hill_valley1979 wrote:
> Hello everyone,
>
> I am a beginner with the MSP430 and my first application is a
> communication between two MSP430s via UART.
>
> So, I'm not sure if I configured the UART in the right way, or if I
> have set all bits correctly at the right position.
You haven't enabled the UART.
Refer to the data sheet for registers ME1 & ME2 (Module enable). They
have bits for the Tx & Rx for UART0 & 1. Note the bit numbers are
different in each register.
HTH
Stephen
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Tel: +44 1225 868228 || Stephen Bashford (sbashford@sbas...)
Fax: +44 1225 868191 || Software Engineer
Mob: +44 7768 440692 || MPC Data Limited (http://www.mpc-data.co.uk)
Hello everyone,
I am a beginner with the MSP430 and my first application is a
communication between two MSP430s via UART.
The first step I wanted to do is to send a byte.
I connected a oscilloscope to the UTXD0 pin but I can't see the byte,
that should be transmitted.
So, I'm not sure if I configured the UART in the right way, or if I
have set all bits correctly at the right position.
This is my code:
;-------------------------------
#include "msp430x14x.h"
ORG 01100h ;Program Start
RESET mov.w #0A00h,SP ; Initialize 'F149 stackpointer
call #Init_Sys ;
Mainloop nop
jmp Mainloop ; Do nothing
Init_Sys ; Initalize
StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT
bis.b #030h,&P3SEL ; P3.4,5 = USART0 TXD/RXD
bis.b #010h,&P3DIR ; P3.4 = output direction
SetupUART0
clr.b &TXBUF0 ; Clear TXBUF0
mov.b #0D1h,&UCTL0 ; Parity enabled
; Even parity
; 8-bit data
; SWRST enabled
bis.b #010h,&UTCTL0 ; Source ACLK
mov.b #00Dh,&UBR00 ; 32k/2400 - 13.65
mov.b #000h,&UBR10 ; 32k 2400
mov.b #06Bh,&UMCTL0 ; 32k 2400 modulation
bic.b #SWRST,&UCTL0 ; Clear SWRST
bis.b #UTXIE0,&IE1 ; Enable USART0 TX interrupt
bis.b #URXIE0,&IE1 ; Enable USART0 RX interrupt
eint ; General enable interrupts
tx1 bit.b #UTXIFG0,&IFG1 ; USART0 TX buffer ready?
jz tx1 ; Jump is TX buffer not ready
ret ; Return from subroutine
USART_ISR ; Echo back RXed character
TX1 bit.b #UTXIFG0,&IFG1 ; USART0 TX buffer ready?
jz TX1 ; Jump is TX buffer not ready
mov.b &RXBUF0,&TXBUF0 ; TX -> RXed character
reti ;
UART_TRANSMIT
nop
reti
; Interrupt Vectors Used MSP430x13x/14x
ORG 0FFFEh ;
DW RESET ;
ORG 0FFF2h ;
DW UART0RX_VECTOR ; USART0 receive
DW USART_ISR ; USART0 receive
ORG 0FFF0h ;
DW UART_TRANSMIT ; USART0 transmit
end
;-------------------------------
In my view this should run endless, because when I send AAh it is
received and send again...
But I only see a high level on the P3.4/UTXD0 pin after setting
P3.4,5 = USART0 TXD/RXD and no signal.
I hope somebody can help me.
Nice greetings!
Bernhard
