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tools_misc.c
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/* ************************************************************************
*
* misc tools (hardware and software options)
*
* (c) 2012-2023 by Markus Reschke
*
* ************************************************************************ */
/*
* local constants
*/
/* source management */
#define TOOLS_MISC_C
/*
* include header files
*/
/* local includes */
#include "config.h" /* global configuration */
#include "common.h" /* common header file */
#include "variables.h" /* global variables */
#include "functions.h" /* external functions */
#include "colors.h" /* color definitions */
/* ************************************************************************
* support functions
* ************************************************************************ */
#ifdef FUNC_PROBE_PINOUT
/*
* display probe pinout
*
* required:
* - Mode
* PROBES_PWM PWM signal
* PROBES_ESR ESR measurement
* PROBES_RCL monitoring RCL
* PROBES_RINGTESTER ring tester
* PROBES_DIODE diode
*/
void ProbePinout(uint8_t Mode)
{
uint8_t Char1 = 0; /* designator for probe #1 */
uint8_t Char2 = 0; /* designator for probe #2 */
uint8_t Char3 = 0; /* designator for probe #3 */
LCD_ClearLine2(); /* info goes to line #2 */
/*
* set probe pinout based on mode
*/
switch (Mode)
{
#ifdef SW_PROBEPINOUT_PWM
case PROBES_PWM:
/* probe #1: Gnd / probe #2: signal / probe #3: Gnd */
Char1 = '-';
Char2 = 's';
Char3 = '-';
break;
#endif
#ifdef SW_PROBEPINOUT_ESR
case PROBES_ESR:
/* probe #1: + / probe #3: - */
Char1 = '+';
Char2 = 0;
Char3 = '-';
break;
#endif
#ifdef SW_PROBEPINOUT_RCL
case PROBES_RCL:
/* probe #1: * / probe #3: * */
Char1 = '*';
Char2 = 0;
Char3 = '*';
break;
#endif
#if defined (HW_RING_TESTER) && defined (RING_TESTER_PROBES)
case PROBES_RINGTESTER:
/* probe #1: Vcc / probe #2: pulse out / probe #3: Gnd */
Char1 = '+';
Char2 = 'p';
Char3 = '-';
break;
#endif
#if defined (SW_PHOTODIODE)
case PROBES_DIODE:
/* probe #1: Anode / probe #3: Cathode */
Char1 = 'A';
Char2 = 0;
Char3 = 'C';
break;
#endif
}
Show_SimplePinout(Char1, Char2, Char3); /* display pinout */
/* wait for any key press or 5s */
TestKey(5000, CHECK_BAT);
LCD_ClearLine2(); /* clear line #2 */
}
#endif
/* ************************************************************************
* Zener tool / external voltage
* ************************************************************************ */
#if defined (HW_ZENER) && ! defined (ZENER_UNSWITCHED)
/*
* Zener tool (standard mode)
* - hardware option for voltage measurement of Zener diode
* - uses dedicated analog input (TP_ZENER) with voltage divider
* (default 10:1)
* - boost converter enabled by test push button (default) or
* dedicated I/O pin (switched mode)
*/
void Zener_Tool(void)
{
uint8_t Run = 1; /* control flag */
uint8_t Counter; /* length of key press */
uint8_t Counter2 = 0; /* time between two key presses */
uint16_t U1; /* current voltage */
uint16_t Min = UINT16_MAX; /* minimal voltage */
#ifdef ZENER_DIVIDER_CUSTOM
uint32_t Value; /* value */
#endif
/* show info */
LCD_Clear();
#ifdef UI_COLORED_TITLES
/* display: Zener */
Display_ColoredEEString(Zener_str, COLOR_TITLE);
#else
Display_EEString(Zener_str); /* display: Zener */
#endif
Display_NextLine(); /* line #2 */
Display_Minus(); /* display "no value" */
