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/**
******************************************************************************
* @file st7735.c
* @author MCD Application Team
* @brief This file includes the driver for ST7735 LCD mounted on the Adafruit
* 1.8" TFT LCD shield (reference ID 802).
******************************************************************************
* @attention
*
* Copyright (c) 2014 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "st7735.h"
/** @addtogroup BSP
* @{
*/
/** @addtogroup Components
* @{
*/
/** @addtogroup ST7735
* @brief This file provides a set of functions needed to drive the
* ST7735 LCD.
* @{
*/
/** @defgroup ST7735_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @defgroup ST7735_Private_Defines
* @{
*/
/**
* @}
*/
/** @defgroup ST7735_Private_Macros
* @{
*/
/**
* @}
*/
/** @defgroup ST7735_Private_Variables
* @{
*/
LCD_DrvTypeDef st7735_drv =
{
st7735_Init,
0,
st7735_DisplayOn,
st7735_DisplayOff,
st7735_SetCursor,
st7735_WritePixel,
0,
st7735_SetDisplayWindow,
st7735_DrawHLine,
st7735_DrawVLine,
st7735_GetLcdPixelWidth,
st7735_GetLcdPixelHeight,
st7735_DrawBitmap,
};
static uint16_t ArrayRGB[320] = {0};
/**
* @}
*/
/** @defgroup ST7735_Private_FunctionPrototypes
* @{
*/
/**
* @}
*/
/** @defgroup ST7735_Private_Functions
* @{
*/
/**
* @brief Initialize the ST7735 LCD Component.
* @param None
* @retval None
*/
void st7735_Init(void)
{
uint8_t data = 0;
/* Initialize ST7735 low level bus layer -----------------------------------*/
LCD_IO_Init();
/* Out of sleep mode, 0 args, no delay */
st7735_WriteReg(LCD_REG_17, 0x00);
/* Frame rate ctrl - normal mode, 3 args:Rate = fosc/(1x2+40) * (LINE+2C+2D)*/
LCD_IO_WriteReg(LCD_REG_177);
data = 0x01;
LCD_IO_WriteMultipleData(&data, 1);
data = 0x2C;
LCD_IO_WriteMultipleData(&data, 1);
data = 0x2D;
LCD_IO_WriteMultipleData(&data, 1);
/* Frame rate control - idle mode, 3 args:Rate = fosc/(1x2+40) * (LINE+2C+2D) */
st7735_WriteReg(LCD_REG_178, 0x01);
st7735_WriteReg(LCD_REG_178, 0x2C);
st7735_WriteReg(LCD_REG_178, 0x2D);
/* Frame rate ctrl - partial mode, 6 args: Dot inversion mode, Line inversion mode */
st7735_WriteReg(LCD_REG_179, 0x01);
st7735_WriteReg(LCD_REG_179, 0x2C);
st7735_WriteReg(LCD_REG_179, 0x2D);
st7735_WriteReg(LCD_REG_179, 0x01);
st7735_WriteReg(LCD_REG_179, 0x2C);
st7735_WriteReg(LCD_REG_179, 0x2D);
/* Display inversion ctrl, 1 arg, no delay: No inversion */
st7735_WriteReg(LCD_REG_180, 0x07);
/* Power control, 3 args, no delay: -4.6V , AUTO mode */
st7735_WriteReg(LCD_REG_192, 0xA2);
st7735_WriteReg(LCD_REG_192, 0x02);
st7735_WriteReg(LCD_REG_192, 0x84);
/* Power control, 1 arg, no delay: VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD */
st7735_WriteReg(LCD_REG_193, 0xC5);
/* Power control, 2 args, no delay: Opamp current small, Boost frequency */
st7735_WriteReg(LCD_REG_194, 0x0A);
st7735_WriteReg(LCD_REG_194, 0x00);
/* Power control, 2 args, no delay: BCLK/2, Opamp current small & Medium low */
st7735_WriteReg(LCD_REG_195, 0x8A);
st7735_WriteReg(LCD_REG_195, 0x2A);
/* Power control, 2 args, no delay */
st7735_WriteReg(LCD_REG_196, 0x8A);
st7735_WriteReg(LCD_REG_196, 0xEE);
/* Power control, 1 arg, no delay */
st7735_WriteReg(LCD_REG_197, 0x0E);
/* Don't invert display, no args, no delay */
LCD_IO_WriteReg(LCD_REG_32);
/* Set color mode, 1 arg, no delay: 16-bit color */
st7735_WriteReg(LCD_REG_58, 0x05);
/* Column addr set, 4 args, no delay: XSTART = 0, XEND = 127 */
LCD_IO_WriteReg(LCD_REG_42);
data = 0x00;
LCD_IO_WriteMultipleData(&data, 1);
