[NUCLEO-L452RE Review] +2.2-inch TFT display driver display

jinglixixi

[NUCLEO-L452RE Review] +2.2-inch TFT display driver display [Copy link]

The previous article introduced using STM32L452RE to drive the OLED screen, but its screen is relatively small. This time, it will be used to drive a 2.2- inch TFT display.

Since the STM32L452RE development board is equipped with an Arduino interface, it is directly used to connect the TFT display. The connection relationship between the display and the MCU is:

CS---PA5

RST---PA6

D/C---PA7

SDI---PB6

SCK---PC7

LED---PA9

The statements for outputting high and low levels are defined as:

#define LCD_CS_High() HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET) // PA5

#define LCD_CS_Low() HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET)

#define LCD_REST_High() HAL_GPIO_WritePin(GPIOA,GPIO_PIN_6,GPIO_PIN_SET) // PA6

#define LCD_REST_Low() HAL_GPIO_WritePin(GPIOA,GPIO_PIN_6,GPIO_PIN_RESET)

#define LCD_DC_High() HAL_GPIO_WritePin(GPIOA,GPIO_PIN_7,GPIO_PIN_SET) // PA7

#define LCD_DC_Low() HAL_GPIO_WritePin(GPIOA,GPIO_PIN_7,GPIO_PIN_RESET)

#define LCD_SDI_High() HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_SET) // PB6

#define LCD_SDI_Low() HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_RESET)

#define LCD_SCK_High() HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_SET) // PC7

#define LCD_SCK_Low() HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_RESET)

#define LCD_LED_High() HAL_GPIO_WritePin(GPIOA,GPIO_PIN_9,GPIO_PIN_SET) // PA9

The configuration function of the pin output function is:

void APP_TFT_init(void)
{
 __HAL_RCC_GPIOA_CLK_ENABLE();
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 GPIO_InitStruct.Pin = GPIO_PIN_5;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 GPIO_InitStruct.Pin = GPIO_PIN_6;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_7;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_9;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
__HAL_RCC_GPIOB_CLK_ENABLE();
 GPIO_InitStruct.Pin = GPIO_PIN_6;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
__HAL_RCC_GPIOC_CLK_ENABLE();
 GPIO_InitStruct.Pin = GPIO_PIN_7;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 LCD_LED_High();
}

The function to realize the picture display is:

void show_pic(const unsigned char *p)
{
 int i,j;
 unsigned char picH,picL;
        Address_set(0,0,LCD_W-1,LCD_H-1);
 for(i=0;i<240;i++)
 {
 for(j=0;j<320;j++)
  {
  picH=*p++;
  picL=*p++;
  LCD_WR_DATA8(picH);
 LCD_WR_DATA8(picL);
  }
       }
}

The main program to achieve the display effect is:

int main(void)
{
 HAL_Init();
 /* Configure the system clock to 80 MHz */
 SystemClock_Config();
 APP_TFT_init();
 LCD_Init();
  //LCD_Clear(WHITE);
 show_pic(gImage_a);
 while (1);
}

After the program is compiled and downloaded, the display effect is as shown in the figure.

Display Effect

If the 2.2 -inch TFT display is still too small, we can add a 2.8 -inch touch screen later.

freebsder

The beauty is ok, but the resolution is not good.

jinglixixi

freebsder posted on 2020-12-25 18:24 The beauty is ok, but the resolution is not good.

What is the most basic resolution standard in your mind?

w494143467

I think this screen is more suitable for me. Haha!

jinglixixi

w494143467 posted on 2020-12-26 10:41 I think this screen is more suitable for me. Haha!

Yes, this screen can be directly plugged into the Arduino interface, which saves the wiring and is more convenient. The 2.8-inch touch screen is not possible, as some pins cannot be directly plugged into the socket, so it can only be connected by wire.

w494143467

jinglixixi posted on 2020-12-26 11:02 Yes, this screen can be directly plugged into the Arduino interface, which saves the wiring and is more convenient. The 2.8-inch touch screen is not good, as some pins cannot be directly plugged in...

SOGA, then I need a screen like this. I think many development boards now have Arduino interfaces.

jinglixixi

w494143467 Published on 2020-12-26 17:43 SOGA, then I need a screen like this. Many development boards should have Arduino interfaces now.

Yes, that's right.

okhxyyo

ST NUCLEO-L452RE review

Summary post: https://en.eeworld.com/bbs/thread-1151850-1-1.html、