#ifdef UI_ZENER_DIODE
/* display Zener diode symbol */
Check.Symbol = SYMBOL_DIODE_ZENER; /* set symbol ID */
Display_FancySemiPinout(3); /* show symbol starting in line #3 */
#endif
/*
* processing loop
*/
while (Run > 0)
{
/*
* manage timing
*/
Counter = 0; /* reset key press time */
MilliSleep(30); /* delay by 30ms */
Counter2++; /* increase delay time counter */
if (Counter2 > 200) /* prevent overflow & timer (about 6s) */
{
Counter2 = 10; /* reset counter (above delay for quick key presses) */
#ifndef BAT_NONE
CheckBattery(); /* and check battery */
#endif
}
/*
* key press triggers measurement
* - also enables boost converter via hardware
* - two short key presses exit tool
*/
while (!(BUTTON_PIN & (1 << TEST_BUTTON))) /* as long as key is pressed */
{
#ifdef ZENER_SWITCHED
/* turn on boost converter */
#ifdef ZENER_BOOST_HIGH
/* high active */
BOOST_PORT |= (1 << BOOST_CTRL); /* set pin high */
#else
/* low active */
BOOST_PORT &= ~(1 << BOOST_CTRL); /* set pin low */
#endif
#endif
/* get voltage (10:1 voltage divider) */
U1 = ReadU(TP_ZENER); /* read voltage (in mV) */
#ifndef ZENER_DIVIDER_CUSTOM
/* ADC pin is connected to a 10:1 voltage divider */
/* so U1's scale is 10mV */
#endif
#ifdef ZENER_DIVIDER_CUSTOM
/*
* ADC pin is connected to a voltage divider (top: R1 / bottom: R2).
* - U2 = (Uin / (R1 + R2)) * R2
* - Uin = (U2 * (R1 + R2)) / R2
*/
Value = (((uint32_t)(ZENER_R1 + ZENER_R2) * 1000) / ZENER_R2); /* factor (0.001) */
Value *= U1; /* voltage (0.001 mV) */
Value /= 1000; /* scale to mV */
U1 = (uint16_t)Value; /* keep 2 bytes */
#endif
/* display voltage */
if (Counter % 8 == 0) /* every 8 loop runs (240ms) */
{
LCD_ClearLine2(); /* clear line #2 */
#ifndef ZENER_DIVIDER_CUSTOM
Display_Value(U1, -2, 'V'); /* display current voltage (10mV) */
#else
Display_Value(U1, -3, 'V'); /* display current voltage (1mV) */
#endif
}
/* data hold */
if (Counter == 0) /* first loop run */
{
Min = UINT16_MAX; /* reset minimum to default */
}
else if (Counter >= 10) /* ensure stable voltage */
{
if (U1 < Min) Min = U1; /* update minimum */
}
/* timing */
MilliSleep(30); /* delay next run / also debounce by 30ms */
Counter++; /* increase key press time counter */
if (Counter > 100) /* prevent overflow & timer (about 3s) */
{
Counter = 12; /* reset counter (above time for short key press) */
#ifndef BAT_NONE
CheckBattery(); /* and check battery */
#endif
}
}
#ifdef ZENER_SWITCHED
/* turn off boost converter */
#ifdef ZENER_BOOST_HIGH
/* high active */
BOOST_PORT &= ~(1 << BOOST_CTRL); /* set pin low */
#else
/* low active */
BOOST_PORT |= (1 << BOOST_CTRL); /* set pin high */
#endif
#endif
/*
* user interface logic
*/
if (Counter > 0) /* key was pressed */
{
/* detect two quick key presses */
if (Run == 2) /* flag for short key press set */
{
if (Counter2 <= 8) /* short delay between key presses <= 250ms */
{
Run = 0; /* end loop */
}
else /* long delay between key presses */
{
Run = 1; /* reset flag */
}
}
else /* flag not set */
{
if (Counter <= 10) /* short key press <= 300ms */
{
Run = 2; /* set flag */
}
}
/* display hold value */
LCD_ClearLine2();
if (Min != UINT16_MAX) /* got updated value */
{
#ifndef ZENER_DIVIDER_CUSTOM
Display_Value(Min, -2, 'V'); /* display minimal voltage */
#else
Display_Value(Min, -3, 'V'); /* display minimal voltage */
#endif
Display_Space();
Display_EEString(Min_str); /* display: Min */
