Tulsanus Hurricanus Digitalus Mus Controller • EDU Processor 10 MIPS • Variable space: 2K SRAM • Program space: 32K FLASH • Serial port • Interrupts • Timers • Direct control of the hardware

C Concepts " Modular " Powerful " Industry standard " Fast and efficient

Programming in dialect of C • No native floating point math. • No built in trig functions. • optional Assembly • Macros • GetData() • PutData() • Get_Analog_Value() function • Digital I/O (user chooses) • Sixteen 10-bit analog inputs

One project, many files… •.c-Source Files •.h-Header Files •.lib-Library Files •.lkr-Linker Scripts • Edit the.c and.h files • Compile • Link

Variables unsigned char wheel_count; /* range: 0 to 255 */ char wheel_count; /* range: -128 to 127 */ unsigned int wheel_count; /* range: 0 to */ int wheel_count; /* range: to */

unsigned int Doubled_Number (unsigned int num2double) { unsigned int result; result = 2 * num2double; return result; } Sample Function LOCAL VARIABLES CODE TO EXECUTE RETURN VALUE Sample Function

Pre-Processor Directive The # symbol denotes a pre-processor directive that is evaluated before the compiler takes over. #include “ ifi_aliases.h ” MUST be in left-most column!

#define preprocessor directive #define identifier replacement-text occurrences of identifier is replaced by replacement- text before compilation " Symbolic constants – #define PI all subsequent occurrences of symbol constant PI are replaced with – #define FIELD_WIDTH 125 – #define FIELD_LENGTH 300

#define preprocessor directive #define macro-identifier replacement-text occurrences of macro-identifier is replaced by replacement-text before compilation " Macros – #define CIRCLE_AREA(x) (PI*(x)*(x)) when CIRCLE_AREA(x) appears: " The value of x is substituted for x " Then the macro is expanded #define macro-identifier replacement-text occurrences of macro-identifier is replaced by replacement-text before compilation " Macros – #define CIRCLE_AREA(x) (PI*(x)*(x)) when CIRCLE_AREA(x) appears: " The value of x is substituted for x " Then the macro is expanded

#define preprocessor directive #define CIRCLE_AREA(x) (PI*(x)*(x)) area= CIRCLE_AREA(7) ; // becomes: area= ( * (7) *(7)); area = CIRCLE_AREA(rd +2); //becomes: area = ( * (rd+2)*(rd+2)); #define FIELD_PERIMETER FIELD_WIDTH*2+FIELD_LENGTH*2 #define CIRCLE_AREA(x) (PI*(x)*(x)) area= CIRCLE_AREA(7) ; // becomes: area= ( * (7) *(7)); area = CIRCLE_AREA(rd +2); //becomes: area = ( * (rd+2)*(rd+2)); #define FIELD_PERIMETER FIELD_WIDTH*2+FIELD_LENGTH*2

Output in C " printf("pwM01 = ",pwd, \n)