// 读取DHT11传送的5个字节，但只返回湿度值
unsigned char getAllBytes(void)
{
unsigned char temp, loopCount;
unsigned char tempHHigh, tempHLow, tempTHigh, tempTLow, tempCheckSum;
unsigned char returnData;
//如果读取湿度不成功，则返回0xff，否则返回相对湿度值
returnData = 0xff;
//主机拉低20ms (要求大于18ms)
DHT11=0;
delay100us(200);
DHT11=1;
//总线由上拉电阻拉高 主机延时20us
delay10us();
delay10us();
delay10us();
delay10us();
//主机设为输入 判断从机响应信号
DHT11=1;
//判断从机是否有低电平响应信号 如不响应则跳出，响应则向下运行
if(!DHT11)
{
loopCount = 200;
//判断从机是否发出 80us 的低电平响应信号是否结束，或是否超时
while( !DHT11 && loopCount-- );
loopCount = 200;
//判断从机是否发出 80us 的高电平，如发出则进入数据接收状态，或是否超时
while( DHT11 && loopCount-- );
//数据接收状态
tempHHigh = getOneByte();
tempHLow = getOneByte();
tempTHigh = getOneByte();
tempTLow = getOneByte();
tempCheckSum = getOneByte();
DHT11=1;
//数据校验
temp = tempHHigh + tempHLow + tempTHigh + tempTLow;
if( temp == tempCheckSum && temp>0 )
{
// 数据有效 返回湿度
returnData = tempHHigh;
}
}// end if
return returnData;
}
void test_setOneByteWithWriteMask(void)
{
i2c_setRegister(4,0);
i2c_setRegisterReadWriteMasks(4,0x00,0xF0);
setOneByte(address,4,0xFF);
TEST_ASSERT_EQUAL_HEX8(0x0F,getOneByte(address,4));
}
void test_setOneByteIsCorrect(void)
{
setOneByte(address,1,43);
TEST_ASSERT_EQUAL_UINT8(43,getOneByte(address,1));
}
void test_getOneByteIsCorrect(void)
{
i2c_setRegister(3,26);
TEST_ASSERT_EQUAL_UINT8(26,getOneByte(address,3));
}
