【GD32L233C-START评测】12. 硬件IIC驱动OLED

void i2c_gpio_config(void)
{
	/* enable GPIOB clock */
    rcu_periph_clock_enable(RCU_GPIOB);
	
    /* connect PB10 to I2C1_SCL */
    gpio_af_set(GPIOB, GPIO_AF_4, GPIO_PIN_10);
    /* connect PB11 to I2C1_SDA */
    gpio_af_set(GPIOB, GPIO_AF_4, GPIO_PIN_11);
    /* configure GPIO pins of I2C1 */
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_10);
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_11);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_11);
}

2、初始化硬件IIC

初始化硬件IIC，需要设置:

IIC主机的IIC地址，设置位0x72，用宏I2C_OWN_ADDRESS7表示

IIC从机的IIC地址，也就是OLED的地址，位0x78，用宏I2C_SLAVE_OLED_ADDRESS7表示

硬件IIC每次传输的数据个数，OLED有写数据寄存器0x40和写命令寄存器0x00，每次需要想这两个寄存器中写入数据，所以是2个字节，用I2C_DATA_BYTES表示。

void i2c_config(void)
{
	/* enable I2C1 clock */
    rcu_periph_clock_enable(RCU_I2C1);
	
    /* configure I2C timing */
    i2c_timing_config(I2C1, 0, 0x3, 0);
    i2c_master_clock_config(I2C1, 0x13, 0x36);

    /* configure I2C address */
    i2c_address_config(I2C1, I2C_OWN_ADDRESS7, I2C_ADDFORMAT_7BITS);
    /* configure slave address */
    i2c_master_addressing(I2C1, I2C_SLAVE_OLED_ADDRESS7, I2C_MASTER_TRANSMIT);
    /* configure number of bytes to be transferred */
    i2c_transfer_byte_number_config(I2C1, I2C_DATA_BYTES);
    /* enable I2C1 */
    i2c_enable(I2C1);
}

3、OLED写命令与写数据函数实现

因为之前使用的是软件IIC，本次使用硬件IIC，所以我用了一个宏定义对硬件IIC代码和硬件IIC代码进行区分，需要使用硬件IIC或者软件IIC的时候只需要修改一些宏定义即可，如下：

#define OLED_IIC_TYPE_SW          0U  /*IIC for software*/
#define OLED_IIC_TYPE_HW          1U  /*IIC for hardware*/
#define OLED_IIC_TYPE             OLED_IIC_TYPE_HW

写数据函数实现：

void OLED_WrDat(unsigned char IIC_Data)
{
#if(OLED_IIC_TYPE == OLED_IIC_TYPE_HW)
	uint8_t i2c_transmitter[2]={0x40, IIC_Data};
	uint8_t i;
	
	i2c_transmitter[0] = 0x40;
	i2c_transmitter[1] = IIC_Data;
	    /* wait until I2C bus is idle */
    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));
    /* send a start condition to I2C bus */
    i2c_start_on_bus(I2C1);
    /* wait until the transmit data buffer is empty */
    I2C_STAT(I2C1) |= I2C_STAT_TBE;
    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));

    for(i = 0; i < 2; i++) {
        /* data transmission */
        i2c_data_transmit(I2C1, i2c_transmitter[i]);
        /* wait until the TI bit is set */
        while(!i2c_flag_get(I2C1, I2C_FLAG_TI));
    }
    /* wait for transfer complete flag */
    while(!i2c_flag_get(I2C1, I2C_FLAG_TC));
    /* send a stop condition to I2C bus */
    i2c_stop_on_bus(I2C1);
    /* wait until stop condition generate */
    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));
    /* clear the STPDET bit */
    i2c_flag_clear(I2C1, I2C_FLAG_STPDET);
#elif(OLED_IIC_TYPE == OLED_IIC_TYPE_SW)
	IIC_Start();
	IIC_Send_Byte(0x78);
	IIC_Wait_Ack();
	IIC_Send_Byte(0x40);			//write data
	IIC_Wait_Ack();
	IIC_Send_Byte(IIC_Data);
	IIC_Wait_Ack();
	IIC_Stop();
#endif
}

写命令函数实现

void OLED_WrCmd(unsigned char IIC_Command)
{
#if(OLED_IIC_TYPE == OLED_IIC_TYPE_HW)
	uint8_t i2c_transmitter[2]={0x00, IIC_Command};
	uint8_t i;
	
	i2c_transmitter[0] = 0x00;
	i2c_transmitter[1] = IIC_Command;
	    /* wait until I2C bus is idle */
    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));
    /* send a start condition to I2C bus */
    i2c_start_on_bus(I2C1);
    /* wait until the transmit data buffer is empty */
    I2C_STAT(I2C1) |= I2C_STAT_TBE;
    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));

    for(i = 0; i < 2; i++) {
        /* data transmission */
        i2c_data_transmit(I2C1, i2c_transmitter[i]);
        /* wait until the TI bit is set */
        while(!i2c_flag_get(I2C1, I2C_FLAG_TI));
    }
    /* wait for transfer complete flag */
    while(!i2c_flag_get(I2C1, I2C_FLAG_TC));
    /* send a stop condition to I2C bus */
    i2c_stop_on_bus(I2C1);
    /* wait until stop condition generate */
    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));
    /* clear the STPDET bit */
    i2c_flag_clear(I2C1, I2C_FLAG_STPDET);
#elif(OLED_IIC_TYPE == OLED_IIC_TYPE_SW)
	IIC_Start();
	IIC_Send_Byte(0x78);            //Slave address,SA0=0
	IIC_Wait_Ack();
	IIC_Send_Byte(0x00);			//write command
	IIC_Wait_Ack();
	IIC_Send_Byte(IIC_Command);
	IIC_Wait_Ack();
	IIC_Stop();
#endif
}

4、OLED显示代码

OLED的显示代码没有变化，直接参考我第6篇帖子即可：【GD32L233C-START评测】6. 获取RTC时间并通过OLED显示

四、效果展示

显示效果如下，视频拍倒了，见谅：

五、源代码

源代码分享如下，有需要的小伙伴可以参考。

GD32L233C_Prj_OLED_HW_IIC.zip (784.54 KB, 下载次数: 31)

xiaoming668

i2c_data_transmit(I2C1, i2c_transmitter);大佬，这句话在for循环里没有改数组索引，发的只是首地址的数据

【GD32L233C-START评测】12. 硬件IIC驱动OLED [复制链接]

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