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→Developing Firmware for the 87C51
= Firmware =
== Developing Firmware for the 87C51 ==
There are a number of tools that can be used to develop firmware for the 87C51 processor. The best 8051-specific software can be pretty expensive, but it is possible to get by with free software:
'''Compiler:''' The [http://sdcc.sourceforge.net/ SDCC] (Small Device C Compiler) is a compiler that is made for devices with limited amounts of memory. It can be used to compile code specifically for a number of targets, including the 8051 line of processors. A few of the useful flags are:
* <code>-mmcs51</code>: Compile code specifically for an MCS51 target
* <code>--iram-size [size]</code>: Specify that the device has <code>[size]</code> bytes of internal RAM
* <code>--xram-size [size]</code>: Same as above, but for external RAM
* <code>--code-size [size]</code>: Same as above, but for code memory (EPROM)
* <code>--out-fmt-ihx</code>: Produce an Intel HEX file as the output of the linking stage
* <code>--stack-auto</code>: Put all automatic variables on the stack, rather than storing a specific location in RAM for them. This can be a huge RAM saver!
Note that SDCC has [http://sdcc.sourceforge.net/mediawiki/index.php/Standard_compliance not completely implemented] the ISO C99/C11 standards. One very noticeable change is that SDCC does not allow variables declarations to be intermingled with code. That is, the following will not compile:
<pre>
void func()
{
int x = 1; // OK
x += 2; // OK
int y = x; // syntax error: token -> 'int'
}
</pre>
== Default Firmware ==