Sample code for 2.8" IPS TFT - ST7789 controller.
//---------------------------------------------------------
/*
(c)2019 Newhaven Display International, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
//---------------------------------------------------------
/*******************************************************************************
* Function Name : TFT_28_7789_Init
* Description : Initializes LCD with built-in ST7789S controller.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void TFT_28_7789_Init(void)
{
int n;
GPIO_ResetBits(GPIOC, CS1);
GPIO_SetBits(GPIOC, nRD);
GPIO_ResetBits(GPIOC, nWR);
GPIO_WriteBit(GPIOC, RES, Bit_RESET);
TFT_delay(100);
GPIO_WriteBit(GPIOC, RES, Bit_SET);
TFT_delay(100);
TFT_28_7789_Write_Command(0x0011);//exit SLEEP mode
TFT_delay(100);
TFT_28_7789_Write_Command(0x0036);TFT_28_7789_Write_Data(0x0080);//MADCTL: memory data access control
TFT_28_7789_Write_Command(0x003A);TFT_28_7789_Write_Data(0x0066);//COLMOD: Interface Pixel format *** I use 262K-colors in 18bit/pixel format when using 8-bit interface to allow 3-bytes per pixel
//TFT_28_7789_Write_Command(0x003A);TFT_28_7789_Write_Data(0x0055);//COLMOD: Interface Pixel format *** I use 65K-colors in 16bit/pixel (5-6-5) format when using 16-bit interface to allow 1-byte per pixel
TFT_28_7789_Write_Command(0x0021);//INVON: Display Inversion ON (setting for IPS)
TFT_28_7789_Write_Command(0x00B2);TFT_28_7789_Write_Data(0x000C);TFT_28_7789_Write_Data(0x0C);TFT_28_7789_Write_Data(0x00);TFT_28_7789_Write_Data(0x33);TFT_28_7789_Write_Data(0x33);//PORCTRK: Porch setting
TFT_28_7789_Write_Command(0x00B7);TFT_28_7789_Write_Data(0x0035);//GCTRL: Gate Control
TFT_28_7789_Write_Command(0x00BB);TFT_28_7789_Write_Data(0x002B);//VCOMS: VCOM setting
TFT_28_7789_Write_Command(0x00C0);TFT_28_7789_Write_Data(0x002C);//LCMCTRL: LCM Control
TFT_28_7789_Write_Command(0x00C2);TFT_28_7789_Write_Data(0x0001);TFT_28_7789_Write_Data(0xFF);//VDVVRHEN: VDV and VRH Command Enable
TFT_28_7789_Write_Command(0x00C3);TFT_28_7789_Write_Data(0x0011);//VRHS: VRH Set
TFT_28_7789_Write_Command(0x00C4);TFT_28_7789_Write_Data(0x0020);//VDVS: VDV Set
TFT_28_7789_Write_Command(0x00C6);TFT_28_7789_Write_Data(0x000F);//FRCTRL2: Frame Rate control in normal mode
TFT_28_7789_Write_Command(0x00D0);TFT_28_7789_Write_Data(0x00A4);TFT_28_7789_Write_Data(0xA1);//PWCTRL1: Power Control 1
TFT_28_7789_Write_Command(0x00E0);TFT_28_7789_Write_Data(0x00D0);
TFT_28_7789_Write_Data(0x0000);
TFT_28_7789_Write_Data(0x0005);
TFT_28_7789_Write_Data(0x000E);
TFT_28_7789_Write_Data(0x0015);
TFT_28_7789_Write_Data(0x000D);
TFT_28_7789_Write_Data(0x0037);
TFT_28_7789_Write_Data(0x0043);
TFT_28_7789_Write_Data(0x0047);
TFT_28_7789_Write_Data(0x0009);
TFT_28_7789_Write_Data(0x0015);
TFT_28_7789_Write_Data(0x0012);
TFT_28_7789_Write_Data(0x0016);
TFT_28_7789_Write_Data(0x0019);//PVGAMCTRL: Positive Voltage Gamma control
TFT_28_7789_Write_Command(0x00E1);TFT_28_7789_Write_Data(0x00D0);
TFT_28_7789_Write_Data(0x0000);
TFT_28_7789_Write_Data(0x0005);
TFT_28_7789_Write_Data(0x000D);
TFT_28_7789_Write_Data(0x000C);
TFT_28_7789_Write_Data(0x0006);
TFT_28_7789_Write_Data(0x002D);
TFT_28_7789_Write_Data(0x0044);
TFT_28_7789_Write_Data(0x0040);
TFT_28_7789_Write_Data(0x000E);
TFT_28_7789_Write_Data(0x001C);
TFT_28_7789_Write_Data(0x0018);
TFT_28_7789_Write_Data(0x0016);
TFT_28_7789_Write_Data(0x0019);//NVGAMCTRL: Negative Voltage Gamma control
TFT_28_7789_Write_Command(0x002A);TFT_28_7789_Write_Data(0x0000);TFT_28_7789_Write_Data(0x0000);TFT_28_7789_Write_Data(0x0000);TFT_28_7789_Write_Data(0x00EF);//X address set
TFT_28_7789_Write_Command(0x002B);TFT_28_7789_Write_Data(0x0000);TFT_28_7789_Write_Data(0x0000);TFT_28_7789_Write_Data(0x0001);TFT_28_7789_Write_Data(0x003F);//Y address set
TFT_delay(10);
}
/*******************************************************************************
* Function Name : TFT_28_7789_Write_Command
* Description : writes a 1 byte command to 2.8" TFT.
