GD32 硬件iic 读、写和快速读、写实现。

cp_srd

已于 2022-02-24 09:38:18 修改

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分类专栏： C/C++ 文章标签：单片机 gd32

于 2022-02-19 14:08:19 首次发布

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本文档分享了如何使用GD32F105VGT6微控制器配合MPU6050加速度计和陀螺仪进行I2C通信的初始化步骤，并提供了详细的寄存器操作函数，包括写入、读取单字节和批量数据。适合嵌入式开发人员参考。

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芯片:GD32F105VGT6
亲测可用，宏MPU_ADDR 根据电压决定，我这里是0x68。
初始化IO

void mpu6050_pin_init(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);
    rcu_periph_clock_enable(RCU_AF);
    rcu_periph_clock_enable(RCU_I2C1);
    gpio_init(GPIOB, GPIO_MODE_AF_OD, GPIO_OSPEED_2MHZ, GPIO_PIN_10 | GPIO_PIN_11);
    i2c_clock_config(I2C1, I2C1_SPEED, I2C_DTCY_2);		// I2C1_SPEED 可以是100K或者400K
    i2c_mode_addr_config(I2C1, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, MPU_ADDR);
    i2c_enable(I2C1);
    i2c_ack_config(I2C1, I2C_ACK_ENABLE);
}

写一个字节

uint8_t mpu_write_byte(uint8_t reg, uint8_t data)
{
    while (i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));
    i2c_start_on_bus(I2C1);
    while (!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));
    i2c_master_addressing(I2C1, MPU_ADDR << 1, I2C_TRANSMITTER);
    while (!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    while (SET != i2c_flag_get(I2C1, I2C_FLAG_TBE));
    i2c_data_transmit(I2C1, reg);
    while (!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    i2c_data_transmit(I2C1, data);
    while (!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    i2c_stop_on_bus(I2C1);
    while (I2C_CTL0(I2C1) & 0x0200);
}

读一个字节

uint8_t mpu_read_byte(uint8_t reg)
{
    uint8_t rx_data = 0;
    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));
    i2c_start_on_bus(I2C1);
    while (!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));
    i2c_master_addressing(I2C1, MPU_ADDR << 1, I2C_TRANSMITTER);
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));
    i2c_data_transmit(I2C1, reg);
    while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    i2c_start_on_bus(I2C1);
    while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));
    i2c_master_addressing(I2C1, MPU_ADDR << 1, I2C_RECEIVER);
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    while(!i2c_flag_get(I2C1, I2C_FLAG_RBNE));
    rx_data = i2c_data_receive(I2C1);
    i2c_ack_config(I2C1, I2C_ACK_DISABLE);
    i2c_stop_on_bus(I2C1);
    while (I2C_CTL0(I2C1) & 0x0200);
}

快速写

uint8_t mpu_write_len(uint8_t addr, uint8_t reg, uint8_t len, uint8_t *buf)
{
    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));
    i2c_start_on_bus(I2C1);
    while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));
    i2c_master_addressing(I2C1, addr << 1, I2C_TRANSMITTER);
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));
    i2c_data_transmit(I2C1, reg);
    while(!i2c_flag_get(I2C1 , I2C_FLAG_BTC));
    while(len){
        i2c_data_transmit(I2C1, *buf);
        buf++;
        len--;
        while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    }
    i2c_stop_on_bus(I2C1);
    while(I2C_CTL0(I2C1)&0x0200);
    return 0;
}

快速读

uint8_t mpu_read_len(uint8_t addr, uint8_t reg, uint8_t len, uint8_t *buf)
{
    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));
    i2c_start_on_bus(I2C1);
    while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));
    i2c_master_addressing(I2C1, addr << 1, I2C_TRANSMITTER);
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));
    i2c_data_transmit(I2C1, reg);
    while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    i2c_start_on_bus(I2C1);
    while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));
    /* send slave address to I2C bus */
    i2c_master_addressing(I2C1, addr << 1, I2C_RECEIVER);
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    i2c_ackpos_config(I2C1, I2C_ACKPOS_NEXT);	// 这一步是关键
    while(len){
        if (1 == len){
            i2c_ackpos_config(I2C1, I2C_ACKPOS_CURRENT);	// 这一步是关键
            i2c_ack_config(I2C1, I2C_ACK_DISABLE);
        }
        if (i2c_flag_get(I2C1, I2C_FLAG_RBNE)){
            *buf = i2c_data_receive(I2C1);
            i2c_ack_config(I2C1, I2C_ACK_ENABLE);
            buf++;
            len--;
        }
    }
    i2c_stop_on_bus(I2C1);
    while(I2C_CTL0(I2C1) & 0x0200);
    return 0;
}