SPMOD - LCD 1.14

Outline

SPMOD_LCD1.14(1.14 inch LCD) uses ST7735S TFT LCD.

SPMOD - LCD1.14 Introduction

• Using Sipeed-SPMOD interface(2.54mm * 8PIN )，unified MaixPy board interface
• Using common LCD driver IC ST7735S(4-wire SPI communicate)
• Display Resolution:240*135
• Size:35.0*20.0mm

ST7735S TFT LCD Introduction

DC/DC Converter,

Adjustable VCOM Generation,
Non-volatile (NV) Memory to Store Initial Register Setting,
Oscillator for Display Clock Generation,
Factory default value (module ID, module version, etc) are stored in NV memory,
Timing Controller,

SPMOD_LCD1.14 pin description :

• Mode of connection:

Usage

• Process
  1. Send AT instruction
  2. Receive the reply
  3. Determines whether the setup was successful

C :

fpioa_set_function(SPI_IPS_LCD_CS_PIN_NUM, FUNC_SPI1_SS0);   // SPI_IPS_LCD_CS_PIN_NUM: 20;
fpioa_set_function(SPI_IPS_LCD_SCK_PIN_NUM, FUNC_SPI1_SCLK); // SPI_IPS_LCD_SCK_PIN_NUM: 21;
fpioa_set_function(SPI_IPS_LCD_MOSI_PIN_NUM, FUNC_SPI1_D0);  // SPI_IPS_LCD_MOSI_PIN_NUM: 8;
fpioa_set_function(SPI_IPS_LCD_DC_PIN_NUM, FUNC_GPIOHS0 + SPI_IPS_LCD_DC_GPIO_NUM);   // SPI_IPS_LCD_DC_PIN_NUM: 15; SPI_IPS_LCD_DC_GPIO_NUM: 15;
fpioa_set_function(SPI_IPS_LCD_RST_PIN_NUM, FUNC_GPIOHS0 + SPI_IPS_LCD_RST_GPIO_NUM); // SPI_IPS_LCD_RST_PIN_NUM: 7; SPI_IPS_LCD_RST_GPIO_NUM: 7;
fpioa_set_function(SPI_IPS_LCD_BL_PIN_NUM, FUNC_GPIOHS0 + SPI_IPS_LCD_BL_GPIO_NUM);   // SPI_IPS_LCD_BL_PIN_NUM: 6; SPI_IPS_LCD_BL_GPIO_NUM: 6;

// set gpiohs work mode to output mode
gpiohs_set_drive_mode(SPI_IPS_LCD_DC_GPIO_NUM, GPIO_DM_OUTPUT);
gpiohs_set_drive_mode(SPI_IPS_LCD_RST_GPIO_NUM, GPIO_DM_OUTPUT);
gpiohs_set_drive_mode(SPI_IPS_LCD_BL_GPIO_NUM, GPIO_DM_OUTPUT);

spi_init(1, SPI_WORK_MODE_0, SPI_FF_STANDARD, DATALENGTH, 0);

ips_lcd_init(); // init
LCD_ShowPicture(0, 0, LCD_W, LCD_H, gImage_nanke); // display

MaixPy :

# 20: SPI_LCD_CS_PIN_NUM;
fm.register(SPI_LCD_CS_PIN_NUM, fm.fpioa.GPIOHS20, force=True)
# 15: SPI_LCD_DC_PIN_NUM;
fm.register(SPI_LCD_DC_PIN_NUM, fm.fpioa.GPIOHS15, force=True)
# 6: SPI_LCD_BUSY_PIN_NUM;
fm.register(SPI_LCD_BUSY_PIN_NUM, fm.fpioa.GPIOHS6, force=True)
# 7: SPI_LCD_RST_PIN_NUM;
fm.register(SPI_LCD_RST_PIN_NUM, fm.fpioa.GPIOHS7, force=True)

# set gpiohs work mode to output mode
cs = GPIO(GPIO.GPIOHS20, GPIO.OUT)
dc = GPIO(GPIO.GPIOHS15, GPIO.OUT)
busy = GPIO(GPIO.GPIOHS6, GPIO.OUT)
rst = GPIO(GPIO.GPIOHS7, GPIO.OUT)

# 21: SPI_LCD_SCK_PIN_NUM; 8: SPI_LCD_MOSI_PIN_NUM;
spi1 = SPI(SPI_LCD_NUM, mode=SPI.MODE_MASTER, baudrate=SPI_LCD_FREQ_KHZ * 1000,
            polarity=0, phase=0, bits=8, firstbit=SPI.MSB, sck=SPI_LCD_SCK_PIN_NUM, mosi=SPI_LCD_MOSI_PIN_NUM)

ips = SPLCD114(spi1, cs, dc, rst, busy, IPS_WIDTH, IPS_HEIGHT, IPS_MODE)

# create an 'image' and fill it
img = image.Image()
img.draw_rectangle(80, 80, 30, 30)

# display
ips.display(img)

Runtime environments

The MaixPy firmware is recommended to compile from the latest source

Result

• C

  

• MaixPy

  

Transplant

The following parameters need to be modified.

• C

  // board_config.h
  #define SPI_INDEX           1
  #define SPI_SCLK_RATE       600*1000
  #define SPI_CHIP_SELECT_NSS 0 // SPI_CHIP_SELECT_0

  #define SPI_IPS_LCD_CS_PIN_NUM      20
  #define SPI_IPS_LCD_SCK_PIN_NUM     21
  #define SPI_IPS_LCD_MOSI_PIN_NUM    8

  #define SPI_IPS_LCD_DC_PIN_NUM     15
  #define SPI_IPS_LCD_BL_PIN_NUM      6
  #define SPI_IPS_LCD_RST_PIN_NUM     7

  #define SPI_IPS_LCD_DC_GPIO_NUM     15
  #define SPI_IPS_LCD_BL_GPIO_NUM     6
  #define SPI_IPS_LCD_RST_GPIO_NUM    7

  #define USE_HORIZONTAL 3    // 0/1 is horizontal, and 2/3 is vertical.

• Maixpy

  ################### config ###################
  SPI_LCD_NUM = SPI.SPI1
  SPI_LCD_DC_PIN_NUM = const(15)
  SPI_LCD_BUSY_PIN_NUM = const(6)
  SPI_LCD_RST_PIN_NUM = const(7)
  SPI_LCD_CS_PIN_NUM = const(20)
  SPI_LCD_SCK_PIN_NUM = const(21)
  SPI_LCD_MOSI_PIN_NUM = const(8)
  SPI_LCD_FREQ_KHZ = const(600)
  ##############################################

Outlook

• SPMOD_LCD1.14 Size drawing:

Resource Link