column by column
0, // default horizontal addressing
(S_SEGREMAP | 0x1), // rotate screen 180
S_COMSCANDEC,
S_SETCOMPINS,
0x12,
S_SETCONTRAST,
0xCF, //experiment....
S_SETPRECHARGE,
0xF1,
S_SETVCOMDETECT,
0x40,
S_DISPLAYALLON_RESUME,
S_NORMALDISPLAY,
S_DISPLAYON; //switch on OLED
//Initilalisation sequence
#define NORMAL 0
#define DOUBLE_HEIGHT 1
#define DOUBLE_WIDTH 2
#define LARGE DOUBLE_HEIGHT+DOUBLE_WIDTH
unsigned int8 O_current_col,O_current_row; //where text is currently 'working'
int8 size=NORMAL;
//Global flag for drawing mode
int1 set=TRUE; //allow funstions to set or reset - inverts drawing functions
#ifndef TEXT_ONLY
unsigned int8 window_buffer[WINDOW_WIDTH*WINDOW_HEIGHT/8];
//so with the example given, 128 bytes of RAM - much more practical on small chips!...
//This is the 'graphic window' buffer, so not needed for text only
#endif
void OLED_commands(rom unsigned int8 * commands, unsigned int8 number)
//send a multiple command, or commands to the display - number says how many
//from a ROM buffer
{
int8 ctr; //counter for the transmission
i2c_start ();
i2c_write (SSDADDR); //select the display
i2c_write (COMMAND_ONLY); //we are sending a command
for (ctr=0;ctr<number;ctr++)
{
I2c_write(commands[ctr]);
}
i2c_stop();
}
void OLED_data(unsigned int8 * data, unsigned int8 number)
//send 'number' bytes of data to display - from RAM
{
int8 ctr;
i2c_start ();
i2c_write (SSDADDR); //select the display
i2c_write (DATA_ONLY); //we are sending data(s)
for (ctr=0;ctr<number;ctr++)
i2c_write(data[ctr]); //send the byte(s)
i2c_stop ();
}
void OLED_address(unsigned int8 x, unsigned int8 y)
{
//routine to move the memory pointers to x,y.
//x is 0 to 127 (column), y (row) is 0 to 7 (page only)
i2c_start();
i2c_write(SSDADDR); //select the display
i2c_write(COMMAND_ONLY); //we are sending command(s)
i2c_write(S_COLUMNADDR);
i2c_write(x); //send the byte(s)
i2c_write(S_LCDWIDTH-1); //maximum width
i2c_write(S_PAGEADDR);
i2c_write(y);
i2c_write((S_LCDHEIGHT/8)-1);
i2c_stop();
}
void OLED_gotoxy(unsigned int8 x, unsigned int8 y)
{
//text x,y position bases on 8 lines/character and 6 columsn
//0 to 20 columns, 0 to 7 rows
if (x>(S_LCDWIDTH/6)-1) return;
if (y>(S_LCDHEIGHT/8)-1) return;
O_current_col=x; //efficient *6
O_current_row=y;
OLED_address((unsigned int16)x*4+(unsigned int16)x*2,y); //position display
}
void OLED_CLS(void)
{
unsigned int16 count;
//Just fill the memory with zeros
OLED_address(0,0); //take the addresses back to 0,0
i2c_start();
i2c_write(SSDADDR); //select the display
i2c_write(DATA_ONLY); //we are sending data(s)
for (count=0;count<(S_LCDWIDTH*S_LCDHEIGHT/8);count++)
if (set)
i2c_write (0); //send 1024 zeros
else
i2c_write(255); //or the inverse
i2c_stop ();
OLED_gotoxy(0,0); //and text back to the top corner
}
//Macros to efficiently double bits from a nibble
#define DOUBLE_BIT(N, S, D) if (bit_test(S,N)) { bit_set(D,(N*2)); bit_set(D,(N*2)+1); }
#define DOUBLE_B_HIGH(N, S, D) if (bit_test(S,N+4)) { bit_set(D,(N*2)); bit_set(D,(N*2)+1); }
void invert(unsigned int8 * buffer, unsigned int8 number) //routine to invert
