rt-thread/bsp/stm32f429-disco/drivers/drv_lcd.c

/*
 * File      : drv_lcd.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2009 RT-Thread Develop Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018-09-13     xuzhuoyi     first implementation
 */

#include "drv_lcd.h"
#include <finsh.h>

//#define DEBUG

#ifdef DEBUG
#define DEBUG_PRINTF(...)   rt_kprintf(__VA_ARGS__)
#else
#define DEBUG_PRINTF(...)   
#endif

typedef struct
{
	rt_uint16_t width;			//LCD 宽度
	rt_uint16_t height;			//LCD 高度
	rt_uint16_t id;				//LCD ID
	rt_uint8_t  dir;			//横屏还是竖屏控制：0，竖屏；1，横屏。	
	rt_uint16_t	wramcmd;		//开始写gram指令
	rt_uint16_t setxcmd;		//设置x坐标指令
	rt_uint16_t setycmd;		//设置y坐标指令 
} lcd_info_t;

typedef struct
{
	volatile rt_uint16_t reg;
	volatile rt_uint16_t ram;
} lcd_ili9341_t;

//使用NOR/SRAM的 Bank1.sector1,地址位HADDR[27,26]=00 A18作为数据命令区分线 
//注意设置时STM32内部会右移一位对其!
#define LCD_ILI9341_BASE        ((rt_uint32_t)(0x60000000 | 0x0007FFFE))
#define ili9341					((lcd_ili9341_t *) LCD_ILI9341_BASE)
//////////////////////////////////////////////////////////////////////////////////

//扫描方向定义
#define L2R_U2D  0 		//从左到右,从上到下
#define L2R_D2U  1 		//从左到右,从下到上
#define R2L_U2D  2 		//从右到左,从上到下
#define R2L_D2U  3 		//从右到左,从下到上
#define U2D_L2R  4 		//从上到下,从左到右
#define U2D_R2L  5 		//从上到下,从右到左
#define D2U_L2R  6 		//从下到上,从左到右
#define D2U_R2L  7		//从下到上,从右到左	 
#define DFT_SCAN_DIR  L2R_U2D  //默认的扫描方向

static lcd_info_t lcddev;
LTDC_HandleTypeDef  LtdcHandler;
static RCC_PeriphCLKInitTypeDef  PeriphClkInitStruct;
/* Default LCD configuration with LCD Layer 1 */
static uint32_t ActiveLayer = 0;
//LCD_DrvTypeDef  *LcdDrv;
SPI_HandleTypeDef hspi5;

void delay_us(rt_uint32_t nus)
{
	//rt_thread_delay(1);
	while (nus--) {
		__NOP();
	}
}

void delay_ms(rt_uint32_t nms)
{
	//rt_thread_delay((RT_TICK_PER_SECOND * nms + 999) / 1000);
	while (nms--)
	{
		int i;
		for (i = 0; i < 10000; i++)
		{
			__NOP();
		}
	}
}


/**
  * @brief  Selects the LCD Layer.
  * @param  LayerIndex: the Layer foreground or background.
  */
void BSP_LCD_SelectLayer(uint32_t LayerIndex)
{
  ActiveLayer = LayerIndex;
}

/**
  * @brief  Initializes the LTDC MSP.
  */
__weak void BSP_LCD_MspInit(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /* Enable the LTDC and DMA2D Clock */
  __HAL_RCC_LTDC_CLK_ENABLE();
  __HAL_RCC_DMA2D_CLK_ENABLE(); 
  
  /* Enable GPIOs clock */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();

  /* GPIOs Configuration */
  /*
   +------------------------+-----------------------+----------------------------+
   +                       LCD pins assignment                                   +
   +------------------------+-----------------------+----------------------------+
   |  LCD_TFT R2 <-> PC.10  |  LCD_TFT G2 <-> PA.06 |  LCD_TFT B2 <-> PD.06      |
   |  LCD_TFT R3 <-> PB.00  |  LCD_TFT G3 <-> PG.10 |  LCD_TFT B3 <-> PG.11      |
   |  LCD_TFT R4 <-> PA.11  |  LCD_TFT G4 <-> PB.10 |  LCD_TFT B4 <-> PG.12      |
   |  LCD_TFT R5 <-> PA.12  |  LCD_TFT G5 <-> PB.11 |  LCD_TFT B5 <-> PA.03      |
   |  LCD_TFT R6 <-> PB.01  |  LCD_TFT G6 <-> PC.07 |  LCD_TFT B6 <-> PB.08      |
   |  LCD_TFT R7 <-> PG.06  |  LCD_TFT G7 <-> PD.03 |  LCD_TFT B7 <-> PB.09      |
   -------------------------------------------------------------------------------
            |  LCD_TFT HSYNC <-> PC.06  | LCDTFT VSYNC <->  PA.04 |
            |  LCD_TFT CLK   <-> PG.07  | LCD_TFT DE   <->  PF.10 |
             -----------------------------------------------------
  */

