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adjust.c
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/* ************************************************************************
*
* self-adjustment functions
*
* (c) 2012-2024 by Markus Reschke
* based on code from Markus Frejek and Karl-Heinz Kübbeler
*
* ************************************************************************ */
/*
* local constants
*/
/* source management */
#define ADJUST_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 */
/* ************************************************************************
* storage of adjustment values in EEPROM
* ************************************************************************ */
#if defined (CAP_MULTIOFFSET) || defined (R_MULTIOFFSET)
/*
* determine index number for a probe-pair specific offset stored in an array
* - offset array format:
* Offset[3] = {Offset_12, Offset_13, Offset_23}
*
* requires:
* - Probe1: ID of first probe (0-2)
* - Probe2: ID of second probe (0-2)
*
* returns:
* - array index number for probe-pair specific offset (0-2)
*/
uint8_t GetOffsetIndex(uint8_t Probe1, uint8_t Probe2)
{
uint8_t Index;
/*
* - use sum of probe IDs (order doesn't matter):
* probes #1 & #2: 0 + 1 = 1 -> index: 0
* probes #1 & #3: 0 + 2 = 2 -> index: 1
* probes #2 & #3: 1 + 2 = 3 -> index: 2
* - index = (sum of probe IDs) - 1
*/
Index = Probe1 + Probe2;
Index--;
return Index;
}
#endif
/*
* set default adjustment values
*/
void SetAdjustmentDefaults(void)
{
/*
* set defaults for basic offsets/values
*/
/* MCU I/O pin's internal resistance */
NV.RiL = R_MCU_LOW; /* low side */
NV.RiH = R_MCU_HIGH; /* high side */
/* resistance zero offset (PCB, probe leads) */
#ifdef R_MULTIOFFSET
NV.RZero[0] = R_ZERO;
NV.RZero[1] = R_ZERO;
NV.RZero[2] = R_ZERO;
#else
NV.RZero = R_ZERO;
#endif
/* capacitance zero offset (PCB, probe leads) */
#ifdef CAP_MULTIOFFSET
NV.CapZero[0] = C_ZERO;
NV.CapZero[1] = C_ZERO;
NV.CapZero[2] = C_ZERO;
#else
NV.CapZero = C_ZERO;
#endif
NV.RefOffset = UREF_OFFSET; /* offset of internal band-gap reference */
NV.CompOffset = COMPARATOR_OFFSET; /* offset of analog comparator */
NV.Contrast = LCD_CONTRAST; /* display contrast */
#ifdef HW_TOUCH
/* set defaults for touch screen */
Touch.X_Start = 0;
Touch.X_Stop = 0;
Touch.Y_Start = 0;
Touch.Y_Stop = 0;
/* this triggers the touch adjustment at startup */
#endif
}
#ifdef HW_TOUCH
/*
* functions optimized for generic usage
*/
/*
* calculate checksum for adjustment values
*
* requires:
* - pointer to data structure in RAM
* - size of data structure
*
* returns:
* - checksum
*/
uint8_t CheckSum(uint8_t *Data, uint8_t Size)
{
uint8_t Checksum = 0; /* checksum / return value */
uint8_t n = 0; /* counter */
/* we simply add all bytes, besides the checksum */
Size--; /* last byte is checksum */
while (n < Size)
{
Checksum += *Data; /* add byte */
Data++; /* next byte */
n++; /* next byte */
}
/* fix for zero (not updated yet) */
if (Checksum == 0) Checksum++;
return Checksum;
}
/*
* load/save adjustment values from/to EEPROM
*
* requires:
* - pointer to data structure in RAM
* - pointer to data structure in EEPROM
* - size of data structure
* - mode: storage mode
* STORAGE_SAVE - save
* STORAGE_LOAD - load
*
* returns:
* - 0 on checksum error for read operation
* - 1 on success
*/
uint8_t DataStorage(uint8_t *Data_RAM, uint8_t *Data_EE, uint8_t Size, uint8_t Mode)
{
uint8_t Flag = 1; /* return value */
