2nd hardware UART

[rocket_troy]

Has anyone here used the 2nd hardware UART on a PIC processor before? Are there any tricks to it? I, for the life of me, can't get the 2nd one working at all. 1st UART works fine, but no joy with the 2nd. Tried both the suggested PBPs defines and doing it manually with register settings suggested in the datasheet. Processor is a PIC18F26K83. Says it's supposed to have 2 (the way I read it)???

Thanks for any tips,

Troy

[richard]

Thanks for any tips,

my tip
it works just fine if you do it properly

[tumbleweed]

You might want to post what you've tried so we can give you some 'tips'

[rocket_troy]

You might want to post what you've tried so we can give you some 'tips'

OSCFRQ = %1000 '64Mhz

Define OSC 64

' Set receive register to receiver enabled
' Set transmit register to transmitter enabled
DEFINE HSER_RXREG PORTC
DEFINE HSER_RXBIT 4
DEFINE HSER_TXREG PORTC
DEFINE HSER_TXBIT 5
DEFINE HSER_BAUD 9600

' Set receive register to receiver enabled
' Set transmit register to transmitter enabled
'DEFINE HSER2_RXREG PORTB
'DEFINE HSER2_RXBIT 3
'DEFINE HSER2_TXREG PORTB
'DEFINE HSER2_TXBIT 0
'DEFINE HSER2_BAUD 9600

'This works
hSerout ["Test",13,10]

'This doesn't
hSerout2 ["Test",13,10]

[rocket_troy]

Apologies, here is the actual code:

OSCFRQ = %1000 '64Mhz

Define OSC 64

PRECISION  CON 8 SYSTEM  '8 byte = 64 bit precision
INCLUDE "N-Bit_Math.pbp"

DEFINE HSER2_RXREG PORTB
DEFINE HSER2_RXBIT 3
DEFINE HSER2_TXREG PORTB
DEFINE HSER2_TXBIT 0
DEFINE HSER2_BAUD 9600

DEFINE HSER_RXREG PORTC
DEFINE HSER_RXBIT 4
DEFINE HSER_TXREG PORTC
DEFINE HSER_TXBIT 5
DEFINE HSER_BAUD 9600
 
ANSELA = %00000000 'Everything Digital
ANSELB = %00000000 'Everything Else Digital
ANSELC = %00000000 'Everything Else Digital

TRISB.0 = 0 
TRISB.3 = 1 
TRISC.4 = 1 
TRISC.5 = 0 

'works
hSerout ["Test",13,10]

'doesn't work
hSerout2 ["Test",13,10]

[robertg]

I'm far from an expert in this space. And haven't used the second USART port on a PIC
But maybe PMD5 register for UART2 isn't being set correctly by picbasic??

bit 5 U2MD: Disable UART2 bit
1 = UART2 module disabled
0 = UART2 module enabled
bit 4 U1MD: Disable UART1 bit
1 = UART1 module disabled
0 = UART1 module enabled

[richard]

you don't appear to have set the portb pins used to digital [anselb =$f6]

or not

mcc sets the involved registers like this to match your settings

TRISB = 0xFE;
ANSELB = 0xF6;
U2RXPPS = 0x0B; //RB3->UART2:RX2;
RB0PPS = 0x16; //RB0->UART2:TX2;
U2P1L = 0x00;
U2P1H = 0x00;
U2P2L = 0x00;
U2P2H = 0x00;
U2P3L = 0x00;
U2P3H = 0x00;
U2CON0 = 0xB0;
U2CON1 = 0x80;
U2CON2 = 0x00;
U2BRGL = 0x82;
U2BRGH = 0x06;
U2FIFO = 0x00;
U2UIR = 0x00;
U2ERRIR = 0x00;
U2ERRIE = 0x00;

[rocket_troy]

I'm guessing this is a reply to my 1st code post which I inadvertently cut the TRIS settings in my (hastily) attempt for reader friendly pruning, but I can assure you every port was set to digital all the time. What's more, the 2nd UART was originally configured to the same pins as the 1st. When my head was too sore from banging against that wall, I switched the 1st UART to those pins and voila, they worked.

Troy

you don't appear to have set the portb pins used to digital [anselb =$f6]

or not

mcc sets the involved registers like this to match your settings

TRISB = 0xFE;
ANSELB = 0xF6;
U2RXPPS = 0x0B; //RB3->UART2:RX2;
RB0PPS = 0x16; //RB0->UART2:TX2;
U2P1L = 0x00;
U2P1H = 0x00;
U2P2L = 0x00;
U2P2H = 0x00;
U2P3L = 0x00;
U2P3H = 0x00;
U2CON0 = 0xB0;
U2CON1 = 0x80;
U2CON2 = 0x00;
U2BRGL = 0x82;
U2BRGH = 0x06;
U2FIFO = 0x00;
U2UIR = 0x00;
U2ERRIR = 0x00;
U2ERRIE = 0x00;

[richard]

mcc suggests different baud-gen figures that what you have used
mcc
U2BRGL = 0x82;
U2BRGH = 0x06;

[rocket_troy]

mcc suggests different baud-gen figures that what you have used
mcc
U2BRGL = 0x82;
U2BRGH = 0x06;

Yes Richard, I realise that *if* I was operating in 9600 baud, but I noted at the top of that register post I was setting everything to 115200 originally and that pruned snippet of the register setting code was copy-&-pasted from my original attempts at getting this to work. Apologies for not updating those values to make them consistent with the previous posts utilising PBP defines for the config. I did have my terminal receiver running on the correct baud for the settings irrespective.

One thing I've noticed since is the Hserout2 statement is hanging/crashing my code.

Sending a character to the U2TXB register directly *does* work - at least at 9600 baud.

Troy