SSD1309SPI口只能用R4吗

对于SSD1309 OLED显示屏的SPI接口，它不仅可以使用R4引脚，还可以使用其他引脚，具体取决于您的硬件设计。在使用SPI接口时，您需要确保将SDA（数据线）、SCL（时钟线）和CS（片选线）正确连接到相应的引脚。请参考SSD1309 OLED显示屏的数据手册或硬件设计指南，以获取准确的引脚连接信息。

相关问题

SSD1309SPI口可以用arduino uno R3吗

是的，SSD1309 OLED显示屏的SPI接口可以与Arduino Uno R3兼容。Arduino Uno R3板上有标准的SPI引脚（MISO、MOSI、SCK、SS），您可以将SSD1309 OLED显示屏的SPI接口连接到这些引脚上。请确保在代码中正确初始化和配置SPI接口，并在连接时参考SSD1309 OLED显示屏的引脚定义和数据手册。

SSD1309 SPI驱动代码

以下是一个基于STM32的SSD1309 SPI驱动代码示例：

#include "stm32f10x.h"
#include "stm32f10x_spi.h"

#define SSD1309_DC_PIN  GPIO_Pin_6
#define SSD1309_DC_PORT GPIOB

#define SSD1309_CS_PIN  GPIO_Pin_7
#define SSD1309_CS_PORT GPIOB

#define SSD1309_RST_PIN  GPIO_Pin_8
#define SSD1309_RST_PORT GPIOB

#define SSD1309_WIDTH    128
#define SSD1309_HEIGHT   64

static uint8_t ssd1309_buffer[SSD1309_WIDTH * SSD1309_HEIGHT / 8];

void ssd1309_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef  SPI_InitStructure;

    /* GPIO clock enable */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    /* SPI clock enable */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

    /* Configure SCK, MOSI and NSS pins as Alternate Function Push Pull */
    GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_13 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    /* Configure DC, CS and RST pins as Output Push Pull */
    GPIO_InitStructure.GPIO_Pin   = SSD1309_DC_PIN | SSD1309_CS_PIN | SSD1309_RST_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;
    GPIO_Init(SSD1309_DC_PORT, &GPIO_InitStructure);

    /* Set RST pin low to reset SSD1309 */
    GPIO_ResetBits(SSD1309_RST_PORT, SSD1309_RST_PIN);
    Delay(10);
    GPIO_SetBits(SSD1309_RST_PORT, SSD1309_RST_PIN);
    Delay(10);

    /* Configure SPI */
    SPI_InitStructure.SPI_Direction         = SPI_Direction_1Line_Tx;
    SPI_InitStructure.SPI_Mode              = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize          = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL              = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA              = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS               = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
    SPI_InitStructure.SPI_FirstBit          = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial     = 7;
    SPI_Init(SPI2, &SPI_InitStructure);

    /* Enable SPI */
    SPI_Cmd(SPI2, ENABLE);

    /* Initialize SSD1309 */
    ssd1309_command(0xAE); // Display off
    ssd1309_command(0xD5); // Set display clock divide ratio/oscillator frequency
    ssd1309_command(0x80); // Set divide ratio
    ssd1309_command(0xA8); // Set multiplex ratio
    ssd1309_command(0x3F); // Set to 64 COM lines
    ssd1309_command(0xD3); // Set display offset
    ssd1309_command(0x00); // No offset
    ssd1309_command(0x40); // Set display start line
    ssd1309_command(0x8D); // Charge pump
    ssd1309_command(0x14); // Enable charge pump
    ssd1309_command(0x20); // Set memory addressing mode
    ssd1309_command(0x00); // Horizontal addressing mode
    ssd1309_command(0xA0); // Set segment remap
    ssd1309_command(0xC8); // Set COM output scan direction
    ssd1309_command(0xDA); // Set COM pins hardware configuration
    ssd1309_command(0x12); // Alternative configuration
    ssd1309_command(0x81); // Set contrast control
    ssd1309_command(0xCF); // Set contrast
    ssd1309_command(0xD9); // Set pre-charge period
    ssd1309_command(0xF1); // Phase 1 period of 15 DCLKs, Phase 2 period of 1 DCLK
    ssd1309_command(0xDB); // Set VCOMH deselect level
    ssd1309_command(0x40); // 0.77*VCC
    ssd1309_command(0xA4); // Set entire display on/off
    ssd1309_command(0xA6); // Set normal display
    ssd1309_command(0xAF); // Display on
}

void ssd1309_command(uint8_t cmd)
{
    GPIO_ResetBits(SSD1309_DC_PORT, SSD1309_DC_PIN);
    GPIO_ResetBits(SSD1309_CS_PORT, SSD1309_CS_PIN);
    SPI_I2S_SendData(SPI2, cmd);
    while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_BSY) == SET);
    GPIO_SetBits(SSD1309_CS_PORT, SSD1309_CS_PIN);
}

void ssd1309_data(uint8_t *data, uint32_t size)
{
    GPIO_SetBits(SSD1309_DC_PORT, SSD1309_DC_PIN);
    GPIO_ResetBits(SSD1309_CS_PORT, SSD1309_CS_PIN);
    while (size--) {
        SPI_I2S_SendData(SPI2, *data++);
        while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_BSY) == SET);
    }
    GPIO_SetBits(SSD1309_CS_PORT, SSD1309_CS_PIN);
}

void ssd1309_display(void)
{
    ssd1309_command(0x21); // Set column address
    ssd1309_command(0x00); // Column start address
    ssd1309_command(0x7F); // Column end address

    ssd1309_command(0x22); // Set page address
    ssd1309_command(0x00); // Page start address
    ssd1309_command(0x07); // Page end address

    ssd1309_data(ssd1309_buffer, sizeof(ssd1309_buffer));
}

void ssd1309_clear(void)
{
    memset(ssd1309_buffer, 0, sizeof(ssd1309_buffer));
}

这个驱动代码基于STM32F10x系列芯片，使用SPI2控制SSD1309 OLED显示屏。在初始化函数`ssd1309_init()`中，首先配置GPIO和SPI，然后通过I/O口控制SSD1309的复位和初始化。接着，发送一系列命令配置SSD1309的工作模式和显示参数。在`ssd1309_command()`和`ssd1309_data()`函数中，使用SPI接口向SSD1309发送命令和数据。最后，`ssd1309_display()`函数将屏幕缓存中的数据写入SSD1309，`ssd1309_clear()`函数将屏幕缓存清空。