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direction that they assume whenever the processor is powered on) In addition, many pins can implement more than one function (but not at the same time) With this in mind, consider the PICAXE-08M2 pin-out presented earlier in Figure 4-1 The C1, C2, and C4 pins are bidirectional, as indicated by the In/Out in their descriptions The C0 pin is fixed as an output, and the C3 and C5 pins are fixed as inputs In addition, most of the I/O pins are multifunctional, as shown in their descriptions The function that s listed closest to its corresponding pin indicates both the default direction and the default function for that pin For example, on power-up, C0 is configured as the Serial Out pin, C5 is configured as the Serial In pin, and the remaining four I/O pins are configured as general-purpose inputs There are two ways your program can change the default direction of a bidirectional pin The simpler approach is to just use a command that indicates the direction you want to use For example, if you connect an LED and currentlimiting resistor from the 08M2 s C1 pin to Ground and execute a high C1 command in your program, that pin immediately becomes an output and the LED is lit The second method of changing the default direction of a bidirectional pin is by using the appropriate special-function variable: dirsB or dirsC This approach is more powerful than the first one because it enables us to change the directionality of multiple pins with just one command Since all the 08M2 s I/0 pins are portC pins, only dirsC, pinsC, and outpinsC are implemented on the 08M2, but the following discussion also applies to dirsB, pinsB, and outpinsB on the larger M2 processors DirsC is an eight-bit variable, but the only bits of dirsC that are enabled are the ones that correspond to the processor s I/O pins that are bidirectional Therefore, for the 08M2, dirsC consists of the following eight bits: x : x : x : dir4 : x : dir2 : dir1 : x Placing a 1 in the appropriate bit position configures the.

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corresponding I/O pin as an output; a 0 makes it an input If you place either a 1 or a 0 in any of the bits designated by x, nothing happens because that bit is not implemented on the 08M2 In PICAXE BASIC, the % symbol is used to indicate a binary number Therefore, on the 08M2, the statement dirsC %00001111 would configure I/O pin 4 as an input and I/O pins 2 and 1 as outputs (C0 is fixed as an output anyway) Since only the bidirectional pins are affected, the statement dirsC %11100110 would have the same effect

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The updatec program establishes a connection to the test database on the PostgreSQL server running on the local system, using the earl Login Role After the connection is established, a simple INSERT SQL command is executed on the server using the PQexec() function The status of the command is checked using the PQresultStatus() function and the PGRES_COMMAND_OK value If the status is not OK, the PQerrorMessage() function is used to display the error message generated by the server Finally, the

The pinsB and pinsC special-function variables provide access to the real-time values of each of the processor s input pins Similarly to dirsB and dirsC, the pinsB and pinsC variables are composed of eight individual bit variables, which correspond to the eight (possible) pins on an I/O port However, the only bits of pinsB and pinsC that are actually implemented are the ones that correspond to a valid input pin on the processor you are using For example, if you look at the pin-out of the PICAXE-14M2 presented earlier in Figure 4-2, you can see that there are only six pins in each of its two I/O ports Let s assume that your 14M2 program has just executed a dirsB %00110011 statement At this point, B3 and B2 are configured as input pins, and B5, B4, B1, and B0 are output pins (B0 is fixed as an output anyway, so it really doesn t matter whether you put a 0 or a 1 in the bit0 position of dirsB, but I think it s a good idea to always match the bit and the direction of every pin) With this configuration of the portB pins, pinsB now consists of the following eight bits: x : x : x : x : pinB3 : pinB2 : x : x, so pinB3 and pinB2 are the only valid input pin variables You can use these variables as you would any variable (eg, if pinB3 = 1 then ), and you can even include a symbol statement in your variables declarations to make it easier to remember what s

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