Chapter 14 files

ADCT0ATrigger/ADCT0ATrigger.h

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+// ADCT0ATrigger.h
+// Runs on LM4F120
+// Provide a function that initializes Timer0A to trigger ADC
+// SS3 conversions and request an interrupt when the conversion
+// is complete.
+// Daniel Valvano
+// October 25, 2012
+
+/* This example accompanies the book
+   "Embedded Systems: Real Time Interfacing to Arm Cortex M Microcontrollers",
+   ISBN: 978-1463590154, Jonathan Valvano, copyright (c) 2012
+
+ Copyright 2012 by Jonathan W. Valvano, valvano@mail.utexas.edu
+    You may use, edit, run or distribute this file
+    as long as the above copyright notice remains
+ THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
+ OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
+ VALVANO SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL,
+ OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
+ For more information about my classes, my research, and my books, see
+ http://users.ece.utexas.edu/~valvano/
+ */
+
+// This initialization function sets up the ADC according to the
+// following parameters.  Any parameters not explicitly listed
+// below are not modified:
+// Timer0A: enabled
+// Mode: 16-bit, down counting
+// One-shot or periodic: periodic
+// Prescale value: programmable using variable 'prescale' [0:255]
+// Interval value: programmable using variable 'period' [0:65535]
+// Sample time is busPeriod*(prescale+1)*(period+1)
+// Max sample rate: <=125,000 samples/second
+// Sequencer 0 priority: 1st (highest)
+// Sequencer 1 priority: 2nd
+// Sequencer 2 priority: 3rd
+// Sequencer 3 priority: 4th (lowest)
+// SS3 triggering event: Timer0A
+// SS3 1st sample source: programmable using variable 'channelNum' [0:11]
+// SS3 interrupts: enabled and promoted to controller
+// channelNum must be 0-11 (inclusive) corresponding to Ain0 through Ain11
+void ADC0_InitTimer0ATriggerSeq3(unsigned char channelNum, unsigned char prescale, unsigned short period);