Other Parts Discussed in Thread: MSP430G2452
hi
i am joju mohan i have problem with uart rx section my cod is given below . In this tx from mcu is happening but rx is not working
This is a program for eco rx byte at rate 9600 for launch pad so help me??
//***********************************************************
// Software UART
//
//***********************************************************
#include <msp430g2452.h>
#define TXD BIT1 // TXD on P1.1
#define RXD BIT2 // RXD on P1.2
#define Bitime 13 // 0x0D
#define Bitime_5 5
unsigned int TXByte;
unsigned char BitCnt;
void ConfigWDT(void);
void ConfigClocks(void);
void ConfigUART(void);
void Transmit(void);
void RX_Ready (void);
void main(void)
{
ConfigWDT();
ConfigClocks();
ConfigUART();
_bis_SR_register(GIE);
TXByte='J';
Transmit();
for (;;)
{
RX_Ready(); // UART ready to RX one Byte
_BIS_SR(LPM3_bits + GIE); // Enter LPM3 w/ interr until char RXed
Transmit(); // TX Back RXed Byte Received
}
}
void ConfigWDT(void)
{
WDTCTL = WDTPW + WDTHOLD;
// Enable WDT interrupt
}
void ConfigClocks(void)
{
if (CALBC1_1MHZ ==0xFF || CALDCO_1MHZ == 0xFF)
while(1); // If calibration data is erased
// run FaultRoutine()
BCSCTL1 = CALBC1_1MHZ; // Set range
DCOCTL = CALDCO_1MHZ; // Set DCO step + modulation
BCSCTL3 |= LFXT1S_2; // LFXT1 = VLO
IFG1 &= ~OFIFG; // Clear OSCFault flag
BCSCTL2 = 0; // MCLK = DCO = SMCLK
}
void ConfigUART(void)
{
P1SEL |= TXD + RXD; // P1.1 & 2 TA0, rest GPIO
P1DIR = ~(BIT3 + RXD); // P1.3 input, other outputs
P1OUT = 0; // clear output pins
CCTL0 = OUT; // TXD Idle as Mark
TACTL = TASSEL_2 + MC_2 + ID_3; // SMCLK/8, continuos mode
}
// Function Transmits Character from TXByte
void Transmit()
{
BitCnt = 0xA; // Load Bit counter, 8data + ST/SP
while (CCR0 != TAR) // Prevent async capture
CCR0 = TAR; // Current state of TA counter
CCR0 += Bitime; // Some time till first bit
TXByte |= 0x100; // Add mark stop bit to TXByte
TXByte = TXByte << 1; // Add space start bit
CCTL0 = CCIS0 + OUTMOD0 + CCIE; // TXD = mark = idle
while ( CCTL0 & CCIE ); // Wait for TX completion
}
// Timer A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
{
CCR0 += Bitime; // Add Offset to CCR0
// TX
if (CCTL0 & CCIS0) // TX on CCI0B?
{
if ( BitCnt == 0)
CCTL0 &= ~ CCIE; // All bits TXed, disable interrupt
else
{
CCTL0 |= OUTMOD2; // TX Space
if (TXByte & 0x01)
CCTL0 &= ~ OUTMOD2; // TX Mark
TXByte = TXByte >> 1;
BitCnt --;
}
}
// RX
else
{
if( CCTL0 & CAP ) // Capture mode = start bit edge
{
CCTL0 &= ~ CAP; // Switch from capture to compare mode
CCR0 += Bitime_5;
}
else
{
TXByte = TXByte >> 1;
if (CCTL0 & SCCI) // Get bit waiting in receive latch
TXByte |= 0x80;
BitCnt --; // All bits RXed?
if ( BitCnt == 0)
//>>>>>>>>>> Decode of Received Byte Here <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
{
CCTL0 &= ~ CCIE; // All bits RXed, disable interrupt
_BIC_SR_IRQ(LPM3_bits); // Clear LPM3 bits from 0(SR)
}
//>>>>>>>>>> Decode of Received Byte Here <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
}
}
}
// Function Readies UART to Receive Character into RXTXData Buffer
void RX_Ready (void)
{
BitCnt = 0x8; // Load Bit counter
CCTL0 = SCS + OUTMOD0 + CM1 + CAP + CCIE; // Sync, Neg Edge, Cap
}
