Part Number: MSP430FR6889
Hello,
I am trying to write a program based on few information collected form different forum posts and some example codes. At this point I am able to directly send a ASCII value over UART but if I use the "printf" function nothing happens. At the end I want to send a few sensor data over UART. I would really appreciate it if someone can help me solve this issue. Here is my code:
#include <msp430.h>
#include "driverlib.h"
#include "NcApi.h"
#include "NeoParser.h"
#include "DSPLib.h"
#include <gpio.h>
#include <intrinsics.h> //
#include <stdint.h> //
#include <stdio.h> //
#define ENABLE_PINS 0xFFFE // Required to use inputs and outputs
#define UART_CLK_SEL 0x0080 // Specifies accurate clock for UART peripheral
#define BR0_FOR_9600 0x34 // Value required to use 9600 baud
#define BR1_FOR_9600 0x00 // Value required to use 9600 baud
#define CLK_MOD 0x4911 // Microcontroller will "clean-up" clock signal
#define ACLK 0x0100 // Timer_A SMCLK source
#define UP 0x0010 // Timer_A UP mode
volatile int receiveData = 0;
void select_clock_signals(void); // Assigns microcontroller clock signals
void assign_pins_to_uart(void); // P4.2 is for TXD, P4.3 is for RXD
void use_9600_baud(void); // UART operates at 9600 bits/second
void enable_TA0CTL(void); // Enable the timer 0 counter
void set_timer0_count(int);
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
PM5CTL0 = ENABLE_PINS; // Enable pins
select_clock_signals(); // Assigns microcontroller clock signals
assign_pins_to_uart(); // P4.2 is for TXD, P4.3 is for RXD
use_9600_baud(); // UART operates at 9600 bits/second
enable_TA0CTL();
UCA0IE = UCRXIE; // Enable RX interupt
_BIS_SR(GIE); // Activate enabled UART RXD interrupt
while(1)
{
static const int a=10;
//UCA0TXBUF = 0x55; // Send 0x55 out of P4.2
printf("Reading samples\n");
//printf("Reading samples %u\n",a);
}
}
//*********************************************************************************
//* UART Interrupt Service Routine *
//* This is the ISR for both the TX interrupt and the RX interrupt *
//*********************************************************************************
#pragma vector=USCI_A0_VECTOR
__interrupt void UART_ISR(void)
{
UCA0IFG = UCA0IFG & (~UCRXIFG); // Clear RX Interrupt FlaG
}
//*********************************************************************************
//* Select Clock Signals *
//*********************************************************************************
void select_clock_signals(void)
{
CSCTL0 = 0xA500; // "Password" to access clock calibration registers
CSCTL1 = 0x0046; // Specifies frequency of main clock
CSCTL2 = 0x0133; // Assigns additional clock signals
CSCTL3 = 0x0000; // Use clocks at intended frequency, do not slow them down
}
//*********************************************************************************
//* Used to Give UART Control of Appropriate Pins *
//*********************************************************************************
void assign_pins_to_uart(void)
{
P4SEL1 = 0x00; // 0000 0000
P4SEL0 = BIT3 | BIT2; // 0000 1100
// ^^
// ||
// |+---- 01 assigns P4.2 to UART Transmit (TXD)
// |
// +----- 01 assigns P4.3 to UART Receive (RXD)
}
//*********************************************************************************
//* Specify UART Baud Rate *
//*********************************************************************************
void use_9600_baud(void)
{
UCA0CTLW0 = UCSWRST; // Put UART into SoftWare ReSeT
UCA0CTLW0 = UCA0CTLW0 | UART_CLK_SEL; // Specifies clock source for UART
UCA0BR0 = BR0_FOR_9600; // Specifies bit rate (baud) of 9600
UCA0BR1 = BR1_FOR_9600; // Specifies bit rate (baud) of 9600
UCA0MCTLW = CLK_MOD; // "Cleans" clock signal
UCA0CTLW0 = UCA0CTLW0 & (~UCSWRST); // Takes UART out of SoftWare ReSeT
}
void enable_TA0CTL(void)
{
TA0CTL = ACLK | UP; // Set ACLK, UP MODE
TA0CCTL0 = CCIE; // Enable interrupt for Timer_0
}
void set_timer0_count(int x)
{
TA0CCR0 = x; //Used to set the timer0 counter
}
If I uncomment line 48 and 49 nothing shows up on the serial terminal. It only works when I uncomment line 47 and comment line 48 and 49.
Thanks.
