MEAM.Design - Senior Design - Team 06 (Chris, Edgar, Holt, Hughes) - Engineering Responsibilities- Mechatronics- GPS Reading

USART

GPS Setting

  • Serial 0 (NMEA)4800 Baud
  • 8 data Bits
  • No Parity
  • 1 Stop Bit
  • No flow Control

USART Initialization

Steps

  • set the baud rate
  • set frame format
  • enable the Transmitter or the Receiver depending on the usage.

Sample Code

void USART_Init( unsigned int baud )
{
/* Set baud rate */
UBRR1H = (unsigned char)(baud>>8);
UBRR1L = (unsigned char)baud;
/* Enable receiver and transmitter */
UCSR1B = (1<<RXEN1)|(1<<TXEN1);
/* Set frame format: 8data, 2stop bit */
UCSR1C = (1<<USBS1)|(3<<UCSZ10);
}

Calculating UBBRn (baud in the sample code) for a given Baud rate

UBBRn = baud =fosc/(Baud_rate*16) -1 (:commentboxchrono:)