uint8_t Check; /* checksum */
uint8_t *Help; /* pointer to checksum byte */
/* update checksum */
Help = Data_RAM; /* start pointer */
Help += Size - 1; /* last byte (checksum) */
*Help = CheckSum(Data_RAM, Size); /* update checksum */
/*
* read/write EEPROM block-wise to/from data structure in RAM
*/
if (Mode == STORAGE_SAVE) /* write */
{
/* write data block from RAM to EEPROM */
eeprom_write_block(Data_RAM, Data_EE, Size);
}
else /* read */
{
/* read data block from EEPROM to RAM */
eeprom_read_block(Data_RAM, Data_EE, Size);
}
/*
* check checksum on read
*/
if (Mode != STORAGE_SAVE) /* read mode */
{
Check = CheckSum(Data_RAM, Size); /* checksum of data in RAM */
/* data structure's last byte is checksum */
Data_RAM += Size - 1; /* point to last byte */
/* todo: couldn't we simply use Help? */
if (*Data_RAM != 0) /* EEPROM updated */
{
if (*Data_RAM != Check) /* checksum mismatch */
{
/* tell user */
LCD_Clear();
#ifdef UI_CENTER_ALIGN
Display_CenterLine(2); /* center block: 2 lines */
Display_EEString_Center(Checksum_str); /* display: Checksum */
Display_NL_EEString_Center(Error_str); /* display: error! */
#else
Display_EEString(Checksum_str); /* display: Checksum */
Display_NL_EEString(Error_str); /* display: error! */
#endif
MilliSleep(2000); /* give user some time to read */
Flag = 0; /* signal checksum problem */
}
}
}
return Flag;
}
/*
* manage storage of adjustment offsets and values
*
* requires:
* - mode: load/save
* STORAGE_LOAD load data from EEPROM to RAM
* STORAGE_SAVE save data from RAM to EEPROM
* - ID: profile ID (1 or 2) for basic adjustment values
*/
void ManageAdjustmentStorage(uint8_t Mode, uint8_t ID)
{
uint8_t n; /* temp. value */
uint8_t Flag = 1; /* control flag */
uint8_t *Data_EE; /* pointer to EEPROM */
/*
* basic adjustment offsets/values
* - two sets available
*/
/* determine EEPROM address */
if (ID == 2) /* profile #2 */
{
Data_EE = (uint8_t *)&NV_Adjust_2;
}
#ifdef UI_THREE_PROFILES
else if (ID == 3) /* profile #3 */
{
Data_EE = (uint8_t *)&NV_Adjust_3;
}
#endif
else /* profile #1 */
{
Data_EE = (uint8_t *)&NV_Adjust_1;
}
/* write/read EEPROM */
n = DataStorage((uint8_t *)&NV, Data_EE, sizeof(Adjust_Type), Mode);
if (n == 0) Flag = 0; /* checksum error */
/*
* touch screen offsets
*/
/* write/read EEPROM */
n = DataStorage((uint8_t *)&Touch, (uint8_t *)&NV_Touch, sizeof(Touch_Type), Mode);
if (n == 0) Flag = 0; /* checksum error */
if ((Mode == STORAGE_LOAD) && (Flag == 0)) /* checksum error */
{
SetAdjustmentDefaults(); /* set defaults */
}
}
/*
* end of functions optimized for generic usage
*/
#else
/*
* functions optimized for basic adjustment offsets and values
*/
/*
* calculate checksum for adjustment values
*/
uint8_t CheckSum(void)
{
uint8_t Checksum = 0; /* checksum / return value */
uint8_t n; /* counter */
uint8_t *Data = (uint8_t *)&NV; /* pointer to RAM */
/* we simply add all bytes, besides the checksum */
for (n = 0; n < (sizeof(Adjust_Type) - 1); n++)
{
Checksum += *Data; /* add byte */
Data++; /* next byte */
}
/* fix for zero (not updated yet) */
if (Checksum == 0) Checksum++;
return Checksum;
}
/*
* manage storage of adjustment offsets and values
* - save/load values to/from EEPROM
*
* requires:
* - mode: load/save
* STORAGE_LOAD load data from EEPROM to RAM
* STORAGE_SAVE save data from RAM to EEPROM
* - ID: profile ID (1 or 2)
*/
void ManageAdjustmentStorage(uint8_t Mode, uint8_t ID)
{
