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One aspect of the RTOS messaging to Task1 that I am pleased with is the ability of the RTOS MsgWait to return the task number of the transmitting tasks. I found this to be very useful in this application because it allowed me to respond immediately to incoming messages. If I hadn t put in this feature, I would have had to poll through each available task to nd what was sending messages to it. Doing this polling could be a problem with TimerTask because I would like to respond to that task rst so that I always will respond before the next timer tick. To also make sure that TimerTask never misses an interrupt, I acknowledge the message before processing it and updating the time. Before sending a message to the LCD task to notify it that it s time to update the display, the ButtonTask is polled to see if it is sending a message to TimeTask. If an increment command is sent to TimeTask, the Seconds information is deleted and the Minutes is updated with the latest Increment value. The Increment value is kept at one while the time set button is released and increments by powers of 2 (to a maximum of 63) for each second the button is pressed. Each second that the button is pressed, a message is sent to TimeTask indicating that it should increment the Minutes count by the Increment value. The time increment value is increased by the next power of 2 (to a maximum value of 63) or reset back to 1. By pressing the button, the Increment value is increased by a power of 2. Thus, after 1 second, it will increase the minute counter variable by 3 minutes (and not 1); after 2 seconds, it will increase the minute counter variable by 7 minutes; and after 3 seconds, by 15 minutes. When an Increment variable value of 63 is reached, Increment won t be incremented any more, and every second, the hour will be updated. Using this algorithm, it s possible to run through a total of 24 hours in less than 30 seconds with quite a bit of control over the time you are trying to arrive at. If you are a digital clock manufacturer, I hope that you remember where you rst saw this. I would be happy to license this algorithm to you for a modest fee. The temperature sensor used in this application, the Dallas Semiconductor DS1820, is a rather interesting little beast. It is available in a three-pin transistor (TO-92) like package and only requires a 10-k pull-up resistor for the driving signal. The data sent and received use a Manchester-like encoded signal in which the controlling device pulls down the line for a speci c amount of time to write to the DS1820. A 0 is a low pulse of 15 to 60 s (with 30 s being typical), and a 1 is a low pulse greater than 1 and less than 15 s. The write operation is shown in Fig. 13.6. To read data from the DS1820, the microcontroller pulls down the line for approximately 1 s and releases it, at which time the DS1820 holds the line low for a speci c length of time to write a bit on the line. If the DS1820 holds the line low for less than 15 s, then a 1 is being sent. If the line is low for greater than 15 s, then a 0 is being transmitted. I found it best to poll the line 3 or 4 s after the PIC18 stops driving the line. Figure 13.7 shows a read of two 1s followed by two 0s to give you an idea of what data looks like on the single line. Data is passed between the controlling device and the DS1820 8 bits at a time, with the least signi cant bit rst. Before any command, a reset pulse of approximately 500 s is output onto the line. When the line goes high, the DS1820 responds by
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