FAQs
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9.
When I try to compile the source code with Code Composer Essentials with a version prior to
3.1 (build 3.2.3.6.4), I get the following error:
undefined first referenced symbol in file --------- ---------------- __delay_cycles ./Peer
Applications/SEH_ED_v1.3.obj
The __delay_cycles intrinsic was introduced with Code Composer Essentials v3.1, and prior to this
release, the CCE code generation tools cannot process the statement. You can either upgrade to CCE
v3.1+ or remove the __delay_cycles intrinsic and replace with the following for-loop:
int i; for (i = 0; i < 250; ++i) { }
10. Why is the solar panel on the energy harvesting board so large when my TI-36X works fine
with a tiny solar panel?
The current required to run a calculator and LCD is relatively small. Running a wireless sensor
network, however, consumes approximately 10 mA to 25 mA when trying to simultaneously sample
sensors and transmit data wirelessly. This current might be 100 to 1,000 times more than a calculator
application. A larger solar panel allows collection of more solar energy to keep up with the real-time
demands of a wireless system with a high duty cycle. The design could be optimized with a smaller
solar cell, but the frequency of RF transmissions would have to be reduced significantly.
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Frequently Asked Questions
SLAU273C – January 2009 – Revised May 2010
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