uint8_t n; /* counter */
uint8_t *Addr_RAM = (uint8_t *)&NV; /* pointer to RAM */
uint8_t *Addr_EE; /* pointer to EEPROM */
/* determine EEPROM address */
if (ID == 2) /* profile #2 */
{
Addr_EE = (uint8_t *)&NV_Adjust_2;
}
#ifdef UI_THREE_PROFILES
else if (ID == 3) /* profile #3 */
{
Addr_EE = (uint8_t *)&NV_Adjust_3;
}
#endif
else /* profile #1 */
{
Addr_EE = (uint8_t *)&NV_Adjust_1;
}
NV.CheckSum = CheckSum(); /* update checksum */
/*
* read/write EEPROM block-wise to/from data structure
*/
if (Mode == STORAGE_SAVE) /* write */
{
/* write data block from RAM to EEPROM */
eeprom_write_block(Addr_RAM, Addr_EE, sizeof(Adjust_Type));
}
else /* read */
{
/* read data block from EEPROM to RAM */
eeprom_read_block(Addr_RAM, Addr_EE, sizeof(Adjust_Type));
}
/*
* check checksum on read
*/
if (Mode != STORAGE_SAVE) /* read mode */
{
n = CheckSum(); /* get checksum */
if (NV.CheckSum != 0) /* EEPROM updated */
{
if (NV.CheckSum != n) /* mismatch */
{
/* tell user */
LCD_Clear();
#ifdef UI_CENTER_ALIGN
Display_CenterLine(2); /* center block: 2 lines */
Display_EEString_Center(Checksum_str); /* display: Checksum */
Display_NL_EEString_Center(Error_str); /* display: error! */
#else
Display_EEString(Checksum_str); /* display: Checksum */
Display_NL_EEString(Error_str); /* display: error! */
#endif
MilliSleep(2000); /* give user some time to read */
SetAdjustmentDefaults(); /* set defaults */
}
}
}
}
/*
* end of functions optimized for basic adjustment offsets and values
*/
#endif
/* ************************************************************************
* self adjustment
* ************************************************************************ */
/*
* show basic adjustment values and offsets
*/
void ShowAdjustmentValues(void)
{
UI.LineMode = LINE_KEY; /* next-line mode: wait for key/timeout */
/* display RiL and RiH (values are in 0.1 Ohms) */
LCD_Clear();
Display_EEString_Space(RiLow_str); /* display: Ri- */
Display_Value(NV.RiL, -1, LCD_CHAR_OMEGA);
Display_NL_EEString_Space(RiHigh_str); /* display: Ri+ */
Display_Value(NV.RiH, -1, LCD_CHAR_OMEGA);
/* display C-Zero (values are in pF) */
Display_NL_EEString_Space(CapOffset_str); /* display: C0 */
#ifdef CAP_MULTIOFFSET
/* show the first two values without unit (assuming pF) */
Display_Value(NV.CapZero[0], 0, 0); /* display C0 offset for probes 1-2 */
Display_Space(); /* display space */
Display_Value(NV.CapZero[1], 0, 0); /* display C0 offset for probes 1-3 */
Display_Space(); /* display space */
Display_Value(NV.CapZero[2], -12, 'F'); /* display C0 offset for probes 2-3 */
#else
Display_Value(NV.CapZero, -12, 'F'); /* display C0 offset */
#endif
/* display R-Zero (values are in 0.01 Ohms) */
Display_NL_EEString_Space(ROffset_str); /* display: R0 */
#ifdef R_MULTIOFFSET
/* show the first two values without unit and split output to 2 lines */
Display_Value(NV.RZero[0], -2, 0); /* display R0 offset for probes 1-2 */
Display_Space(); /* display space */
Display_Value(NV.RZero[1], -2, 0); /* display R0 offset for probes 1-3 */
Display_NextLine();
Display_Space(); /* display space */
Display_Value(NV.RZero[2], -2, LCD_CHAR_OMEGA); /* display R0 offset for probes 2-3 */
#else
Display_Value(NV.RZero, -2, LCD_CHAR_OMEGA); /* display R0 */
#endif
/* display internal bandgap reference (value is in mV) */
Display_NL_EEString_Space(URef_str); /* display: Vref */
Display_Value(Cfg.Bandgap, -3, 'V'); /* display bandgap ref */
