8bit interface

[nimaltd]

I use stm32f103VE in FSMC 8bit. my lcd is ili9481 in 8 bit interface. how can config my lcd ? i cant drive it .

its not work.

#define GDISP_REG              ((volatile uint16_t *) 0x60000000)[0] /* RS = 0 */
#define GDISP_RAM              ((volatile uint16_t *) 0x60FF0000)[0] /* RS = 1 */

static GFXINLINE void init_board(GDisplay *g) {
    (void) g;
  HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_2);
  
}

static GFXINLINE void post_init_board(GDisplay *g) {
    (void) g;
}

static GFXINLINE void setpin_reset(GDisplay *g, bool_t state) {
    (void) g;
    HAL_GPIO_WritePin(LCD_RST_GPIO_Port,LCD_RST_Pin,(GPIO_PinState) !state);
}

static GFXINLINE void set_backlight(GDisplay *g, uint8_t percent) {
    (void) g;
    if(percent > 99)
        percent = 99;
    htim2.Instance->CCR2 = percent;
}

static GFXINLINE void acquire_bus(GDisplay *g) {
    (void) g;
}

static GFXINLINE void release_bus(GDisplay *g) {
    (void) g;
}

static GFXINLINE void write_index(GDisplay *g, uint16_t index) {
    (void) g;
  GDISP_REG = index&0x00ff;
}

static GFXINLINE void write_data(GDisplay *g, uint16_t data) {
    (void) g;
  
  GDISP_RAM = (data>>8);
  GDISP_RAM = data&0x00ff;
}

static GFXINLINE void setreadmode(GDisplay *g) {
    (void) g;
}

static GFXINLINE void setwritemode(GDisplay *g) {
    (void) g;
}

static GFXINLINE uint16_t read_data(GDisplay *g) {
    (void) g;
  uint16_t data;

  data = (GDISP_RAM<<8);  
  data |= GDISP_RAM;

  
    return data;
}
 

Edited March 4, 2017 by nimaltd

[nimaltd]

and please tell me about FSMC initlizing on cubemx

[Joel Bodenmann]

The ILI9481 display controller has a set of pins that control which interface is used. These are called IM0 and IM1 if I remember correctly. You have to set them correctly to select the 8-bit parallel interface.

[nimaltd]

its true. I use lcd  module. its work fine with example.

i drive now. but have a problem. my color is wrong.my display size is wrong.

this is my calibration window.

i change initlize register. but no diftrent.

[nimaltd]

 FSMC_NORSRAM_TimingTypeDef Timing;

  /** Perform the SRAM1 memory initialization sequence
  */
  hsram1.Instance = FSMC_NORSRAM_DEVICE;
  hsram1.Extended = FSMC_NORSRAM_EXTENDED_DEVICE;
  /* hsram1.Init */
  hsram1.Init.NSBank = FSMC_NORSRAM_BANK1;
  hsram1.Init.DataAddressMux = FSMC_DATA_ADDRESS_MUX_DISABLE;
  hsram1.Init.MemoryType = FSMC_MEMORY_TYPE_SRAM;
  hsram1.Init.MemoryDataWidth = FSMC_NORSRAM_MEM_BUS_WIDTH_16;                               <<<< not work in 8 bit.. I dont know why. 
  hsram1.Init.BurstAccessMode = FSMC_BURST_ACCESS_MODE_DISABLE;
  hsram1.Init.WaitSignalPolarity = FSMC_WAIT_SIGNAL_POLARITY_LOW;
  hsram1.Init.WrapMode = FSMC_WRAP_MODE_DISABLE;
  hsram1.Init.WaitSignalActive = FSMC_WAIT_TIMING_BEFORE_WS;
  hsram1.Init.WriteOperation = FSMC_WRITE_OPERATION_ENABLE;
  hsram1.Init.WaitSignal = FSMC_WAIT_SIGNAL_DISABLE;
  hsram1.Init.ExtendedMode = FSMC_EXTENDED_MODE_DISABLE;
  hsram1.Init.AsynchronousWait = FSMC_ASYNCHRONOUS_WAIT_DISABLE;
  hsram1.Init.WriteBurst = FSMC_WRITE_BURST_DISABLE;
  /* Timing */
  Timing.AddressSetupTime = 2;
  Timing.AddressHoldTime = 2;
  Timing.DataSetupTime = 5;
  Timing.BusTurnAroundDuration = 0;
  Timing.CLKDivision = 2;
  Timing.DataLatency = 2;
  Timing.AccessMode = FSMC_ACCESS_MODE_B;

 

 

/////////////////////////////

 

 

    LLDSPEC    void gdisp_lld_write_color(GDisplay *g)
  {
        write_data(g, gdispColor2Native(g->p.color)>>8);
    write_data(g, gdispColor2Native(g->p.color));
    }

 

/////////////////////////////

 

static GFXINLINE void write_index(GDisplay *g, uint16_t index)
{
    (void) g;
  GDISP_REG = index;
}

static GFXINLINE void write_data(GDisplay *g, uint16_t data)
{
    (void) g;
  GDISP_RAM = data;
}
 

 

 

 

 

 

 

[inmarket]

In gdisp_lld_write_color() try reversing the two lines that write data. I suspect you are writing them in the wrong order.

[Joel Bodenmann]

9 hours ago, nimaltd said:

static GFXINLINE void write_index(GDisplay *g, uint16_t index)
{
    (void) g;
  GDISP_REG = index;
}

static GFXINLINE void write_data(GDisplay *g, uint16_t data)
{
    (void) g;
  GDISP_RAM = data;
}

You have to write (and read) two bytes here. Currently you're missing out on half of the data.

 

9 hours ago, nimaltd said:

FSMC_NORSRAM_MEM_BUS_WIDTH_16

And yes, that is definitely wrong too if you want to use the 8-bit bus.

[nimaltd]

I try all of them. but my color is wrong . 

[nimaltd]

#define GDISP_LLD_PIXELFORMAT            GDISP_PIXELFORMAT_BGR565 

its work .