}
else /* unchanged default */
{
Display_Minus(); /* display "no value" */
}
Counter2 = 0; /* reset delay time */
}
}
}
#endif
#if defined (HW_ZENER) && defined (ZENER_UNSWITCHED)
/*
* Zener tool (alternative mode: unswitched boost converter)
* - hardware option for voltage measurement of Zener diode
* or external voltage
* - uses dedicated analog input (TP_ZENER) with voltage divider
* (default 10:1)
* - boost converter runs all the time or circuit without boost
* converter (just measuring external voltage)
*/
void Zener_Tool(void)
{
uint8_t Run = 1; /* control flag */
uint8_t Test; /* user feedback */
uint16_t U1; /* voltage */
#ifdef ZENER_DIVIDER_CUSTOM
uint32_t Value; /* value */
#endif
/* show info */
LCD_Clear();
#ifdef UI_COLORED_TITLES
/* display: Zener */
Display_ColoredEEString(Zener_str, COLOR_TITLE);
#else
Display_EEString(Zener_str); /* display: Zener */
#endif
#ifdef UI_ZENER_DIODE
/* display Zener diode symbol */
Check.Symbol = SYMBOL_DIODE_ZENER; /* set symbol ID */
Display_FancySemiPinout(3); /* show symbol starting in line #3 */
#endif
/*
* processing loop
*/
while (Run)
{
/* get voltage */
U1 = ReadU(TP_ZENER); /* read voltage (in mV) */
#ifndef ZENER_DIVIDER_CUSTOM
/* ADC pin is connected to a 10:1 voltage divider */
/* so U1's scale is 10mV */
#endif
#ifdef ZENER_DIVIDER_CUSTOM
/*
* ADC pin is connected to a voltage divider (top: R1 / bottom: R2).
* - U2 = (Uin / (R1 + R2)) * R2
* - Uin = (U2 * (R1 + R2)) / R2
*/
Value = (((uint32_t)(ZENER_R1 + ZENER_R2) * 1000) / ZENER_R2); /* factor (0.001) */
Value *= U1; /* voltage (0.001 mV) */
Value /= 1000; /* scale to mV */
U1 = (uint16_t)Value; /* keep 2 bytes */
#endif
/* display voltage */
LCD_ClearLine2(); /* clear line #2 */
#ifndef ZENER_DIVIDER_CUSTOM
Display_Value(U1, -2, 'V'); /* display current voltage */
#else
Display_Value(U1, -3, 'V'); /* display current voltage */
#endif
/* user feedback (1s delay) */
Test = TestKey(1000, CHECK_KEY_TWICE | CHECK_BAT | CURSOR_STEADY);
if (Test == KEY_TWICE) /* two short key presses */
{
Run = 0; /* end processing loop */
}
}
}
#endif
#ifdef HW_PROBE_ZENER
/*
* check for Zener diode
* - hardware option for voltage measurement of Zener diode
* or external voltage
* - uses dedicated analog input (TP_ZENER) with voltage divider
* (default 10:1)
* - boost converter runs all the time, circuit without boost
* converter (just measuring external voltage), or boost converter
* switched by dedicated I/O pin
*/
void CheckZener(void)
{
uint16_t U1; /* voltage */
#ifdef ZENER_DIVIDER_CUSTOM
uint32_t Value; /* value */
#endif
#ifdef ZENER_SWITCHED
/* turn on boost converter */
#ifdef ZENER_BOOST_HIGH
/* high active */
BOOST_PORT |= (1 << BOOST_CTRL); /* set pin high */
#else
/* low active */
BOOST_PORT &= ~(1 << BOOST_CTRL); /* set pin low */
#endif
MilliSleep(300); /* time for stabilization */
#endif
/* get voltage */
U1 = ReadU(TP_ZENER); /* read voltage (in mV) */
#ifdef ZENER_SWITCHED
/* turn off boost converter */
#ifdef ZENER_BOOST_HIGH
/* high active */
BOOST_PORT &= ~(1 << BOOST_CTRL); /* set pin low */
#else
/* low active */
BOOST_PORT |= (1 << BOOST_CTRL); /* set pin high */
#endif
#endif
#ifndef ZENER_DIVIDER_CUSTOM
/* ADC pin is connected to a 10:1 voltage divider */
U1 *= 10; /* voltage (mV) */
#endif
#ifdef ZENER_DIVIDER_CUSTOM
/*
* ADC pin is connected to a voltage divider (top: R1 / bottom: R2).
