This module enables you to time events in milliseconds using Timer1. It is the module written by Jeremy Leach but I've amended it to work on the 28X2.
This is the output:
Paused = 50ms. Measured = 51ms.
Paused = 60ms. Measured = 61ms.
Paused = 70ms. Measured = 71ms.
Paused = 80ms. Measured = 81ms.
Paused = 90ms. Measured = 91ms.
Paused = 100ms. Measured = 101ms.
Paused = 110ms. Measured = 111ms.
Paused = 120ms. Measured = 121ms.
Paused = 130ms. Measured = 131ms.
Paused = 140ms. Measured = 141ms.
Paused = 150ms. Measured = 151ms.
Paused = 160ms. Measured = 161ms.
Paused = 170ms. Measured = 171ms.
Paused = 180ms. Measured = 181ms.
Paused = 190ms. Measured = 191ms.
Paused = 200ms. Measured = 201ms.
Paused = 210ms. Measured = 211ms.
Paused = 220ms. Measured = 220ms.
Paused = 230ms. Measured = 230ms.
Paused = 240ms. Measured = 240ms.
Paused = 250ms. Measured = 250ms.
Paused = 260ms. Measured = 260ms.
Paused = 270ms. Measured = 270ms.
Paused = 280ms. Measured = 280ms.
Paused = 290ms. Measured = 290ms.
Paused = 300ms. Measured = 300ms.
Paused = 310ms. Measured = 310ms.
Paused = 320ms. Measured = 320ms.
Paused = 330ms. Measured = 330ms.
Paused = 340ms. Measured = 340ms.
Paused = 350ms. Measured = 350ms.
Paused = 360ms. Measured = 360ms.
Paused = 370ms. Measured = 370ms.
Paused = 380ms. Measured = 380ms.
Paused = 390ms. Measured = 389ms.
Paused = 400ms. Measured = 399ms.
Paused = 410ms. Measured = 409ms.
Paused = 420ms. Measured = 419ms.
Paused = 430ms. Measured = 429ms.
Paused = 440ms. Measured = 439ms.
Paused = 450ms. Measured = 449ms.
Paused = 460ms. Measured = 459ms.
Paused = 470ms. Measured = 469ms.
Paused = 480ms. Measured = 479ms.
Paused = 490ms. Measured = 489ms.
Paused = 500ms. Measured = 499ms.
Paused = 510ms. Measured = 509ms.
Paused = 520ms. Measured = 519ms.
Code:
#PICAXE 28X2
#rem
#
#######################################################
# TIMER1 test code #
#######################################################
#endrem
; Timer1 result
symbol Timer1ValueW = W1
symbol Timer1ValueL = b2
symbol Timer1ValueH = b3
; Variables for test
symbol TimePeriod = W2
Initialise:
SetFreq M8
gosub InitialiseTimer1
Main:
for TimePeriod = 0 to 520 step 10 ; in milliseconds
; Reset Timer1
gosub ResetAndStartTimer1
; Simulate a delay due to a block of code executing...
pause TimePeriod
; Get the elapsed time
gosub GetTime
; Transmit the results
sertxd (CR,LF, "Paused = ", #TimePeriod, "ms. Measured = ", #Timer1ValueW, "ms.")
next TimePeriod
goto main
end
#rem
#
#######################################################
# TIMER1 'MODULE'. J.Leach December 2006 #
# Modified for 28X2 by jaybeetoo May 2013 #
#######################################################
This module enables you to time events in milliseconds using Timer1.
At 8MHz clock the maximum time that can be meaured is 524ms
These routines have been written following discovery of the detail
by the Happy Hippy.
#endrem
; Registers
symbol SFR_T1CON = $CD ; TIMER1 CONTROL REGISTER
symbol SFR_TMR1H = $CF ; Timer1 high byte
symbol SFR_TMR1L = $CE ; Timer1 low byte
symbol SFR_PIR1 = $9E ; PIR1: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1
; TXCON: TIMER1 CONTROL REGISTER
; bit 7-6 TMRxCS<1:0>: Timer1/3/5 Clock Source Select bits
; 11 =Reserved. Do not use.
