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Troubles in displaying images on FT801with STM32F4 board

Anna Maria Nestorov
Associate II
Posted on November 25, 2017 at 20:58

Hi all, 

I'm working on a STM32F446E connected to a FTDI FT801 LCD. I am stacked on the commands communication on the SPI between the Micro and the LCD Controller. I have to load a couple of images on the LCD but I didn't found a proper guide on the net. There are a lot of guides for what concern the LCD controller, the ones that I have read don't explain anything about the right sequence of instructions to invoke on the micro. 

Up to now I tried this:

Address_RAM_CMD = 0x908000;

SPI_Send_RAM_CMD(Address_RAM_CMD, DLSTART, 7);

     

SPI_Send_RAM_CMD(Address_RAM_CMD,CLEAR, 7);

            

SPI_Send_RAM_CMD(Address_RAM_CMD, INFLATE, 7);

            

SPI_Send_RAM_CMD(Address_RAM_CMD, 0, 7);

                              

// Destination starting address in Graphics RAM

while (filesize > 0) {

   f_read(&MyFile_R, data, sizeof(data), (UINT*) &bytesread);

   

SPI_Send_RAM_CMD(Address_RAM_CMD, data, 7);

   filesize -= 4;

}

SPI_Send_RAM_CMD(Address_RAM_CMD, BITMAP_HANDLE(0),7);

SPI_Send_RAM_CMD(Address_RAM_CMD, BITMAP_SOURCE(0),7);

SPI_Send_RAM_CMD(Address_RAM_CMD, BITMAP_LAYOUT(0x00, 946, 92) ,7);

SPI_Send_RAM_CMD(Address_RAM_CMD, BITMAP_SIZE(NEAREST,BORDER,BORDER, image_width, image_height),7);

SPI_Send_RAM_CMD(Address_RAM_CMD, BEGIN(BITMAPS), 7);  

SPI_Send_RAM_CMD(Address_RAM_CMD, VERTEX2II(4, 76, 27, 0), 7);

SPI_Send_RAM_CMD(Address_RAM_CMD, END, 7);               

SPI_Send_RAM_CMD(Address_RAM_CMD, DISPLAY, 7);

              

SPI_Send_RAM_CMD(Address_RAM_CMD, SWAP,  7);               

HAL_Delay(1000);

Where:

// This function is used to transmit data with SPI

// Address = address in the FTDI801 memory map

// Data = data to write in the FTDI801 memory map

// Size = number of bytes to write (Address + Data)

void

SPI_Send_RAM_CMD(

uint32_t

Address,

uint32_t

Data,

uint16_t

Size)

{

   

uint8_t

buffer[7];

   

buffer[0] = ((Address >> 16) & 0xFF);

   

buffer[1] = ((Address >> 😎 & 0xFF);

   

buffer[2] = (Address & 0xFF);

   

buffer[3] = (Data & 0xFF);

   

buffer[4] = ((Data >> 😎 & 0xFF);

   

buffer[5] = ((Data >> 16) & 0xFF);      

   

buffer[6] = ((Data >> 24) & 0xFF);

   

HAL_GPIO_WritePin

(GPIOG, GPIO_PIN_14,

GPIO_PIN_RESET

);

   

HAL_SPI_Transmit

(&spi_handle_structure, buffer, Size, 10000);

   

HAL_GPIO_WritePin

(GPIOG, GPIO_PIN_14,

GPIO_PIN_SET

);

   

Address_RAM_CMD = Address_RAM_CMD + 0x0000004;

   

SPI_Send(0x9024E8,(

uint16_t

)(Address_RAM_CMD-0x00908000),7);

   

// REG_CMD_WRITE

}

void

SPI_Send(

uint32_t

Address,

uint32_t

Data,

uint16_t

Size)

{

   

uint8_t

buffer[7];

   

buffer[0] = ((Address >> 16) & 0xFF);

   

buffer[1] = ((Address >> 😎 & 0xFF);

   

buffer[2] = (Address & 0xFF);   

   

buffer[3] = (Data & 0xFF);

   

buffer[4] = ((Data >> 😎 & 0xFF);

   

buffer[5] = ((Data >> 16) & 0xFF);   

   

buffer[6] = ((Data >> 24) & 0xFF);

   

HAL_GPIO_WritePin

(GPIOG, GPIO_PIN_14,

GPIO_PIN_RESET

);

   

HAL_SPI_Transmit

(&spi_handle_structure, buffer, Size, 10000);

   

HAL_GPIO_WritePin

(GPIOG, GPIO_PIN_14,

GPIO_PIN_SET

);

}

With this implementation, no image is shown on the LCD.

It seems to me that the image data are not sent to the GPU RAM.

Thanks in advance.

Cheers, 

Anna

2 REPLIES 2
Anna Maria Nestorov
Associate II
Posted on December 11, 2017 at 22:14

The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6pp&d=%2Fa%2F0X0000000bwS%2F3suas_fNg7.ELWODfzBW5jgTHZYPlkacqFaCcKFL2t8&asPdf=false
Posted on December 12, 2017 at 04:25

Are you comfortable porting arduino code to stm32?  If yes, download the sample application source from

http://www.ftdichip.com/Products/ICs/FT801.html

and see how they get an 8bitter to do it.