#include <inttypes.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include <math.h>
#include "imu.h"
#include <util/delay.h>
#include "midi.h"
#include "uart.h"
Go to the source code of this file.
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| void | task1 (void) |
| | This function is the function that gets called every 25ms that handles the main logic, it reads the sensor values, checks flags set by the ADC interrupt vector, and sends the according MIDI signals. More...
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| void | initialize (void) |
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| void | get_pitch_roll (float *pitch, float *roll) |
| | This function reads the accelerometer and calculates the pitch and roll of the device. More...
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| void | play_note_off (void) |
| | Turns the note we had stored in the note global varible off. More...
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| void | play_note_on (uint8_t n) |
| | Sends the MIDI note on signal on the serial line with the note specified in the parameter at velocity 100. stores the note in a global variable so we can turn it off at a later time. More...
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| |
| | ISR (TIMER0_COMPA_vect) |
| | This ISR keeps a millisecond timer for timing the main task. More...
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| |
| int | main (void) |
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| | ISR (ADC_vect) |
| | Rather than waiting in while loop for the ADC readings, we use the ADC interupt that sets the values asynchronously. This function checks to see if the values of the flex resistors have indicted whether a finger has been bent or not. If the value of Chanel 0 of the ADC is greater than 250 we set a flag to play a note, if it is less than 245, we set a flag to end the note. The other flex resitor, on the middle finger has a larger range so determining whether it is on or off is easier, we merely check to see if it is greater than 240, and set the appropiate flag. More...
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| char | handle_notes (float roll) |
| | Takes the current roll and determines if a note needs to be played or turned off. It calculates the note from the roll. We are playing notes only on a major scale. It can be transposed up or down. More...
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| FILE | uart_str = FDEV_SETUP_STREAM(uart_putchar, uart_getchar, _FDEV_SETUP_RW) |
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| char | play_on = 0 |
| | if 1 a note is played More...
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| char | play_off = 0 |
| | if 0 a note is turned off More...
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| volatile char | chan1 |
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| volatile char | adc_chan1_on |
| | whether or not the middle note is held down. More...
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| volatile unsigned int | time1 |
| | task1 counter More...
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| char | channel = 0 |
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| uint8_t | instrument = 0 |
| | counter to keep track of what instrument is on the MIDI channel More...
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| uint8_t | note = 60 |
| | Current note being played. More...
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| uint8_t | base_note = 0 |
| | base_note for transposing the C-major scale More...
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| uint16_t | time = 0 |
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| uint16_t | wait = WAIT_VALUE |
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| float | old_roll |
| | used to keep track of the roll so we can bend the pitch relative to the note it was played at. More...
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| char | cmajor [15] = {48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69, 71, 72} |
| | C-major scale in MIDI notes can add or subtract a value to transpose to different keys. More...
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| #define WAIT_VALUE (300 / t1) |
| void get_pitch_roll |
( |
float * |
pitch, |
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float * |
roll |
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) |
| |
This function reads the accelerometer and calculates the pitch and roll of the device.
- Parameters
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| pitch | pointer to a float that will contain the current pitch measured by the accelerometer. |
| roll | pointer to a float that will contain the current roll measured by the accelerometer. |
Definition at line 120 of file project.c.
| char handle_notes |
( |
float |
roll | ) |
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Takes the current roll and determines if a note needs to be played or turned off. It calculates the note from the roll. We are playing notes only on a major scale. It can be transposed up or down.
- Parameters
-
- Returns
- 1 if a new note was played, 0 otherwise
Definition at line 211 of file project.c.
| ISR |
( |
TIMER0_COMPA_vect |
| ) |
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This ISR keeps a millisecond timer for timing the main task.
Definition at line 50 of file project.c.
Rather than waiting in while loop for the ADC readings, we use the ADC interupt that sets the values asynchronously. This function checks to see if the values of the flex resistors have indicted whether a finger has been bent or not. If the value of Chanel 0 of the ADC is greater than 250 we set a flag to play a note, if it is less than 245, we set a flag to end the note. The other flex resitor, on the middle finger has a larger range so determining whether it is on or off is easier, we merely check to see if it is greater than 240, and set the appropiate flag.
Definition at line 81 of file project.c.
Entry point and task scheduler loop
Definition at line 62 of file project.c.
| void play_note_off |
( |
void |
| ) |
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Turns the note we had stored in the note global varible off.
Definition at line 253 of file project.c.
| void play_note_on |
( |
uint8_t |
n | ) |
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Sends the MIDI note on signal on the serial line with the note specified in the parameter at velocity 100. stores the note in a global variable so we can turn it off at a later time.
- Parameters
-
Definition at line 243 of file project.c.
This function is the function that gets called every 25ms that handles the main logic, it reads the sensor values, checks flags set by the ADC interrupt vector, and sends the according MIDI signals.
Definition at line 159 of file project.c.
| volatile char adc_chan1_on |
whether or not the middle note is held down.
Definition at line 38 of file project.c.
base_note for transposing the C-major scale
Definition at line 142 of file project.c.
| char cmajor[15] = {48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69, 71, 72} |
C-major scale in MIDI notes can add or subtract a value to transpose to different keys.
Definition at line 203 of file project.c.
counter to keep track of what instrument is on the MIDI channel
Definition at line 134 of file project.c.
Current note being played.
Definition at line 138 of file project.c.
used to keep track of the roll so we can bend the pitch relative to the note it was played at.
Definition at line 153 of file project.c.
if 0 a note is turned off
Definition at line 28 of file project.c.
if 1 a note is played
Definition at line 24 of file project.c.
| volatile unsigned int time1 |
1.8.7