uint16_t srf08GetDistance(uint8_t echo)
{
// valid range is [0, 16]
if(echo > 16)
echo = 16;
i2cStart();
i2cTransmit(currentAddress);
i2cTransmit(2 + echo * 2); // select the correct distance register
i2cStart();
i2cTransmit(currentAddress + 1);
uint16_t distance = i2cReceive(true) << 8; // get the high byte
distance |= i2cReceive(false); // get the low byte
i2cStop();
return distance;
}
uint8_t srf08GetVersion()
{
i2cStart();
i2cTransmit(currentAddress);
i2cTransmit(0x00); // select software version register
i2cStart(); // restart to indicate read operation
i2cTransmit(currentAddress + 1); // select current device's read address
uint8_t version = i2cReceive(false); // get the value at version register
i2cStop();
return version;
}
uint8_t srf08GetLight()
{
i2cStart();
i2cTransmit(currentAddress);
i2cTransmit(0x01); // select light register
i2cStart();
i2cTransmit(currentAddress + 1);
uint8_t light = i2cReceive(false);
i2cStop();
return light;
}
static portTASK_FUNCTION(readTemp, args) {
while (1) {
i2cAcquire(DS3232_I2C_ADDRESS);
i2cSend(0x11);
unsigned char tempMSB = i2cReceive(I2C_ACK);
unsigned char tempLSB = i2cReceive(I2C_NACK) >> 6;
i2cRelease();
printf("Temp %d.%d C\n", tempMSB, 25 * tempLSB);
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
}
uint8 i2cRegisterRead(uint8 sadd, uint8 regadd)
{
int d = 0;
uint8 buff;
buff = (regadd-1)*2;
i2cSetSlaveAdd(i2cREG1, sadd);
i2cSetCount(i2cREG1, 1);
i2cSetMode(i2cREG1, I2C_MASTER | I2C_TRANSMITTER | I2C_START_COND);
i2cSend(i2cREG1, 1,&buff);
while((i2cREG1->STR & (uint32)I2C_ARDY) == 0U)
{}
i2cSetMode(i2cREG1, I2C_MASTER | I2C_RECEIVER | I2C_START_COND | I2C_STOP_COND);
i2cREG1->MDR = i2cREG1->MDR & (uint32)0xFFFFFDFF;
i2cSetCount(i2cREG1, 1);
i2cReceive(i2cREG1, 1, &buff);
while(d < 50)
{
d++;
}
return buff;
}