* - U2 = (Uin / (R1 + R2)) * R2
* - Uin = (U2 * (R1 + R2)) / R2
*/
Value = (((uint32_t)(ZENER_R1 + ZENER_R2) * 1000) / ZENER_R2); /* factor (0.001) */
Value *= U1; /* voltage (0.001 mV) */
Value /= 1000; /* scale to mV */
U1 = (uint16_t)Value; /* keep 2 bytes */
#endif
/* check for valid voltage */
if ((U1 >= ZENER_VOLTAGE_MIN) && (U1 <= ZENER_VOLTAGE_MAX))
{
Check.Found = COMP_ZENER; /* we got a Zener */
Semi.U_1 = U1; /* save voltage (V_Z) */
}
}
#endif
/* ************************************************************************
* ESR tool
* ************************************************************************ */
#ifdef SW_ESR_TOOL
/*
* ESR tool
* - uses probe #1 (pos) and probe #3 (neg)
*/
void ESR_Tool(void)
{
uint8_t Run = 1; /* control flag */
uint8_t Test; /* temp. value */
Capacitor_Type *Cap; /* pointer to cap */
uint16_t ESR; /* ESR (in 0.01 Ohms) */
Check.Diodes = 0; /* disable diode check in cap measurement */
Cap = &Caps[0]; /* pointer to first cap */
#ifdef HW_DISCHARGE_RELAY
/* discharge relay: short circuit probes */
/* ADC_PORT should be 0 */
ADC_DDR = (1 << TP_REF); /* disable relay */
#endif
/* show tool info */
LCD_Clear();
#ifdef UI_COLORED_TITLES
/* display: ESR */
Display_ColoredEEString(ESR_str, COLOR_TITLE);
#else
Display_EEString(ESR_str); /* display: ESR */
#endif
ProbePinout(PROBES_ESR); /* show probes used */
Display_Minus(); /* display "no value" */
while (Run > 0)
{
/*
* short or long key press -> measure
* two short key presses -> exit tool
*/
/* wait for user feedback */
Test = TestKey(0, CURSOR_BLINK | CHECK_KEY_TWICE | CHECK_BAT);
if (Test == KEY_TWICE) /* two short key presses */
{
Run = 0; /* end loop */
}
/* measure cap */
if (Run > 0) /* key pressed */
{
#ifdef HW_DISCHARGE_RELAY
/* discharge relay: remove short circuit */
/* ADC_PORT should be 0 */
ADC_DDR = 0; /* enable relay (via extrenal reference) */
#endif
LCD_ClearLine2(); /* update line #2 */
Display_EEString(Probing_str); /* display: probing... */
Check.Found = COMP_NONE; /* no component */
MeasureCap(PROBE_1, PROBE_3, 0); /* probe-1 = Vcc, probe-3 = Gnd */
LCD_ClearLine2(); /* update line #2 */
if (Check.Found == COMP_CAPACITOR) /* found capacitor */
{
/* show capacitance */
Display_Value(Cap->Value, Cap->Scale, 'F');
/* show ESR */
Display_Space();
ESR = MeasureESR(Cap);
if (ESR < UINT16_MAX) /* got valid ESR */
{
Display_Value(ESR, -2, LCD_CHAR_OMEGA);
}
else /* no ESR */
{
Display_Minus();
}
}
else /* no capacitor */
{
Display_Minus();
}
#ifdef HW_DISCHARGE_RELAY
ADC_DDR = (1 << TP_REF); /* short circuit probes */
#endif
}
}
#ifdef HW_DISCHARGE_RELAY
ADC_DDR = 0; /* remove short circuit */
#endif
}
#endif
/* ************************************************************************
* rotary encoder check
* ************************************************************************ */
#ifdef SW_ENCODER
/* local constants for direction */
#define DIR_NONE 0b00000000 /* no turn or error */
#define DIR_RIGHT 0b00000001 /* turned to the right */
#define DIR_LEFT 0b00000010 /* turned to the left */
/*
