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Again, to make it easier to understand the code you will need to know how the MAX7219 chip works first so let s look at the hardware before the code. The MAX7219 operates very similarly to the shift registers in that you have to enter data in a serial fashion, bit by bit. A total of 16 bits must be loaded into the device at a time. The chip is easy to use, and it uses just three pins from the Arduino. Digital Pin 2 goes to Pin 1 on the MAX, which is the Data In. Digital Pin 3 goes to Pin 12 on the MAX, which is LOAD and finally, Digital Pin 4 goes to Pin 13 on the MAX, which is the clock. See Figure 7-5 for the pinouts of the MAX7219.

Clearly validwhen is a powerful solution to a variety of problems. Consider the common problem of validating a twice-entered password (see Listing 15-7).

A forum at the Millstein Center for Corporate Governance and Performance at Yale University s School of Management included discussions on the role of Boards in general and the role of Boards with respect to the financial meltdown in particular We took a look at risk management, compensation practices, and shareholder protection We talked about many of the things discussed in this chapter Several people mentioned that we (CA s Board of Directors) have taken very aggressive action to achieve good governance One person commented, You ve gone a long way on addressing governance It might be hard for other organizations to go that far, but you had a near-death experience and that s why you went there That is true We did.

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<field property="password2" depends="validwhen"> <var> <var-name>test</var-name> <var-value> (password == *this*) </var-value> </var> </field>

Figure 7-5. Pin diagram for the MAX7219 The LOAD pin is pulled low and the first bit of the data is set as either HIGH or LOW at the DIN pin. The CLK pin is set to oscillate between LOW and HIGH. On the rising edge of the clock pulse, the bit at the DIN pin is shifted into the internal register. The clock pulse then falls to LOW and the next data bit is set at the DIN pin before the process repeats. After all 16 bits of data have been pushed into the register as the clock falls and rises 16 times, the LOAD pin is finally set to HIGH and this latches the data into the register. Figure 7-6 is the timing diagram from the MAX7219 datasheet and shows how the three pins are manipulated to send data bits D0 to D15 into the device. The DOUT pin, which is pin 24, is not used in this project. But, if you had more than one MAX7219 chip daisy chained together, the DOUT of the first chip is connected to the DIN of the second and so on. Data is clocked out of the DOUT pin on the falling edge of the clock cycle.

validwhen also makes validating dependent indexed fields and their properties unbelievably easy. For example, suppose your form had a table of values, such as a list of items in a shopping cart. You could do this by using one of the following:

Figure 7-6. Timing diagram for the MAX7219 You need to recreate this timing sequence in your code to be able to send the appropriate codes to the chip. The chip can source a current of up to 100mA, which is more than enough for most dot matrix displays. If you wish to read the datasheet for the MAX7219, you can download it from Maxim at http://datasheets.maxim-ic.com/en/ds/MAX7219-MAX7221.pdf The device accepts data in 16 bits. D15 or the msb (most significant bit) is sent first so the order goes from D15 down to D0. The first 4 bits are don t care bits, i.e. they are not used by the IC so they can be anything. The next 4 bits make up the register address and then the final 8 bits make up the data. Table 7-4 shows the serial data format and Table 7-5 shows the Register Address Map. Table 7-4. Serial Data Format (16 bits) of the MAX7219

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