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youyue858d.ino
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youyue858d.ino
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// TODO: merge rol_string´and display_string_running() into one single, nonblocking function
// TODO: avoid flickering while cooling down
// TODO: show the dot for temp_gain_correction (tgc) (2.40 instead of 240)
/*
* This is a custom firmware for my 'Youyue 858D+' hot-air soldering station.
* It may or may not be useful to you, always double check if you use it.
*
* V1.47
*
* 2017 - Florian Dollinger
* 2015/16 - Robert Spitzenpfeil
* 2015 - Moritz Augsburger
*
* License: GNU GPL v2
*
*
* Developed for / tested on by Robert Spitzenpfeil:
* -------------------------------------------------
*
* Date: 2015-02-01
* PCB version: 858D V6.0
* Date code: 20140415
*
* Developed for / tested on by Moritz Augsburger:
* -----------------------------------------------
*
* Date: 2015-02-01
* PCB version: 858D V6.0
* Date code: 20140415
*
* Reported to work with (I did not test these myself):
* ----------------------------------------------------
*
* PCB version: 858D V4.3
* Date code: 20130529
* HW mods: not tested!
*
* ---
*
* PCB version: 858D V4.10
* Date code: 20140112
* HW mods: not tested!
*
*/
/*
* Make sure to read and understand '/Docs/modes_of_operation.txt'
*
*
* If you compile and upload using the Arduino-IDE + ISP, choose one of these target boards:
*
* LilyPad Arduino w/ ATmega168 (TESTED - WORKS)
* LilyPad Arduino w/ ATmega328 (TESTED - WORKS)
*
* DO NOT USE A BOOTLOADER WITH THE WATCHDOG TIMER
*
* ISP CODE UPLOAD ONLY
*
* Change options in the .h file
*
*/
#define FW_MAJOR_V 1
#define FW_MINOR_V_A 4
#define FW_MINOR_V_B 7
/*
* PC5: FAN-speed (A5 in Arduino lingo) (OK)
* PC3: TIP122.base --> FAN (OK)
* PC2: fan-current-sense mod (OPTIONAL) - see Docs folder
* PC0: ADC <-- amplif. thermo couple voltage (A0 in Arduino lingo) (OK)
* #21: AREF <--- about 2.5V as analog reference for ADC
* PB1: opto-triac driver !! THIS IS DANGEROUS TO USE !! (OK)
*
* PB0: 7-seg digit 0 [common Anode] (OK)
* PB7: 7-seg digit 1 [common Anode] (OK)
* PB6: 7-seg digit 2 [common Anode] (OK)
*
* PD0: 7-seg top (OK)
* PD1: 7-seg bottom left (OK)
* PD2: 7-seg bottom (OK)
* PD3: 7-seg top left (OK)
* PD4: 7-seg dot (OK)
* PD5: 7-seg bottom right (OK)
* PD6: 7-seg middle (OK)
* PD7: 7-seg top right (OK)
*
* PB5: SW1 (button1) (OK)
* PB2: SW2 (button2) (OK)
* PB4: reed switch (wand cradle sensor) (OK)
*
*/
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <stdint.h>
#include <EEPROM.h>
#include "youyue858d.h"
// FRAMEBUFFERS
//-----------------------------------------------
// Contain the values to be displayed next
// fb is the "raw" data which is directly displayed by the timer-ISR
uint8_t fb[3] = { 0xFF, 0xFF, 0xFF }; // dig0, dig1, dig2
// framebuffer is a bit more structured needs and fb_update() to be stored in fb
framebuffer_t framebuffer = { 0x00, 0x00, 0x00, 0, 0, 0, 0 };
// PARAMETERS
//-----------------------------------------------
// min, max, default, value, eep_addr_high, eep_addr_low
CPARAM p_gain = { 0, 999, P_GAIN_DEFAULT, P_GAIN_DEFAULT, 2, 3 };
CPARAM i_gain = { 0, 999, I_GAIN_DEFAULT, I_GAIN_DEFAULT, 4, 5 };
CPARAM d_gain = { 0, 999, D_GAIN_DEFAULT, D_GAIN_DEFAULT, 6, 7 };
CPARAM i_thresh = { 0, 100, I_THRESH_DEFAULT, I_THRESH_DEFAULT, 8, 9 };
CPARAM temp_offset_corr = { -100, 100, TEMP_OFFSET_CORR_DEFAULT, TEMP_OFFSET_CORR_DEFAULT, 10, 11 };
