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Common Questions & Answers
A common C programming error is to do something like:
i16 = i8 * 100;
When the intent was:
i16 = (long) i8 * 100;
Remember that with unsigned ints (the default for this compiler) the values are never
negative. For example 2-4 is 254 (in 8 bit). This means the following is an endless loop since i
is never less than 0:
int i;
for( i=100; i>=0; i--)
How can a constant data table be placed in ROM?
The compiler has support for placing any data structure into the device ROM as a constant
read-only element. Since the ROM and RAM data paths are separate in the PIC? , there are
restrictions on how the data is accessed. For example, to place a 10 element BYTE array in
ROM use:
BYTE CONST TABLE [10]= {9,8,7,6,5,4,3,2,1,0};
and to access the table use:
x = TABLE [i];
OR
x = TABLE [5];
BUT NOT
ptr = &TABLE [i];
In this case, a pointer to the table cannot be constructed.
Similar constructs using CONST may be used with any data type including structures, longs and
floats.
Note that in the implementation of the above table, a function call is made when a table is
accessed with a subscript that cannot be evaluated at compile time.
How can I use two or more RS-232 ports on one PIC??
The #USE RS232 (and I2C for that matter) is in effect for GETC, PUTC, PRINTF and KBHIT
functions encountered until another #USE RS232 is found.
The #USE RS232 is not an executable line. It works much like a #DEFINE.
The following is an example program to read from one RS-232 port (A) and echo the data to
both the first RS-232 port (A) and a second RS-232 port (B).
327
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相关PDF资料
PCI-EXP-T42G5-N1
IP CORE PCI EXPRESS ORCA 4
PCM18XH2
PROCESSOR MODULE MPLAB-ICE 2000
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PDA-B-24-615-E-2B1-1-C
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