Part Number: MSP430FR2353
Other Parts Discussed in Thread: MSP430FR2355
Tool/software: Code Composer Studio
I am able to send a single characters but I want to send the strings of characters like "AMIT" to RealTerm with the help of this programs.I just want to know what kind of modification is required to send strings in this program (MSP430FR2355):-
#include <msp430.h>
void Software_Trim(); // Software Trim to get the best DCOFTRIM value
#define MCLK_FREQ_MHZ 1 // MCLK = 1MHz
unsigned char RXData = 0;
unsigned char TXData ='A';
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
__bis_SR_register(SCG0); // Disable FLL
CSCTL3 = SELREF__REFOCLK; // Set REFO as FLL reference source
CSCTL1 = DCOFTRIMEN_1 | DCOFTRIM0 | DCOFTRIM1 | DCORSEL_0;// DCOFTRIM=3, DCO Range = 1MHz
CSCTL2 = FLLD_0 + 30; // DCODIV = 1MHz
__delay_cycles(3);
__bic_SR_register(SCG0); // Enable FLL
Software_Trim(); // Software Trim to get the best DCOFTRIM value
CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK; // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz
// default DCODIV as MCLK and SMCLK source
PM5CTL0 &= ~LOCKLPM5; // Disable the GPIO power-on default high-impedance mode
// to activate previously configured port settings
P1DIR |= BIT0;
P1OUT &= ~BIT0; // P1.0 out low
// Configure UART pins
P1SEL0 |= BIT6 | BIT7; // set 2-UART pin as second function
// Configure UART
UCA0CTLW0 |= UCSWRST; // Put eUSCI in reset
UCA0CTLW0 |= UCSSEL__SMCLK;
// Baud Rate calculation
UCA0BR0 = 8; // 1000000/115200 = 8.68
UCA0MCTLW = 0xD600; // 1000000/115200 - INT(1000000/115200)=0.68
// UCBRSx value = 0xD6 (See UG)
UCA0BR1 = 0;
UCA0CTLW0 &= ~UCSWRST; // Initialize eUSCI
UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt
while (1)
{
while(!(UCA0IFG & UCTXIFG));
UCA0TXBUF = TXData; // Load data onto buffer
__bis_SR_register(LPM0_bits|GIE); // Enter LPM0
__no_operation(); // For debugger
}
}
void Software_Trim()
{
unsigned int oldDcoTap = 0xffff;
unsigned int newDcoTap = 0xffff;
unsigned int newDcoDelta = 0xffff;
unsigned int bestDcoDelta = 0xffff;
unsigned int csCtl0Copy = 0;
unsigned int csCtl1Copy = 0;
unsigned int csCtl0Read = 0;
unsigned int csCtl1Read = 0;
unsigned int dcoFreqTrim = 3;
unsigned char endLoop = 0;
do
{
CSCTL0 = 0x100; // DCO Tap = 256
do
{
CSCTL7 &= ~DCOFFG; // Clear DCO fault flag
}while (CSCTL7 & DCOFFG); // Test DCO fault flag
__delay_cycles((unsigned int)3000 * MCLK_FREQ_MHZ);// Wait FLL lock status (FLLUNLOCK) to be stable
// Suggest to wait 24 cycles of divided FLL reference clock
while((CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)) && ((CSCTL7 & DCOFFG) == 0));
csCtl0Read = CSCTL0; // Read CSCTL0
csCtl1Read = CSCTL1; // Read CSCTL1
oldDcoTap = newDcoTap; // Record DCOTAP value of last time
newDcoTap = csCtl0Read & 0x01ff; // Get DCOTAP value of this time
dcoFreqTrim = (csCtl1Read & 0x0070)>>4;// Get DCOFTRIM value
if(newDcoTap < 256) // DCOTAP < 256
{
newDcoDelta = 256 - newDcoTap; // Delta value between DCPTAP and 256
if((oldDcoTap != 0xffff) && (oldDcoTap >= 256)) // DCOTAP cross 256
endLoop = 1; // Stop while loop
else
{
dcoFreqTrim--;
CSCTL1 = (csCtl1Read & (~DCOFTRIM)) | (dcoFreqTrim<<4);
}
}
else // DCOTAP >= 256
{
newDcoDelta = newDcoTap - 256; // Delta value between DCPTAP and 256
if(oldDcoTap < 256) // DCOTAP cross 256
endLoop = 1; // Stop while loop
else
{
dcoFreqTrim++;
CSCTL1 = (csCtl1Read & (~DCOFTRIM)) | (dcoFreqTrim<<4);
}
}
if(newDcoDelta < bestDcoDelta) // Record DCOTAP closest to 256
{
csCtl0Copy = csCtl0Read;
csCtl1Copy = csCtl1Read;
bestDcoDelta = newDcoDelta;
}
}while(endLoop == 0); // Poll until endLoop == 1
CSCTL0 = csCtl0Copy; // Reload locked DCOTAP
CSCTL1 = csCtl1Copy; // Reload locked DCOFTRIM
while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)); // Poll until FLL is locked
}
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
switch(__even_in_range(UCA0IV,USCI_UART_UCTXCPTIFG))
{
case USCI_NONE: break;
case USCI_UART_UCRXIFG:
UCA0IFG &=~ UCRXIFG; // Clear interrupt
RXData = UCA0RXBUF; // Clear buffer
if(RXData != TXData) // Check value
{
P1OUT |= BIT0; // If incorrect turn on P1.0
while(1); // trap CPU
}
TXData++; // increment data byte
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0 on reti
break;
case USCI_UART_UCTXIFG: break;
case USCI_UART_UCSTTIFG: break;
case USCI_UART_UCTXCPTIFG: break;
}
}
