SSD1963 Initialization

[Ethan_Daugherty]

I am trying to get a 7" LCD to interface with a STM32F407VET6 microcontroller. I am using a display from winstar which the product number is WF70A2TIFGDBT0. The screen is 800x480 pixels and uses 8080 interface. The display uses a SSD1963 driver and I am trying to use FSMC to interact with it. My problem is that the screen is not being initialized properly and I am confused why. I have attached my code so if anyone is willing to look at it and help me out that would be a great help. I am thinking that it is a timing issue but I am not sure the screen is just black throughout all of my testing. I am using FSMC Address 18 for my data/command select and an 8 bit data bus. 

[mƎALLEm]

Hello,

Seems one of the community members succeeded to drive an LCD (SSD1963):

See this old thread.

[PMato.1]

I have also been successful to drive the SSD1963 using FSMC

[Enlightin]

---

@PMato.1 wrote:

I have also been successful to drive the SSD1963 using FSMC

---

Hi

I am still struggling with SSD1963 and FSMC (works fine with direct GPIO control). could you share your updated and now working project ?

Thanks

 

[PMato.1]

Hello, @Ethan_Daugherty  did you finally sort out the issue, I am facing the same challenge, my display is showing blank display even after watching a YouTube video and following what the guy was doing exactly, i still dont know where I'm going wrong, kindly help me
let me attach my full project here for reference in case you find time

[Ethan_Daugherty]

Hello @PMato.1 , I was able to figure out the problem I was dealing with. My problem was that I was addressing the wrong bits when for the data lines because it functioned differently than the resources I was looking at. I was using an 8-bit data bus with the FSMC to control my screen which is slightly different than a 16-bit data line. I realized that this driver does not really have a standard so I had to adjust some different sources for my initialization code. The main issue was that with an 8-bit data line the bits are shifted over from the 16-bit data line so my code was not initializing the screen properly because it was not receiving the correct data from write data command. Here is a resource that I used to help me https://github.com/hampussandberg/HexConnect/wiki/LCD-ER_TFTM070_5 

In the screen shot I attached is the section that helped me figure out my issue. On this it was different for the what to use for commands and data. I am not really sure why it is different but I think the resource might have been wrong or it is just different for an 8-bit bus than for a 16-bit bus. Here is what my write command and data functions looked like: 

 

 

void Write_Command(uint8_t command)
{
 //IC_RD = 1;
 //IC_A18 = 0;
 //IC_WR = 0;
 //IC_CS = 0;
 
 //Send Command to the Data Bus
 *(__IO uint8_t *)(0x60000000) = command;
 
 //IC_CS = 1;
 //IC_WR = 1;
}

//=================================
void Write_Data(uint8_t data1) //8bit data
{
 //IC_RD = 1;
 //IC_A18 = 1;
 //IC_WR = 0;
 //IC_CS = 0;
 
 //Send data to the Data Bus
 *(__IO uint8_t *)(0x60040000) = data1;//test
 //IC_CS = 1;
 //IC_WR = 1;
}

 

 

As you can see sending data is different from the resource that I was using. I just had to shift my stuff over a bit and then it worked. A lot of this is dependant on my project, considering I was using A18 for my select bit and I had an 8-bit data bus and how I wired things up. I am not sure if this helps because I do not know if you are using an 8-bit or 16-bit line or what your exact issue is. This is just how my issue was solved so I hope it can be some help for you to figure out your issue. Reading the datasheets of the STM32 and the LCD driver, helped me understand a lot of what was going on and figure out what issues could be arising.

[PMato.1]

Hey @Ethan_Daugherty  thank you so much for this detailed explanation, i have managed to figure it out using the 16 bit.

Thank you so much

[mƎALLEm]

Unmarked the "wrongly marked" solution.