UART

Macros
#define	SPI_SIMO   BIT1
#define	SPI_SOMI   BIT2
#define	SPI_CLK   BIT3
#define	SD_CS   BIT7
#define	SPI_SEL   P4SEL
#define	SPI_DIR   P4DIR
#define	SPI_OUT   P4OUT
#define	SPI_REN   P4REN
#define	SD_CS_SEL   P3SEL
#define	SD_CS_OUT   P3OUT
#define	SD_CS_DIR   P3DIR
#define	UART_BUF_LEN   50
	Length of the temporary buffer we will use for containing strings to be written out over the UART. More...

Functions
void	uart_init (void)
	Set up the UCSI for UART operation at 9600 baud. More...
static void	_uart_tx (char *string)
	Takes a char pointer, transmit data over the UART until we find a null character. More...
void	uart_debug (char *string)
	Send a CRLF terminated string to the debug output (to avoid storing the terminators in RAM all the time). More...

Detailed Description

Macro Definition Documentation

#define UART_BUF_LEN   50

Length of the temporary buffer we will use for containing strings to be written out over the UART.

This should be set to at least the maximum length of any string to be transmitted, doing otherwise will cause a buffer overflow and undefined behaviour, even system crashes.

Function Documentation

static void _uart_tx ( char *  string )

static

Takes a char pointer, transmit data over the UART until we find a null character.

Parameters

string

A char pointer to the string to transmit

Todo:

This should time out instead of busy-wait forever.

void uart_debug

(

char *

string

)

Send a CRLF terminated string to the debug output (to avoid storing the terminators in RAM all the time).

Parameters

string

A char pointer to the string to transmit.

void uart_init

(

void

)

Set up the UCSI for UART operation at 9600 baud.

The baud rate generator is currently hard coded for 25MHz SMCLK.

Todo:

Fix this to calculate BRR values from F_CPU.