CPARAM temp_gain_corr = { 100, 999, TEMP_GAIN_DEFAULT, TEMP_GAIN_DEFAULT, 30, 31 };
CPARAM temp_setpoint = { 50, 500, TEMP_SETPOINT_DEFAULT, TEMP_SETPOINT_DEFAULT, 12, 13 };
CPARAM temp_averages = { 100, 999, TEMP_AVERAGES_DEFAULT, TEMP_AVERAGES_DEFAULT, 14, 15 };
CPARAM slp_timeout = { 0, 30, SLP_TIMEOUT_DEFAULT, SLP_TIMEOUT_DEFAULT, 16, 17 };
CPARAM fan_only = { 0, 1, 0, 0, 26, 27 };
CPARAM display_adc_raw = { 0, 1, 0, 0, 28, 29 };
#ifdef CURRENT_SENSE_MOD
CPARAM fan_current_min = { 0, 999, FAN_CURRENT_MIN_DEFAULT, FAN_CURRENT_MIN_DEFAULT, 22, 23 };
CPARAM fan_current_max = { 0, 999, FAN_CURRENT_MAX_DEFAULT, FAN_CURRENT_MAX_DEFAULT, 24, 25 };
#else
//
// See youyue858d.h if you want to use the 'FAN-speed mod' (HW changes required)
// The following 2 CPARAM lines need changes in that case
//
CPARAM fan_speed_min = { 120, 180, FAN_SPEED_MIN_DEFAULT, FAN_SPEED_MIN_DEFAULT, 18, 19 };
CPARAM fan_speed_max = { 300, 400, FAN_SPEED_MAX_DEFAULT, FAN_SPEED_MAX_DEFAULT, 20, 21 };
#endif
// KEY STATE
//-----------------------------------------------
volatile uint8_t key_state; // debounced and inverted key state: bit = 1: key pressed
volatile uint8_t key_press; // key press detect
volatile uint8_t key_rpt; // key long press and repeat
volatile uint8_t display_blink;
//////////////////////////////////////////////////////////////////////////
// MAIN
//////////////////////////////////////////////////////////////////////////
int main(void)
{
init(); // make sure the Arduino-specific stuff is up and running (timers... see 'wiring.c')
setup_858D();
#ifdef DISPLAY_MCUSR
HEATER_OFF;
FAN_ON;
display_number(_mcusr);
MCUSR = 0;
//
// ATmega168 MCUSR (MSB to LSB): x-x-x-x-WDRF-BORF-EXTRF-PORF
//
delay(1000);
#endif
#ifdef USE_WATCHDOG
if (_mcusr & _BV(WDRF)) {
// there was a watchdog reset - should never ever happen
HEATER_OFF;
FAN_ON;
while (1) {
display_string("RST");
delay(1000);
clear_display();
delay(1000);
}
}
#endif
show_firmware_version();
#ifdef USE_WATCHDOG
test_F_CPU_with_watchdog();
#endif
fan_test();
#ifdef USE_WATCHDOG
watchdog_on();
#endif
#ifdef DEBUG
Serial.begin(2400);
Serial.println("\nRESET");
#endif
while (1) {
#ifdef DEBUG
int32_t start_time = micros();
#endif
static int16_t temp_inst = 0;
static int32_t temp_accu = 0;
static int16_t temp_average = 0;
static int16_t temp_average_previous = 0;
static int32_t button_input_time = 0;
static int16_t heater_ctr = 0;
static int16_t heater_duty_cycle = 0;
static int16_t error = 0;
static int32_t error_accu = 0;
static int16_t velocity = 0;
static float PID_drive = 0;
static uint8_t temp_setpoint_saved = 1;
static int32_t temp_setpoint_saved_time = 0;
static uint32_t heater_start_time = 0;
static uint32_t temp_low_fanonly_firstTime = 0;
static uint32_t temp_low_firstTime = 0;
static bool temp_low_fanonly_firstEvent = 1;
static bool temp_low_firstEvent = 1;
static bool fan_off_allowed = 0;
static bool was_hot_before = 0;
uint16_t adc_raw = analogRead(A0); // need raw value later, store it here and avoid 2nd ADC read
temp_inst = (adc_raw / (temp_gain_corr.value / 100)) + temp_offset_corr.value; // approx. temp in °C
if (temp_inst < 0) {
temp_inst = 0;
}
// pid loop / heater handling
if (fan_only.value == 1 || REEDSW_CLOSED) {
HEATER_OFF;
heater_start_time = millis();
clear_dot();
} else if (REEDSW_OPEN
&& (temp_setpoint.value >= temp_setpoint.value_min)
&& (temp_average < MAX_TEMP_ERR)
&& ((millis() - heater_start_time) < ((uint32_t) (slp_timeout.value) * 60 * 1000))) {
