Other Parts Discussed in Thread: MSP430G2553, MSP430G2231, ENERGIA
Hi, Im really beginner with MSP430 LaunchPad and uP programing as well. I'd like to know how to works UART communication. I have read the family guide, but anyway I don't understand. Could u provide me some easy code example...for example HT will read char from keyboard. Thank u
Okay..
So, if you are planning to test the Launchpad's individually, lets say, the Rev 1.5 with G2553.
Do the following:
1. Invert the positions of the headers on RXD,TXD , as shown in the figure below.
2. Flash the attached code into the MSP using CCS
The code echoes back the character typed from the PC back to the PC, so that you can observe it on the COM port monitor.
//******************************************************************************
// MSP430G2xx3 Demo - USCI_A0, 9600 UART Echo ISR, DCO SMCLK
//
// Description: Echo a received character, RX ISR used. Normal mode is LPM0.
// USCI_A0 RX interrupt triggers TX Echo.
// Baud rate divider with 1MHz = 1MHz/9600 = ~104.2
// ACLK = n/a, MCLK = SMCLK = CALxxx_1MHZ = 1MHz
//
// MSP430G2xx3
// -----------------
// /|\| XIN|-
// | | |
// --|RST XOUT|-
// | |
// | P1.2/UCA0TXD|------------>
// | | 9600 - 8N1
// | P1.1/UCA0RXD|<------------
//
// D. Dang
// Texas Instruments Inc.
// February 2011
// Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include "msp430g2553.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
BCSCTL1 = CALBC1_1MHZ; // Set DCO
DCOCTL = CALDCO_1MHZ;
P1SEL = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
P1SEL2 = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 104; // 1MHz 9600
UCA0BR1 = 0; // 1MHz 9600
UCA0MCTL = UCBRS0; // Modulation UCBRSx = 1
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled
}
// Echo back RXed character, confirm TX buffer is ready first
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
}
3. Open a Serial Monitor (Putty,Hyperterminal, or you could use the one that come with Energia, the Ardunio based programming platform for MSP430) and type in some character and observe the echo on the monitor.
If you are still not able to view it using the Serial Monitor of your choice, I suggest you download Energia and use its serial monitor (it always works for me in this way, even when other monitors fail, due to some unknown errors)
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