/* display Vcc (value is in mV) */
Display_NL_EEString_Space(Vcc_str); /* display: Vcc */
Display_Value(Cfg.Vcc, -3, 'V'); /* display Vcc */
#ifdef HW_REF25
/* show if external voltage reference is used */
if (Cfg.OP_Mode & OP_EXT_REF) /* external 2.5V reference used */
{
Display_Space(); /* display space */
Display_Char('*'); /* display: * */
}
#endif
/* display offset of analog comparator (value is in mV) */
Display_NL_EEString_Space(CompOffset_str); /* display: AComp */
Display_SignedValue(NV.CompOffset, -3, 'V'); /* display offset */
WaitKey(); /* let the user read */
}
/*
* self adjustment
*
* returns:
* - 0 on error
* - 1 on success
*/
uint8_t SelfAdjustment(void)
{
uint8_t Flag = 0; /* return value & loop couner */
uint8_t Step; /* step counter */
uint8_t DisplayFlag; /* display flag */
uint16_t Val1 = 0; /* voltage/value #1 */
uint16_t Val2 = 0; /* voltage/value #2 */
uint16_t Val3 = 0; /* voltage/value #3 */
uint8_t CapCounter = 0; /* number of C_Zero measurements */
#ifdef CAP_MULTIOFFSET
uint16_t CapSum1 = 0; /* sum of C_Zero values for probes 12 */
uint16_t CapSum2 = 0; /* sum of C_Zero values for probes 13 */
uint16_t CapSum3 = 0; /* sum of C_Zero values for probes 23 */
#else
uint16_t CapSum = 0; /* sum of C_Zero values */
#endif
uint8_t RCounter = 0; /* number of R_Zero measurements */
#ifdef R_MULTIOFFSET
uint16_t RSum1 = 0; /* sum of R_Zero values for probes 12 */
uint16_t RSum2 = 0; /* sum of R_Zero values for probes 13 */
uint16_t RSum3 = 0; /* sum of R_Zero values for probes 23 */
#else
uint16_t RSum = 0; /* sum of R_Zero values */
#endif
uint8_t RiL_Counter = 0; /* number of U_RiL measurements */
uint16_t U_RiL = 0; /* sum of U_RiL values */
uint8_t RiH_Counter = 0; /* number of U_RiH measurements */
uint16_t U_RiH = 0; /* sum of U_RiL values */
uint32_t Val0; /* temp. value */
#ifdef HW_ADJUST_CAP
uint8_t RefCounter = 0; /* number of ref/offset runs */
#endif
#ifdef HW_ADJUST_CAP
Step = 1; /* start with step #1 */
#else
Step = 2; /* start with step #2 */
#endif
/*
* measurements
*/
/* make sure all probes are shorted */
Flag = ShortCircuit(1);
if (Flag == 0) /* aborted */
{
Step = 10; /* skip adjustment */
}
while (Step <= 6) /* loop through steps */
{
Flag = 1; /* reset loop counter */
/* repeat each measurement 5 times */
while (Flag <= 5)
{
/* display step number */
LCD_Clear();
#ifdef UI_COLORED_TITLES
Display_UseTitleColor(); /* use title color */
#endif
Display_Char('A'); /* display: A (for Adjust) */
Display_Char('0' + Step); /* display number */
#ifdef UI_COLORED_TITLES
Display_UseOldColor(); /* use old color */
#endif
Display_Space();
DisplayFlag = 1; /* display values by default */
/*
* adjustment steps
*/
switch (Step)
{
#ifdef HW_ADJUST_CAP
case 1: /* voltage offsets */
Display_EEString_Space(URef_str); /* display: Vref */
Display_EEString(CompOffset_str); /* display: AComp */
RefCounter += RefCap(); /* use fixed cap */
Display_NextLine();
Display_SignedValue(NV.RefOffset, -3, 'V'); /* display offset in mV */
Display_Space();
Display_SignedValue(NV.CompOffset, -3, 'V'); /* display offset in mV */
DisplayFlag = 0; /* reset flag */
break;
#endif
case 2: /* resistance of probe leads (probes shorted) */
Display_EEString_Space(ROffset_str); /* display: R0 */
Display_EEString(ProbeComb_str); /* display: 12 13 23 */
/*
* The resistance is for two probes in series and we expect it to be
* lower than 1.50 Ohms, i.e. 0.75 Ohms for a single probe.