LCD_IO_WriteMultipleData(&data, 1);
LCD_IO_WriteMultipleData(&data, 1);
data = 0x7F;
LCD_IO_WriteMultipleData(&data, 1);
/* Row addr set, 4 args, no delay: YSTART = 0, YEND = 159 */
LCD_IO_WriteReg(LCD_REG_43);
data = 0x00;
LCD_IO_WriteMultipleData(&data, 1);
LCD_IO_WriteMultipleData(&data, 1);
LCD_IO_WriteMultipleData(&data, 1);
data = 0x9F;
LCD_IO_WriteMultipleData(&data, 1);
/* Magical unicorn dust, 16 args, no delay */
st7735_WriteReg(LCD_REG_224, 0x02);
st7735_WriteReg(LCD_REG_224, 0x1c);
st7735_WriteReg(LCD_REG_224, 0x07);
st7735_WriteReg(LCD_REG_224, 0x12);
st7735_WriteReg(LCD_REG_224, 0x37);
st7735_WriteReg(LCD_REG_224, 0x32);
st7735_WriteReg(LCD_REG_224, 0x29);
st7735_WriteReg(LCD_REG_224, 0x2d);
st7735_WriteReg(LCD_REG_224, 0x29);
st7735_WriteReg(LCD_REG_224, 0x25);
st7735_WriteReg(LCD_REG_224, 0x2B);
st7735_WriteReg(LCD_REG_224, 0x39);
st7735_WriteReg(LCD_REG_224, 0x00);
st7735_WriteReg(LCD_REG_224, 0x01);
st7735_WriteReg(LCD_REG_224, 0x03);
st7735_WriteReg(LCD_REG_224, 0x10);
/* Sparkles and rainbows, 16 args, no delay */
st7735_WriteReg(LCD_REG_225, 0x03);
st7735_WriteReg(LCD_REG_225, 0x1d);
st7735_WriteReg(LCD_REG_225, 0x07);
st7735_WriteReg(LCD_REG_225, 0x06);
st7735_WriteReg(LCD_REG_225, 0x2E);
st7735_WriteReg(LCD_REG_225, 0x2C);
st7735_WriteReg(LCD_REG_225, 0x29);
st7735_WriteReg(LCD_REG_225, 0x2D);
st7735_WriteReg(LCD_REG_225, 0x2E);
st7735_WriteReg(LCD_REG_225, 0x2E);
st7735_WriteReg(LCD_REG_225, 0x37);
st7735_WriteReg(LCD_REG_225, 0x3F);
st7735_WriteReg(LCD_REG_225, 0x00);
st7735_WriteReg(LCD_REG_225, 0x00);
st7735_WriteReg(LCD_REG_225, 0x02);
st7735_WriteReg(LCD_REG_225, 0x10);
/* Normal display on, no args, no delay */
st7735_WriteReg(LCD_REG_19, 0x00);
/* Main screen turn on, no delay */
st7735_WriteReg(LCD_REG_41, 0x00);
/* Memory access control: MY = 1, MX = 1, MV = 0, ML = 0 */
st7735_WriteReg(LCD_REG_54, 0xC0);
}
/**
* @brief Enables the Display.
* @param None
* @retval None
*/
void st7735_DisplayOn(void)
{
uint8_t data = 0;
LCD_IO_WriteReg(LCD_REG_19);
LCD_Delay(10);
LCD_IO_WriteReg(LCD_REG_41);
LCD_Delay(10);
LCD_IO_WriteReg(LCD_REG_54);
data = 0xC0;
LCD_IO_WriteMultipleData(&data, 1);
}
/**
* @brief Disables the Display.
* @param None
* @retval None
*/
void st7735_DisplayOff(void)
{
uint8_t data = 0;
LCD_IO_WriteReg(LCD_REG_19);
LCD_Delay(10);
LCD_IO_WriteReg(LCD_REG_40);
LCD_Delay(10);
LCD_IO_WriteReg(LCD_REG_54);
data = 0xC0;
LCD_IO_WriteMultipleData(&data, 1);
}
/**
* @brief Sets Cursor position.
* @param Xpos: specifies the X position.
* @param Ypos: specifies the Y position.
* @retval None
*/
void st7735_SetCursor(uint16_t Xpos, uint16_t Ypos)
{
uint8_t data = 0;
LCD_IO_WriteReg(LCD_REG_42);
data = (Xpos) >> 8;
LCD_IO_WriteMultipleData(&data, 1);
data = (Xpos) & 0xFF;
LCD_IO_WriteMultipleData(&data, 1);
LCD_IO_WriteReg(LCD_REG_43);
data = (Ypos) >> 8;
LCD_IO_WriteMultipleData(&data, 1);
data = (Ypos) & 0xFF;
LCD_IO_WriteMultipleData(&data, 1);
LCD_IO_WriteReg(LCD_REG_44);
}
/**
* @brief Writes pixel.
* @param Xpos: specifies the X position.
* @param Ypos: specifies the Y position.
* @param RGBCode: the RGB pixel color
* @retval None
*/
void st7735_WritePixel(uint16_t Xpos, uint16_t Ypos, uint16_t RGBCode)
{
uint8_t data = 0;
if((Xpos >= ST7735_LCD_PIXEL_WIDTH) || (Ypos >= ST7735_LCD_PIXEL_HEIGHT))
{
return;
}
/* Set Cursor */
st7735_SetCursor(Xpos, Ypos);
data = RGBCode >> 8;
LCD_IO_WriteMultipleData(&data, 1);
data = RGBCode;
LCD_IO_WriteMultipleData(&data, 1);
}
/**
* @brief Writes to the selected LCD register.
