Exemplos de I2c_read_byte em C++ (Cpp)

Exemplo n.º 1

Arquivo: pix_i2c.c Projeto: TOPEET-Develop/iTop4412_kernel_public_merge

unsigned char I2c_read(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo)
{
    int i;
    I2c_start();
    I2C_DELAY;
    if(I2c_write_byte(device_addr)) {
        I2c_stop();
        DPRINTK("Fail to write device addr\n");
        return ERROR_CODE_READ_ADDR;
    }
    if(I2c_write_byte(sub_addr)) {
        I2c_stop();
        DPRINTK("Fail to write sub addr\n");
        return ERROR_CODE_READ_ADDR;
    }
    I2c_start();
    I2C_DELAY;
    if(I2c_write_byte(device_addr+1)) {
        I2c_stop();
        DPRINTK("Fail to write device addr+1\n");
        return ERROR_CODE_READ_ADDR;
    }
    for(i = 0; i<ByteNo; i++) buff[i] = I2c_read_byte();
    I2C_DELAY;
    I2C_DELAY_LONG;
    I2c_stop();
    I2C_DELAY_LONG;
    return ERROR_CODE_TRUE;
}

Exemplo n.º 2

Arquivo: gpio-i2c.c Projeto: Rasfunk/lenovo_a1_07_kernel

unsigned char I2c_read(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo)
{
    int i;
    nack_flag = ByteNo - 1;
    I2c_start();
    I2C_DELAY;
    if(I2c_write_byte(device_addr)) {
        I2c_stop();
        printk("Fail to write device addr\n");
        return ERROR_CODE_READ_ADDR;
    }
    if(I2c_write_byte(sub_addr)) {
        I2c_stop();
        printk("Fail to write sub addr\n");
        return ERROR_CODE_READ_ADDR;
    }
    #if 1
//    printk("=========i2c_start===\n");
    I2c_start();
    I2C_DELAY;
    if(I2c_write_byte(device_addr+1)) {
        I2c_stop();
        printk("Fail to write device addr+1\n");
        return ERROR_CODE_READ_ADDR;
    }
    for(i = 0; i<ByteNo; i++) buff[i] = I2c_read_byte(i);
    I2C_DELAY;
    I2C_DELAY_LONG;
    I2c_stop();
    I2C_DELAY_LONG;
   #endif
   printk("buff[0] = %d,buff[1] = %d\n",buff[0],buff[1]);
    return ERROR_CODE_TRUE;
}