expression.c File Reference

Expression pedal implementation. More...

#include <stdbool.h>
#include <string.h>
#include <avr/eeprom.h>
#include "lib/adc.h"
#include "lib/leds.h"
#include "lib/math.h"
#include "lib/midi.h"
#include "lib/usb.h"
#include "config.h"
#include "expression.h"

Include dependency graph for expression.c:

Functions
static void	send_enable_message (bool enable)
	Send a MIDI note on/off message. More...
bool	exec_cal (const char *command)
	Handler for the serial command 'cal'. More...
bool	exec_echo (const char *command)
	Handler for the serial command 'echo'. More...
bool	exec_mute (const char *command)
	Handler for the serial command 'mute'. More...
void	handle_enable_switch (void)
	A background task that handles the enable switch. More...
void	init_expression_module (void)
	Initializes the expression module. More...
void	trigger_expression_conversion (void)
	Triggers an ADC conversion of the expression pedal input. More...
void	update_expression_value (uint16_t adc_value)
	Updates the stored expression value. More...

Variables
static uint8_t	current_expression_value = 0
	The latest known expression value. More...
static bool	echo = false
	Status variable for expression value console echo. More...
static bool	switch_state = false
uint16_t	adc_offset = 0
uint16_t adc_offset_eemem	EEMEM
static uint8_t	mute_enabled

Detailed Description

Expression pedal implementation.

Function Documentation

exec_cal()

bool exec_cal

(

const char *

command

)

Handler for the serial command 'cal'.

exec_echo()

bool exec_echo

(

const char *

command

)

Handler for the serial command 'echo'.

exec_mute()

bool exec_mute

(

const char *

command

)

Handler for the serial command 'mute'.

handle_enable_switch()

void handle_enable_switch

(

void

)

A background task that handles the enable switch.

This task polls the enable switch input. If the input changed, a MIDI note on / off message is transmitted.

See also

MIDI_NOTE_ENABLE_WAH

init_expression_module()

void init_expression_module

(

void

)

Initializes the expression module.

Reads calibration values from EEPROM.

send_enable_message()

static void send_enable_message ( bool  enable )

static

Send a MIDI note on/off message.

Parameters

enable

true sends "note on"; false sends "note off"

trigger_expression_conversion()

void trigger_expression_conversion

(

void

)

Triggers an ADC conversion of the expression pedal input.

update_expression_value()

void update_expression_value

(

uint16_t

new_value

)

Updates the stored expression value.

If the value changed, the new value is sent as a MIDI control change message for controller #69 (Waldorf Blofeld's F1 Cutoff).

Variable Documentation

adc_offset

uint16_t adc_offset = 0

current_expression_value

uint8_t current_expression_value = 0

static

The latest known expression value.

echo

bool echo = false

static

Status variable for expression value console echo.

EEMEM

uint8_t mute_enabled_eemem EEMEM

mute_enabled

uint8_t mute_enabled

static

switch_state

bool switch_state = false

static