[AT-START-F425 Review] + Software and Hardware SPI Driver (ST7735) 1.8-inch TFT LCD

freeelectron

[AT-START-F425 Review] + Software and Hardware SPI Driver (ST7735) 1.8-inch TFT LCD [Copy link]

 

1. Hardware connection
GND GND
3.3V VCC
PA5 SCL
PA7 SDA
PB0 ERS (reset)
PB1 DC (command data selection)
PA4 CS (chip select)
PB2 BL (backlight)

2. Font library access method
: negative code, reverse, column-row mode,
use PCtoLCD2002 software to access.

3. Image acquisition:
horizontal scanning, 16-bit true color
using Image2Lcd acquisition

4. Code implementation
(1) The IO and SPI initialization
codes are compatible with both software SPI and hardware SPI, which are selected by the macro SOFTWARE_SPI_ENABLE .

void LcdIoInit(void)
{

        gpio_init_type gpio_init_struct;

        /* enable the led clock */
        crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);
        crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);


        /* set default parameter */
        gpio_default_para_init(&gpio_init_struct);



#if SOFTWARE_SPI_ENABLE        

        /* configure the led gpio */

        gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
        gpio_init_struct.gpio_out_type  = GPIO_OUTPUT_PUSH_PULL;
        gpio_init_struct.gpio_mode = GPIO_MODE_OUTPUT;
        gpio_init_struct.gpio_pins = GPIO_PINS_4|GPIO_PINS_5|GPIO_PINS_7;
        gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
        gpio_init(GPIOA, &gpio_init_struct);

        gpio_bits_set(GPIOA,GPIO_PINS_4|GPIO_PINS_5|GPIO_PINS_7);
#else        

        /*SPI1 :  

                PA4/CS  

                PA5/SCK    

                PA6/MISO   

                PA7/MOSI    

        */

       
        gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;
        gpio_init_struct.gpio_pull           = GPIO_PULL_UP;
        gpio_init_struct.gpio_mode           = GPIO_MODE_OUTPUT;
        gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
        gpio_init_struct.gpio_pins = GPIO_PINS_4;
        gpio_init(GPIOA, &gpio_init_struct);
        
        gpio_bits_set(GPIOA,GPIO_PINS_4);

        gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE5, GPIO_MUX_0);
        gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE6, GPIO_MUX_0);
        gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE7, GPIO_MUX_0);

        gpio_default_para_init(&gpio_init_struct);
        gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;
        gpio_init_struct.gpio_pull           = GPIO_PULL_DOWN;
        gpio_init_struct.gpio_mode           = GPIO_MODE_MUX;
        gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
        gpio_init_struct.gpio_pins = GPIO_PINS_5;
        gpio_init(GPIOA, &gpio_init_struct);


        gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;
        gpio_init_struct.gpio_pull           = GPIO_PULL_UP;
        gpio_init_struct.gpio_mode           = GPIO_MODE_MUX;
        gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
        gpio_init_struct.gpio_pins = GPIO_PINS_6;
        gpio_init(GPIOA, &gpio_init_struct);


        gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;
        gpio_init_struct.gpio_pull           = GPIO_PULL_UP;
        gpio_init_struct.gpio_mode           = GPIO_MODE_MUX;

        gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;

        gpio_init_struct.gpio_pins = GPIO_PINS_7;

        gpio_init(GPIOA, &gpio_init_struct);

        

        

        spi_init_type spi_init_struct;



        crm_periph_clock_enable(CRM_SPI1_PERIPH_CLOCK, TRUE);

  

        spi_default_para_init(&spi_init_struct);

        spi_init_struct.transmission_mode = SPI_TRANSMIT_HALF_DUPLEX_TX;

        spi_init_struct.master_slave_mode = SPI_MODE_MASTER;

        spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_2;

        spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_MSB;

        spi_init_struct.frame_bit_num = SPI_FRAME_8BIT;

        spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_HIGH;  //SPI_CLOCK_POLARITY_HIGH

        spi_init_struct.clock_phase = SPI_CLOCK_PHASE_2EDGE;       //SPI_CLOCK_PHASE_2EDGE

        spi_init_struct.cs_mode_selection = SPI_CS_SOFTWARE_MODE;

        spi_init(SPI1, &spi_init_struct);



        spi_enable(SPI1, TRUE);

        

#endif        

        

        gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;

        gpio_init_struct.gpio_out_type  = GPIO_OUTPUT_PUSH_PULL;

        gpio_init_struct.gpio_mode = GPIO_MODE_OUTPUT;

        gpio_init_struct.gpio_pins = GPIO_PINS_0|GPIO_PINS_1|GPIO_PINS_2;

        gpio_init_struct.gpio_pull = GPIO_PULL_NONE;

        gpio_init(GPIOB, &gpio_init_struct);

        

        gpio_bits_set(GPIOB,GPIO_PINS_0|GPIO_PINS_1|GPIO_PINS_2);

}

(2) SPI write data

void LCD_Writ_Bus(u8 dat) 
{        
        LCD_CS_LOW();

#if SOFTWARE_SPI_ENABLE        

        
        u8 i;
        for(i=0;i<8;i++)
        {                          
                LCD_SCLK_LOW();
                if(dat&0x80)
                {
                   LCD_MOSI_HIGH();
                }
                else
                {
                   LCD_MOSI_LOW();
                }
                LCD_SCLK_HIGH();
                dat<<=1;
        }
#else

    spi_i2s_data_transmit(SPI1, dat);

    while(spi_i2s_flag_get(SPI1, SPI_I2S_TDBE_FLAG) == RESET) {};
#endif        
        LCD_CS_HIGH();        
}

(3) Test code

void LcdTest(void)
{

        LcdInit();//LCD初始化
        LcdFill(0,0,LCD_W,LCD_H,BLACK);

        LcdShow16x16Hz(40, 0, 4, YELLOW, BLACK);
        LcdShow16x16Hz(56, 0, 5, YELLOW, BLACK);
        LcdShow16x16Hz(72, 0, 6, YELLOW, BLACK);

        LcdShowString(32,24,"AT32F425",BLUE, BLACK,16);
        LcdShowImage (14,60, 100, 93, gImage_zan);
}

5. Phenomenon

wangerxian

This color screen is nice. There should be a corresponding library for screen display, right?

freeelectron

wangerxian posted on 2022-5-23 18:52 This color screen is good. There should be a corresponding library for screen display, right?

The spi part is related to the specific mcu, and other initialization processes can be referred to the manufacturer.