  /* GPIOA configuration */
  GPIO_InitStructure.Pin = GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_6 |
                           GPIO_PIN_11 | GPIO_PIN_12;
  GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
  GPIO_InitStructure.Alternate= GPIO_AF14_LTDC;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);

 /* GPIOB configuration */
  GPIO_InitStructure.Pin = GPIO_PIN_8 | \
                           GPIO_PIN_9 | GPIO_PIN_10 | GPIO_PIN_11;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);

 /* GPIOC configuration */
  GPIO_InitStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_10;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);

 /* GPIOD configuration */
  GPIO_InitStructure.Pin = GPIO_PIN_3 | GPIO_PIN_6;
  HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
  
 /* GPIOF configuration */
  GPIO_InitStructure.Pin = GPIO_PIN_10;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStructure);     

 /* GPIOG configuration */  
  GPIO_InitStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7 | \
                           GPIO_PIN_11;
  HAL_GPIO_Init(GPIOG, &GPIO_InitStructure);
 
  /* GPIOB configuration */  
  GPIO_InitStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1;
  GPIO_InitStructure.Alternate= GPIO_AF9_LTDC;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* GPIOG configuration */  
  GPIO_InitStructure.Pin = GPIO_PIN_10 | GPIO_PIN_12;
  HAL_GPIO_Init(GPIOG, &GPIO_InitStructure);
}

/**
  * @brief  SPIx error treatment function.
  */
static void SPIx_Error(void)
{
  /* De-initialize the SPI communication BUS */
  HAL_SPI_DeInit(&hspi5);
  
  /* Re- Initialize the SPI communication BUS */
  /* SPI5 parameter configuration*/
  hspi5.Instance = SPI5;
  hspi5.Init.Mode = SPI_MODE_MASTER;
  hspi5.Init.Direction = SPI_DIRECTION_2LINES;
  hspi5.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi5.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi5.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi5.Init.NSS = SPI_NSS_SOFT;
  hspi5.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
  hspi5.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi5.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi5.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi5.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi5) != HAL_OK)
  {
    //_Error_Handler(__FILE__, __LINE__);
  }
}

/**
  * @brief  Writes a byte to device.
  * @param  Value: value to be written
  */
static void SPIx_Write(uint16_t Value)
{
  HAL_StatusTypeDef status = HAL_OK;
  
  status = HAL_SPI_Transmit(&hspi5, (uint8_t*) &Value, 1, 0x1000);
  
  /* Check the communication status */
  if(status != HAL_OK)
  {
    /* Re-Initialize the BUS */
    SPIx_Error();
  }
}

/**
  * @brief  Reads 4 bytes from device.
  * @param  ReadSize: Number of bytes to read (max 4 bytes)
  * @retval Value read on the SPI
  */
static uint32_t SPIx_Read(uint8_t ReadSize)
{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t readvalue;
  
  status = HAL_SPI_Receive(&hspi5, (uint8_t*) &readvalue, ReadSize, 0x1000);
  
  /* Check the communication status */
  if(status != HAL_OK)
  {
    /* Re-Initialize the BUS */
    SPIx_Error();
  }
  
  return readvalue;
}

/**
  * @brief  Configures the LCD_SPI interface.
  */
__weak void LCD_IO_Init(void)
{
   /* Set or Reset the control line */
    LCD_CS_LOW();
    LCD_CS_HIGH();
    
