MSP430FR2422: UART

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//******************************************************************************
//! EUSCI_A0 External Loopback test using EUSCI_A_UART_init API
//!
//! Description: This demo connects TX to RX of the MSP430 UART
//! The example code shows proper initialization of registers
//! and interrupts to receive and transmit data.
//!
//! SMCLK = MCLK = BRCLK = DCOCLKDIV = ~1MHz, ACLK = 32.768kHz
//!
//!
//! MSP430FR2xx_4xx Board
//! -----------------
//! RST -| UCA0TXD|----|
//! | | |
//! | | |
//! | UCA0RXD|----|
//! | |
//!
//! This example uses the following peripherals and I/O signals. You must
//! review these and change as needed for your own board:
//! - UART peripheral
//! - GPIO Port peripheral (for UART pins)
//! - UCA0TXD
//! - UCA0RXD
//!
//! This example uses the following interrupt handlers. To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - USCI_A0_VECTOR.
//******************************************************************************
#include "driverlib.h"
//#include "Board.h"
#define GPIO_PORT_UCA0TXD GPIO_PORT_P1
#define GPIO_PIN_UCA0TXD GPIO_PIN4
#define GPIO_FUNCTION_UCA0TXD GPIO_PRIMARY_MODULE_FUNCTION
#define GPIO_PORT_UCA0RXD GPIO_PORT_P1
#define GPIO_PIN_UCA0RXD GPIO_PIN5
#define GPIO_FUNCTION_UCA0RXD GPIO_PRIMARY_MODULE_FUNCTION
uint16_t i;
unsigned long int m=0;
uint8_t RXData = 0;
unsigned long int TXData = 10;
uint8_t check = 0;
char mystr[15]="Hello_World";
void send(char);
void main(void)
{
//Stop Watchdog Timer
WDT_A_hold(WDT_A_BASE);
SYSCFG3 &= ~USCIARMP;
// *ptr = mystr;

//Set ACLK = REFOCLK with clock divider of 1
CS_initClockSignal(CS_ACLK,CS_REFOCLK_SELECT,CS_CLOCK_DIVIDER_1);
//Set SMCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_SMCLK,CS_DCOCLKDIV_SELECT,CS_CLOCK_DIVIDER_1);
//Set MCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_MCLK,CS_DCOCLKDIV_SELECT,CS_CLOCK_DIVIDER_1);

//Configure UART pins
GPIO_setAsPeripheralModuleFunctionInputPin(
GPIO_PORT_UCA0TXD,
GPIO_PIN_UCA0TXD,
GPIO_FUNCTION_UCA0TXD
);
GPIO_setAsPeripheralModuleFunctionInputPin(
GPIO_PORT_UCA0RXD,
GPIO_PIN_UCA0RXD,
GPIO_FUNCTION_UCA0RXD
);

/*
* Disable the GPIO power-on default high-impedance mode to activate
* previously configured port settings
*/
PMM_unlockLPM5();

//Configure UART
//SMCLK = 1MHz, Baudrate = 115200
//UCBRx = 8, UCBRFx = 0, UCBRSx = 0xD6, UCOS16 = 0
EUSCI_A_UART_initParam param = {0};
param.selectClockSource = EUSCI_A_UART_CLOCKSOURCE_SMCLK;
param.clockPrescalar = 8;
param.firstModReg = 0;
param.secondModReg = 0xD6;
param.parity = EUSCI_A_UART_NO_PARITY;
param.msborLsbFirst = EUSCI_A_UART_LSB_FIRST;
param.numberofStopBits = EUSCI_A_UART_ONE_STOP_BIT;
param.uartMode = EUSCI_A_UART_MODE;
param.overSampling = EUSCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;

if (STATUS_FAIL == EUSCI_A_UART_init(EUSCI_A0_BASE, &param)) {
return;
}

EUSCI_A_UART_enable(EUSCI_A0_BASE);

//EUSCI_A_UART_clearInterrupt(EUSCI_A0_BASE,
// EUSCI_A_UART_RECEIVE_INTERRUPT);

// Enable USCI_A0 RX interrupt
// EUSCI_A_UART_enableInterrupt(EUSCI_A0_BASE,
// EUSCI_A_UART_RECEIVE_INTERRUPT);

// Enable global interrupts
//__enable_interrupt();

while (1)
{
// Increment TX data

// Load data onto buffer
int f;
for(f=0;mystr[f]!='\0';f++)
{
UCA0TXBUF=mystr[f];
EUSCI_A_UART_transmitData(EUSCI_A0_BASE,UCA0TXBUF);

}

for(m=0;m<10000;m++);
// while(check != 1);
//check = 0;
}

}
//******************************************************************************
//
//This is the USCI_A0 interrupt vector service routine.
//
//******************************************************************************
//#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
//#pragma vector=USCI_A0_VECTOR
//__interrupt
/*#elif defined(__GNUC__)
__attribute__((interrupt(USCI_A0_VECTOR)))
#endif
void EUSCI_A0_ISR(void)
{
switch(__even_in_range(UCA0IV,USCI_UART_UCTXCPTIFG))
{
case USCI_NONE: break;
case USCI_UART_UCRXIFG:
RXData = EUSCI_A_UART_receiveData(EUSCI_A0_BASE);
// Check value
if(!(RXData == TXData))
{
while(1);
}
check =1;
break;
case USCI_UART_UCTXIFG: break;
case USCI_UART_UCSTTIFG: break;
case USCI_UART_UCTXCPTIFG: break;
}
}*/

/*void send(char mystr)
{

UCA0TXBUF=mystr;

}*/

> UCA0TXBUF=mystr[f];
> EUSCI_A_UART_transmitData(EUSCI_A0_BASE,UCA0TXBUF);

I'm not quite sure what you're trying to accomplish here. transmitData() writes to TXBUF for you, and also takes care of the register protocol. I (still) recommend the code I posted above:

>    EUSCI_A_UART_transmitData(EUSCI_A0_BASE,mystr[i]);// byte-wise