Alberto
- 24th June 2016, 11:08
I having issues in connecting a small oled display purchesed from Adafruit. All the example they have are based on arduino library! The two example code I found in this forum do not work. It is a whole week I am trying to have this little thing to work without any luck. So I decided to check wich is the true address of the device I am wrking on (documentation I found says $3c; $3d ; $78 ; $7A and more) I did check all of them without any luck.
The code below is supposed to be an I2C address scanner but I am lost on how to detect the ACKNOWLEDGMENT of the device any suggestion or advice?
;----[16F88 Hardware Configuration]---------------------------------------------
#IF __PROCESSOR__ = "16F88"
#DEFINE MCU_FOUND 1
#CONFIG
cfg1 = _INTRC_IO ; INTRC oscillator; port I/O function on both RA6/OSC2/CLKO pin and RA7/OSC1/CLKI pin
cfg1&= _WDT_OFF ; WDT disabled
cfg1&= _PWRTE_OFF ; PWRT disabled
cfg1&= _MCLR_ON ; RA5/MCLR/VPP pin function is MCLR
cfg1&= _BODEN_OFF ; BOR disabled
cfg1&= _LVP_OFF ; RB3 is digital I/O, HV on MCLR must be used for programming
cfg1&= _CPD_OFF ; Code protection off
cfg1&= _WRT_PROTECT_OFF ; Write protection off
cfg1&= _DEBUG_OFF ; In-Circuit Debugger disabled, RB6 and RB7 are general purpose I/O pins
cfg1&= _CCP1_RB0 ; CCP1 function on RB0
cfg1&= _CP_OFF ; Code protection off
__CONFIG _CONFIG1, cfg1
cfg2 = _FCMEN_ON ; Fail-Safe Clock Monitor enabled
cfg2&= _IESO_ON ; Internal External Switchover mode enabled
__CONFIG _CONFIG2, cfg2
#ENDCONFIG
#ENDIF
;----[Verify Configs have been specified for Selected Processor]----------------
; Note: Only include this routine once, after all #CONFIG blocks
#IFNDEF MCU_FOUND
#ERROR "No CONFIGs found for [" + __PROCESSOR__ +"]"
#ENDIF
LED var PortB.3
I2C_Dev var byte
SCL var PortA.3 ' I2C Clock PortA.3
SDA var PortA.2 ' I2C Data PortA.2
False con 0
True con 1
Flag_ack var bit
I VAR BYTE
DC var byte
say var byte
DEFINE HSER_RCSTA 90h ' En. s.port & cont receive
DEFINE HSER_TXSTA 20h ' Enable transmit, BRGH = 1
DEFINE HSER_SPBRG 12 ' 9600 Baud @ 32MHz, 0,16%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
'================================================= =============================
Hserout ["System ready"]
For I = 1 to 10
Led = !Led
pause 100
next I
hserout ["Address scannining in progress..."]
for I = $08 to $77 step 2
I2CWrite SDA,SCL,I2C_Dev,[DC]
If Flag_Ack = true then say = I
pause 2000
Led = !Led
Next I
hserout ["Address found = ",dec say]
end
Thank you for the attention
Alberto
The code below is supposed to be an I2C address scanner but I am lost on how to detect the ACKNOWLEDGMENT of the device any suggestion or advice?
;----[16F88 Hardware Configuration]---------------------------------------------
#IF __PROCESSOR__ = "16F88"
#DEFINE MCU_FOUND 1
#CONFIG
cfg1 = _INTRC_IO ; INTRC oscillator; port I/O function on both RA6/OSC2/CLKO pin and RA7/OSC1/CLKI pin
cfg1&= _WDT_OFF ; WDT disabled
cfg1&= _PWRTE_OFF ; PWRT disabled
cfg1&= _MCLR_ON ; RA5/MCLR/VPP pin function is MCLR
cfg1&= _BODEN_OFF ; BOR disabled
cfg1&= _LVP_OFF ; RB3 is digital I/O, HV on MCLR must be used for programming
cfg1&= _CPD_OFF ; Code protection off
cfg1&= _WRT_PROTECT_OFF ; Write protection off
cfg1&= _DEBUG_OFF ; In-Circuit Debugger disabled, RB6 and RB7 are general purpose I/O pins
cfg1&= _CCP1_RB0 ; CCP1 function on RB0
cfg1&= _CP_OFF ; Code protection off
__CONFIG _CONFIG1, cfg1
cfg2 = _FCMEN_ON ; Fail-Safe Clock Monitor enabled
cfg2&= _IESO_ON ; Internal External Switchover mode enabled
__CONFIG _CONFIG2, cfg2
#ENDCONFIG
#ENDIF
;----[Verify Configs have been specified for Selected Processor]----------------
; Note: Only include this routine once, after all #CONFIG blocks
#IFNDEF MCU_FOUND
#ERROR "No CONFIGs found for [" + __PROCESSOR__ +"]"
#ENDIF
LED var PortB.3
I2C_Dev var byte
SCL var PortA.3 ' I2C Clock PortA.3
SDA var PortA.2 ' I2C Data PortA.2
False con 0
True con 1
Flag_ack var bit
I VAR BYTE
DC var byte
say var byte
DEFINE HSER_RCSTA 90h ' En. s.port & cont receive
DEFINE HSER_TXSTA 20h ' Enable transmit, BRGH = 1
DEFINE HSER_SPBRG 12 ' 9600 Baud @ 32MHz, 0,16%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
'================================================= =============================
Hserout ["System ready"]
For I = 1 to 10
Led = !Led
pause 100
next I
hserout ["Address scannining in progress..."]
for I = $08 to $77 step 2
I2CWrite SDA,SCL,I2C_Dev,[DC]
If Flag_Ack = true then say = I
pause 2000
Led = !Led
Next I
hserout ["Address found = ",dec say]
end
Thank you for the attention
Alberto