	  /* SPI5 parameter configuration*/
  hspi5.Instance = SPI5;
  hspi5.Init.Mode = SPI_MODE_MASTER;
  hspi5.Init.Direction = SPI_DIRECTION_2LINES;
  hspi5.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi5.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi5.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi5.Init.NSS = SPI_NSS_SOFT;
  hspi5.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
  hspi5.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi5.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi5.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi5.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi5) != HAL_OK)
  {
    //_Error_Handler(__FILE__, __LINE__);
  }
	
}

/**
  * @brief  Writes  to the selected LCD register.
  * @param  LCD_Reg: address of the selected register.
  * @retval None
  */
void ili9341_WriteReg(uint8_t LCD_Reg)
{
  /* Reset WRX to send command */
  LCD_WRX_LOW();
  
  /* Reset LCD control line(/CS) and Send command */
  LCD_CS_LOW();
  SPIx_Write(LCD_Reg);
  
  /* Deselect: Chip Select high */
  LCD_CS_HIGH();
}

/**
  * @brief  Writes data to the selected LCD register.
  * @param  LCD_Reg: address of the selected register.
  * @retval None
  */
void ili9341_WriteData(uint16_t RegValue)
{
  /* Set WRX to send data */
  LCD_WRX_HIGH();
  
  /* Reset LCD control line(/CS) and Send data */  
  LCD_CS_LOW();
  SPIx_Write(RegValue);
  
  /* Deselect: Chip Select high */
  LCD_CS_HIGH();
}

/**
  * @brief  Reads the selected LCD Register.
  * @param  RegValue: Address of the register to read
  * @param  ReadSize: Number of bytes to read
  * @retval LCD Register Value.
  */
uint32_t ili9341_ReadData(uint16_t RegValue, uint8_t ReadSize)
{
  uint32_t readvalue = 0;

  /* Select: Chip Select low */
  LCD_CS_LOW();

  /* Reset WRX to send command */
  LCD_WRX_LOW();
  
  SPIx_Write(RegValue);
  
  readvalue = SPIx_Read(ReadSize);

  /* Set WRX to send data */
  LCD_WRX_HIGH();

  /* Deselect: Chip Select high */
  LCD_CS_HIGH();
  
  return readvalue;
}

/**
  * @brief  Enables the Display.
  */
void BSP_LCD_DisplayOn(void)
{
  /* Display On */
  ili9341_WriteReg(LCD_DISPLAY_ON);
}

/**
  * @brief  Disables the Display.
  */
void BSP_LCD_DisplayOff(void)
{
  /* Display Off */
  ili9341_WriteReg(LCD_DISPLAY_OFF);
}

void ili9341_Init(void)
{
  /* Initialize ILI9341 low level bus layer ----------------------------------*/
  LCD_IO_Init();
  
  /* Configure LCD */
  ili9341_WriteReg(0xCA);
  ili9341_WriteData(0xC3);
  ili9341_WriteData(0x08);
  ili9341_WriteData(0x50);
  ili9341_WriteReg(LCD_POWERB);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0xC1);
  ili9341_WriteData(0x30);
  ili9341_WriteReg(LCD_POWER_SEQ);
  ili9341_WriteData(0x64);
  ili9341_WriteData(0x03);
  ili9341_WriteData(0x12);
  ili9341_WriteData(0x81);
  ili9341_WriteReg(LCD_DTCA);
  ili9341_WriteData(0x85);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x78);
  ili9341_WriteReg(LCD_POWERA);
  ili9341_WriteData(0x39);
  ili9341_WriteData(0x2C);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x34);
  ili9341_WriteData(0x02);
  ili9341_WriteReg(LCD_PRC);
  ili9341_WriteData(0x20);
  ili9341_WriteReg(LCD_DTCB);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x00);
  ili9341_WriteReg(LCD_FRMCTR1);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x1B);
  ili9341_WriteReg(LCD_DFC);
  ili9341_WriteData(0x0A);
  ili9341_WriteData(0xA2);
  ili9341_WriteReg(LCD_POWER1);
  ili9341_WriteData(0x10);
  ili9341_WriteReg(LCD_POWER2);
  ili9341_WriteData(0x10);
  ili9341_WriteReg(LCD_VCOM1);
  ili9341_WriteData(0x45);
  ili9341_WriteData(0x15);
  ili9341_WriteReg(LCD_VCOM2);
  ili9341_WriteData(0x90);
  ili9341_WriteReg(LCD_MAC);
  ili9341_WriteData(0xC8);
  ili9341_WriteReg(LCD_3GAMMA_EN);
  ili9341_WriteData(0x00);
  ili9341_WriteReg(LCD_RGB_INTERFACE);
  ili9341_WriteData(0xC2);
  ili9341_WriteReg(LCD_DFC);
  ili9341_WriteData(0x0A);
  ili9341_WriteData(0xA7);
  ili9341_WriteData(0x27);
  ili9341_WriteData(0x04);
  