{//data when'set==FALSE'
do
{
*buffer^=0xFF;
buffer++;
} while(--number); //invert all the bits in the buffer
}
void OLED_text(unsigned int8 * text, unsigned int8 number)
{
unsigned int8 ctr=0, cols[12], tchr, width, inc_col, inc_row;
unsigned int16 temp;
//size allows double height & double width
//Here double height/width
//for this I have to do two transfers each of double the amount of data
//and reposition between each
if (size & DOUBLE_WIDTH)
{
width=12;
inc_col=2;
}
else
{
width=6;
inc_col=1;
}
if (size & DOUBLE_HEIGHT)
inc_row=TRUE;
else
inc_row=FALSE;
do {
temp=(*text)-32;
if (temp>108)
temp=0; //block illegal characters
temp=((unsigned int16)temp*2)+((unsigned int16)temp*4); //efficient *6
for (ctr=0;ctr<width;ctr+=inc_col) //for 6 or 12 columns
{
cols[ctr]=0;
tchr=font[temp++]; //one byte of character from the font
if (inc_row)
{
DOUBLE_BIT(0,tchr,cols[ctr])
DOUBLE_BIT(1,tchr,cols[ctr])
DOUBLE_BIT(2,tchr,cols[ctr])
DOUBLE_BIT(3,tchr,cols[ctr])
} //efficently double the bits from the low nibble
else
cols[ctr]=tchr;
if (size & DOUBLE_WIDTH)
cols[ctr+1]=cols[ctr]; //duplicate the byte
}
if (size & DOUBLE_WIDTH)
{
if (set==FALSE)
invert(cols,12);
//Now send the twelve bytes for the first row
OLED_data(cols,12);
}
else
{
if (set==FALSE)
invert(cols,6);
//Now send the six bytes for the row
OLED_data(cols,6);
}
//now repeat for the second nibble if DOUBLE_HEIGHT
if (inc_row)
{
temp-=6; //back to the start of the font character
OLED_address((unsigned int16)O_current_col*4+O_current_col*2,O_current_row+1); //next row
for (ctr=0;ctr<width;ctr+=inc_col) //for six double columns
{
cols[ctr]=0;
tchr=font[temp++]; //one byte of character from the font
DOUBLE_B_HIGH(0,tchr,cols[ctr])
DOUBLE_B_HIGH(1,tchr,cols[ctr])
DOUBLE_B_HIGH(2,tchr,cols[ctr])
DOUBLE_B_HIGH(3,tchr,cols[ctr])
//efficently double the bits from the high nibble
if (size & DOUBLE_WIDTH)
cols[ctr+1]=cols[ctr]; //duplicate the byte if double_width
}
if (size & DOUBLE_WIDTH)
{
if (set==FALSE)
invert(cols,12);
//Now send the twelve bytes for the first row
OLED_data(cols,12);
}
else
{
if (set==FALSE)
invert(cols,6);
//Now send the six bytes for the row
OLED_data(cols,6);
}
}
//Now because I'll be in the wrong position (may be one line down)
//have to re-locate
O_current_col+=inc_col;
OLED_address((unsigned int16)O_current_col*4+O_current_col*2,O_current_row); //ready for next character
text++; //and select the next character
} while (--number); //and on to the next character
}
void OLED_putc(unsigned int8 chr)
{
//this is a putc wrapper for the text function - note much slower
//than sending the entire line directly
if (chr=='\f')
{
OLED_CLS(); //handle Clear screen (form feed)
return;
}
if (chr=='\r')
{
OLED_gotoxy(0,O_current_row); //carriage return
return;
}
if (chr=='\n')
{
if (size==NORMAL)
OLED_gotoxy(O_current_col,O_current_row+1);
else
OLED_gotoxy(O_current_col,O_current_row+2);
return;
}
OLED_text(&chr,1);
}
void OLED_textbar(unsigned int8 width)
{
//This draws a bar graph using text characters
int8 ctr;
unsigned int8 bar[9];
//graph is 0 to 102 (near to 100...).