*/
/* probe pair 1-2 */
UpdateProbes2(PROBE_2, PROBE_1); /* update probes (#2 and #1) */
Val1 = SmallResistor(0); /* get R in 0.01 Ohm */
if (Val1 < 150) /* within limit (< 1.5 Ohm) */
{
#ifdef R_MULTIOFFSET
RSum1 += Val1; /* add R to probe pair sum */
#else
RSum += Val1; /* add R to total sum */
#endif
RCounter++; /* valid measurement */
}
/* probe pair 1-3 */
UpdateProbes2(PROBE_3, PROBE_1); /* update probes (#3 and #1) */
Val2 = SmallResistor(0); /* get R in 0.01 Ohm */
if (Val2 < 150) /* within limit (< 1.5 Ohm) */
{
#ifdef R_MULTIOFFSET
RSum2 += Val2; /* add R to probe pair sum */
#else
RSum += Val2; /* add R to total sum */
#endif
RCounter++; /* valid measurement */
}
/* probe pair 2-3 */
UpdateProbes2(PROBE_3, PROBE_2); /* update probes (#3 and #2) */
Val3 = SmallResistor(0); /* get R in 0.01 Ohm */
if (Val3 < 150) /* within limit (< 1.5 Ohm) */
{
#ifdef R_MULTIOFFSET
RSum3 += Val3; /* add R to probe pair sum */
#else
RSum += Val3; /* add R to total sum */
#endif
RCounter++; /* valid measurement */
}
break;
case 3: /* un-short probes */
ShortCircuit(0); /* make sure probes are not shorted */
Flag = 100; /* skip test */
DisplayFlag = 0; /* don't display any result */
break;
case 4: /* internal resistance of MCU pin in pull-down mode */
Display_EEString(RiLow_str); /* display: Ri- */
/* TP1: Gnd -- RiL -- probe-1 -- Rl -- RiH -- Vcc */
ADC_PORT = 0;
ADC_DDR = (1 << TP1);
R_PORT = (1 << R_RL_1);
R_DDR = (1 << R_RL_1);
Val1 = ReadU_5ms(TP1); /* U across RiL */
U_RiL += Val1; /* add U to total sum */
/* TP2: Gnd -- RiL -- probe-2 -- Rl -- RiH -- Vcc */
ADC_DDR = (1 << TP2);
R_PORT = (1 << R_RL_2);
R_DDR = (1 << R_RL_2);
Val2 = ReadU_5ms(TP2); /* U across RiL */
U_RiL += Val2; /* add U to total sum */
/* TP3: Gnd -- RiL -- probe-3 -- Rl -- RiH -- Vcc */
ADC_DDR = (1 << TP3);
R_PORT = (1 << R_RL_3);
R_DDR = (1 << R_RL_3);
Val3 = ReadU_5ms(TP3); /* U across RiL */
U_RiL += Val3; /* add U to total sum */
RiL_Counter += 3;
break;
case 5: /* internal resistance of MCU pin in pull-up mode */
Display_EEString(RiHigh_str); /* display: Ri+ */
/* TP1: Gnd -- RiL -- Rl -- probe-1 -- RiH -- Vcc */
R_PORT = 0;
ADC_PORT = (1 << TP1);
ADC_DDR = (1 << TP1);
R_DDR = (1 << R_RL_1);
Val1 = Cfg.Vcc - ReadU_5ms(TP1); /* U across RiH */
U_RiH += Val1; /* add U to total sum */
/* TP2: Gnd -- RiL -- Rl -- probe-2 -- RiH -- Vcc */
ADC_PORT = (1 << TP2);
ADC_DDR = (1 << TP2);
R_DDR = (1 << R_RL_2);
Val2 = Cfg.Vcc - ReadU_5ms(TP2); /* U across RiH */
U_RiH += Val2; /* add U to total sum */
/* TP3: Gnd -- RiL -- Rl -- probe-3 -- RiH -- Vcc */
ADC_PORT = (1 << TP3);
ADC_DDR = (1 << TP3);
R_DDR = (1 << R_RL_3);
Val3 = Cfg.Vcc - ReadU_5ms(TP3); /* U across RiH */
U_RiH += Val3; /* add U to total sum */
RiH_Counter += 3;
break;
case 6: /* capacitance offset (PCB and probe leads) */
Display_EEString_Space(CapOffset_str); /* display: C0 */
Display_EEString(ProbeComb_str); /* display: 12 13 23 */
/*
* measure the probe pair capacitance
* - take raw capacitance value (no offset considered)
* - we expect a value less than 100pF
*/
/* probe pair 1-2 */
