MSP430F1611 - UART

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MSP430F1611 - UART

by Sebastian Popa :: Rate this Message:

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Hi all,

I am trying to get the UART mode working. My setup is:
- MSP-TS430PM64 (with the optional 32 kHz external crystal oscillator
installed)
- MPS-FET430UIF Debug-Interface
- Code Composer Esentials 3
- a level converter for RS232
(http://www.tildesign.nl/rs232_ttl_converter-20107101P2N))
- and a one-to-one serial cable

I am using the sample code from TI.

However, I do get stuck in the do{}while loop of clearing
OSCFault flag.
Does anyone know why this is??

Further more, commenting out the do{}while the transmission of data
also gets stuck after the first character is set in the transmit
register. (I am using hyperterminal to connect to my serial port)

#include <msp430x16x.h>

int main(void)
{
volatile unsigned int i;

WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
BCSCTL1 |= XTS; // ACLK = LFXT1 = HF XTAL

do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?

UCTL0 |= SWRST; // USART logic held in reset state
BCSCTL2 |= SELM_3; // MCLK = LFXT1(safe)
ME1 |= UTXE0; // Enabled USART0 TXD (2^7 = 128 = 0x80)
UCTL0 |= CHAR; // 8-bit character
UTCTL0 |= SSEL0; // UCLK = ACLK
UBR00 = 0x45; // 8MHz 115200
UBR10 = 0x00; // 8MHz 115200
UMCTL0 = 0x00; // 8MHz 115200 modulation
UCTL0 &= ~SWRST; // Initalize USART state machine

while(1)
{
while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready?
TXBUF0 = 0x41;
}

return 0;
}

Re: MSP430F1611 - UART

by old_cow_yellow :: Rate this Message:

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You said you are using a 32 kHz crystal. But the code you use is
assuming that you have a "High Frequency" crystal. Thus the oscillator
will fail.

--- In msp430@..., "Sebastian Popa" <saberell@...> wrote:

>
> Hi all,
>
> I am trying to get the UART mode working. My setup is:
> - MSP-TS430PM64 (with the optional 32 kHz external crystal oscillator
> installed)
> - MPS-FET430UIF Debug-Interface
> - Code Composer Esentials 3
> - a level converter for RS232
> (http://www.tildesign.nl/rs232_ttl_converter-20107101P2N))
> - and a one-to-one serial cable
>
> I am using the sample code from TI.
>
> However, I do get stuck in the do{}while loop of clearing
> OSCFault flag.
> Does anyone know why this is??
>
>
> Further more, commenting out the do{}while the transmission of data
> also gets stuck after the first character is set in the transmit
> register. (I am using hyperterminal to connect to my serial port)
>
> #include <msp430x16x.h>
>
> int main(void)
> {
> volatile unsigned int i;
>
> WDTCTL = WDTPW + WDTHOLD; // Stop WDT
> P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
> BCSCTL1 |= XTS; // ACLK = LFXT1 = HF XTAL
>
> do
> {
> IFG1 &= ~OFIFG; // Clear OSCFault flag
> for (i = 0xFF; i > 0; i--); // Time for flag to set
> }
> while ((IFG1 & OFIFG)); // OSCFault flag still set?
>
> UCTL0 |= SWRST; // USART logic held in reset state
> BCSCTL2 |= SELM_3; // MCLK = LFXT1(safe)
> ME1 |= UTXE0; // Enabled USART0 TXD (2^7 = 128 = 0x80)
> UCTL0 |= CHAR; // 8-bit character
> UTCTL0 |= SSEL0; // UCLK = ACLK
> UBR00 = 0x45; // 8MHz 115200
> UBR10 = 0x00; // 8MHz 115200
> UMCTL0 = 0x00; // 8MHz 115200 modulation
> UCTL0 &= ~SWRST; // Initalize USART state machine
>
> while(1)
> {
> while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready?
> TXBUF0 = 0x41;
> }
>
> return 0;
> }
>