【GD32F310G-START】OLED HELLO EEWORLD——Hardware I2C

lugl4313820

【GD32F310G-START】OLED HELLO EEWORLD——Hardware I2C [Copy link]

【GD32F310G-START】HELLO WORLD - GD32 MCU - Electronic Engineering World - Forum (eeworld.com.cn)

Following the serial port driver, after a night of hard work, I finally drove the hardware I2C and submitted the project to everyone using the actual SSD1306:

The actual initialization of hardware I2C is divided into three steps

1. Turn on the clock of GPIO and I2C0:

/*!
  \brief enable the peripheral clock
  \param[in] none
  \param[out] none
  \retval none
*/
static void rcu_config(void)
{
    /* enable GPIOB clock */
    rcu_periph_clock_enable(RCU_GPIOB);
    /* enable I2C0 clock */
    rcu_periph_clock_enable(RCU_I2C0);

}

2. Configure IO output:


/*!
  \brief configure the GPIO ports
  \param[in] none
  \param[out] none
  \retval none
*/
static void gpio_config(void)
{
    /* connect PB6 to I2C0_SCL */
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_6);
    /* connect PB7 to I2C0_SDA */
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_7);
    /* cofigure GPIO pins of I2C0 */
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_6);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_6);
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_7);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_7);
}

3. Configure I2C output mode, slave address, etc.

/*!
  \brief   configure the I2C0 and I2C1 inter faces
  \param[in] none
  \param[out] none
  \retval none
*/
static void i2c_config(void)
{
    /* I2C clock configure */
    i2c_clock_config(I2C0, 100000, I2C_DTCY_2);
    /* I2C address configure */
    i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C0_SLAVE_ADDRESS7);
    /* enable I2C0 */
    i2c_enable(I2C0);
    /* enable acknowledge */
    i2c_ack_config(I2C0, I2C_ACK_ENABLE);
}

4. Send data:

/*!
  \brief   I2C0发送数据
  \param[in] 需要发送的buff
  \param[in] 发送数据的长度
  \param[in] 从机地址
  \param[out] 向从机发送len长度的数据
  \retval none
*/
void i2c0_send(uint8_t *buff, int len, uint16_t slave_address)
{
  int i;
      /* wait until I2C bus is idle */
    while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));
    /* send a start condition to I2C0 bus */
    i2c_start_on_bus(I2C0);
    /* wait until SBSEND bit is set */
    while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));
    /* send slave address to I2C bus */
    i2c_master_addressing(I2C0, slave_address, I2C_TRANSMITTER);
    /* wait until ADDSEND bit is set */
    while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));
    /* clear ADDSEND bit */
    i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
    /* wait until the transmit data buffer is empty */
    while(!i2c_flag_get(I2C0, I2C_FLAG_TBE));

    for(i = 0; i < len; i++)
    {
        /* data transmission */
        i2c_data_transmit(I2C0, buff[i]);
        /* wait until the TBE bit is set */
        while(!i2c_flag_get(I2C0, I2C_FLAG_TBE));
    }
    /* send a stop condition to I2C bus */
    i2c_stop_on_bus(I2C0);
    while(I2C_CTL0(I2C0) & 0x0200);
}

Yesterday I typed it word by word based on other libraries of GD, which deepened my impression of the initialization and use of I2C. I found that if I have time, I still have to type it myself, even if I copy others.

Then I wrote the SSD1306 driver again. Now it is shown as follows:

I'll share the project package with you:

Template-i2c.7z (487.27 KB, downloads: 20)
I always thought I could just copy the homework and use it. Now I think, don't use CTRL+C or CTRL+V. Type one word at a time, and it will leave a deep impression. But it's just a waste of time. Yesterday, I accidentally reached 12 o'clock and missed a sentence. I couldn't find it on the oscilloscope or analyzer. I couldn't sleep all night. I got up at 6 o'clock in the morning to continue. I found the reason when I was awake: a stop signal was not given. . .

Alas, it is not easy. Please give a thumbs up and buy SPI below.

okhxyyo

I give you a thumbs up! Take care of yourself and go to bed early at night, don't stay up too late

lugl4313820

okhxyyo posted on 2022-5-5 21:39 I give you a thumbs up! Take care of yourself, and go to bed early at night, don't stay up too late

Thank you for your concern! I can't handle SPI + LCD today, so I plan to take a rest early. I will continue tomorrow.

soso

It's hard work, pay attention to the combination of work and rest. Thumbs up.

【GD32F310G-START】OLED HELLO EEWORLD——Hardware I2C [Copy link]

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