EA DOGM-162 Display
FriedV
Posts: 77
Hi,
has someone here experience with this Display?
I try in vain to init it correctly, following strictly the manual and the example C program shown by EA on their site, but it simply will not work. It is connected to a C3 propeller board using a 74HCT541 bus buffer,
the hardware works correctly all the 4 signals (MOSI, MCLK, CBS and RS show all right on LA and PicoScope.
Here is the init routine, in fact very simple:
Thx, Friedrich
has someone here experience with this Display?
I try in vain to init it correctly, following strictly the manual and the example C program shown by EA on their site, but it simply will not work. It is connected to a C3 propeller board using a 74HCT541 bus buffer,
the hardware works correctly all the 4 signals (MOSI, MCLK, CBS and RS show all right on LA and PicoScope.
Here is the init routine, in fact very simple:
' ----------------------------------------------------------------------
' File...... C3_SPI.pbas
' Author.... fgvissel 30.09.2011
' for C3 Board with 6,26 MHz X-tal
' ======================================================================
' ----- Device Settings ------------------------------------------------
DEVICE P8X32A, XTAL1, PLL16X
XIN 6_250_000
' ----- Conditional Compilation Symbols --------------------------------
' ----- Constants ------------------------------------------------------
' ----- IO Pins --------------------------------------------------------
PSI_CLR Pin 25 High
PSI_CLK Pin 8 High
RS Pin 10 Output
MOSI Pin 9 Low
MCLK Pin 11 High 'Shiftout toogles the clock from High to Low to High
'so MCLK is active Low
' ----- Shared (HUB) Variables (Byte, Word, Long) ----------------------
' ----- User Data (DATA, WDATA, LDATA, FILE) ---------------------------
' ----- TASK Definitions -----------------------------------------------
' ----- Local Variables (LONG only) ------------------------------------
channel var long
' ----- SUB and FUNC Definitions ---------------------------------------
DelayMS SUB 1
DelayUS SUB 1
SPI_Out SUB 1
' ======================================================================
PROGRAM Start
Start:
low PSI_CLR 'reset CS Counter in C3
high PSI_CLR
channel = 0 'select S6 device
do
low PSI_CLK
high PSI_CLK
inc channel
loop until channel = 6
low RS
High rs
low rs
'Init DOGM-162 LCD for 5V, 8bit SPI operation
DelayMS 40
SPI_Out $38 'function set 8 bit
SPI_Out $39 'function set 8 bit, Inst. Table 1
SPI_Out $1C 'bias set (1/4 bias)
SPI_Out $52 '3V Booster off, Contrast internal follower mode
SPI_Out $69 'follower control
DelayMS 200 'wait to stabilize
SPI_Out $74 'contrast set
SPI_Out $38 'back to Inst. Table 1
SPI_Out $0F 'Display on
SPI_Out $01 'Clear Display
DelayMS 2
SPI_Out $06 'cursor auto inc
high RS 'end of command sequence
SPI_Out $41 ' write "A" to display
DelayMS 10
' and loop forever
Main:
' program code
GOTO Main
END
' ----- SUB and FUNC Code ----------------------------------------------
SUB DelayMS
pause __param1
ENDSUB
SUB DelayUS
pauseus __param1
ENDSUB
SUB SPI_Out
shiftout MOSI, MCLK, MSBFIRST, __param1
DelayUS 50
ENDSUB
' ----- TASK Code ------------------------------------------------------
' ----------------------------------------------------------------------
Has someone running this beast?Thx, Friedrich
Comments
So I prefer the Sparkfun solution with the AVR controller & serial interface to the propeller & parallel to the LCD.
Maybe I develop an parallel 8-bit Prop or AVR subsystem fpr the dogm's.
Cheers, Fried
The display can be hardware reset (on startup) by tying the reset line to Vdd.
Cheers
Maybe this may help you.
http://forums.parallax.com/showthread.php?109792-Another-driver-for-the-EA-DOGM-126-6-(controller-ST7656R)&highlight=Greim
Regards
Markus
I tied the ^CSB pin permanently low. This disturbes the LCD, because at the Start of the propeller the
pins float wildly. So the LCD cannot sync itself, only by chance. It is for a good reason that the data sheet of the DogM does not show this pin tied to ground. So you must really drive all 4 interface pins
SI, CLK, RS and ^CSB.
Here is the working code for initializing the LCD in SPI mode:
' ------------------------------------------------------------------- ' File...... DogM162.pbas ' Author.... fgvissel 09.10.2011 ' for Propeller with 6,26 MHz X-tal ' =================================================================== ' ----- Device Settings --------------------------------------------- DEVICE P8X32A, XTAL1, PLL16X XIN 6_250_000 ' ----- IO Pins ----------------------------------------------------- RS Pin 10 High '<--> EA DogM162 Pin 39 CSB Pin 8 High '<--> EA DogM162 Pin 38 MOSI Pin 9 Low '<--> EA DogM162 Pin 28 MCLK Pin 11 High '<--> EA DogM162 Pin 29 'Shiftout toogles the clock High > Low > High 'so MCLK is idle High and active Low 'Data is transferred on the rising edge of MCLK '<==> EA DogM162 other Pins: '24,25,26,30,31,32,33,34,35,36,37,40 <-> +5V '23,27 <-> GND '21,22 Not connected ' ----- SUB and FUNC Definitions ------------------------------------ DelayMS SUB 1 DelayUS SUB 1 SPI_Out SUB 1 ' =================================================================== PROGRAM Start Start: DelayMS 200 'Init DOGM-162 LCD for 5V, 8bit SPI operation low CSB 'Chip select, Sync with Propeller low RS 'Command mode for LCD DelayMS 10 SPI_Out $38 SPI_Out $39 SPI_Out $1C SPI_Out $74 SPI_Out $52 SPI_Out $69 DelayUS 250 SPI_Out $0F SPI_Out $01 'Clear Display DelayMS 20 'End of Init high RS 'Data mode for LCD, Output: "ABC" SPI_Out $41 SPI_Out $42 SPI_Out $43 '------------------------------------------------------------------ Main: ' nothing goto Main END ' ----- SUB and FUNC Code ------------------------------------------- SUB DelayMS pause __param1 ENDSUB SUB DelayUS pauseus __param1 ENDSUB SUB SPI_Out shiftout MOSI, MCLK, MSBFIRST, __param1 DelayUS 50 ENDSUB ' ===================================================================The resulting Pin changes is shown on the 2 attached LogicPort Analyzer screenshots.Hope this helps someone!
Cheers, Fried
Friedrich