Re: 16F1847 Usart and I2C
Can you get either one of the functions working independently?
Posting your code may also help.
Re: 16F1847 Usart and I2C
Yep the TX works fine....tried putting the I2C connections on different pins, but no dice.
Re: 16F1847 Usart and I2C
Code as requested....basically it is generating GPS sentence, and using a I2C compass to populate the heading information in the sentence.....it works fine on the 16f877a. Got a problem with space on the gizmo I am building hence the move to a smaller chip.
Include "modedefs.bas"
define OSC 20
DEFINE HSER_TXSTA 24h
DEFINE HSER_BAUD 9600 'Set Baud rate to 9600bps
DEFINE HSER_BITS 8 'Set to 8 bit mode
DEFINE HSER_CLROERR 1 'Clear overflow error automaticallyAFPCON1 = %00000001
APFCON0 = %11110001 'Set RB pins to SCL1 and SDA 1
APFCON1 = 1 ' TX on RB5
B0 var Word ' Temp variable
Heading var Word ' Compass heading
B2 var byte ' Temp variable
DPIN var portb.7 ' I2C data pin RB2 and RB4
CPIN var Portb.6 ' I2C clock pin
APFCON0 = %11110001 'Set RB pins to SCL1 and SDA 1
APFCON1 = 1 ' TX on RB5
p var byte
Dec_lat1 var word
Dec_lat2 var word
S_byte var byte
Dec_long1 var word
Dec_long2 var word
E_byte var byte
variation var byte
UTC var byte
UTC_2 var byte
Dec_off var byte
Course var byte
date_stamp var byte
UTC_A var byte
UTC_2_A var byte
Off_set var byte
Dec_long1_A var byte
Dec_long2_A var byte
Dec_lat1_A var byte
Dec_lat2_A var byte
TracID var word
WPT_array var byte (63)
WPT_array_A var byte (60)
cksum var Byte
cksum1 var byte
' "["
WPT_array[0]="$"
WPT_array[1]="G"
WPT_array[2]="P"
WPT_array[3]="R"
WPT_array[4]="M"
WPT_array[5]="C"
WPT_array[6]=","
WPT_array[7]=UTC DIG 5+"0"
WPT_array[8]=UTC DIG 4+"0"
WPT_array[9]=UTC DIG 3+"0"
WPT_array[10]=UTC DIG 2+"0"
WPT_array[11]=UTC DIG 1+"0"
WPT_array[12]=UTC DIG 0+"0"
WPT_array[13]="."
WPT_array[14]=UTC_2 DIG 2+"0"
WPT_array[15]=UTC_2 DIG 1+"0"
WPT_array[16]=UTC_2 DIG 0+"0"
WPT_array[17]=","
WPT_array[18]="A"
WPT_array[18]=","
WPT_array[20]=Dec_long1 Dig 3+"0"
WPT_array[21]=Dec_long1 Dig 2+"0"
WPT_array[22]=Dec_long1 Dig 1+"0"
WPT_array[23]=Dec_long1 Dig 0+"0"
WPT_array[24]="."
WPT_array[25]=Dec_long2 Dig 3+"0"
WPT_array[26]=Dec_long2 Dig 2+"0"
WPT_array[27]=Dec_long2 Dig 1+"0"
WPT_array[28]=Dec_long2 Dig 0+"0"
WPT_array[29]=","
WPT_array[30]="N"
WPT_array[31]=","
WPT_array[32]=Dec_lat1 Dig 3+"0"
WPT_array[33]=Dec_lat1 Dig 2+"0"
WPT_array[34]=Dec_lat1 Dig 1+"0"
WPT_array[35]=Dec_lat1 Dig 0+"0"
WPT_array[36]="."
WPT_array[37]=Dec_lat2 Dig 3+"0"
WPT_array[38]=Dec_lat2 Dig 2+"0"
WPT_array[39]=Dec_lat2 Dig 1+"0"
WPT_array[40]=Dec_lat2 Dig 0+"0"
WPT_array[41]=","
WPT_array[42]="W"
WPT_array[43]=","
WPT_array[44]=Dec_off Dig 1+"0"
WPT_array[45]=Dec_off Dig 0+"0"
WPT_array[46]="."
WPT_array[47]=Dec_off Dig 0+"0"
WPT_array[48]=","
WPT_array[49]= "0" + heading dig 2
WPT_array[50]= "0" + heading dig 1
WPT_array[51]= "0" + heading dig 0
WPT_array[52]="."
WPT_array[53]=Course Dig 0+"0"
WPT_array[54]=","
WPT_array[55]=date_stamp Dig 1+"0"
WPT_array[56]=date_stamp Dig 0+"0"
WPT_array[57]=","
WPT_array[58]=variation Dig 1+"0"
WPT_array[59]=variation Dig 0+"0"
WPT_array[60]=","
WPT_array[62]="E"
WPT_array[63]="*"
WPT_array_A[0]="$"
WPT_array_A[1]="G"
WPT_array_A[2]="P"
WPT_array_A[3]="G"
WPT_array_A[4]="G"
WPT_array_A[5]="A"
WPT_array_A[6]=","
WPT_array_A[7]=UTC_A DIG 5+"0"
WPT_array_A[8]=UTC_A DIG 4+"0"
WPT_array_A[9]=UTC_A DIG 3+"0"
WPT_array_A[10]=UTC_A DIG 2+"0"
WPT_array_A[11]=UTC_A DIG 1+"0"
WPT_array_A[12]=UTC_A DIG 0+"0"
WPT_array_A[13]="."