//prints at current text location.
width/=2;
width+=1; //ensure >0
if (width>52)
width=53;
for (ctr=0;ctr<8;ctr++)
{
if (width>6)
{
bar[ctr]=134; //full bar
width-=6;
}
else
{
bar[ctr]=128+width; //partial bars
width=0;
}
}
//now handle the right hand end of the bar
bar[8]=135+width;
OLED_text(bar,9);
}
//Now comes the 'exception' part to the driver
//Basic line & circle code writing to a small _window_ that can then
//be burst transmitted to the LED. Neat thing is that the same window
//can be used multiple times. So (for instance) you could write text on the
//left of the display, then have a 64*32 window. Draw something into this
//and display it at 64, 0 (text row) on the display, then draw something
//different (using the same window), and put this at 64, 4. The location
//the window is drawn has to be a byte boundary (so 0 to 7, for 0 to 63
//on the display.
//The sequence would be clear_window, line, circle etc.. Then draw_window(x,y)
//If you don't want to use the smace for this, then #define TEXT_ONLY at the start
//of the code
#ifndef TEXT_ONLY
void clear_window(void)
{
memset(window_buffer,(set)?0:255,WINDOW_WIDTH*WINDOW_HEIGHT/8); //clear the buffer
}
//Basic pixel routine
#inline
void set_pixel(unsigned int8 x, unsigned int8 y)
{
unsigned int16 locn; //This can be int8, if buffer is restricted to max 256 bytes
//potentially slightly faster. However 1616 is 'generic'.
if (x>=WINDOW_WIDTH) return;
if (y>=WINDOW_HEIGHT) return; //Limit check - ensures I do not try to write
//outside buffer boundaries
locn=((y/8)*WINDOW_WIDTH)+x; //location in buffer
//handle setting or resetting the pixel according to flag 'set'
if (set)
bit_set(window_buffer[locn],(y & 7)); //set the bit (to 1)
else
bit_clear(window_buffer[locn],(y & 7)); //set the bit (to 0)
}
//efficient line routine
void line(unsigned int8 x1, unsigned int8 y1, unsigned int8 x2, unsigned int8 y2)
{
unsigned int16 i;
int1 _plot;
signed int16 _dx,_dy;
unsigned int16 _ix,_iy,_inc,_plotx,_ploty,_x,_y;
//line from X1,Y1 to X2,Y2
//first the differences between the coordinate pairs
_dx=(signed int16) x2-x1;
_dy=(signed int16) y2-y1;
// ix & iy are the absolute increments required
_ix=(_dx<0)?(-_dx):_dx;
_iy=(_dy<0)?(-_dy):_dy;
// we must step the longest length (x or y)
_inc=(_ix>_iy)?_ix:_iy;
// make dx and dy the step required.
if (_dx>0) _dx=1; else if (_dx<0) _dx=-1;
if (_dy>0) _dy=1; else if (_dy<0) _dy=-1;
// actual plotting points
_plotx=x1;
_ploty=y1;
// start at 0
_x=0;
_y=0;
// set endpoint
set_pixel(_plotx,_ploty);
/* we implement Bressenhams algorithm for a line using integer steps
and only plotting the point when we get to a new co-ord pair */
for (i=0;i<=_inc;++i)
{
_x += _ix;
_y += _iy;
// do not plot yet
_plot=FALSE;
//if we are at a new pair - set the plot flag and increment
//the phsical plotting point
if (_x > _inc)
{
_plot = TRUE;
_x -= _inc;
_plotx += _dx;
}
if (_y > _inc)
{
_plot = TRUE;
_y -= _inc;
_ploty += _dy;
}
// now plot the point
if (_plot)
{
set_pixel(_plotx,_ploty); //this automatically handles set/reset
}
}
}
void rect(unsigned int8 x1, unsigned int8 y1, unsigned int8 x2, unsigned int8 y2)
{
//outline a rectangle
line(x1, y1, x2, y1); //Just draw four sides
line(x1, y2, x2, y2);
line(x1, y1, x1, y2);
line(x2, y1, x2, y2);
}
void circle(unsigned int8 x, unsigned int8 y, unsigned int8 radius, int1 fill)
{
signed int8 a, b, P;
a = 0;
b = radius;
P = 1 - radius;
do
{
if(fill)
{
line(x-a, y+b, x+a, y+b);
line(x-a, y-b, x+a, y-b);
line(x-b, y+a, x+b, y+a);
line(x-b, y-a, x+b, y-a); //inefficient but easy to code....