FAN_ON;
error = temp_setpoint.value - temp_average;
velocity = temp_average_previous - temp_average;
if (abs(error) < i_thresh.value) {
// if close enough to target temperature use PID control
error_accu += error;
} else {
// otherwise only use PD control (avoids issues with error_accu growing too large
error_accu = 0;
}
PID_drive =
error * (p_gain.value / P_GAIN_SCALING) + error_accu * (i_gain.value / I_GAIN_SCALING) +
velocity * (d_gain.value / D_GAIN_SCALING);
heater_duty_cycle = (int16_t) (PID_drive);
if (heater_duty_cycle > HEATER_DUTY_CYCLE_MAX) {
heater_duty_cycle = HEATER_DUTY_CYCLE_MAX;
}
if (heater_duty_cycle < 0) {
heater_duty_cycle = 0;
}
if (heater_ctr < heater_duty_cycle) {
set_dot();
HEATER_ON;
} else {
HEATER_OFF;
clear_dot();
}
heater_ctr++;
if (heater_ctr == PWM_CYCLES) {
heater_ctr = 0;
}
} else {
HEATER_OFF;
clear_dot();
}
static uint16_t temp_avg_ctr = 0;
temp_accu += temp_inst;
temp_avg_ctr++;
if (temp_avg_ctr == (uint16_t) (temp_averages.value)) {
temp_average_previous = temp_average;
temp_average = temp_accu / temp_averages.value;
temp_accu = 0;
temp_avg_ctr = 0;
}
/////////////////////////////////
// FAN CRADLE HANDLING
/////////////////////////////////
//
// TODO: On the second run the fan switches off immediately, why?
if(temp_average <= FAN_OFF_TEMP){
// Nur im ersten Druchlauf nach einer heißen Phase:
// Zeit merken zu der dieser Zustand zum ersten Mal erreicht wurde
if(was_hot_before && temp_low_firstEvent){
temp_low_firstTime = millis();
temp_low_firstEvent = 0;
}
// In weiteren Durchläufen:
// Vergangene Zeit berechnen seit erreichen dieses Events
// Sofern die Zeit >= FAN_OFF_TEMP_DELAY_MILLI
// Erlaubnis zum Abschalten des Lüfters geben
if(!temp_low_firstEvent){
if((millis() - temp_low_firstTime) >= FAN_OFF_TEMP_DELAY_MILLI)
fan_off_allowed = 1;
}
} else {
// reset variables
was_hot_before = 1;
temp_low_firstEvent = 1;
fan_off_allowed = 0;
}
if (temp_average >= FAN_ON_TEMP) {
FAN_ON;
} else if (REEDSW_CLOSED && fan_only.value == 1 && (temp_average <= FAN_OFF_TEMP_FANONLY)) {
//FAN_OFF;
} else if (REEDSW_CLOSED && fan_only.value == 0 && (temp_average <= FAN_OFF_TEMP)) {
if(fan_off_allowed) FAN_OFF;
} else if (REEDSW_OPEN) {
FAN_ON;
}
/////////////////////////////////
// MENU KEY HANDLING
/////////////////////////////////
// CHANGING THE TEMPERATURE
// - INCREASE BY 1
if (get_key_short(1 << KEY_UP)) {
button_input_time = millis();
if (temp_setpoint.value < temp_setpoint.value_max) {
temp_setpoint.value++;
}
temp_setpoint_saved = 0;
// - DECREASE BY 1
} else if (get_key_short(1 << KEY_DOWN)) {
button_input_time = millis();
if (temp_setpoint.value > temp_setpoint.value_min) {
temp_setpoint.value--;
}
temp_setpoint_saved = 0;
// - INCREASE BY 10
} else if (get_key_long_r(1 << KEY_UP) || get_key_rpt_l(1 << KEY_UP)) {
button_input_time = millis();
if (temp_setpoint.value < (temp_setpoint.value_max - 10)) {
temp_setpoint.value += 10;
} else {
temp_setpoint.value = temp_setpoint.value_max;
}
temp_setpoint_saved = 0;
// - DECREASE BY 10
} else if (get_key_long_r(1 << KEY_DOWN) || get_key_rpt_l(1 << KEY_DOWN)) {
button_input_time = millis();
if (temp_setpoint.value > (temp_setpoint.value_min + 10)) {
temp_setpoint.value -= 10;
} else {
temp_setpoint.value = temp_setpoint.value_min;
}
temp_setpoint_saved = 0;
// ENTER THE MENU
} else if (get_key_common_l(1 << KEY_UP | 1 << KEY_DOWN)) {
HEATER_OFF; // security reasons, delay below!
