Posted on May 17, 2011 at 11:50 Hi All,
I been banging away at this all day, help me out here while I still have some hair left.
I have read that you would like the code posted so some comment can be made on it.
OK, just remember that you asked.
The routine sticks at C2_LP, it never sees the TI in SCON2 for the second UART
IICSDA is a diag pin (P3.1) that I use to track stuck routines.
The transmit routine uses “RSDAT�? as a charter buffer in the ram to load the sbuf2.
**********************************************************
C2_OUT: mov A,IEA
clr Acc.4 ;Clear the second UART Interrupt enable
mov IEA,A
mov SBUF2,RSDAT
C2_LP: mov A,SCON2
cpl IICSDA
jnb Acc.1,C2_LP
clr Acc.1
mov SCON2,A
mov A,IEA
setb Acc.4 ;Enable the Interrupt enable
mov IEA,A
ret
And the setup routine for all the timers, and “stuff�?
Just remember you asked !
;******************************************************************
;* Timers 0 thru 2 set up
;* Timer 0 ....... tclk
;* Timer 1 ....... RS232 Port 0
;* Timer 2 ....... UART1
;******************************************************************
S_INT: clr TR1
mov TMOD,00100001B ;Timer 1 is set to 8 bit auto reload mode
;Timer 0 used as 16 bit Tic clock
;Reload the tic value on interrupt
mov th1,BaudLoad ; Set reload value
setb tr1 ; start timer for UART 0.
;******************************************************************
;* TCON *
;* bit0 IT0 External Interrupt 0 type H/L state *
;* bit1 IE0 External Interrupt 0 flag *
;* bit2 IT1 External Interrupt 0 type H/L state *
;* bit3 IE1 External Interrupt 0 flag *
;* bit4 TR0 Timer 0 run flag *
;* bit5 TF0 Timer 0 overflow flag *
;* bit6 TR1 Timer 1 run flag *
;* bit7 TF1 Timer 1 overflow flag *
;******************************************************************
mov TCON,01010000B ;Start both timers
;******************************************************************
;* Timer 0 setup and run *
;******************************************************************
mov tl0,ticl ; Set reload value
mov th0,tich ; Set reload value
setb tr0 ; start timer 0.
setb et0 ; set the interrupt enable
;******************************************************************
;* Second UART setup and run *
;******************************************************************
;* PCON *
;* bit0 IDL Active Idle Mode high enable *
;* bit1 PD Power Down high enabled *
;* bit2 TCLK1 Transmit clock flag UART2 *
;* bit3 RCLK1 Receive clock flag UART2 *
;* bit4 ADSFINT Enable ADC Interrupt *
;* bit5 LVREN LVR Disable bit active high *
;* bit6 SMOD1 Double baud rate UART2 *
;* bit7 SMOD Double baud rate UART1 *
;******************************************************************
;* SCON / SCON2 *
;* bit0 RI Receive Interrupt Flag *
;* bit1 TI Transmit Interrupt Flag *
;* bit2 RB8 8th bit received *
;* bit3 TB8 8th bit transmitted *
;* bit4 REN Enable Serial reception, *
;* bit5 SM2 Multi uP addressing enabled *
;* bit6 SM1 UART type used with SM0 *
;* bit7 SM0 UART type used with SM1 *
;******************************************************************
;* SM1 & SM0 S/B ''10'', in binary *
;* SM2 low to disable the multi processor function *
;* REN set to enable port *
;* ignore the 8th bit flags *
;* TI / RI are reset by the IRQ handler *
;******************************************************************
;* Second Interrupt Enable IEA *
;* IEA *
;* bit0 EUSB Enable USB Bus *
;* bit1 EI2C Enable IIC Bus *
;* bit2 NU Not Used *
;* bit3 NU Not Used *
;* bit4 ES2 Enable 2nd Serial reception *
;* bit5 NU Not Used *
;* bit6 NU Not Used *
;* bit7 EDDC Enable DDC Interrupt *
;******************************************************************
MOV SCON, 050h ; Timer 1 : Mode 1 (vari baud) ; and set receive enable
MOV SCON2, 050h ; Timer 2 : Mode 1 (vari baud) ; and set receive enable
SETB TR1 ; Start timer 1
;mov SCON,01010000B ;TI set indicates transmitter ready.
;mov SCON2,01010000B ;TI set indicates transmitter ready.
;mov A,PCON
;setb Acc.2
;setb Acc.3
;mov PCON,A ;Set the uart to run from timer 2
mov PCON,00001100B ;Set the uart to run from timer 2
;mov PCON,00000000B ;Set the uart to run from timer 2
mov TL2,SECUART ; Set reload value
mov TH2,SECUART ; Set reload value
mov RCAP2L,SECUART
mov RCAP2H,SECUART ;Load the 16 bit counter with reload value
mov IEA,00010000B ;Set the 2nd uart interrupt enable
;mov T2CON,00000100b
;mov T2CON,00110100b
mov T2CON,030h
ret
