MSP430G2553/LaunchPad UART RX example

[turd 31]

Just a simple UART RX example

Don't forget this.

 

#include 
#include 
//#include 
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;					//Stop WDT

P1DIR |= (BIT0 | BIT6);						//Set P1.0 and P1.6 to outputs

BCSCTL1 = CALBC1_1MHZ;						//Set DCO to 1MHz
DCOCTL = CALDCO_1MHZ;
P1SEL = BIT1 + BIT2;						//Set P1.1 and P1.2 to RX to TX
P1SEL2 = BIT1 + BIT2;
UCA0CTL1 |= UCSSEL_2;						//SMCLK
UCA0BR0 = 104;								//9600
UCA0BR1 = 0;								//9600
UCA0MCTL = UCBRS_1;							//Modulation
UCA0CTL1 &= ~UCSWRST;						//Start USCI
IE2 |= UCA0RXIE;							//Enable RX interrupt

__bis_SR_register(CPUOFF + GIE);			//Enter LPM0 with interrupts
}

//#pragma vector=USCIAB0RX_VECTOR
//__interrupt void USCI0RX_ISR(void)
interrupt(USCIAB0RX_VECTOR) USCI0RX_ISR(void)
{
if(UCA0RXBUF == 65)							//Toggle red LED if "A" RXed
{
	P1OUT ^= BIT0;
}

if(UCA0RXBUF == 66)							//Toggle green LED if "B" RXed
{
	P1OUT ^= BIT6;
}
}

[turd 31]

Here's a simple FreeBASIC program to toggle the LEDs:

locate 1, 1: print "connecting..."
shell "stty -F /dev/ttyACM0 speed 9600"
sleep 1000
cls

if open com( "/dev/ttyACM0:9600,n,8,1,cs0,cd0,ds0,rs" as #1 ) <> 0 then
locate 1, 1
print "Unable to open com port"
end
else
sleep 1000
locate 1, 1: print "connected     "
end if


do while inkey$ = ""
print #1, "A";
sleep 1000
print #1, "B";
sleep 1000
loop

close #1

Change "/dev/ttyACM0" to "COM1" for Windows, and remove "shell "stty -F /dev/ttyACM0 speed 9600"".

[larsie 121]

Can you use FreeBASIC on Launchpad? How do you do it?

[Vitos 1]

Can you use FreeBASIC on Launchpad? How do you do it?

 

- It's an example algorithm for PC side of connection. It toggles LEDs by sending appropriate char through UART to the Launchpad.

[turd 31]

Can you use FreeBASIC on Launchpad? How do you do it?

 

- It's an example algorithm for PC side of connection. It toggles LEDs by sending appropriate char through UART to the Launchpad.

Vitos is right. I should have been more clear.

[larsie 121]

OK, I understand

[kiranvarma 0]

Your is simple and working! I have exchange the pins of TXD and RXd as you said

Thank  you.

[krishnak 0]

Hi

 

I have a Reversion 1.5 of MSP EXP430G2 board which apparently doesn't need the cross over's for hardware UART. I have the jumpers turned over for HW uart

 

I have compiled your code in ubuntu and transferred it to the board. 

 

Both the LED's RED and GREEN light up as soon as the board is powered ON.

 

I connect using minicom with the following code

minicom -b 9600 -D /dev/ttyACM0

 

As soon as the minicom connection is established the RED led switches off. Green stays ON

 

But when I press a or b or any other key nothing happens to the led on the boards.

 

When I quit minicom, both RED and GREEN are lit.

 

Can you suggest what I am missing to get this working.

[roadrunner84 466]

The A or B need to be upper case! The LED change on connection is probably a glitch, it shouldn't happen.

[krishnak 0]

Silly me - it works with A and B 

[Tyrone 0]

Hi Sir,

I am using MSP430g2231 microcontroller to generate two direction switch signal output, how to achieve

When someone by RX1, then through the RX2, D1 lit, said come into, and sent through NRF24L01,
When someone by RX2, then through RX1, D2 is lit, said Quit, and sent through NRF24L01,

If want use 6 data pipe MultiCeiver

RXTX.pdf