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Embedded Software Assignment 1
Dependencies: MCP23017 WattBob_TextLCD mbed
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ES_Assignment_1_Pub
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Diff: main.cpp
- Revision:
- 0:d16c044806a6
- Child:
- 1:abf92edc970f
diff -r 000000000000 -r d16c044806a6 main.cpp
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+++ b/main.cpp Mon Feb 22 17:29:30 2016 +0000
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+
+/***********************************************************************************************************************************************
+* *
+* Waveform Generator ( Embedded Software Assignment 1 ) *
+* @author *
+* @version 1.0 *
+* @lastupdate 27.01.2016 *
+* *
+* This program generates a waveform, and a synchronise pulse for an trigger, similar to the following example: *
+* *
+* in one period or block, the end of a block constis of a default wait(b), *
+* the signal a and wait b is exectued 20 times and an additional waiting time (d) *
+* _______ _________ _________ ________ _______ *
+* | | | | | | | | | | | | *
+* SIGNAL A | <---> | <---> | <-----> | <---> | <-----> | <---> | <--> | <---> | <---> | | <---> | *
+* (wave) | a | b | a+i*50 | b | a+i*50 | b... | a... | b | d | | a | ..... *
+* _______| |_______| |_______| |_______| |_______|_____________________|_____| |__________ *
+* | --> repeated in sum 20 times | *
+* | |_____________________________|________________________ *
+* | end pause | begin of the next block *
+* _____| |_____ *
+* SIGNAL B | | <---------------------------------------------> | | | *
+* (trigger) | <-> | c | | <-> | *
+* _| z |____________________________________________________________|_____________________________| z |__________________ *
+* *
+* *
+* *
+* *
+***********************************************************************************************************************************************/
+
+
+/*
+========================================================================================
+= =
+= INCLUDES and DIGITAL PORT DECLARATION =
+= =
+========================================================================================
+*/
+
+#include "mbed.h" // Include the default mbed header file
+
+DigitalOut sig_a(p18); // Digital Output for the Wave Signal
+DigitalOut sig_b(p17); // Digital Output for the Trigger pulse
+DigitalIn sw_onoff(p21); // Digital Input for the ON / OFF Switch
+DigitalIn sw_inv(p22); // Digital Input for the Inverted Switch
+
+/*
+========================================================================================
+= =
+= MAIN PROCEDURE - generating the Blocks =
+= =
+========================================================================================
+*/
+
+int main()
+{
+ int var_z = 10; // Signal B - Trigger Pulse in us
+ int var_c = 7 + 13; // Letter M / number of pulses in one block
+ int var_d = 500 * 16; // Letter P / number of space between the blocks
+ int multiplier = 50; // is added to each pulse lenth after every pulse
+
+ while(1) { // repeat the signal procedure forever
+
+ if(sw_onoff) { // if the ON/OFF Switch is ON, proceede, else do nothing
+
+ sig_b = 1; // Send the Trigger pulse (set port B high)
+ wait_us(var_z); // wait for var_z us
+ sig_b = 0; // Stop the Signal B (set port B low)
+
+ int var_a = 100 * 12; // Letter L / the pulse length in us;
+ int var_b = 100 * 1; // Letter A / wait us between the pulses
+
+
+ if(sw_inv) { // if the Inverted Switch is ON, proceede, else jump over this
+ // this inverts the values of var_a and var_b
+ int temp = var_a; // save var_a to a temporary variable
+ var_a = var_b; // replace var_a with var_b
+ var_b = temp; // replace var_b with temp (value of var_a)
+ }
+
+ // This for loop generates the BLOCKS
+ for (int i=0; i<var_c; i++) { // run this loop var_c times
+ sig_a = 1; // Start the Signal A (set port A to high)
+ wait_us(var_a + i * multiplier); // wait for var_a + i * multiplier us
+ sig_a = 0; // Stop the Signal A (set port A to low)
+ wait_us(var_b); // wait for var_b us (wait between the pulses)
+ }
+
+ wait_us(var_d); // wait vor var_d us (final wait)
+ }
+ }
+}
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