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H th ng nhúngệ ố
Th c sĩ Lê M nh H iạ ạ ả
Embedded Systems
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Lesson 5 : Taking a look under the
hood
Motivation:
•Memory space allocation
• Program space visibility
• Investigating memory allocation
• Looking at the MAP
• Pointers
• The heap
• MPLAB® C30 memory models
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Flight plan
•In this lesson we will review the basics of
string declaration as an excuse to introduce
the memory allocation techniques used by
the MPLAB C30 compiler.
• The RISC architecture of the PIC24 poses
some interesting challenges and offers
innovative solutions.
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Preflight checklist
•This lesson will be performed exclusively
with software tools including the MPLAB
IDE, MPLAB C30 compiler and the
MPLAB SIM simulator.
•Use the “New Project Set-up” checklist to
create a new project called “Strings” and a
new source file similarly called “strings.c”.
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The flight
1. char s[5] = { 'H', 'E', 'L', 'L', 'O'};
2. char s[5] = "HELLO";
3. char s[] = "HELLO";
4. char s[6] = { 'H', 'E', 'L', 'L', 'O', '\0' };