}
else
{
set_pixel(a+x, b+y);
set_pixel(b+x, a+y);
set_pixel(x-a, b+y);
set_pixel(x-b, a+y);
set_pixel(b+x, y-a);
set_pixel(a+x, y-b);
set_pixel(x-a, y-b);
set_pixel(x-b, y-a); //othewise draw the octant points
}
if(P < 0)
P += 3 + 2 * a++;
else
P += 5 + 2 * (a++ - b--);
} while(a <= b);
}
void draw_window(unsigned int8 x, unsigned int8 y)
{
unsigned int8 yctr;
unsigned int16 transfer=WINDOW_WIDTH;
//routine to copy the window to the display.
//x is in pixels, y in bytes (0 to 8). Uses burst transmission for each line
if ((x+transfer)>=S_LCDWIDTH)
{
//here the window would go off the edge of the screen...
transfer=(S_LCDWIDTH-1)-x;
}
for (yctr=0;yctr<(WINDOW_HEIGHT/8);yctr++)
{
if (y+yctr>7) return; //off the end of RAM
OLED_address(x,y+yctr); //position to the byte at the start of the line
//transfer the line
OLED_data(window_buffer+((unsigned int16)yctr*WINDOW_WIDTH),transfer);
//again int16 only needed here if buffer>256 bytes
}
}
#endif |
_________________
Johan Pretorius |
|
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Ttelmah
Joined: 11 Mar 2010
Posts: 19520
|
|
| Posted: Thu Nov 23, 2017 1:27 am |
|
|
First, what resistors are you using on the I2C bus?. Though the bus speed is nominally the same, the PIC itself will be testing the ACK bit quicker at the faster clock rate. Makes getting the edges fast more important. This is a 3.3v device, so the resistors need to be smaller than are commonly used. I'd suggest 1.5KR.
Then, add a tiny delay after each I2c_stop command.
The chip has a _minimum_ of 1.3uSec required between a stop, and a successive start. Where the writes are sequential, the simple time delays of the PIC are enough to provide this at lower speeds, but at 16MIPS, I can easily see the PIC generating the next start too soon.
So, wherever there is an I2C_stop in the code, replace this with:
| Code: |
I2C_stop();
delay_us(1);
|
Which will ensure this timing is met. |
|
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
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| Posted: Thu Nov 23, 2017 1:37 am |
|
|
The SSD1306 data sheet says there must be a minimum of 1.3us between
i2c transmissions. This is the delay time between the i2c_stop() and
the next i2c_start(). It's possible that you are violating this specification
when you run at 64 MHz. At that speed, there are 16 instructions per
usec. In 1.3us, there are about 21 instructions.
See the tIdle time parameter on page 54 of the SSD1306 data sheet:
https://www.crystalfontz.com/controllers/SolomonSystech/SSD1306/339/
As an experiment, you could add a short delay after the i2c_stop()
in every routine, as shown in bold below:
| Quote: |
i2c_start();
.
.
.
i2c_stop();
delay_us(2);
|
|
|
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Ttelmah
Joined: 11 Mar 2010
Posts: 19520
|
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| Posted: Thu Nov 23, 2017 1:49 am |
|
|
Two minds with the same thought PCM!... 
I just posted this, but given that the delay was enough at 32Mhz, felt that the code must be giving perhaps a uSec of delay already even at the fast rate, so adding an extra uSec should be all that is needed.
It's one of only two places where the speed of the code would affect the timings. The other is internal into the actual I2C transactions, where the code 'polls' the clock line just one instruction after the last edge to see if the remote chip is clock stretching. |
|
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johanpret
Joined: 23 Oct 2006
Posts: 33
Location: South Africa
|
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| Posted: Thu Nov 23, 2017 3:25 am |
|
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Let me try that. I will give feedback.
Johan
_________________
Johan Pretorius |
|
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johanpret
Joined: 23 Oct 2006
Posts: 33
Location: South Africa
|
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| Posted: Thu Nov 23, 2017 3:45 am |
|
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Does not work. Added delays after all I2c_Stop - 2uS, I2C_Write - 2uS and I2C_Stop - 50uS.