* @param LCDReg: Address of the selected register.
* @param LCDRegValue: value to write to the selected register.
* @retval None
*/
void st7735_WriteReg(uint8_t LCDReg, uint8_t LCDRegValue)
{
LCD_IO_WriteReg(LCDReg);
LCD_IO_WriteMultipleData(&LCDRegValue, 1);
}
/**
* @brief Sets a display window
* @param Xpos: specifies the X bottom left position.
* @param Ypos: specifies the Y bottom left position.
* @param Height: display window height.
* @param Width: display window width.
* @retval None
*/
void st7735_SetDisplayWindow(uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height)
{
uint8_t data = 0;
/* Column addr set, 4 args, no delay: XSTART = Xpos, XEND = (Xpos + Width - 1) */
LCD_IO_WriteReg(LCD_REG_42);
data = (Xpos) >> 8;
LCD_IO_WriteMultipleData(&data, 1);
data = (Xpos) & 0xFF;
LCD_IO_WriteMultipleData(&data, 1);
data = (Xpos + Width - 1) >> 8;
LCD_IO_WriteMultipleData(&data, 1);
data = (Xpos + Width - 1) & 0xFF;
LCD_IO_WriteMultipleData(&data, 1);
/* Row addr set, 4 args, no delay: YSTART = Ypos, YEND = (Ypos + Height - 1) */
LCD_IO_WriteReg(LCD_REG_43);
data = (Ypos) >> 8;
LCD_IO_WriteMultipleData(&data, 1);
data = (Ypos) & 0xFF;
LCD_IO_WriteMultipleData(&data, 1);
data = (Ypos + Height - 1) >> 8;
LCD_IO_WriteMultipleData(&data, 1);
data = (Ypos + Height - 1) & 0xFF;
LCD_IO_WriteMultipleData(&data, 1);
}
/**
* @brief Draws horizontal line.
* @param RGBCode: Specifies the RGB color
* @param Xpos: specifies the X position.
* @param Ypos: specifies the Y position.
* @param Length: specifies the line length.
* @retval None
*/
void st7735_DrawHLine(uint16_t RGBCode, uint16_t Xpos, uint16_t Ypos, uint16_t Length)
{
uint8_t counter = 0;
if(Xpos + Length > ST7735_LCD_PIXEL_WIDTH) return;
/* Set Cursor */
st7735_SetCursor(Xpos, Ypos);
for(counter = 0; counter < Length; counter++)
{
ArrayRGB[counter] = RGBCode;
}
LCD_IO_WriteMultipleData((uint8_t*)&ArrayRGB[0], Length * 2);
}
/**
* @brief Draws vertical line.
* @param RGBCode: Specifies the RGB color
* @param Xpos: specifies the X position.
* @param Ypos: specifies the Y position.
* @param Length: specifies the line length.
* @retval None
*/
void st7735_DrawVLine(uint16_t RGBCode, uint16_t Xpos, uint16_t Ypos, uint16_t Length)
{
uint8_t counter = 0;
if(Ypos + Length > ST7735_LCD_PIXEL_HEIGHT) return;
for(counter = 0; counter < Length; counter++)
{
st7735_WritePixel(Xpos, Ypos + counter, RGBCode);
}
}
/**
* @brief Gets the LCD pixel Width.
* @param None
* @retval The Lcd Pixel Width
*/
uint16_t st7735_GetLcdPixelWidth(void)
{
return ST7735_LCD_PIXEL_WIDTH;
}
/**
* @brief Gets the LCD pixel Height.
* @param None
* @retval The Lcd Pixel Height
*/
uint16_t st7735_GetLcdPixelHeight(void)
{
return ST7735_LCD_PIXEL_HEIGHT;
}
/**
* @brief Displays a bitmap picture loaded in the internal Flash.
* @param BmpAddress: Bmp picture address in the internal Flash.
* @retval None
*/
void st7735_DrawBitmap(uint16_t Xpos, uint16_t Ypos, uint8_t *pbmp)
{
uint32_t index = 0, size = 0;
/* Read bitmap size */
size = *(volatile uint16_t *) (pbmp + 2);
size |= (*(volatile uint16_t *) (pbmp + 4)) << 16;
/* Get bitmap data address offset */
index = *(volatile uint16_t *) (pbmp + 10);
index |= (*(volatile uint16_t *) (pbmp + 12)) << 16;
size = (size - index)/2;
pbmp += index;
/* Set GRAM write direction and BGR = 0 */
/* Memory access control: MY = 0, MX = 1, MV = 0, ML = 0 */
st7735_WriteReg(LCD_REG_54, 0x40);
/* Set Cursor */
st7735_SetCursor(Xpos, Ypos);
LCD_IO_WriteMultipleData((uint8_t*)pbmp, size*2);
/* Set GRAM write direction and BGR = 0 */
/* Memory access control: MY = 1, MX = 1, MV = 0, ML = 0 */
st7735_WriteReg(LCD_REG_54, 0xC0);
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
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