; 10 =Timer1/3/5 clock source is pin or oscillator:
; If TxSOSCEN = 0:
; External clock from TxCKI pin (on the rising edge)
; If TxSOSCEN = 1:
; Crystal oscillator on SOSCI/SOSCO pins
; 01 =Timer1/3/5 clock source is system clock (FOSC)
; 00 =Timer1/3/5 clock source is instruction clock (FOSC/4)
; bit 5-4 TxCKPS<1:0>: Timer1/3/5 Input Clock Prescale Select bits
; 11 = 1:8 Prescale value
; 10 = 1:4 Prescale value
; 01 = 1:2 Prescale value
; 00 = 1:1 Prescale value
; bit 3 TxSOSCEN: Secondary Oscillator Enable Control bit
; 1 = Dedicated Secondary oscillator circuit enabled
; 0 = Dedicated Secondary oscillator circuit disabled
; bit 2 TxSYNC: Timer1/3/5 External Clock Input Synchronization Control bit
; TMRxCS<1:0> = 1X
; 1 = Do not synchronize external clock input
; 0 = Synchronize external clock input with system clock (FOSC)
;
; TMRxCS<1:0> = 0X
; This bit is ignored. Timer1/3/5 uses the internal clock when TMRxCS<1:0> = 1X.
; bit 1 TxRD16: 16-Bit Read/Write Mode Enable bit
; 1 = Enables register read/write of Timer1/3/5 in one 16-bit operation
; 0 = Enables register read/write of Timer1/3/5 in two 8-bit operation
; bit 0 TMRxON: Timer1/3/5 On bit
; 1 = Enables Timer1/3/5
; 0 = Stops Timer1/3/5
; Clears Timer1/3/5 Gate flip-flop
symbol T1CON = b0
symbol TMR1CS1 = bit7
symbol TMR1CS2 = bit6
symbol T1CKPS1 = bit5
symbol T1CKPS0 = bit4
symbol T1SOSCEN = bit3
symbol T1SYNC = bit2
symbol T1RD16 = bit1
symbol TMR1ON = bit0
; PIR1: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1
; bit 7 Unimplemented: Read as ‘0’.
; bit 6 ADIF: A/D Converter Interrupt Flag bit
; 1 = An A/D conversion completed (must be cleared by software)
; 0 = The A/D conversion is not complete or has not been started
; bit 5 RC1IF: EUSART1 Receive Interrupt Flag bit
; 1 = The EUSART1 receive buffer, RCREG1, is full (cleared when RCREG1 is read)
; 0 = The EUSART1 receive buffer is empty
; bit 4 TX1IF: EUSART1 Transmit Interrupt Flag bit
; 1 = The EUSART1 transmit buffer, TXREG1, is empty (cleared when TXREG1 is written)
; 0 = The EUSART1 transmit buffer is full
; bit 3 SSP1IF: Master Synchronous Serial Port 1 Interrupt Flag bit
; 1 = The transmission/reception is complete (must be cleared by software)
; 0 = Waiting to transmit/receive
; bit 2 CCP1IF: CCP1 Interrupt Flag bit
; Capture mode:
; 1 = A TMR1 register capture occurred (must be cleared by software)
; 0 = No TMR1 register capture occurred
; Compare mode:
; 1 = A TMR1 register compare match occurred (must be cleared by software)
; 0 = No TMR1 register compare match occurred
; PWM mode:
; Unused in this mode
; bit 1 TMR2IF: TMR2 to PR2 Match Interrupt Flag bit
; 1 = TMR2 to PR2 match occurred (must be cleared by software)
; 0 = No TMR2 to PR2 match occurred
; bit 0 TMR1IF: TMR1 Overflow Interrupt Flag bit
; 1 = TMR1 register overflowed (must be cleared by software)
; 0 = TMR1 register did not overflow
symbol PIR1 = b0
symbol TMR1IF = bit0
InitialiseTimer1:
