【STM32C031 评测】基于spi接口驱动OLED显示测试

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落花又见流水发布时间：2024-3-23 17:45

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文章简介:	STM32C031基于spi接口驱动OLED显示测试。

本次来测试一下STM32C031的SPI接口使用。使用SPI接口oled，驱动oled显示。

OLED使用如下端口：

OLED-D0-->PA7 MOSI

OLED-D1-->PA5 SCK

OLED-CS-->PB0 CS

OLED-RES-->PA9 复位脚

OLED-DC-->PC7 dc控制脚

使用扩展板连接OLED，实物如下：

下面打开STM32CubeMX。在原来的基础工程上，额外使能SPI1模式，以及IO端口初始化。

SPI的参数设置。

设置完成后GENERATE CODE生成代码工程，然后移植OLED驱动。

下面是基于SPI发送数据写oled寄存器。

void ssd1306_Reset(void) 
{
    // CS = High (not selected)
    HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET);

    // Reset the OLED
    HAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_RESET);
    ssd1306_mdelay(10);
    HAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_SET);
    ssd1306_mdelay(10);
}

// Send a byte to the command register
void ssd1306_WriteCommand(uint8_t byte) 
{
    HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLED
    HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET); // command
    HAL_SPI_Transmit(&SSD1306_SPI_PORT, (uint8_t *) &byte, 1, HAL_MAX_DELAY);
    HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}

// Send data
void ssd1306_WriteData(uint8_t* buffer, size_t buff_size) 
{
    HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLED
    HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_SET); // data
    HAL_SPI_Transmit(&SSD1306_SPI_PORT, buffer, buff_size, HAL_MAX_DELAY);
    HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}
// Initialize the oled screen
void ssd1306_Init(void) 
{
    // Reset OLED
    ssd1306_Reset();

    // Wait for the screen to boot
    ssd1306_mdelay(100);

    // Init OLED
    ssd1306_SetDisplayOn(0); //display off

    ssd1306_WriteCommand(0x20); //Set Memory Addressing Mode
    ssd1306_WriteCommand(0x00); // 00b,Horizontal Addressing Mode; 01b,Vertical Addressing Mode;
                                // 10b,Page Addressing Mode (RESET); 11b,Invalid

    ssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7

#ifdef SSD1306_MIRROR_VERT
    ssd1306_WriteCommand(0xC0); // Mirror vertically
#else
    ssd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
#endif

    ssd1306_WriteCommand(0x00); //---set low column address
    ssd1306_WriteCommand(0x10); //---set high column address

    ssd1306_WriteCommand(0x40); //--set start line address - CHECK

    ssd1306_SetContrast(0xFF);

#ifdef SSD1306_MIRROR_HORIZ
    ssd1306_WriteCommand(0xA0); // Mirror horizontally
#else
    ssd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127 - CHECK
#endif

#ifdef SSD1306_INVERSE_COLOR
    ssd1306_WriteCommand(0xA7); //--set inverse color
#else
    ssd1306_WriteCommand(0xA6); //--set normal color
#endif

// Set multiplex ratio.
#if (SSD1306_HEIGHT == 128)
    // Found in the Luma Python lib for SH1106.
    ssd1306_WriteCommand(0xFF);
#else
    ssd1306_WriteCommand(0xA8); //--set multiplex ratio(1 to 64) - CHECK
#endif

#if (SSD1306_HEIGHT == 32)
    ssd1306_WriteCommand(0x1F); //
#elif (SSD1306_HEIGHT == 64)
    ssd1306_WriteCommand(0x3F); //
#elif (SSD1306_HEIGHT == 128)
    ssd1306_WriteCommand(0x3F); // Seems to work for 128px high displays too.
#else
#error "Only 32, 64, or 128 lines of height are supported!"
#endif

    ssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content

    ssd1306_WriteCommand(0xD3); //-set display offset - CHECK
    ssd1306_WriteCommand(0x00); //-not offset

    ssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequency
    ssd1306_WriteCommand(0xF0); //--set divide ratio

    ssd1306_WriteCommand(0xD9); //--set pre-charge period
    ssd1306_WriteCommand(0x22); //

    ssd1306_WriteCommand(0xDA); //--set com pins hardware configuration - CHECK
#if (SSD1306_HEIGHT == 32)
    ssd1306_WriteCommand(0x02);
#elif (SSD1306_HEIGHT == 64)
    ssd1306_WriteCommand(0x12);
#elif (SSD1306_HEIGHT == 128)
    ssd1306_WriteCommand(0x12);
#else
#error "Only 32, 64, or 128 lines of height are supported!"
#endif

    ssd1306_WriteCommand(0xDB); //--set vcomh
    ssd1306_WriteCommand(0x20); //0x20,0.77xVcc

    ssd1306_WriteCommand(0x8D); //--set DC-DC enable
    ssd1306_WriteCommand(0x14); //
    ssd1306_SetDisplayOn(1); //--turn on SSD1306 panel

    // Clear screen
    ssd1306_Fill(Black);

    // Flush buffer to screen
    ssd1306_UpdateScreen();

    // Set default values for screen object
    SSD1306.CurrentX = 0;
    SSD1306.CurrentY = 0;

    SSD1306.Initialized = 1;
}

下面测试oled显示字符效果：

在main中编写oled显示代码如下：