MSP430F449_uart.rar_msp430F449 UART

//****************************************************************************** // MSP-Test44x Demo - USART0 UART 2400 Ultra-low Power Echo ISR, 32kHz ACLK // SEND DAT FOREXAMPLE 01 02 03 04 05 06 07 08 // Description; Echo a received character, RX ISR used. In the Mainloop UART0 // is made ready to receive one character with interrupt active. The Mainloop // waits in LPM3. The UART0 ISR forces the Mainloop to exit LPM3 after // receiving eight character which echo's back the received character. // lcd is used to show the character receverd . // ACLK = UCLK0 = LFXT1 = 32768, MCLK = SMCLK = DCO =1M // Baud rate divider with 32768hz XTAL @2400 = 32768Hz/2400 = 13.65 (000Dh) // //*An external watch crystal is required on XIN XOUT for ACLK*// // // MSP430F449 // ----------------- // /|\| XIN|- // | | | 32768Hz // --|RST XOUT|- // | | // | P2.4|-----------> // | | 2400 - 8N1 // | P2.5|<----------- // // // Lierda, Inc // February 2006.03 // Built with IAR Embedded Workbench Version: 3.40a // ID： MSP430-TEST44X // DATA：2005-7-12 // REV： 2.0A // 硬件连接如下： // 1、PC机串口连接TEST44X学习板的9芯串行接口 J5_232 // 2、对拨动开关P_232、P1、U_USART，只有拨动开关 U_USART 的P2脚和P5脚拨到ON 的位置； // //****************************************************************************** #include <msp430x44x.h> static unsigned char RXTXBUFF[8]; //recever (send)data buffer const unsigned char digit[16] = { 0x7B, /* "0" */ 0x12, /* "1" */ 0x4F, /* "2" */ 0x1F, /* "3" */ //0-F display table 0x36, /* "4" */ 0x3D, /* "5" */ 0x7D, /* "6" */ 0x13, /* "7" */ 0x7F, /* "8" */ 0x3F, /* "9" */ 0x77, /* "A" */ 0x7C, /* "B" */ 0x69, /* "c" */ 0x5E, /* "D" */ 0x6D, /* "E" */ 0x65, /* "F" */ }; //------------------------------------------------------- //------------mian ------------------------------------ //------------------------------------------------------- void main(void) { int i; WDTCTL = WDTPW + WDTHOLD; // Stop WDT FLL_CTL0 |= XCAP14PF; // Configure load caps UTCTL0 = SSEL0; // UCLK = ACLK UBR00 = 0x0d; // 32k/2400 - 13.65 UBR10 = 0x00; UMCTL0 = 0x6B; // Modulation UCTL0 = CHAR+PENA+PEV; // 8-bit character *SWRST* AND EVEN BIT //UCTL0 = CHAR; // no EVEN OR ODD BIT ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD IE1 |= URXIE0; // Enable USART0 RX interrupt P2SEL |= 0x30; // P2.4,5 = USART0 TXD/RXD P2DIR |= 0x10; // P2.4 output direction LCDCTL = LCDON + LCD4MUX + LCDP2; // STK LCD 4Mux, S0-S17 BTCTL = BTFRFQ1; // STK LCD freq P5SEL = 0xFC; // Common and Rxx all selected for (i=0; i<7; ++i) // Display "6543210" LCDMEM[i] = digit[i]; // Test display is ok? LCDMEM[7]=0x0D; i=0; _EINT(); // Enable interrupts // Mainloop for (;;) { _BIS_SR(LPM3_bits); // Wait in LPM3 until character RXed _NOP(); for (i=0;i<=7;i++) { while ((IFG1 & UTXIFG0) == 0); // USART0 TX buffer ready? TXBUF0 = RXTXBUFF[i]; // RXBUF0 to TXBUF0 } } } //interrupt[UART0RX_VECTOR] void usart0_rx (void) #pragma vector=UART0RX_VECTOR __interrupt void usart0_rx(void) { //i=rxtxbuff num,j=lcd display bit num,k=recever data num static int i,j,k; RXTXBUFF[i]=RXBUF0; // RXBUF0 TO BUFF LCDMEM[j]=digit[RXTXBUFF[i]&0x0F]; // display the date of recever LCDMEM[j+1]=digit[RXTXBUFF[i]>>4]; LCDMEM[6]=digit[k]; // display 0---f LCDMEM[7]=0x00; // lcd high bit clear 0 j=j>=4?0:j+2; k=k<0xF?k+1:0; i++; if (i>=8) // recever data =8 ? {i=0; // =8 ,send the data to cmputer _BIC_SR_IRQ(LPM3_bits); } // Clear LPM3 bits from 0(SR) }