wire library how to wait for slave to finish job arduino

Then set the LastDiscrepancy to 64 (40 hex) and both LastDeviceFlag and LastFamilyDiscrepancy to 0. To target a particular family, set the desired family code byte into the first byte of the ROM_NO register and fill the rest of the ROM_NO register with zeros. If there are multiple devices on the 1-Wire it is common practice to target a search to only the family of devices that are of interest. This family code allows the 1-Wire master to know what operations this device is capable of. Each 1-Wire device has a one byte family code embedded within the ROM number (see Figure 1). The 'TARGET SETUP' operation is a way to preset the search state to first find a particular family type. Table 3ĭescribes the paths that are taken on subsequent searches when a discrepancy occurs. The bit position for the last discrepancy is recorded for use in the next search. Another algorithm could be devised to use the '1' path first.

Note that this is arbitrary for this particular algorithm.

The search algorithm specifies that on the first pass, when there is a discrepancy (bit/complement = 0/0), the '0' path is taken. A discrepancy, the condition where there are both 0s and 1s in the bit position, is the key to finding devices in the subsequent searches.

If this situation arises then the search should be terminated and a new search could be done starting with a 1-Wire reset.

The condition where no devices are participating is an atypical situation that can arise if the device being discovered is removed from the 1. On examination of Table 1, it is obvious that if all of the participating devices have the same value in a bit position then there is only one choice for the branch path to be taken.

Wire library how to wait for slave to finish job arduino