Does not help. Only thing left is I2C speed of bits.
| Code: |
void OLED_commands(rom unsigned int8 * commands, unsigned int8 number)
//send a multiple command, or commands to the display - number says how many
//from a ROM buffer
{
int8 ctr; //counter for the transmission
i2c_start ();
delay_us(2);
i2c_write (SSDADDR); //select the display
delay_us(2);
i2c_write (COMMAND_ONLY); //we are sending a command
delay_us(2);
for (ctr=0;ctr<number;ctr++)
{
I2c_write(commands[ctr]);
delay_us(2);
}
i2c_stop();
delay_us(50);
}
void OLED_data(unsigned int8 * data, unsigned int8 number)
//send 'number' bytes of data to display - from RAM
{
int8 ctr;
i2c_start ();
delay_us(2);
i2c_write (SSDADDR); //select the display
delay_us(2);
i2c_write (DATA_ONLY); //we are sending data(s)
delay_us(2);
for (ctr=0;ctr<number;ctr++)
{
i2c_write(data[ctr]); //send the byte(s)
delay_us(2);
}
i2c_stop ();
delay_us(50);
}
void OLED_address(unsigned int8 x, unsigned int8 y)
{
//routine to move the memory pointers to x,y.
//x is 0 to 127 (column), y (row) is 0 to 7 (page only)
i2c_start();
delay_us(2);
i2c_write(SSDADDR); //select the display
delay_us(2);
i2c_write(COMMAND_ONLY); //we are sending command(s)
delay_us(2);
i2c_write(S_COLUMNADDR);
delay_us(2);
i2c_write(x); //send the byte(s)
delay_us(2);
i2c_write(S_LCDWIDTH-1); //maximum width
delay_us(2);
i2c_write(S_PAGEADDR);
delay_us(2);
i2c_write(y);
delay_us(2);
i2c_write((S_LCDHEIGHT/8)-1);
delay_us(2);
i2c_stop();
delay_us(50);
} |
_________________
Johan Pretorius |
|
|
johanpret
Joined: 23 Oct 2006
Posts: 33
Location: South Africa
|
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| Posted: Thu Nov 23, 2017 3:47 am |
|
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I think it must be a bug in the software I2C library. What do u think. I submitted to CCS.
_________________
Johan Pretorius |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19520
|
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| Posted: Thu Nov 23, 2017 4:33 am |
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There are lots of other things it could be.
As already raised, what pull ups are you using?.
Then how is the processor powered and smoothed?. There are several threads on the MicroChip forum with people having problems at 64MHz, which came down to inadequate local decoupling. The instantaneous demands on the supply pins shoot up when you run at 64MHz.
In the data sheet. Section 2. Do you have the recommended minimum connections as shown, particularly:
"The use of decoupling capacitors on every pair of
power supply pins, such as VDD, VSS, AVDD and
AVSS, is required.".
Note _every_ pair.
These requirements become increasingly necessary as the clock rate increases. The capacitor on the Vcore pin becomes increasingly important.
I've used the software I2C at 64MHz without problems. So the problem is either a timing fault in the SSD library or a hardware problem with your configuration... |
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RF_Developer
Joined: 07 Feb 2011
Posts: 839
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| Posted: Thu Nov 23, 2017 5:02 am |
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| johanpret wrote: | | I think it must be a bug in the software I2C library. What do u think. |
What do I think? I think you should be using the hardware I2C, especially at higher clock speeds. The hardware is designed to meet the requirements, especially voltage levels, of I2C. The software implementation cannot fully meet those requirements.
I have used the PIC18F48K80, a bigger brother of the 26K80, at 64MHz without any trouble. However, I always use the hardware peripherals where available, rarely use I2C, preferring SPI mainly due to cost and availability. I only use software implemented peripherals if I absolutely have to, and when I fully understand the compromises and restrictions of such implementations.
All that said, it might be a software issue. I have experienced timing issues on CCS code with processor clock rates above 40MHz or so, at least on version 4.1xx of PCH. EDIT: I now remember that was on Modbus, which uses timeouts/delays as an integral part of its protocol.
I have had no such issues with PCD, where processor clocks are generally higher. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
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| Posted: Thu Nov 23, 2017 5:29 am |
|
|
| johanpret wrote: | | I think it must be a bug in the software I2C library. What do u think. I submitted to CCS. |
What is your compiler version ? |
|
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