MSP430, CCS, USCI_A1, BackChannel, UartEcho

MSP430, CCS, USCI_A1, BackChannel, UartEcho

※ msp430.h 를 사용하는 소스입니다.

msp430fr6989 개발 키트에서 사용하고 있는

BackChannel 은 USCI_A1 을 사용하고 있으며

관련하여 Uart 사용법에 대한 부분입니다.

Did you have a look at the example codes for the MCU that is provided by TI for almost every processor?

www.ti.com/lit/zip/slac536

The following examples show how to set up the clocks:

msp430fr59xx_cs_01.c       Configure MCLK for 8MHz operation
msp430fr59xx_cs_02.c       Configure MCLK for 16MHz operation
msp430fr59xx_cs_03.c       Output 32768Hz crystal on XT1 and observe failsafe
msp430fr59xx_cs_04.c       ACLK = XT1 = 32768Hz, SMCLK= XT2 = 8MHz, MCLK = DCO
msp430fr59xx_cs_05.c       Using LFXT in bypass mode, failsafe operation shown

0. 참고 사항

• C:\ti\msp\MSP430Ware_3_80_04_05\examples\devices\MSP430FR5xx_6xx\MSP430FR5x8x_MSP430FR692x_MSP430FR6x7x_MSP430FR6x8x_Code_Examples\C
  
• http://e2e.ti.com/support/microcontrollers/msp430/f/166/p/368560/1297094
• https://github.com/achopra6/MSP430FR6989/blob/master/timer.c
• http://www.ti.com/lit/ds/symlink/msp430fr6989.pdf
• http://www.ti.com/lit/ug/slau367o/slau367o.pdf

출처: http://coyoteugly.tistory.com/188 [마이콤 개발자를 위한 여행]

0. 참고 사항

• C:\ti\msp\MSP430Ware_3_80_04_05\examples\devices\MSP430FR5xx_6xx\MSP430FR5x8x_MSP430FR692x_MSP430FR6x7x_MSP430FR6x8x_Code_Examples
  
• www.ti.com/lit/zip/slac536
  
• http://www.ti.com/lit/ug/slau627a/slau627a.pdf
  
• http://www.ti.com/lit/ds/symlink/msp430fr6989.pdf
• http://www.ti.com/lit/ug/slau367o/slau367o.pdf

1. 소스 설명

full 소스는 아래 github를 통해 확인하세요.

USCI_A1
P3.5 : UCA0RXD
P3.4 : UCA0TXD
BaudRate : 9600

#include <msp430.h> int main(void) {     WDTCTL = WDTPW | WDTHOLD;                 // Stop Watchdog     // Configure GPIO     P3SEL0 |= BIT4 | BIT5;                    // USCI_A1 UART operation     P3SEL1 &= ~(BIT4 | BIT5);     // Disable the GPIO power-on default high-impedance mode to activate     // previously configured port settings     PM5CTL0 &= ~LOCKLPM5;     // Startup clock system with max DCO setting ~8MHz     CSCTL0_H = CSKEY >> 8;                    // Unlock clock registers     CSCTL1 = DCOFSEL_3 | DCORSEL;             // Set DCO to 8MHz     CSCTL2 = SELA__VLOCLK | SELS__DCOCLK | SELM__DCOCLK;     CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1;     // Set all dividers     CSCTL0_H = 0;                             // Lock CS registers     // Configure USCI_A1 for UART mode     UCA1CTLW0 = UCSWRST;                      // Put eUSCI in reset     UCA1CTLW0 |= UCSSEL__SMCLK;               // CLK = SMCLK     // Baud Rate calculation     // 8000000/(16*9600) = 52.083     // Fractional portion = 0.083     // User's Guide Table 21-4: UCBRSx = 0x04     // UCBRFx = int ( (52.083-52)*16) = 1     UCA1BR0 = 52;                             // 8000000/16/9600     UCA1BR1 = 0x00;     UCA1MCTLW |= UCOS16 | UCBRF_1 | 0x4900;     UCA1CTLW0 &= ~UCSWRST;                    // Initialize eUSCI     UCA1IE |= UCRXIE;                         // Enable USCI_A1 RX interrupt     __bis_SR_register(LPM3_bits | GIE);       // Enter LPM3, interrupts enabled     __no_operation();                         // For debugger } #pragma vector=USCI_A1_VECTOR __interrupt void USCI_A1_ISR(void) {     switch(__even_in_range(UCA1IV, USCI_UART_UCTXCPTIFG))     {     case USCI_NONE: break;     case USCI_UART_UCRXIFG:         while(!(UCA1IFG & UCTXIFG));         UCA1TXBUF = UCA1RXBUF;         __no_operation();         break;     case USCI_UART_UCTXIFG: break;     case USCI_UART_UCSTTIFG: break;     case USCI_UART_UCTXCPTIFG: break;     } }

P1.0 LED

use USCI_A0

• P2.1 : UCA0RXD
• P2.0 : UCA0TXD
• BaudRate : 115200

출처: http://coyoteugly.tistory.com/category/MSP430 [마이콤 개발자를 위한 여행]

2. 소스

• https://github.com/sglee0223/msp430/tree/master/BackChannel
  

3. 결과