WPT_array_A[14]=UTC_2_A DIG 2+"0"
WPT_array_A[15]=UTC_2_A DIG 1+"0"
WPT_array_A[16]=UTC_2_A DIG 0+"0"
WPT_array_A[17]=","
WPT_array_A[18]=Dec_long1_A Dig 3+"0"
WPT_array_A[19]=Dec_long1_A Dig 2+"0"
WPT_array_A[20]=Dec_long1_A Dig 1+"0"
WPT_array_A[21]=Dec_long1_A Dig 0+"0"
WPT_array_A[22]="."
WPT_array_A[23]=Dec_long2_A Dig 3+"0"
WPT_array_A[24]=Dec_long2_A Dig 2+"0"
WPT_array_A[25]=Dec_long2_A Dig 1+"0"
WPT_array_A[26]=Dec_long2_A Dig 0+"0"
WPT_array_A[27]=","
WPT_array_A[28]="N"
WPT_array_A[29]=","
WPT_array_A[30]=Dec_lat1_A Dig 3+"0"
WPT_array_A[31]=Dec_lat1_A Dig 2+"0"
WPT_array_A[32]=Dec_lat1_A Dig 1+"0"
WPT_array_A[33]=Dec_lat1_A Dig 0+"0"
WPT_array_A[34]="."
WPT_array_A[35]=Dec_lat2_A Dig 3+"0"
WPT_array_A[36]=Dec_lat2_A Dig 2+"0"
WPT_array_A[37]=Dec_lat2_A Dig 1+"0"
WPT_array_A[38]=Dec_lat2_A Dig 0+"0"
WPT_array_A[39]=","
WPT_array_A[40]="W"
WPT_array_A[41]=","
WPT_array_A[42]="1"
WPT_array_A[43]=","
WPT_array_A[44]="0"
WPT_array_A[45]="9"
WPT_array_A[46]=","
WPT_array_A[47]="1"
WPT_array_A[48]=","
WPT_array_A[49]=Off_set Dig 0+"0"
WPT_array_A[50]=Off_set Dig 0+"0"
WPT_array_A[51]=Off_set Dig 0+"0"
WPT_array_A[52]=","
WPT_array_A[53]="M"
WPT_array_A[54]=","
WPT_array_A[55]="0"
WPT_array_A[56]=","
WPT_array_A[57]="M"
WPT_array_A[58]=","
WPT_array_A[59]=","
WPT_array_A[60]="*"
pause 1000
cksum=0
p=0
for p = 1 to 63
cksum = cksum^(WPT_array[p])
Next P
p=0
cksum1=0
for p = 1 to 60
cksum1 = cksum1^(WPT_array_A[p])
Next P
Main
I2CREAD DPIN,CPIN,$C0,$C1,[B2] ' Read 2 locations in a row
B0=B2*14
Heading=B0/10
WPT_array[49]= "0" + heading dig 2
WPT_array[50]= "0" + heading dig 1
WPT_array[51]= "0" + heading dig 0
pause 100
Hserout [Str WPT_array\63, HEX Cksum,13,1]
pause 100
hserout [Str WPT_array_A\60, HEX Cksum1,13,10]
pause 100
Goto Main
End
Re: 16F1847 Usart and I2C
Seahound,
Take a look at the table (Table 1) on page 4 of the datasheet.
From what I can see, you can move the RX pin for the USART from RB1 to RB2. The SDA1 for I2C can not be moved, and is on RB1. SCL1 for I2C is on RB4. And TX fro the USART can be moved between RB2 and RB5. So here is how it should fall out:
I2C:
RB1 SDA1
RB4 SCL1
USART
RB2 RX
RB5 TX
So the APFCONx registers should be
APFCON0 = %10000000
APFCON1 = %00000001
and the pin assignments:
DPIN var portb.1 ' I2C data pin
CPIN var Portb.4 ' I2C clock pin
HTH
Re: 16F1847 Usart and I2C
Thanks for the reply. Just tried it and it does not work. May have to try a short bit of code to see if I can display the heading on a LCD using the I2C routine with out all the other stuff. You helped the last time when I could not get the 16F877a working...:)
Re: 16F1847 Usart and I2C
Had to change to SW TX then it works....well sort of. The I2C reads the compass and the data is stored in the array and tehn transmitted....however the OSD compass heading displays garbage (643, 888, 127 random stuff).
Changed the chip set up to
Include "modedefs.bas"
define OSC 20
Define I2C_SLOW 1
APFCON0 = %11100000 'Set RB pins to SCL1 and SDA 1
APFCON1 = 1 ' TX on RB5
CM1CON0 = 0 ' COMPARATORS OFF
CM1CON1 =0
CM2CON0 = 0 ' COMPARATORS OFF
CM2CON1 =0
CPSCON0 = 0 'CAPACTIVE SENSE MODULE OFF
ANSELA = 0 'turn off analog port A
ANSELB = 0 'turn off analog port B
TRISA= %11111111
TRISB= %11111111