  /* Colomn address set */
  ili9341_WriteReg(LCD_COLUMN_ADDR);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0xEF);
  /* Page address set */
  ili9341_WriteReg(LCD_PAGE_ADDR);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x01);
  ili9341_WriteData(0x3F);
  ili9341_WriteReg(LCD_INTERFACE);
  ili9341_WriteData(0x01);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x06);
  
  ili9341_WriteReg(LCD_GRAM);
  delay_ms(200);
  
  ili9341_WriteReg(LCD_GAMMA);
  ili9341_WriteData(0x01);
  
  ili9341_WriteReg(LCD_PGAMMA);
  ili9341_WriteData(0x0F);
  ili9341_WriteData(0x29);
  ili9341_WriteData(0x24);
  ili9341_WriteData(0x0C);
  ili9341_WriteData(0x0E);
  ili9341_WriteData(0x09);
  ili9341_WriteData(0x4E);
  ili9341_WriteData(0x78);
  ili9341_WriteData(0x3C);
  ili9341_WriteData(0x09);
  ili9341_WriteData(0x13);
  ili9341_WriteData(0x05);
  ili9341_WriteData(0x17);
  ili9341_WriteData(0x11);
  ili9341_WriteData(0x00);
  ili9341_WriteReg(LCD_NGAMMA);
  ili9341_WriteData(0x00);
  ili9341_WriteData(0x16);
  ili9341_WriteData(0x1B);
  ili9341_WriteData(0x04);
  ili9341_WriteData(0x11);
  ili9341_WriteData(0x07);
  ili9341_WriteData(0x31);
  ili9341_WriteData(0x33);
  ili9341_WriteData(0x42);
  ili9341_WriteData(0x05);
  ili9341_WriteData(0x0C);
  ili9341_WriteData(0x0A);
  ili9341_WriteData(0x28);
  ili9341_WriteData(0x2F);
  ili9341_WriteData(0x0F);
  
  ili9341_WriteReg(LCD_SLEEP_OUT);
  delay_ms(200);
  ili9341_WriteReg(LCD_DISPLAY_ON);
  /* GRAM start writing */
  ili9341_WriteReg(LCD_GRAM);
}

/**
  * @brief  Initializes the LCD layers.
  * @param  LayerIndex: the layer foreground or background. 
  * @param  FB_Address: the layer frame buffer.
  */
void BSP_LCD_LayerDefaultInit(uint16_t LayerIndex, uint32_t FB_Address)
{     
  LTDC_LayerCfgTypeDef   Layercfg;

 /* Layer Init */
  Layercfg.WindowX0 = 0;
  Layercfg.WindowX1 = 240;
  Layercfg.WindowY0 = 0;
  Layercfg.WindowY1 = 320; 
  Layercfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;
  Layercfg.FBStartAdress = FB_Address;
  Layercfg.Alpha = 255;
  Layercfg.Alpha0 = 0;
  Layercfg.Backcolor.Blue = 0;
  Layercfg.Backcolor.Green = 0;
  Layercfg.Backcolor.Red = 0;
  Layercfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
  Layercfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;
  Layercfg.ImageWidth = 240;
  Layercfg.ImageHeight = 320;
  
  HAL_LTDC_ConfigLayer(&LtdcHandler, &Layercfg, LayerIndex); 

  //DrawProp[LayerIndex].BackColor = LCD_COLOR_WHITE;
  //DrawProp[LayerIndex].pFont     = &Font24;
  //DrawProp[LayerIndex].TextColor = LCD_COLOR_BLACK; 

