Parallel Mode ST7920 + ATmega32

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1. Software SPI is working well, but to slow (0,75FPS) for my application
2. I'm not able to init parallel mode

What is the expected output? What do you see instead?
-I expect the same Output as the working init with SW SPI
-Now i se only a blank screen

What version of the product are you using? On what operating system?
1.14 @ AVR Studio 6.2

Please provide any additional information below.

-ATmega32 @ 16MHz
-Only output to Display implementet in main.

This is my init:

#define di PB0 //PIN4 data selection (R/S)
#define rw PB1 //PIN5 read or write selection (R/W)
#define en PB2 //PIN6 enable (E)
#define d0 PA0 //PIN7
#define d1 PA1 //PIN8
#define d2 PA2 //PIN9
#define d3 PA3 //PIN10
#define d4 PA4 //PIN11
#define d5 PA5 //PIN12
#define d6 PA6 //PIN13
#define d7 PA7 //PIN14
               //PIN15 PSB set HIGH (parallel)
u8g_Init8Bit(&u8g, &u8g_dev_st7920_128x64_8bit, d0, d1, d2, d3, d4, d5, d6, d7, 
en, U8G_PIN_NONE, U8G_PIN_NONE, di, rw, U8G_PIN_NONE);

Thanks in advance.

Thank you for this great lib.

Best regards,
garphi

Original issue reported on code.google.com by g4r...@gmail.com on 6 Nov 2014 at 10:46

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How are PB0, PB1, etc defined? U8glib uses a different notation.

Original comment by olikr...@gmail.com on 7 Nov 2014 at 5:43

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Thx for your fast reply.

The DDRA is set as output (0xFF) 
and DDRB PINB0-2 is set as output (0x07)

PA/B is defined in iom32.h as follows:
/* PORTA */
#define PA7     7
#define PA6     6
#define PA5     5
#define PA4     4
#define PA3     3
#define PA2     2
#define PA1     1
#define PA0     0

/* PORTB */
#define PB7     7
#define PB6     6
#define PB5     5
#define PB4     4
#define PB3     3
#define PB2     2
#define PB1     1
#define PB0     0

I got a second question (i can create a new issue if u want):
I want to speed up the main cycle, although i rewrote the LCD Output like this.
But this does not seem to be quite perfect. The first 5 or 6 lines won't be 
updatet (they're left blank)

void UpdateLCD(void)
{
  static uint8_t firstDraw = 0;

  if (!firstDraw)
  {
    u8g_FirstPage(&u8g);
  }
  if (u8g_NextPage(&u8g) || (!firstDraw))
  {
    DrawLCDobj(); 
    firstDraw = 1;
  }   
  else
  {
    TimerArray(0, set, 100);                    //Display Update-Zeit in Timer-Array 0
    firstDraw = 0;
  } 
}//end UpdateLCD

Best regards,
garphi

Original comment by g4r...@gmail.com on 7 Nov 2014 at 2:30

[GoogleCodeExporter]

As arguments for u8glib, you must use the PN() macro. See the examples: 
PN(portnumber, pinnumber)
Where portnunmber 0=Port A, 1=Port B and pinnumber is a value between 0 and 7

In your update procedure, you must call DrawLCDobj() before u8g_NextPage()

Maybe like this (not tested):
void UpdateLCD(void)
{
  static uint8_t firstDraw = 1;
  if (firstDraw <> 0)
  {
    u8g_FirstPage(&u8g);
  }
  DrawLCDobj(); 
  if (u8g_NextPage(&u8g) == 0)
  {
    firstDraw = 1;
  }   
  else
  {
    firstDraw = 0;
  } 
}//end UpdateLCD

Original comment by olikr...@gmail.com on 7 Nov 2014 at 7:23

[GoogleCodeExporter]

Thank you very much.
This has solved both of my issues.

I found my mistake. The AVR makros are used to define Ports like this:
PORTA |= (1<<PA5) to set PORTA5 high, where "PA5" shifts to the right position.

With your explanation how to use PN procedure the parallel mode works fine.
Here is my working code:

  #define di PN(1, 0) //PIN4 data selection (R/S)
  #define rw PN(1, 1) //PIN5 read or write selection (R/W)
  #define en PN(1, 2) //PIN6 enable (E)
  #define d0 PN(0, 0) //PIN7
  #define d1 PN(0, 1) //PIN8
  #define d2 PN(0, 2) //PIN9
  #define d3 PN(0, 3) //PIN10
  #define d4 PN(0, 4) //PIN11
  #define d5 PN(0, 5) //PIN12
  #define d6 PN(0, 6) //PIN13
  #define d7 PN(0, 7) //PIN14
                      //PIN15 PSB set HIGH (parallel)
  u8g_Init8Bit(&u8g, &u8g_dev_st7920_128x64_8bit, d0, d1, d2, d3, d4, d5, d6, d7, en, U8G_PIN_NONE, U8G_PIN_NONE, di, rw, U8G_PIN_NONE);

your version of UpdateLCD(void) works!
Thanks for the information that you must call DrawLCDobj() before u8g_NextPage()

Best regards ,
garphi

Original comment by g4r...@gmail.com on 8 Nov 2014 at 7:56

[GoogleCodeExporter]

ok, good, i will close this issue if you have no further questions.

Original comment by olikr...@gmail.com on 8 Nov 2014 at 8:09

[GoogleCodeExporter]

You can close this.

Original comment by g4r...@gmail.com on 8 Nov 2014 at 8:11

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Original comment by olikr...@gmail.com on 13 Dec 2014 at 6:00

• Changed state: Done
• Added labels: Type-Other
• Removed labels: Type-Defect