#ifdef USE_WATCHDOG
watchdog_off();
#endif
delay(uint16_t(20.48 * (REPEAT_START - 3) + 1));
if (get_key_long_r(1 << KEY_UP | 1 << KEY_DOWN)) {
change_config_parameter(&p_gain, "P");
change_config_parameter(&i_gain, "I");
change_config_parameter(&d_gain, "D");
change_config_parameter(&i_thresh, "ITH");
change_config_parameter(&temp_offset_corr, "TOF");
change_config_parameter(&temp_gain_corr, "TGN");
change_config_parameter(&temp_averages, "AVG");
change_config_parameter(&slp_timeout, "SLP");
change_config_parameter(&display_adc_raw, "ADC");
#ifdef CURRENT_SENSE_MOD
change_config_parameter(&fan_current_min, "FCL");
change_config_parameter(&fan_current_max, "FCH");
#else
change_config_parameter(&fan_speed_min, "FSL");
change_config_parameter(&fan_speed_max, "FSH");
#endif
// FAN ONLY MODE
// This mode is entered only at setup_858D() below
} else {
get_key_press(1 << KEY_UP | 1 << KEY_DOWN); // clear inp state
fan_only.value ^= 0x01;
temp_setpoint_saved = 0;
if (fan_only.value == 0) {
button_input_time = millis(); // show set temp after disabling fan only mode
}
display_blink = 0; // make sure we start displaying "FAN" or set temp
}
#ifdef USE_WATCHDOG
watchdog_on();
#endif
}
/////////////////////////////////
// TEMPERATURE SECURITY
/////////////////////////////////
if (temp_average >= MAX_TEMP_ERR) {
// something might have gone terribly wrong
HEATER_OFF;
FAN_ON;
#ifdef USE_WATCHDOG
watchdog_off();
#endif
while (1) {
// stay here until the power is cycled
// make sure the user notices the error by blinking "FAN"
// and don't resume operation if the error goes away on its own
//
// possible reasons to be here:
//
// * wand is not connected (false temperature reading)
// * thermo couple has failed
// * true over-temperature condition
//
display_string("*C");
delay(1000);
display_string("ERR");
delay(2000);
clear_display();
delay(1000);
}
}
/////////////////////////////////
// DISPLAY OUTPUT
/////////////////////////////////
if ((millis() - button_input_time) < SHOW_SETPOINT_TIMEOUT) {
if (display_blink < 5) {
clear_display();
} else {
display_number(temp_setpoint.value); // show temperature setpoint
}
} else {
if (temp_setpoint_saved == 0) {
set_eeprom_saved_dot();
eep_save(&temp_setpoint);
eep_save(&fan_only);
temp_setpoint_saved_time = millis();
temp_setpoint_saved = 1;
} else if (temp_average <= SAFE_TO_TOUCH_TEMP) {
if (fan_only.value == 1) {
display_string("FAN");
} else {
display_string("---");
}
} else if (fan_only.value == 1) {
if (display_blink < 20) {
display_string("FAN");
} else {
display_number(temp_average);
}
} else if (display_adc_raw.value == 1) {
display_number(adc_raw);
} else if (abs((int16_t) (temp_average) - (int16_t) (temp_setpoint.value)) < TEMP_REACHED_MARGIN) {
display_number(temp_setpoint.value); // avoid showing insignificant fluctuations on the display (annoying)
} else {
display_number(temp_average);
}
}
if ((millis() - temp_setpoint_saved_time) > 500) {
clear_eeprom_saved_dot();
}
fb_update();
#if defined(WATCHDOG_TEST) && defined(USE_WATCHDOG)
// watchdog test