* check rotary encoder
*
* requires:
* - pointer to encoder history
*/
uint8_t CheckEncoder(uint8_t *History)
{
uint8_t Action = DIR_NONE; /* return value */
uint8_t Old_AB; /* old AB state */
uint8_t AB = 0; /* new AB state */
uint8_t Dir; /* turning direction */
uint8_t Steps; /* encoder steps */
uint8_t Temp; /* temporary value */
/* we assume: probe-1 = A / probe-2 = B / probe-3 = Common */
/* set up probes: probe-1 -- Rl -- Vcc / probe-2 -- Rl -- Vcc / Gnd -- probe-3 */
R_PORT = Probes.Rl_1 | Probes.Rl_2; /* pullup via Rl */
R_DDR = Probes.Rl_1 | Probes.Rl_2; /* enable pull-up resistors */
ADC_PORT = 0; /* pull down directly */
ADC_DDR = Probes.Pin_3; /* enable Gnd for probe-3 */
wait500us(); /* settle time */
/* get A & B signals */
Temp = ADC_PIN;
if (Temp & Probes.Pin_1) AB = 0b00000010;
if (Temp & Probes.Pin_2) AB |= 0b00000001;
R_DDR = 0; /* reset probes */
ADC_DDR = 0;
/* unpack history */
Temp = *History;
Old_AB = Temp & 0b00000011; /* old AB state, first 2 bits */
Temp >>=2 ; /* move 2 bits */
Dir = Temp & 0b00000011; /* direction, next 2 bits */
Temp >>= 2; /* move 2 bits */
Steps = Temp; /* steps, remaining 4 bits */
/* update state history */
if (Dir == (DIR_RIGHT | DIR_LEFT)) /* first scan */
{
Old_AB = AB; /* set as last state */
Dir = DIR_NONE; /* reset direction */
}
/* process signals */
if (Old_AB != AB) /* signals changed */
{
/* check if only one bit has changed (Gray code) */
Temp = AB ^ Old_AB; /* get bit difference */
if (!(Temp & 0b00000001)) Temp >>= 1;
if (Temp == 1) /* valid change */
{
/* determine direction */
/* Gray code: 00 01 11 10 */
Temp = 0b10001101; /* expected values for a right turn */
Temp >>= (Old_AB * 2); /* get expected value by shifting */
Temp &= 0b00000011; /* select value */
if (Temp == AB) /* value matches */
Temp = DIR_RIGHT; /* turn to the right */
else /* value mismatches */
Temp = DIR_LEFT; /* turn to the left */
/* detection logic */
if (Temp == Dir) /* turn in same direction */
{
Steps++; /* got another step */
/* for proper detection we need 4 Gray code steps */
if (Steps == 4) /* got 4 steps */
{
LCD_ClearLine2();
/*
* The turning direction determines A and B:
* - right: A = Probe #1 / B = Probe #2
* - left: A = Probe #2 / B = Probe #1
*/
if (Dir == DIR_RIGHT) /* right */
{
Semi.A = Probes.ID_1;
Semi.B = Probes.ID_2;
}
else /* left */
{
Semi.A = Probes.ID_2;
Semi.B = Probes.ID_1;
}
Semi.C = Probes.ID_3; /* Common */
/* display pinout */
Semi.DesA = 'A'; /* pin designator for A */
Semi.DesB = 'B'; /* pin designator for B */
Semi.DesC = 'C'; /* pin designator for C */
Show_SemiPinout();
Steps = 0; /* reset steps */
Action = Temp; /* signal valid step */
}
}
else /* turn has changed direction */
{
Steps = 1; /* first step for new direction */
}
Dir = Temp; /* update direction */
}
else /* invalid change */
{
Dir = DIR_RIGHT | DIR_LEFT; /* trigger reset of history */
}
}
/* pack new history */
Temp = AB; /* AB state, first 2 bits */
Dir <<= 2; /* direction, next 2 bits */
Temp |= Dir;
Steps <<= 4; /* steps, remaining 4 bits */
Temp |= Steps;