  /* Dithering activation */
  HAL_LTDC_EnableDither(&LtdcHandler);
}

uint8_t BSP_LCD_Init(void)
{ 
  /* On STM32F429I-DISCO, it is not possible to read ILI9341 ID because */
  /* PIN EXTC is not connected to VDD and then LCD_READ_ID4 is not accessible. */
  /* In this case, ReadID function is bypassed.*/  
  /*if(ili9341_drv.ReadID() == ILI9341_ID)*/

    /* LTDC Configuration ----------------------------------------------------*/
    LtdcHandler.Instance = LTDC;
    
    /* Timing configuration  (Typical configuration from ILI9341 datasheet)
          HSYNC=10 (9+1)
          HBP=20 (29-10+1)
          ActiveW=240 (269-20-10+1)
          HFP=10 (279-240-20-10+1)
    
          VSYNC=2 (1+1)
          VBP=2 (3-2+1)
          ActiveH=320 (323-2-2+1)
          VFP=4 (327-320-2-2+1)
      */
    
    /* Configure horizontal synchronization width */
    LtdcHandler.Init.HorizontalSync = ILI9341_HSYNC;
    /* Configure vertical synchronization height */
    LtdcHandler.Init.VerticalSync = ILI9341_VSYNC;
    /* Configure accumulated horizontal back porch */
    LtdcHandler.Init.AccumulatedHBP = ILI9341_HBP;
    /* Configure accumulated vertical back porch */
    LtdcHandler.Init.AccumulatedVBP = ILI9341_VBP;
    /* Configure accumulated active width */
    LtdcHandler.Init.AccumulatedActiveW = 269;
    /* Configure accumulated active height */
    LtdcHandler.Init.AccumulatedActiveH = 323;
    /* Configure total width */
    LtdcHandler.Init.TotalWidth = 279;
    /* Configure total height */
    LtdcHandler.Init.TotalHeigh = 327;
    
    /* Configure R,G,B component values for LCD background color */
    LtdcHandler.Init.Backcolor.Red= 0;
    LtdcHandler.Init.Backcolor.Blue= 0;
    LtdcHandler.Init.Backcolor.Green= 0;
    
    /* LCD clock configuration */
    /* PLLSAI_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
    /* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAIN = 192 Mhz */
    /* PLLLCDCLK = PLLSAI_VCO Output/PLLSAIR = 192/4 = 48 Mhz */
    /* LTDC clock frequency = PLLLCDCLK / LTDC_PLLSAI_DIVR_8 = 48/4 = 6Mhz */
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC;
    PeriphClkInitStruct.PLLSAI.PLLSAIN = 192;
    PeriphClkInitStruct.PLLSAI.PLLSAIR = 4;
    PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_8;
    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct); 
    
    /* Polarity */
    LtdcHandler.Init.HSPolarity = LTDC_HSPOLARITY_AL;
    LtdcHandler.Init.VSPolarity = LTDC_VSPOLARITY_AL;
    LtdcHandler.Init.DEPolarity = LTDC_DEPOLARITY_AL;
    LtdcHandler.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
    
    BSP_LCD_MspInit();
    HAL_LTDC_Init(&LtdcHandler); 
    
    /* Select the device */
    //LcdDrv = &ili9341_drv;

    /* LCD Init */	 
    ili9341_Init();

    /* Initialize the SDRAM */
    //BSP_SDRAM_Init();

    /* Initialize the font */
    //BSP_LCD_SetFont(&LCD_DEFAULT_FONT);

  return 0;
}  

void BSP_LCD_DrawPixel(uint16_t Xpos, uint16_t Ypos, uint32_t RGB_Code)
{
  /* Write data value to all SDRAM memory */
  *(__IO uint32_t*) (LtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (4*(Ypos*240 + Xpos))) = RGB_Code;
}

void BSP_LCD_DrawLine(uint32_t pixel, uint16_t X1, uint16_t Y1, uint16_t X2, uint16_t Y2)
{
  int16_t deltax = 0, deltay = 0, x = 0, y = 0, xinc1 = 0, xinc2 = 0, 
  yinc1 = 0, yinc2 = 0, den = 0, num = 0, numadd = 0, numpixels = 0, 
  curpixel = 0;
  
  deltax = ABS(X2 - X1);        /* The difference between the x's */
  deltay = ABS(Y2 - Y1);        /* The difference between the y's */
  x = X1;                       /* Start x off at the first pixel */
  y = Y1;                       /* Start y off at the first pixel */
  