* Input : command = one byte command (register address)
* Output : None
* Return : None
*******************************************************************************/
void TFT_28_7789_Write_Command(unsigned int command)
{
GPIO_ResetBits(GPIOC, CS1);
GPIO_ResetBits(GPIOC, RS);
GPIO_SetBits(GPIOC, nRD);
GPIO_ResetBits(GPIOC, nWR);
GPIO_Write(GPIOB, command);//when using 16-bit interface (DB17:10,DB8:1)//when using 8-bit interface (DB17:10)
TFT_delay(10);
GPIO_SetBits(GPIOC, nWR);
TFT_delay(1);
}
/*******************************************************************************
* Function Name : TFT_28_7789_Write_Data
* Description : writes 1 byte of data to 2.8" TFT.
* Input : data1 = one byte of display data or command parameter
* Output : None
* Return : None
*******************************************************************************/
void TFT_28_7789_Write_Data(unsigned int data1)
{
GPIO_Write(GPIOB, data1);//when using 16-bit interface (DB17:10,DB8:1)//when using 8-bit interface (DB17:10)
GPIO_SetBits(GPIOC, RS);
GPIO_ResetBits(GPIOC, nWR);
TFT_delay(1);
GPIO_SetBits(GPIOC, nWR);
}
/*******************************************************************************
* Function Name : TFT_28_7789_demo
* Description : Loads bmp from SD card and writes to NHD-2.8-240320AF-CSXP-F.
* Input : None
* Output : None
* Return : 1-end of function reached
*******************************************************************************/
int TFT_28_7789_demo(void)
{
GPIO_SetBits(GPIOC, IM0); //8-bit mode
//GPIO_ResetBits(GPIOC, IM0); //16-bit mode
TFT_28_7789_Init();
TFT_28S_Write_Command(0x002C); //Memory write
for (n=0;n<3;n++){
memset(RGB16,0x0000,sizeof(RGB16));
for (i=0;i<25600;i++) //for each 24-bit pixel...
{
f_read(&File1, &blue, 1, &blen); //read the blue 8-bits
f_read(&File1, &green, 1, &blen); //read the green 8-bits
f_read(&File1, &red, 1, &blen); //read the red 8-bits
/* un-comment below for 8-bit interface */
GPIO_SetBits(GPIOC, RS);
GPIO_Write(GPIOB, red);
GPIO_ResetBits(GPIOC, nWR);
GPIO_SetBits(GPIOC, nWR);
GPIO_Write(GPIOB, green);
GPIO_ResetBits(GPIOC, nWR);
GPIO_SetBits(GPIOC, nWR);
GPIO_Write(GPIOB, blue);
GPIO_ResetBits(GPIOC, nWR);
GPIO_SetBits(GPIOC, nWR);
/* END of 8-bit interface */
/* un-comment below for 16-bit interface */
//
// red=red>>3; //shift down to 5-bits
// green=green>>2; //shift down to 6-bits
// blue=blue>>3; //shift down to 5-bits
// RGB16[i]= (RGB16[i] | red); //put red 5-bits into int
// RGB16[i]= (RGB16[i] << 6); //move red bits over, make room for green
// RGB16[i]= (RGB16[i] | green); //put green 6-bits into int
// RGB16[i]= (RGB16[i] << 5); //move red and green bits over, make room for blue
// RGB16[i]= (RGB16[i] | blue); //put blue 5-bits into int
// GPIO_Write(GPIOB, RGB16[i]);
// GPIO_SetBits(GPIOC, RS);
// GPIO_ResetBits(GPIOC, nWR);
// GPIO_SetBits(GPIOC, nWR);
//
/* END of 16-bit interface */
}
}
TFT_28_7789_Write_Command(0x0029); //display ON
return 1;
}