*History = Temp; /* save new history */
return Action;
}
/*
* rotary encoder check
* - uses standard probes
*/
void Encoder_Tool(void)
{
uint8_t Flag; /* flag/counter */
uint8_t History[3]; /* encoder history */
/*
* History:
* - 000000xx AB state
* - 0000xx00 turning direction
* - xxxx0000 steps
*/
/* show info */
LCD_Clear();
#ifdef UI_COLORED_TITLES
/* display: Rotary Encoder */
Display_ColoredEEString(Encoder_str, COLOR_TITLE);
#else
Display_EEString(Encoder_str); /* display: Rotary Encoder */
#endif
/* init array */
for (Flag = 0; Flag <= 2; Flag++)
{
History[Flag] = (DIR_RIGHT | DIR_LEFT) << 2;
}
/* processing loop */
Flag = 5;
while (Flag < 10)
{
wdt_reset();
if (Flag == 5) /* ask user to turn */
{
LCD_ClearLine2();
Display_EEString(TurnRight_str); /* display: Turn right! */
Flag = 0; /* reset flag */
}
UpdateProbes(PROBE_1, PROBE_2, PROBE_3); /* check first pinout */
Flag = CheckEncoder(&History[0]);
if (Flag == 0)
{
UpdateProbes(PROBE_1, PROBE_3, PROBE_2); /* check second pinout */
Flag = CheckEncoder(&History[1]);
}
if (Flag == 0)
{
UpdateProbes(PROBE_2, PROBE_3, PROBE_1); /* check third pinout */
Flag = CheckEncoder(&History[2]);
}
if (Flag > 0) /* detected encoder */
{
/* let the user read or skip the text */
TestKey(3000, CURSOR_STEADY | CHECK_OP_MODE | CHECK_BAT);
Flag = 5; /* reset flag */
}
else /* nothing found yet */
{
if (!(BUTTON_PIN & (1 << TEST_BUTTON))) /* if key is pressed */
{
MilliSleep(100); /* smooth UI */
Flag = 10; /* end loop */
}
}
}
}
/* clean up local constants for direction */
#undef DIR_LEFT
#undef DIR_RIGHT
#undef DIR_NONE
#endif
/* ************************************************************************
* opto coupler check
* ************************************************************************ */
#ifdef SW_OPTO_COUPLER
/*
* check for LED
* - simple wrapper for CheckDiode()
*
* requires:
* - Probe1: ID of positive probe (anode)
* - Probe2: ID of negative probe (cathode)
*/
void Check_LED(uint8_t Probe1, uint8_t Probe2)
{
uint16_t U1; /* voltage */
UpdateProbes2(Probe1, Probe2); /* update probes */
/* we assume: probe-1 = A / probe2 = C */
/* set probes: Gnd -- Rl -- probe-2 / probe-1 -- Vcc */
R_PORT = 0; /* set resistor port to Gnd */
R_DDR = Probes.Rl_2; /* pull down probe-2 via Rl */
ADC_DDR = Probes.Pin_1; /* set probe-1 to output */
ADC_PORT = Probes.Pin_1; /* pull-up probe-1 directly */
U1 = ReadU_5ms(Probes.Ch_2); /* voltage at Rl (cathode) */
if (U1 >= 977) /* not just a leakage current (> 1.4mA) */
{
CheckDiode(); /* run standard diode check */
}
}
/*
* check opto couplers
* - uses standard probes
* - pins which have to be connected (common Gnd):
* - LED's cathode and BJT's emitter
* - LED's cathode and TRIAC's MT2
* - supports:
* - BJT
* - TRIAC (with and without zero crossing circuit)
*/
void OptoCoupler_Tool(void)
{
uint8_t Run = 1; /* loop control */
uint8_t Test; /* user input */
uint16_t U1, U2; /* voltages */
uint16_t U3, U4; /* voltages */
uint32_t CTR = 0; /* CTR in % */
/* local constants for status */
#define DETECTED_LED 50
#define DETECTED_BJT 100
