LCD Driver - OLD

[mobyfab]

Hey,

I'm trying to convert this to the PAL library for a lcd controller library:

Code: Select all

SSD1963_DATAPORT->ODR  = commandToWrite;
SSD1963_CTRLPORT->BSRR = SSD1963_PIN_RD;
SSD1963_CTRLPORT->BRR  = SSD1963_PIN_A0 | SSD1963_PIN_CS | SSD1963_PIN_WR;
sleep(10);
SSD1963_CTRLPORT->BSRR = SSD1963_PIN_A0 | SSD1963_PIN_CS | SSD1963_PIN_WR;

I wrote this:

Code: Select all

   palSetPort(SSD1963_DATAPORT, commandToWrite);
   palClearPort(SSD1963_DATAPORT, SSD1963_PIN_RD);
   palSetPort(SSD1963_CTRLPORT, SSD1963_PIN_A0 | SSD1963_PIN_CS | SSD1963_PIN_WR);   
   chThdSleepMilliseconds(10);
   palClearPort(SSD1963_CTRLPORT, SSD1963_PIN_A0 | SSD1963_PIN_CS | SSD1963_PIN_WR);   


port init:

Code: Select all

   
palSetGroupMode(SSD1963_DATAPORT, 0xFFFF, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
palSetGroupMode(SSD1963_CTRLPORT, SSD1963_PIN_RD | SSD1963_PIN_WR | SSD1963_PIN_CS | SSD1963_PIN_A0 | SSD1963_PIN_RST, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
   

is this correct ? it does not seem to work.

[Giovanni]

Hi,

I think it is because you got it reversed:

SSD1963_CTRLPORT->BSRR = SSD1963_PIN_RD <- This sets the specified mask.

SSD1963_CTRLPORT->BRR = SSD1963_PIN_A0 | SSD1963_PIN_CS | SSD1963_PIN_WR <- This one clears the specified mask

Giovanni

[mobyfab]

haha you were right, beginner mistake

here it is fixed:

Code: Select all

void SSD1963_WriteCommand(uint16_t commandToWrite)
{   
   palWritePort(SSD1963_CTRLPORT, SSD1963_PIN_RD | SSD1963_PIN_RST); // All pins low but READ and RST
   palWritePort(SSD1963_DATAPORT, commandToWrite);
   static uint16_t dly;
   for(dly = 0; dly < 50; dly++)
      asm("nop");
   palWritePort(SSD1963_CTRLPORT, SSD1963_PIN_RS | SSD1963_PIN_CS | SSD1963_PIN_WR | SSD1963_PIN_RST); // All pins up but READ and RST
}


Couldn't use the chthdsleep functions since they last way too long.
Also I'm using one writeport call since it's faster than a set then a clear.

[Giovanni]

You could use the GPT driver for small delays, it has a specific function.

Giovanni

[mobyfab]

It's alive



I will look into it, thanks.

[Giovanni]

Nice, now details

Giovanni

[mobyfab]

I will post the library as soon as I'm done.

Currently implementing a way to write strings to the LCD to replace the console.
It would be fun to display the test results on it.

[mobyfab]

almost there



http://youtu.be/U0idR_mp0b8

[mobyfab]

I'm currently facing an annoying problem: The onboard 3.3v regulator doesn't provide enough power to the module so that it can print full white...
Basically at some point the lcd controller crashes. (I'm using the STlink via USB as power source)

I need to get a power supply since mine is at my parent's place

Else I've just done the function to draw bitmaps
I'm converting bitmaps to RGB565 arrays using the tool provided by ST. (the GUI designer thing)



for those wondering the refresh speed (MCU->controller) is about 53 FPS.

Edit: I think my LCD controller is busted...
I ordered a couple new SSD1963 ICs, will swap it as soon as I get them.

[mobyfab]

Just found that in the datasheet: (page 48)

PC13, PC14, PC15 and PI8 are supplied through the power switch. Since the switch only sinks a limited amount of current
(3 mA), the use of GPIOs PC13 to PC15 and PI8 in output mode is limited: the speed should not exceed 2 MHz with a
maximum load of 30 pF and these I/Os must not be used as a current source (e.g. to drive an LED).

I'm using port C to drive the data lines... at around 6Mhz

Hopefully that's the cause of my problems, I will find out pretty soon.
Anyways I have ordered 2 new ICs for other projects, so if this one's really busted I'll replace it.

Once I get it to work as intended, I'll start to use the FSMC which is much faster.

Giovanni, can you move this thread to the dev area?