  if (X2 >= X1)                 /* The x-values are increasing */
  {
    xinc1 = 1;
    xinc2 = 1;
  }
  else                          /* The x-values are decreasing */
  {
    xinc1 = -1;
    xinc2 = -1;
  }
  
  if (Y2 >= Y1)                 /* The y-values are increasing */
  {
    yinc1 = 1;
    yinc2 = 1;
  }
  else                          /* The y-values are decreasing */
  {
    yinc1 = -1;
    yinc2 = -1;
  }
  
  if (deltax >= deltay)         /* There is at least one x-value for every y-value */
  {
    xinc1 = 0;                  /* Don't change the x when numerator >= denominator */
    yinc2 = 0;                  /* Don't change the y for every iteration */
    den = deltax;
    num = deltax / 2;
    numadd = deltay;
    numpixels = deltax;         /* There are more x-values than y-values */
  }
  else                          /* There is at least one y-value for every x-value */
  {
    xinc2 = 0;                  /* Don't change the x for every iteration */
    yinc1 = 0;                  /* Don't change the y when numerator >= denominator */
    den = deltay;
    num = deltay / 2;
    numadd = deltax;
    numpixels = deltay;         /* There are more y-values than x-values */
  }
  
  for (curpixel = 0; curpixel <= numpixels; curpixel++)
  {
    BSP_LCD_DrawPixel(x, y, pixel);   /* Draw the current pixel */
    num += numadd;                            /* Increase the numerator by the top of the fraction */
    if (num >= den)                           /* Check if numerator >= denominator */
    {
      num -= den;                             /* Calculate the new numerator value */
      x += xinc1;                             /* Change the x as appropriate */
      y += yinc1;                             /* Change the y as appropriate */
    }
    x += xinc2;                               /* Change the x as appropriate */
    y += yinc2;                               /* Change the y as appropriate */
  }
}

rt_uint16_t ili9341_bgr2rgb(rt_uint16_t value)
{
	rt_uint16_t  red, green, blue;

	blue = (value >> 0) & 0x1f;
	green = (value >> 5) & 0x3f;
	red = (value >> 11) & 0x1f;

	return (blue << 11) + (green << 5) + (red << 0);
}
  	   
//static void ili9341_set_scan_direction(rt_uint8_t dir)
//{
//	rt_uint16_t regval = 0;
//	rt_uint16_t dirreg = 0;
//	rt_uint16_t temp;

//	switch (dir)
//	{
//	case L2R_U2D://从左到右,从上到下
//		regval |= (0 << 7) | (0 << 6) | (0 << 5);
//		break;
//	case L2R_D2U://从左到右,从下到上
//		regval |= (1 << 7) | (0 << 6) | (0 << 5);
//		break;
//	case R2L_U2D://从右到左,从上到下
//		regval |= (0 << 7) | (1 << 6) | (0 << 5);
//		break;
//	case R2L_D2U://从右到左,从下到上
//		regval |= (1 << 7) | (1 << 6) | (0 << 5);
//		break;
//	case U2D_L2R://从上到下,从左到右
//		regval |= (0 << 7) | (0 << 6) | (1 << 5);
//		break;
//	case U2D_R2L://从上到下,从右到左
//		regval |= (0 << 7) | (1 << 6) | (1 << 5);
//		break;
//	case D2U_L2R://从下到上,从左到右
//		regval |= (1 << 7) | (0 << 6) | (1 << 5);
//		break;
//	case D2U_R2L://从下到上,从右到左
//		regval |= (1 << 7) | (1 << 6) | (1 << 5);
//		break;
//	}

//	dirreg = 0X36;
//	ili9341_write_reg_with_value(dirreg, regval);

//	if (regval & 0X20)
//	{
//		if (lcddev.width < lcddev.height)//交换X,Y
//		{
//			temp = lcddev.width;
//			lcddev.width = lcddev.height;
//			lcddev.height = temp;
//		}
//	}
//	else
//	{
//		if (lcddev.width > lcddev.height)//交换X,Y
//		{
//			temp = lcddev.width;
//			lcddev.width = lcddev.height;
//			lcddev.height = temp;
//		}
//	}
//	
//	ili9341_write_reg(lcddev.setxcmd);
//	ili9341_write_data(0);
//	ili9341_write_data(0);
//	ili9341_write_data((lcddev.width - 1) >> 8);
//	ili9341_write_data((lcddev.width - 1) & 0XFF);