MeasureCap(PROBE_2, PROBE_1, 0); /* measure C */
/* limit offset to 100pF */
if ((Caps[0].Scale == -12) && (Caps[0].Raw <= 100UL))
{
Val1 = (uint16_t)Caps[0].Raw; /* get C (in pF) */
#ifdef CAP_MULTIOFFSET
CapSum1 += Val1; /* add C to probe pair sum */
#else
CapSum += Val1; /* add C to total sum */
#endif
CapCounter++; /* valid measurement */
}
/* probe pair 1-3 */
MeasureCap(PROBE_3, PROBE_1, 1); /* measure C */
/* limit offset to 100pF */
if ((Caps[1].Scale == -12) && (Caps[1].Raw <= 100UL))
{
Val2 = (uint16_t)Caps[1].Raw; /* get C (in pF) */
#ifdef CAP_MULTIOFFSET
CapSum2 += Val2; /* add C to probe pair sum */
#else
CapSum += Val2; /* add C to total sum */
#endif
CapCounter++; /* valid measurement */
}
/* probe pair 2-3 */
MeasureCap(PROBE_3, PROBE_2, 2); /* measure C */
/* limit offset to 100pF */
if ((Caps[2].Scale == -12) && (Caps[2].Raw <= 100UL))
{
Val3 = (uint16_t)Caps[2].Raw; /* get C (in pF) */
#ifdef CAP_MULTIOFFSET
CapSum3 += Val3; /* add C to probe pair sum */
#else
CapSum += Val3; /* add C to total sum */
#endif
CapCounter++; /* valid measurement */
}
break;
}
/* reset ports to defaults */
ADC_DDR = 0; /* input mode */
ADC_PORT = 0; /* all pins low */
R_DDR = 0; /* input mode */
R_PORT = 0; /* all pins low */
/* display values */
if (DisplayFlag)
{
Display_NextLine(); /* move to line #2 */
Display_Value(Val1, 0 , 0); /* display value probe-1 */
Display_Space();
Display_Value(Val2, 0 , 0); /* display value probe-2 */
Display_Space();
Display_Value(Val3, 0 , 0); /* display value probe-3 */
}
/* wait and check test push button */
if (Flag < 100) /* when we don't skip this test */
{
/* catch key press or timeout */
DisplayFlag = TestKey(1000, CHECK_BAT);
/* short press -> next test / long press -> end selftest */
if (DisplayFlag > KEY_TIMEOUT)
{
Flag = 100; /* skip current test anyway */
if (DisplayFlag == KEY_LONG) Step = 100; /* also skip selftest */
}
}
Flag++; /* next run */
}
Step++; /* next step */
}
/*
* calculate values and offsets
*/
Flag = 0; /* reset adjustment counter */
/* capacitance auto-zero: calculate average value for probe pairs */
if (CapCounter == 15)
{
#ifdef CAP_MULTIOFFSET
/* separately for each probe pair (in pF) */
NV.CapZero[0] = CapSum1 / 5; /* probes 1-2 */
NV.CapZero[1] = CapSum2 / 5; /* probes 1-3 */
NV.CapZero[2] = CapSum3 / 5; /* probes 2-3 */
#else
/* for all probe pairs (in pF) */
NV.CapZero = CapSum / CapCounter;
#endif
Flag++; /* adjustment done */
}
/* resistance auto-zero: calculate average value for probe pairs */
if (RCounter == 15)
{
#ifdef R_MULTIOFFSET
/* separately for each probe pair (in 0.01 Ohms) */
NV.RZero[0] = RSum1 / 5; /* probes 1-2 */
NV.RZero[1] = RSum2 / 5; /* probes 1-3 */
NV.RZero[2] = RSum3 / 5; /* probes 2-3 */
#else
/* for all probe pairs (in 0.01 Ohms) */
NV.RZero = RSum / RCounter;
#endif
Flag++; /* adjustment done */
}
/* RiL & RiH */
if ((RiL_Counter == 15) && (RiH_Counter == 15))
{
/*
* Calculate RiL and RiH using the voltage divider equation:
* Ri = Rl * (U_Ri / U_Rl)
* - scale up by 100, round up/down and scale down by 10
*/
