/*
连续读出ADXL345内部加速度数据，地址范围0x32~0x37
*/
void Multiple_read(short *x,short *y,short *z)
{
unsigned char i;
start_i2c(); //起始信号
sendbyte(ADXL_WRITE); //发送设备地址+写信号
i2c_Wait_Ack();
sendbyte(0x32);
i2c_Wait_Ack();
start_i2c(); //起始信号
sendbyte(ADXL_READ); //发送设备地址+读信号
i2c_Wait_Ack();
for (i=0; i<6; i++) //连续读取6个地址数据，存储中BUF
{
ADXL_BUF[i] = rcvbyte(); //BUF[0]存储0x32地址中的数据
if (i == 5)
{
send_ack(1); //最后一个数据需要回NOACK
}
else
{
send_ack(0); //回应ACK
}
}
stop_i2c( ); //停止信号
*x=(short)(((u16)ADXL_BUF[1]<<8)+ADXL_BUF[0]);
*y=(short)(((u16)ADXL_BUF[3]<<8)+ADXL_BUF[2]);
*z=(short)(((u16)ADXL_BUF[5]<<8)+ADXL_BUF[4]);
}
u8 Multiple_read_BH1750(void)
{ u8 i;
start_i2c(); //起始信号
sendbyte(SlaveAddress+1); //发送设备地址+读信号
i2c_Wait_Ack();
for (i=0; i<3; i++) //连续读取2个地址数据，存储中BUF
{
BUF[i] = rcvbyte(); //BUF[0]存储0x32地址中的数据
if (i == 3)
{
send_ack(1); //最后一个数据需要回NOACK
}
else
{
send_ack(0); //回应ACK
}
}
stop_i2c(); //停止信号
delay_ms(5);
return 1;
}
unsigned char Single_Read(unsigned char REG_Address)
{
unsigned char REG_data;
start_i2c(); //起始信号/
sendbyte(ADXL_WRITE); //发送设备地址+写信号
i2c_Wait_Ack();
sendbyte(REG_Address); //发送存储单元地址，从0开始
i2c_Wait_Ack();
start_i2c(); //起始信号
sendbyte(ADXL_READ); //发送设备地址+读信号
i2c_Wait_Ack();
REG_data=rcvbyte(); //读出寄存器数据
send_ack(1);
stop_i2c( ); //停止信号
return REG_data;
}
void Single_Write(unsigned char REG_Address,unsigned char REG_data)
{
start_i2c(); //起始信号
sendbyte(ADXL_WRITE); //发送设备地址+写信号
i2c_Wait_Ack();
sendbyte(REG_Address); //内部寄存器地址
i2c_Wait_Ack();
sendbyte(REG_data); //内部寄存器数据
i2c_Wait_Ack();
stop_i2c(); //发送停止信号+-+/
}
int Single_Write_BH1750(u8 REG_Address)
{
start_i2c(); //起始信号
sendbyte(SlaveAddress); //发送设备地址+写信号
i2c_Wait_Ack();
sendbyte(REG_Address); //内部寄存器地址，
i2c_Wait_Ack();
stop_i2c(); //发送停止信号
return 0;
}
void read_adc()
{
start_i2c();
shout_i2c(0x90); //device address and write mode
ack_i2c();
shout_i2c(0x01); //control byte
ack_i2c();
start_i2c();
shout_i2c(0x91); //device address and read mode
ack_i2c();
adc=shin_i2c();
nack_i2c();
stop_i2c();
}
static void write_i2c(uint8_t address, uint8_t value)
{
printf("writing 0x%02X at address 0x%02X\n", value, address);
output(1, 0, 1); usleep(100); /* Init */
output(1, 1, 1); usleep(2000);
start_i2c();
write_byte_i2c(I2C_DEVSEL_WR);
write_byte_i2c(address);
write_byte_i2c(value); usleep(2000);
stop_i2c();
usleep(2000);
}