#define DETECTED_TRIAC 101
/* init */
/* next-line mode: keep first line and wait for key/timeout */
UI.LineMode = LINE_KEEP | LINE_KEY;
/* display info */
LCD_Clear();
#ifdef UI_COLORED_TITLES
/* display: Opto Coupler */
Display_ColoredEEString(OptoCoupler_str, COLOR_TITLE);
#else
Display_EEString(OptoCoupler_str); /* display: Opto Coupler */
#endif
Display_NL_EEString(Start_str); /* display: Start */
/*
* processing loop
*/
while (Run)
{
/* user input */
/* wait for user feedback */
Test = TestKey(0, CURSOR_BLINK | CHECK_KEY_TWICE | CHECK_BAT);
if (Test == KEY_TWICE) /* two short key presses */
{
Run = 0; /* end loop */
}
if (Run) /* check opto coupler */
{
/* update display */
LCD_Clear();
#ifdef UI_SERIAL_COPY
Display_Serial_On(); /* enable serial output & NL */
#endif
#ifdef UI_COLORED_TITLES
/* display: Opto Coupler */
Display_ColoredEEString(OptoCoupler_str, COLOR_TITLE);
#else
Display_EEString(OptoCoupler_str); /* display: Opto Coupler */
#endif
Display_NextLine();
Test = 0; /* reset status */
/*
* scan for LED
*/
Check.Found = COMP_NONE; /* reset component search */
Check.Diodes = 0; /* reset number of diodes */
/* check all possible probe combinations */
Check_LED(PROBE_1, PROBE_2);
Check_LED(PROBE_2, PROBE_1);
Check_LED(PROBE_1, PROBE_3);
Check_LED(PROBE_3, PROBE_1);
Check_LED(PROBE_2, PROBE_3);
Check_LED(PROBE_3, PROBE_2);
if (Check.Diodes == 1) /* got one */
{
/* update probes for remaining checks (3rd probe is done automatically) */
UpdateProbes2(Diodes[0].A, Diodes[0].C);
Test = DETECTED_LED; /* proceed with other checks */
}
/*
* we assume:
* probe-1 = LED's anode
* probe-2 = LED's cathode & BJT's emitter or TRIAC's MT2
* probe-3 = BJT's collector or TRIAC's MT1
*/
/*
* check for BJT and TRIAC
* - BJT conducts only while LED is lit.
* - TRIAC keeps conducting as long as load current flows.
* Some types with zero crossing circuit got an inhibit voltage
* of about 5V.
*/
if (Test == DETECTED_LED) /* LED detected */
{
/* set probes: probe-2 -- Gnd / probe-3 -- Rl -- Vcc */
ADC_DDR = Probes.Pin_2; /* set probe-2 to output */
ADC_PORT = 0; /* pull down probe-2 directly */
R_DDR = Probes.Rl_1 | Probes.Rl_3; /* select Rl for probe-1 & Rl for probe-3 */
R_PORT = Probes.Rl_3; /* pull up collector via Rl */
U1 = ReadU_5ms(Probes.Ch_3); /* voltage at collector when LED is off */
/* make sure we have no conduction without the LED lit */
if (U1 > 4000) /* allow a leakage current of 1.5mA */
{
/* simulate zero crossing in case of a TRIAC with zero crossing circuit */
R_PORT = Probes.Rl_1; /* turn on LED */
wait1ms(); /* wait a tad */
R_PORT = Probes.Rl_1 | Probes.Rl_3; /* also pull up collector via Rl */
U1 = ReadU_5ms(Probes.Ch_3); /* voltage at collector when LED is on */
R_PORT = Probes.Rl_3; /* turn off LED */
U2 = ReadU_5ms(Probes.Ch_3); /* voltage at collector when LED is off */
/* we should have conduction when the LED is lit */
if (U1 <= 4000) /* more than 1.5mA */
{
if (U2 >= 4000) /* no conduction, allow some leakage current */
{
Test = DETECTED_BJT; /* BJT type */
}
else /* conduction */