/* use values multiplied by 3 to increase accuracy */
U_RiL /= 5; /* average sum of 3 U_RiL */
U_RiH /= 5; /* average sum of 3 U_RiH */
Val1 = (Cfg.Vcc * 3) - U_RiL - U_RiH; /* U_Rl * 3 */
/* RiL */
Val0 = ((uint32_t)R_LOW * 100 * U_RiL) / Val1; /* Rl * U_Ri / U_Rl in 0.01 Ohm */
Val0 += 5; /* for automagic rounding */
Val0 /= 10; /* scale down to 0.1 Ohm */
if (Val0 < 250UL) /* < 25 Ohms */
{
NV.RiL = (uint16_t)Val0;
Flag++; /* adjustment done */
}
/* RiH */
Val0 = ((uint32_t)R_LOW * 100 * U_RiH) / Val1; /* Rl * U_Ri / U_Rl in 0.01 Ohm */
Val0 += 5; /* for automagic rounding */
Val0 /= 10; /* scale down to 0.1 Ohm */
if (Val0 < 280UL) /* < 29 Ohms */
{
NV.RiH = (uint16_t)Val0;
Flag++; /* adjustment done */
}
}
#ifdef HW_ADJUST_CAP
if (RefCounter != 5) /* we expect 5 successful runs */
{
Flag = 0; /* signal error */
}
#endif
if (Flag == 4) /* all adjustments done */
{
/* show basic values and offsets */
ShowAdjustmentValues();
Flag = 1; /* signal success */
}
else /* missing adjustments */
{
Flag = 0; /* signal error */
}
return Flag;
}
/* ************************************************************************
* selftest
* ************************************************************************ */
/*
* selftest
* - perform measurements on internal voltages and probe resistors
* - display results
*
* returns:
* - 0 on error
* - 1 on success
*/
uint8_t SelfTest(void)
{
uint8_t Flag = 0; /* return value & loop counter */
uint8_t Test = 1; /* test counter */
uint8_t DisplayFlag; /* display flag */
uint16_t Val0; /* voltage/value */
int16_t Val1 = 0, Val2 = 0, Val3 = 0; /* voltages/values */
int16_t Temp; /* value */
/* make sure all probes are shorted */
Flag = ShortCircuit(1);
if (Flag == 0) /* aborted */
{
Test = 10; /* skip selftest */
}
/* loop through all tests */
while (Test <= 6)
{
Flag = 1; /* reset loop counter */
/* repeat each test 5 times */
while (Flag <= 5)
{
/* display test number */
LCD_Clear();
#ifdef UI_COLORED_TITLES
Display_UseTitleColor(); /* use title color */
#endif
Display_Char('T'); /* display: T */
Display_Char('0' + Test); /* display test number */
#ifdef UI_COLORED_TITLES
Display_UseOldColor(); /* use old color */
#endif
Display_Space();
DisplayFlag = 1; /* display values by default */
/*
* tests
*/
switch (Test)
{
case 1: /* reference voltage */
Val0 = ReadU(ADC_CHAN_BANDGAP); /* dummy read for bandgap stabilization */
Val0 = ReadU(ADC_CHAN_BANDGAP); /* read bandgap reference voltage */
Display_EEString(URef_str); /* display: Vref */
Display_NextLine();
Display_Value(Val0, -3, 'V'); /* display voltage in mV */
DisplayFlag = 0; /* reset flag */
break;
case 2: /* compare Rl resistors (probes still shorted) */
Display_EEString_Space(Rl_str); /* display: +Rl- */
Display_EEString(ProbeComb_str); /* display: 12 13 23 */
/* set up a voltage divider using two Rl */
/* get offset by substracting theoretical voltage of voltage divider */
/* voltage of voltage divider (in mV) */
Temp = ((int32_t)Cfg.Vcc * (R_MCU_LOW/10 + R_LOW)) / (R_MCU_LOW/10 + R_LOW + R_LOW + R_MCU_HIGH/10);
/* TP3: Gnd -- Rl -- probe-2 -- probe-1 -- Rl -- Vcc */