//	ili9341_write_reg(lcddev.setycmd);
//	ili9341_write_data(0);
//	ili9341_write_data(0);
//	ili9341_write_data((lcddev.height - 1) >> 8);
//	ili9341_write_data((lcddev.height - 1) & 0XFF);
//}

//void ili9341_set_backlight(rt_uint8_t pwm)
//{
//	ili9341_write_reg(0xBE);
//	ili9341_write_data(0x05);
//	ili9341_write_data(pwm*2.55);
//	ili9341_write_data(0x01);
//	ili9341_write_data(0xFF);
//	ili9341_write_data(0x00);
//	ili9341_write_data(0x00);
//}

//void ili9341_set_display_direction(rt_uint8_t dir)
//{
//	lcddev.dir = dir;
//	if (dir == 0)
//	{
//		lcddev.width = 240;
//		lcddev.height = 320;
//	}
//	else
//	{
//		lcddev.width = 320;
//		lcddev.height = 240;
//	}

//	lcddev.wramcmd = 0X2C;
//	lcddev.setxcmd = 0X2A;
//	lcddev.setycmd = 0X2B;

//	ili9341_set_scan_direction(DFT_SCAN_DIR);
//}


void _lcd_low_level_init(void)
{
	GPIO_InitTypeDef GPIO_InitStruct;

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, CSX_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOD, RDX_Pin|WRX_DCX_Pin, GPIO_PIN_RESET);


  /*Configure GPIO pins : NCS_MEMS_SPI_Pin CSX_Pin OTG_FS_PSO_Pin */
  GPIO_InitStruct.Pin = CSX_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pins : RDX_Pin WRX_DCX_Pin */
  GPIO_InitStruct.Pin = RDX_Pin|WRX_DCX_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);


	BSP_LCD_Init();
	BSP_LCD_LayerDefaultInit(0,0xD0000000);
  BSP_LCD_SelectLayer(0);
	BSP_LCD_DisplayOn();
	lcddev.width = 240;
  lcddev.height = 320;
	//ili9341_set_display_direction(0);
	//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET);
}


static rt_err_t lcd_init(rt_device_t dev)
{
	return RT_EOK;
}

static rt_err_t lcd_open(rt_device_t dev, rt_uint16_t oflag)
{
	return RT_EOK;
}

static rt_err_t lcd_close(rt_device_t dev)
{
	return RT_EOK;
}

static rt_err_t lcd_control(rt_device_t dev, int cmd, void *args)
{
	switch (cmd)
	{
	case RTGRAPHIC_CTRL_GET_INFO:
	{
		struct rt_device_graphic_info *info;

		info = (struct rt_device_graphic_info*) args;
		RT_ASSERT(info != RT_NULL);

		info->bits_per_pixel = 16;
		info->pixel_format = RTGRAPHIC_PIXEL_FORMAT_RGB565;
		info->framebuffer = RT_NULL;
		info->width = 240;
		info->height = 320;
	}
	break;

	case RTGRAPHIC_CTRL_RECT_UPDATE:
		/* nothong to be done */
		break;

	default:
		break;
	}

	return RT_EOK;
}

static void ili9341_lcd_set_pixel(const char* pixel, int x, int y)
{
	*(__IO uint32_t*) (LtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (4*(y * 240 + x))) = *(uint16_t *)pixel;
}
#ifdef RT_USING_FINSH
static void lcd_set_pixel(uint16_t color, int x, int y)
{
	rt_kprintf("lcd set pixel, color: %X, x: %d, y: %d", color, x, y);
	ili9341_lcd_set_pixel((const char *)&color, x, y);
}
FINSH_FUNCTION_EXPORT(lcd_set_pixel, set pixel in lcd display);
#endif

static void ili9341_lcd_get_pixel(char* pixel, int x, int y)
{
	uint32_t ret = 0;
  
