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<title>TExaS</title>
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<p style="text-align: center;" align="center"><span
style="font-size: 18pt;">TExaS</span><br>
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<p><b><span style="font-size: 18pt;">Readme</b></span>
<br> <br>
This is a C language project that demonstrates the TExaS
oscilloscope and the TExaS logic analyzer.
Typically, you add <b>TExaS.c</b> to your project creating
the scope or logic analyzer along side your application.
This project simply demonstrates how to configure TExaS.
Data are
sent to the PC at 10 kHz using a low priority periodic interrupt and plotted using the
Windows application <b>TExaSdisplay</b>.
Using either the scope or logic analyzer will consume
from 1 to 2% of the CPU time.
The system uses <b>UART0</b> and <b>TIMG10</b>.
The system can operate at either 32 or 48 MHz.
You specify your bus frequency at initialization.
In the <b>TExaS.h</b> file you
set <b>TEXAS_SCOPE=1</b> to create an 8-bit analog oscilloscope or
set <b>TEXAS_SCOPE=0</b> to create a 7-bit digital logic analyzer.</p>
<p>The scope uses either
<b>ADC0</b> or <b>ADC1</b> depending on how you initialize.
Any of the 16 analog pins on the MSPM0G3507 can be configured
as the analog source. The ADC is set to continuously sample, but
data are sent to the PC through UART0 only at 10 kHz. For example<br><br>
<b><code>TExaS_Init(ADC0,TEXAS_48MHz,5); </code></b><br><br>
will configure TExaS as a scope using ADC0 channel 5 (PB24), which
is the microphone on the MKII booster. The following figure shows
the scope trace displaying voltage versus time from the microphone.</p>
<p class="PictureWide"><span lang="en-US"><img src="TExaSscope.png"
></span></p>
<p>The following figure shows
the spectrum analyzer trace displaying amplitude versus frequency from the microphone.</p>
<p class="PictureWide"><span lang="en-US"><img src="TExaSspectrumAnalyzer.png"
></span></p>
<p>
The logic analyzer allows any 7 digital pins to be measured.
Some options are predefined in <b>TExaS.h</b>.
However, you can define other pin configuration by
by defining your own <b>TEXAS_LOGIC</b> macro. This macro
creates a 7-bit data value, adding bit 7 high.
This value is sent to the PC through UART0 at 10 kHz.
For example, the following configures logic analyzer for PB21,PA18,PB27,PB26,PB22,PA0.<br><br>
<b><code>
#define PAoutPin0Bit0 (GPIOA->DOUT31_0&1)<br>
#define PBoutPin22Bit1 (((GPIOB->DOUT31_0&(1<<22))>>21))<br>
#define PBoutPin26Bit2 (((GPIOB->DOUT31_0&(1<<26))>>24))<br>
#define PBoutPin27Bit3 (((GPIOB->DOUT31_0&(1<<27))>>24))<br>
#define PAinPin18Bit4 (((GPIOA->DIN31_0&(1<<18))>>14))<br>
#define PBinPin21Bit5 (((GPIOB->DIN31_0&(1<<21))>>16))<br>
#define TEXAS_LOGIC (0x80|PBinPin21Bit5|PAinPin18Bit4|PBoutPin27Bit3|PBoutPin26Bit2|PBoutPin22Bit1|PAoutPin0Bit0)
</code></b><br><br>
This 6-bit logic analyzer consumes about 2% of the CPU time.
The following figure shows
the logic analyzer trace displaying PB21,PA18,PB27,PB26,PB22,PA0 digital pins versus time.</p>
<p class="PictureWide"><span lang="en-US"><img src="TExaSlogicAnalyzer.png"
></span></p>
<p>
<br>
Derived from Texas Instrument code
<ul>
<li>adc12_single_conversion_vref_internal_LP_MSPM0G3507_nortos_ticlang</li>
<li>adc12_single_conversion_LP_MSPM0G3507_nortos_ticlang</li>
</ul>
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<p><b><span style="font-size: 18pt;">Hardware Required</b></span>
<br>
<ul>
<li>MSPM0G3507 LaunchPad™ Development Kit (LP-MSPM0G3507)</li>
<li>Educational BoosterPack MKII (BOOSTXL-EDUMKII)</li>
</ul>
<b><span style="font-size: 18pt;">Pin assignments</b></span>
<br>
<ul>
<li>Digital Input: PA26 is MKII joystick Select button </li>
<li>Analog Input: PA25 is MKII joystick horizontal (X) PA25_ADC0.2</li>
<li>Analog Input: PA18 is MKII joystick vertical (Y) PA18_ADC1.3</li>
<li>Analog Input: MKII is accelerometer X PB19__ADC1.6</li>
<li>Analog Input: MKII is accelerometer Y PA22__ADC0.7</li>
<li>Analog Input: MKII is accelerometer Z PB18__ADC1.5</li>
<li>Output: PA0 is red LED1, index 0 in IOMUX PINCM table</li>
<li>Output: PB22 is blue LED2, index 49 in IOMUX PINCM table</li>
<li>Output: PB26 is red LED2, index 56 in IOMUX PINCM table</li>
<li>Output: PB27 is green LED2, index 57 in IOMUX PINCM table</li>
<li>Input: PA18 is S2 positive logic switch, index 39 in IOMUX PINCM table</li>
<li>Input: PB21 is S3 negative logic switch, index 48 in IOMUX PINCM table</li>
</ul>
<b><span style="font-size: 18pt;">LaunchPad Jumpers</b></span>
<br>
<ul>
<li>Remove J16 J17 J18: Disconnects light sensor from the microcontroller PA22 PA27 PA26</li>
<li>J4: Connects PA0 to red LED</li>
<li>J5: Connects PB22 to blue LED2</li>
<li>J6: Connects PB26 to red LED2</li>
<li>J7: Connects PB27 to green LED2</li>
</ul>
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<p>
Simplified BSD License (FreeBSD License)
Copyright © 2023, Jonathan Valvano, All rights reserved.<br>
<br>
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:<br>
<ol>
<li>Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.</li>
<li>Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.</li></ol>
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.<br>
<br>
The views and conclusions contained in the software and documentation are
those of the authors and should not be interpreted as representing official
policies, either expressed or implied, of the FreeBSD Project.
<br>
</p>
<p>For more information, see <a href="http://users.ece.utexas.edu/~valvano/">
http://users.ece.utexas.edu/~valvano/</a>.
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