Documentation for “Zerocat Chipflasher” as of Wed, 01 Jan 2025 22:07:31 +0100
Repository:
Version: v2.1.0-0-850cd7bce
Branch: master
Propeller Spin/PASM Compiler 'OpenSpin' (c)2012-2016 Parallax Inc. DBA Parallax Semiconductor.
Version 1.00.78
Compiling...
../../firmware2/src/ADC-monitor.spin
|-pins.spin
Done.
Program size is 1136 bytes
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Zerocat Chipflasher --- Flash free firmware, kick the Management Engine.
Copyright (C) 2020, 2021, 2022 Kai Mertens
File ADC-monitor.spin --- Watch sigma-delta analog to digital conversion.
This file is part of Zerocat Chipflasher.
See end of file for terms of use.
******************************************************************************
# Interface Description
Object "../../firmware2/src/ADC-monitor" Interface:
PUB go(vboard, pin_crit, pin_alert, pin_good)
PUB get_range :
PUB get_result :
PUB get_flag_good :
PUB get_flag_alert :
PUB get_flag_critical :
PUB critical(ctrl)
PUB alert(ctrl)
PUB good(ctrl)
PUB get_result_critical :
PUB get_result_alert :
PUB get_result_good :
Program: 280 Longs
Variable: 11 Longs
# Loaded Objects
* Load pin configuration object.
# Constants
* Monitor Settings for Vcc_SPI @ ADC_IN
Nominal Voltage is needed for internal calculations.
MV_VCC --- Vcc value in Millivolts
Once SPI bus power is suspended,
turn back and resume when a good level is established again.
MV_GOOD --- low limit in Millivolts for good
Driving an SPI chip should be done within specs,
that is with 2.7 to 3.3 Volts.
MV_ALERT --- low limit in Millivolts for alert
Flashing a ThinkPad T60/MX still works fine around 2350mV.
Let us set this voltage as critical limit.
Update: Readout without Vcc_SPI suspend fails on T60/MX25L1605D,
letM-bM-^@M-^?s rise critical threshold to err out after a while.
MV_CRITICAL --- low limit in Millivolts for critical
* ADC Settings
ADC_IN --- counter input pin for sigma-delta ADC
ADC_OUT --- counter feedback pin for sigma-delta ADC
ADC_CALIB --- calibration pin, providing 0V and Vcc
ADC_STARTTIME --- initial time over which to accumulate counts, power-of-two
ADC_RANGEINIT --- initial range
ADC_CHARGETIME --- allow caps to charge/discharge
# Globals
* stack[] --- provide shared memory
# Functions
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PUB go(vboard, pin_crit, pin_alert, pin_good)
Launch PASM code into new cog: MonitorADC_PASM
Pin pin_crit will be switched on if ADC result trips below limiting
critical value. Set pin_crit to TRUE if no pin in use.
Pin pin_alert will be switched on if ADC result trips below limiting
alert value. Set pin_alert to TRUE if no pin in use.
Pin pin_good will be switched off if ADC result trips below limiting
good value. Set pin_good to TRUE if no pin in use.
On startup, driving the pins is disabled.
Drivers are to set explicitly via critical(), alert() and good()
_________________
PUB get_range :
Get range value.
__________________
PUB get_result :
Get calibrated ADC result.
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PUB get_flag_good :
Get value of flag_good, TRUE or FALSE.
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PUB get_flag_alert :
Get value of flag_alert, TRUE or FALSE.
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PUB get_flag_critical :
Get value of flag_crit, TRUE or FALSE.
TRUE requires immediate action!
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PUB critical(ctrl)
Enable (TRUE) or disable (FALSE) pin_crit driver.
FALSE will set the pin tristate.
________________
PUB alert(ctrl)
Enable (TRUE) or disable (FALSE) pin_alert driver.
FALSE will set the pin tristate.
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PUB good(ctrl)
Enable (TRUE) or disable (FALSE) pin_good driver.
FALSE will set the pin tristate.
___________________________
PUB get_result_critical :
Get value of limiting ADC value for critical action.
________________________
PUB get_result_alert :
Get limiting ADC value for alert action.
_______________________
PUB get_result_good :
Get limiting ADC value for good action.
# Data
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MonitorADC_PASM --- PASM code entry
This code is inspired by Parallax Manuals and Application Notes:
* AN001-P8X32ACounters-v2.0.pdf: figure 14
* AN008-SigmaDeltaADC-v1.0.pdf: figure 6, listing2
* P8X32A-Web-PropellerManual-v1.2.pdf: Math Samples
Parameter:
* stack[10] --- calculated, limiting ADC value for good
* stack[9] --- calculated, limiting ADC value for alert
* stack[8] --- calculated, limiting ADC value for critical
* stack[7] --- calculated range value
* stack[6] --- value of flags, TRUE or FALSE
* stack[5] --- control pin_good, direction register value
* stack[4] --- control pin_alert, direction register value
* stack[3] --- control pin_crit, direction register value
* stack[2] --- pin_good
* stack[1] --- pin_alert
* stack[0] --- pin_crit / calibrated result
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adc --- get raw ADC value
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caps --- Wait for t_charge to pass, allow capacitors to charge/discharge
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crit_enable --- update output latch, enable direction register
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crit_disable --- clear direction register, set pin tristate
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alert_enable --- update output latch, enable direction register
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alert_disable --- clear direction register, set pin tristate
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good_enable --- update output latch, enable direction register
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good_disable --- clear direction register, set pin tristate
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Multiply
* multiplies x[15..0] by y[15..0]
* y[31..16] must be zero
* returns product in y[31..0]
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Divide
* divides x[31..0] by y[15..0]
* y[16] must be zero
* returns quotient in x[15..0]
* returns remainder in x[31..16]
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Named registers, initialized
mask_ADC_OUT
mask_ADC_CALIB
mask_quot
range --- intended ADC range, will be trimmed during calibration
t_start --- initial acquisition time, power-of-two
t_charge
val_VCC
val_mv_crit
val_mv_alert
val_mv_good
val_true
val_false
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Named registers, reserved space, not initialized
p_stack --- stack base address
p --- pointer into stack
p_result --- will point to stack[0], calibrated ADC result
p_pin_crit --- will point to stack[0], critical pin
p_pin_alert --- will point to stack[1], alert pin
p_pin_good --- will point to stack[2], good pin
p_pinctrl_crit --- pointer into stack, will point to stack[2], direction value for critical pin
p_pinctrl_alert --- pointer into stack, will point to stack[3], direction value for alert pin
p_pinctrl_good --- pointer into stack, will point to stack[4], direction value for good pin
p_flags --- pointer into stack, will point to stack[5]
p_range --- pointer into stack, will point to stack[6]
p_result_crit --- pointer into stack, will point to stack[7]
p_result_alert --- pointer into stack, will point to stack[8]
p_result_good --- pointer into stack, will point to stack[9]
t_next --- time variable, used for waitcnt
t_delta --- delta acquisition time, used during calibration
t_acquisition --- acquisition time, trimmed during calibration
acc --- general-purpose register
lowpoint --- ADC raw value for low endpoint
result_crit --- trigger value for critical flag
result_alert --- trigger value for alert pin
result_good --- trigger value for alert pin
x --- used by math operations / general-purpose register
y --- used by math operations
bits --- used by math operations
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Terms of Use:
Zerocat Chipflasher is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Zerocat Chipflasher is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with Zerocat Chipflasher. If not, see <http://www.gnu.org/licenses/>.
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