  if(LtdcHandler.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_ARGB8888)
  {
    /* Read data value from SDRAM memory */
    ret = *(__IO uint32_t*) (LtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (4*(y * 240 + x)));
  }
  else if(LtdcHandler.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_RGB888)
  {
    /* Read data value from SDRAM memory */
    ret = (*(__IO uint32_t*) (LtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (4*(y*240 + x))) & 0x00FFFFFF);
  }
  else if((LtdcHandler.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_RGB565) || \
          (LtdcHandler.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_ARGB4444) || \
          (LtdcHandler.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_AL88))  
  {
    /* Read data value from SDRAM memory */
    ret = *(__IO uint16_t*) (LtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (2*(y*240 + x)));    
  }
  else
  {
    /* Read data value from SDRAM memory */
    ret = *(__IO uint8_t*) (LtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (2*(y*240 + x)));    
  }

  *pixel = ret;
}
#ifdef RT_USING_FINSH
static void lcd_get_pixel(int x, int y)
{
	uint16_t pixel;
	ili9341_lcd_get_pixel((char *)&pixel, x, y);
	rt_kprintf("lcd get pixel, pixel: 0x%X, x: %d, y: %d", pixel, x, y);
}
FINSH_FUNCTION_EXPORT(lcd_get_pixel, get pixel in lcd display);
#endif

static void ili9341_lcd_draw_hline(const char* pixel, int x1, int x2, int y)
{
	BSP_LCD_DrawLine(*pixel, x1, y, x2, y);
}
#ifdef RT_USING_FINSH
static void lcd_draw_hline(uint16_t pixel, int x1, int x2, int y)
{
	ili9341_lcd_draw_hline((const char *)&pixel, x1, x2, y);
	rt_kprintf("lcd draw hline, pixel: 0x%X, x1: %d, x2: %d, y: %d", pixel, x1, x2, y);
}
FINSH_FUNCTION_EXPORT(lcd_draw_hline, draw hline in lcd display);
#endif

static void ili9341_lcd_draw_vline(const char* pixel, int x, int y1, int y2)
{
	BSP_LCD_DrawLine(*pixel, x, y1, x, y2);
}
#ifdef RT_USING_FINSH
static void lcd_draw_vline(uint16_t pixel, int x, int y1, int y2)
{
	ili9341_lcd_draw_vline((const char *)&pixel, x, y1, y2);
	rt_kprintf("lcd draw hline, pixel: 0x%X, x: %d, y: %d", pixel, y1, y2);
}
FINSH_FUNCTION_EXPORT(lcd_draw_vline, draw vline in lcd display);
#endif

static void ili9341_lcd_blit_line(const char* pixels, int x, int y, rt_size_t size)
{
	int i = 0;
	while(size--)
	  *(__IO uint32_t*) (LtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (4*(y*240 + x + i++))) = *(uint16_t *)pixels++;
}
#ifdef RT_USING_FINSH
#define LINE_LEN 30
static void lcd_blit_line(int x, int y)
{
	uint16_t pixels[LINE_LEN];
	int i;

	for (i = 0; i < LINE_LEN; i++)
	{
		pixels[i] = i * 40 + 50;
	}

	ili9341_lcd_blit_line((const char *)pixels, x, y, LINE_LEN);
	rt_kprintf("lcd blit line, x: %d, y: %d", x, y);
}
FINSH_FUNCTION_EXPORT(lcd_blit_line, draw blit line in lcd display);
#endif

static int rt_hw_lcd_init(void)
{
	_lcd_low_level_init();

	static struct rt_device lcd_device;

	static struct rt_device_graphic_ops ili9341_ops =
	{
		ili9341_lcd_set_pixel,
		ili9341_lcd_get_pixel,
		ili9341_lcd_draw_hline,
		ili9341_lcd_draw_vline,
		ili9341_lcd_blit_line
	};

	/* register lcd device */
	lcd_device.type = RT_Device_Class_Graphic;
	lcd_device.init = lcd_init;
	lcd_device.open = lcd_open;
	lcd_device.close = lcd_close;
	lcd_device.control = lcd_control;
	lcd_device.read = RT_NULL;
	lcd_device.write = RT_NULL;

	lcd_device.user_data = &ili9341_ops;

	/* register graphic device driver */
	rt_device_register(&lcd_device, "lcd",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STANDALONE);

	return 0;
}
INIT_BOARD_EXPORT(rt_hw_lcd_init);