if (temp_average > 100) {
delay(150);
}
#endif
#ifdef USE_WATCHDOG
wdt_reset();
#endif
#ifdef DEBUG
int32_t stop_time = micros();
Serial.println(stop_time - start_time);
#endif
}
}
void setup_858D(void)
{
HEATER_OFF;
DDRB |= _BV(PB1); // set as output for TRIAC control
DDRB &= ~(_BV(PB5) | _BV(PB2)); // set as inputs (switches)
PORTB |= (_BV(PB5) | _BV(PB2)); // pull-up on
DDRB &= ~_BV(PB4); // set as input (reed sensor)
PORTB |= _BV(PB4); // pull-up on
FAN_OFF;
DDRC |= _BV(PC3); // set as output (FAN control)
DDRD |= 0xFF; // all as outputs (7-seg segments)
DDRB |= (_BV(PB0) | _BV(PB6) | _BV(PB7)); // 7-seg digits 1,2,3
#ifdef CURRENT_SENSE_MOD
DDRC &= ~_BV(PC2); // set as input
#endif
setup_timer1_ctc(); // needed for background display refresh
analogReference(EXTERNAL); // use external 2.5V as ADC reference voltage (VCC / 2)
if (EEPROM.read(0) != 0x22) {
// check if the firmware was just flashed and the EEPROM is therefore empty
// assumption: full chip erase with ISP programmer (preserve eeprom fuse NOT set!)
// if so, restore default parameter values & write a 'hint' to address 0
restore_default_conf();
EEPROM.write(0, 0x22);
}
if (SW0_PRESSED && SW1_PRESSED) {
restore_default_conf();
} else if (SW0_PRESSED) {
display_string("FAN");
delay(1000);
display_string("TST");
delay(1000);
FAN_ON;
while (1) {
uint16_t fan;
delay(500);
#ifdef CURRENT_SENSE_MOD
fan = analogRead(A2);
#else //CURRENT_SENSE_MOD
fan = analogRead(A5);
#endif //CURRENT_SENSE_MOD
display_number(fan);
}
}
eep_load(&p_gain);
eep_load(&i_gain);
eep_load(&d_gain);
eep_load(&i_thresh);
eep_load(&temp_offset_corr);
eep_load(&temp_gain_corr);
eep_load(&temp_setpoint);
eep_load(&temp_averages);
eep_load(&slp_timeout);
eep_load(&fan_only);
eep_load(&display_adc_raw);
#ifdef CURRENT_SENSE_MOD
eep_load(&fan_current_min);
eep_load(&fan_current_max);
#else
eep_load(&fan_speed_min);
eep_load(&fan_speed_max);
#endif
}
void clear_display(void)
{
framebuffer.digit[0] = 255;
framebuffer.digit[1] = 255;
framebuffer.digit[2] = 255;
framebuffer.dot[0] = 0;
framebuffer.dot[1] = 0;
framebuffer.dot[2] = 0;
framebuffer.changed = 1;
fb_update();
}
void change_config_parameter(CPARAM * param, const char *string)
{
display_string(string);
delay(750); // let the user read what is shown
uint8_t loop = 1;
while (loop == 1) {
if (get_key_short(1 << KEY_UP)) {
if (param->value < param->value_max) {
param->value++;
}
} else if (get_key_short(1 << KEY_DOWN)) {
if (param->value > param->value_min) {
param->value--;
}
} else if (get_key_long_r(1 << KEY_UP) || get_key_rpt_l(1 << KEY_UP)) {
if (param->value < param->value_max - 10) {
param->value += 10;
}
} else if (get_key_long_r(1 << KEY_DOWN) || get_key_rpt_l(1 << KEY_DOWN)) {
if (param->value > param->value_min + 10) {
param->value -= 10;
}
} else if (get_key_common(1 << KEY_UP | 1 << KEY_DOWN)) {
loop = 0;
}
display_number(param->value);
}
set_eeprom_saved_dot();
eep_save(param);
delay(1000);
clear_eeprom_saved_dot();
}
void eep_save(CPARAM * param)
{
// make sure NOT to save invalid parameter values
