MSP430F5529: UART Driverlib Initialize Proplem ???

Blur

Part Number: MSP430F5529

Hello, I am new programming with msp430. I have a MSP430 F5529 Lauchpad. To day I am using UART module base on example in DriverLib. This example is loop back data. After I download code into chip and debug, I connect P3.3 with P3.4 (wire Rx With Tx) but do not receive any thing. What is wrong ???

My code here:

#include "driverlib.h"
#include "string.h"

volatile uint8_t receive_data=0;
uint8_t transmit_data[]="Hello World. I'm UART Module of MSP430F5529 Microcontroller !!!\r\n";

void Uart_Init(void);
void delay(uint32_t time);


#pragma vector=USCI_A0_VECTOR
__interrupt void UART_Isr(void)
{
	if(USCI_A_UART_getInterruptStatus(USCI_A0_BASE,
			USCI_A_UART_RECEIVE_INTERRUPT_FLAG)
			==	USCI_A_UART_RECEIVE_INTERRUPT_FLAG)
	{
		receive_data=USCI_A_UART_receiveData(USCI_A0_BASE);
		USCI_A_UART_clearInterrupt(USCI_A0_BASE,USCI_A_UART_RECEIVE_INTERRUPT_FLAG);
	}
}

void main( void )
{
	/* Stop watchdog timer */
	WDT_A_hold(WDT_A_BASE);

	Uart_Init();

	__enable_interrupt();

	while(1)
	{
		for(uint8_t i=0;i<strlen((char const*)transmit_data);i++)
		{
			USCI_A_UART_transmitData(USCI_A0_BASE,*(transmit_data+i));

                        /* Wait transmission is completed */
			while(USCI_A_UART_queryStatusFlags(USCI_A0_BASE,USCI_A_UART_BUSY)==USCI_A_UART_BUSY);
		}

		delay(2000000);
	}
}



void Uart_Init(void)
{
	USCI_A_UART_initParam para;

	/*  Baudrate = 9600, clock freq = 1.048MHz
         * UCBRx = 109, UCBRFx = 0, UCBRSx = 2, UCOS16 = 0
	 *
	 * From: Table 39-5. Recommended Settings for Typical Crystals and Baud Rates at Page 1039/1189 User guide.
	 * For more information about baudrate setting see 39.3.10 Setting a Baud Rate at page 1036 User Guide
	 */
	para.selectClockSource = USCI_A_UART_CLOCKSOURCE_SMCLK; 
	para.clockPrescalar = 109; 
	para.firstModReg = 0; 
	para.secondModReg = 2; 
	para.parity = USCI_A_UART_NO_PARITY;
	para.msborLsbFirst = USCI_A_UART_LSB_FIRST;
	para.numberofStopBits = USCI_A_UART_ONE_STOP_BIT;
	para.uartMode = USCI_A_UART_MODE;
	para.overSampling = USCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;

	USCI_A_UART_init(USCI_A0_BASE,&para);
	USCI_A_UART_enable(USCI_A0_BASE);
	USCI_A_UART_clearInterrupt(USCI_A0_BASE,USCI_A_UART_RECEIVE_INTERRUPT);
	USCI_A_UART_enableInterrupt(USCI_A0_BASE,USCI_A_UART_RECEIVE_INTERRUPT);

}

void delay(uint32_t time)
{
	while(time--);
}

over 8 years ago

0 Clemens Ladisch over 8 years ago

Guru 318760 points

You have configured the UART itself, but not the P3.3/4 pins.

0 Blur over 8 years ago in reply to Clemens Ladisch

Prodigy 100 points

Hi! Thanks for your reply. what should I do ?

0 Clemens Ladisch over 8 years ago in reply to Blur

Guru 318760 points

You should configure the pins.

For example, the driverlib example usci_a_uart_ex1_loopbackAdvance.c has this:

    //P3.4,5 = USCI_A0 TXD/RXD
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P3,
        GPIO_PIN4 + GPIO_PIN5
        );

(these pins would be wrong for your model)

0 Blur over 8 years ago in reply to Clemens Ladisch

Prodigy 100 points

Yes, i have check datasheet of MSP430F5529 MCU. Rx and Tx pin mapping at P3.4 and P3.3. But I see in "gpio.h", comments of brief said that "//! \brief This function configures the peripheral module function in the input direction for the selected pin. This function configures the peripheral module function in the input direction for the selected pin for either primary, secondary or ternary module function modes. Note that MSP430F5xx/6xx family doesn't support these function modes." My MCU is MSP430F5529 :(

0 Clemens Ladisch over 8 years ago in reply to Blur

Guru 318760 points

The primary/secondary/ternary function mode does not exist in the 5xx/6xx family, so you do not need to care about it. (That text is just for users of other families who wonder where the third parameter of GPIO_setAsPeripheralModuleFunctionInputPin() did go.)

0 Blur over 8 years ago in reply to Clemens Ladisch

Prodigy 100 points

Thanks for your help. But I have been add this code at the top of Uart_Init() function

GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P3,GPIO_PIN3 + GPIO_PIN4);

or this code

GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P3, GPIO_PIN4); // Rx Pin
GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P3,GPIO_PIN3); // Tx Pin

I do not receive any thing :(

0 Clemens Ladisch over 8 years ago in reply to Blur

Guru 318760 points

The code doesn't do anything with the received data. How do you check if it is receiving?

0 Blur over 8 years ago in reply to Clemens Ladisch

Prodigy 100 points

I have add Interrupt Service Rountie at the top of main.c. In this function I check the RECEIVE_INTERRUPT_FLAG then read data to receive_data variable. This code here:

#pragma vector=USCI_A0_VECTOR
__interrupt void UART_Isr(void)
{
    if(USCI_A_UART_getInterruptStatus(USCI_A0_BASE,
            USCI_A_UART_RECEIVE_INTERRUPT_FLAG)
            ==  USCI_A_UART_RECEIVE_INTERRUPT_FLAG)
    {
        receive_data=USCI_A_UART_receiveData(USCI_A0_BASE);
        USCI_A_UART_clearInterrupt(USCI_A0_BASE,USCI_A_UART_RECEIVE_INTERRUPT_FLAG);
    }
}

0 machina_dragon over 8 years ago

Prodigy 10 points

I have a same problem when i test with example in driverlib on msp430F55 , I hope i could get the answer from this post.

0 Clemens Ladisch over 8 years ago in reply to Blur

Guru 318760 points

And what do you then do with the receive_data variable? What do you expect to happen, and what actually happens instead?

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MSP430F5529: UART Driverlib Initialize Proplem ???