; Sets the TIMER1 control register
TMR1CS1 = 0 ; Timer1 clock source is instruction clock (FOSC/4)
TMR1CS2 = 0 ; Timer1/3/5 clock source is instruction clock (FOSC/4)
T1CKPS1 = 1 ; 1:8 Prescale value
T1CKPS0 = 1 ; 1:8 Prescale value
T1SOSCEN = 0 ; Dedicated Secondary oscillator circuit disabled
T1SYNC = 1 ; Do not synchronize external clock input
T1RD16 = 0 ; Enables register read/write of Timer1 in two 8-bit operation
TMR1ON = 0 ; Stops Timer1
pokeSFR SFR_T1CON, T1CON ; Set TIMER1 control register
return
ResetAndStartTimer1:
; Clear Timer1 and the interrupt (overflow) flag, Start Timer1
; Set Timer1 to 0
pokeSFR SFR_TMR1H, 0
pokeSFR SFR_TMR1L, 0
; Clear Timer 1 overflow interrupt
peekSFR SFR_PIR1, PIR1
TMR1IF = 0
pokeSFR SFR_PIR1, PIR1
; Start Timer1
peekSFR SFR_T1CON, T1CON
TMR1ON = 1 ; Enables Timer1
pokeSFR SFR_T1CON, T1CON
return
GetTime:
; Stop Timer1, load the results into Timer1ValueW and convert it
; to milliseconds (assumes 8MHz clock)
; Stopt Timer1
peekSFR SFR_T1CON, T1CON
TMR1ON = 0 ; Stops Timer1
pokeSFR SFR_T1CON, T1CON
; Get result
peekSFR SFR_TMR1H, Timer1ValueH
peekSFR SFR_TMR1L, Timer1ValueL
; Convert result to milliseconds
Timer1ValueW = Timer1ValueW / 250
; Check for an overflow
peekSFR SFR_PIR1, PIR1
if TMR1IF = 1 then
Timer1ValueW = Timer1ValueW + 262
endif
returnPaused = 50ms. Measured = 51ms.
Paused = 60ms. Measured = 61ms.
Paused = 70ms. Measured = 71ms.
Paused = 80ms. Measured = 81ms.
Paused = 90ms. Measured = 91ms.
Paused = 100ms. Measured = 101ms.
Paused = 110ms. Measured = 111ms.
Paused = 120ms. Measured = 121ms.
Paused = 130ms. Measured = 131ms.
Paused = 140ms. Measured = 141ms.
Paused = 150ms. Measured = 151ms.
Paused = 160ms. Measured = 161ms.
Paused = 170ms. Measured = 171ms.
Paused = 180ms. Measured = 181ms.
Paused = 190ms. Measured = 191ms.
Paused = 200ms. Measured = 201ms.
Paused = 210ms. Measured = 211ms.
Paused = 220ms. Measured = 220ms.
Paused = 230ms. Measured = 230ms.
Paused = 240ms. Measured = 240ms.
Paused = 250ms. Measured = 250ms.
Paused = 260ms. Measured = 260ms.
Paused = 270ms. Measured = 270ms.
Paused = 280ms. Measured = 280ms.
Paused = 290ms. Measured = 290ms.
Paused = 300ms. Measured = 300ms.
Paused = 310ms. Measured = 310ms.
Paused = 320ms. Measured = 320ms.
Paused = 330ms. Measured = 330ms.
Paused = 340ms. Measured = 340ms.
Paused = 350ms. Measured = 350ms.
Paused = 360ms. Measured = 360ms.
Paused = 370ms. Measured = 370ms.
Paused = 380ms. Measured = 380ms.
Paused = 390ms. Measured = 389ms.
Paused = 400ms. Measured = 399ms.
Paused = 410ms. Measured = 409ms.
Paused = 420ms. Measured = 419ms.
Paused = 430ms. Measured = 429ms.
Paused = 440ms. Measured = 439ms.
Paused = 450ms. Measured = 449ms.
Paused = 460ms. Measured = 459ms.
Paused = 470ms. Measured = 469ms.
Paused = 480ms. Measured = 479ms.
Paused = 490ms. Measured = 489ms.
Paused = 500ms. Measured = 499ms.
Paused = 510ms. Measured = 509ms.
Paused = 520ms. Measured = 519ms.