if ((param->value >= param->value_min) && (param->value <= param->value_max)) {
// nothing to do
} else {
// reset to sensible minimum
param->value = param->value_default;
}
EEPROM.update(param->eep_addr_high, highByte(param->value));
EEPROM.update(param->eep_addr_low, lowByte(param->value));
}
void eep_load(CPARAM * param)
{
int16_t tmp = (EEPROM.read(param->eep_addr_high) << 8) | EEPROM.read(param->eep_addr_low);
// make sure NOT to restore invalid parameter values
if ((tmp >= param->value_min) && (tmp <= param->value_max)) {
// the value was good, so we use it
param->value = tmp;
} else {
// reset to sensible value
param->value = param->value_default;
}
}
void restore_default_conf(void)
{
p_gain.value = p_gain.value_default;
i_gain.value = i_gain.value_default;
d_gain.value = d_gain.value_default;
i_thresh.value = i_thresh.value_default;
temp_offset_corr.value = temp_offset_corr.value_default;
temp_gain_corr.value = temp_gain_corr.value_default;
temp_setpoint.value = temp_setpoint.value_default;
temp_averages.value = temp_averages.value_default;
slp_timeout.value = slp_timeout.value_default;
fan_only.value = 0;
display_adc_raw.value = 0;
#ifdef CURRENT_SENSE_MOD
fan_current_min.value = fan_current_min.value_default;
fan_current_max.value = fan_current_max.value_default;
#else
fan_speed_min.value = fan_speed_min.value_default;
fan_speed_max.value = fan_speed_max.value_default;
#endif
eep_save(&p_gain);
eep_save(&i_gain);
eep_save(&d_gain);
eep_save(&i_thresh);
eep_save(&temp_offset_corr);
eep_save(&temp_gain_corr);
eep_save(&temp_setpoint);
eep_save(&temp_averages);
eep_save(&slp_timeout);
eep_save(&fan_only);
eep_save(&display_adc_raw);
#ifdef CURRENT_SENSE_MOD
eep_save(&fan_current_min);
eep_save(&fan_current_max);
#else
eep_save(&fan_speed_min);
eep_save(&fan_speed_max);
#endif
}
void set_dot(void)
{
framebuffer.dot[0] = 1;
framebuffer.changed = 1;
fb_update();
}
void clear_dot(void)
{
framebuffer.dot[0] = 0;
framebuffer.changed = 1;
fb_update();
}
void set_eeprom_saved_dot(void)
{
framebuffer.dot[1] = 1;
framebuffer.changed = 1;
fb_update();
}
void clear_eeprom_saved_dot(void)
{
framebuffer.dot[1] = 0;
framebuffer.changed = 1;
fb_update();
}
/**
* \brief display a number.
*
* This function displays a number on the 7-segment display.
* Related functions:
* display_char()
* display_string()
*
* \param[in] number number to display (negative numbers => underflow on the display)
* \return void
*/
void display_number(int16_t number)
{
if (number < 0) {
framebuffer.dot[0] = 1;
framebuffer.dot[1] = 1;
framebuffer.dot[2] = 1;
number = -number;
} else {
// don't clear framebuffer[3], as this is the heater-indicator
framebuffer.dot[1] = 0;
framebuffer.dot[2] = 0;
}
framebuffer.digit[0] = (uint8_t) (number % 10);
number /= 10;
framebuffer.digit[1] = (uint8_t) (number % 10);
number /= 10;
framebuffer.digit[2] = (uint8_t) (number % 10);
framebuffer.changed = 1;
fb_update();
}
/**
* \brief display a character.
*
* This function displays a character at a given position on the 7-segment display.
*
* \param[in] digit position (0-2)
* \param[in] character character to display (e.g. 'A' or '1')
* \param[in] dot if > 0: activate the dot behind the given position
* \return void
*/
void display_char(uint8_t digit, uint8_t character, uint8_t dot)
{
uint8_t portout = 0xFF;
// 8 Bit
// -> '0'-Bit: active
// -> '1'-Bit: not active
// 0b0000_0000
// |||| |||'--- top
// |||| ||'---- bottom-left
// |||| |'----- bottom
// |||| '------ top-left
// |||'-------- dot (on the right side of the segment)
// ||'--------- bottom-right
// |'---------- middle
// '----------- top-right
switch (character) {
case 0:
// ~0b1010_1111 = 0b0101_0000
portout = (uint8_t) (~0xAF); // activate segments for displaying a '0'
break;
case 1:
// ~0b1010_0000 = 0b0101_1111
portout = (uint8_t) (~0xA0); // '1'
break;
case 2:
// ~0b1100_0111 = 0b0011_1000
portout = (uint8_t) (~0xC7); // '2'
break;
case 3:
// ~0b1110_0101 = 0b0001_1010
portout = (uint8_t) (~0xE5); // '3'
break;
case 4:
portout = (uint8_t) (~0xE8); // '4'
break;
case 5:
portout = (uint8_t) (~0x6D); // '5'
break;
case 6:
portout = (uint8_t) (~0x6F); // '6'
break;
case 7:
// ~0b10100001 = 0b01011110
portout = (uint8_t) (~0xA1); // '7'
break;
case 8:
portout = (uint8_t) (~0xEF); // '8'
break;
case 9:
portout = (uint8_t) (~0xE9); // '9'
break;
case '-':
portout = (uint8_t) (~0x40); // '-'
break;
case '.':
// ~0b0001_0000 = 0b1110_1111
portout = (uint8_t) (~0x10); // '.'
break;
case 'A':
portout = (uint8_t) (~0xEB); // 'A'
break;
case 'B':
portout = (uint8_t) (~0x6E); // 'b'
break;
case 'C':
portout = (uint8_t) (~0x0F); // 'C'
break;
case 'D':
portout = (uint8_t) (~0xE6); // 'd'
break;
case 'E':
portout = (uint8_t) (~0x4F); // 'E'
break;
case 'F':
portout = (uint8_t) (~0x4B); // 'F'
break;
case 'G':
portout = (uint8_t) (~0x6F); // 'G'
break;
case 'H':
portout = (uint8_t) (~0x6A); // 'h'
break;
case 'I':
portout = (uint8_t) (~0x20); // 'i'
break;
case 'L':
portout = (uint8_t) (~0x0E); // 'L'
break;
case 'N':
portout = (uint8_t) (~0xAB); // 'N'
break;
case 'O':
portout = (uint8_t) (~0x66); // 'o'
break;
case 'P':
portout = (uint8_t) (~0xCB); // 'P'
break;
case 'R':
portout = (uint8_t) (~0x42); // 'r'
break;
case 'S':
portout = (uint8_t) (~0x6D); // 'S'
break;
case 'T':
portout = (uint8_t) (~0x4E); // 't'
break;
case 'U':
portout = (uint8_t) (~0x26); // 'u'
break;
case 'V':
portout = (uint8_t) (~0x26); // 'v'
break;
case '*':
portout = (uint8_t) (~0xC9); // '°'
break;
case ' ':
case 255:
portout = (uint8_t) (0xFF); // segments OFF
break;
default:
portout = (uint8_t) (~0x10); // '.'
break;
}
if (dot)
portout &= (~0x10); // '.'
fb[digit] = portout;
}
/**
* \brief display a string.
*
* This function displays a string on the 7-segment display.
* It reads only the first three characters.
*
* \param[in] *string pointer to the string to display
* \return void
*/
void display_string(const char *string)
{
framebuffer.digit[0] = 255;
framebuffer.digit[1] = 255;
framebuffer.digit[2] = 255;
framebuffer.dot[0] = 0;
framebuffer.dot[1] = 0;
framebuffer.dot[2] = 0;
uint8_t ctr;
for (ctr = 0; ctr <= 2; ctr++) {
// read the first 3 characters of the string
if (string[ctr] == '\0') {
break;
} else {
framebuffer.digit[2 - ctr] = string[ctr];
}
}
framebuffer.changed = 1;
fb_update();
}
/**
* \brief display a string.
*
* This function displays a running string on the 7-segment display.
* It reads out and displays every character until a '\0' is reached.
* CAUTION! Always be sure that your string is null-terminated
* CAUTION! This functions is blocking...
*
* The standard delay is 500ms
*
* \param[in] *string pointer to the c-string to display
* \return void
*/
void display_string_running(const char* string)
{
// empty string, return
if(string[0] == '\0')
return;
// string isn't long enough for "running", hence display normally
if(string[1] == '\0' | string[2] == '\0' | string[3] == '\0')
display_string(string);