contiki/cpu/cc2430/dev/uart1.c

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2012-03-05 16:28:06 +00:00
/**
* \file
*
* uart1 write routines
*
* \author
*
* Anthony "Asterisk" Ambuehl
*
*/
#include <stdlib.h>
#include <string.h>
#include "cc2430_sfr.h"
#include "dev/uart1.h"
#if UART_ONE_ENABLE
/*---------------------------------------------------------------------------*/
/* UART1 initialization */
void
uart1_init()
{
#ifdef UART1_ALTERNATIVE_1
PERCFG &= ~U1CFG; /*alternative port 1 = P0.5-2*/
#ifdef UART1_RTSCTS
P0SEL |= 0x3C; /*peripheral select for TX and RX, RTS, CTS*/
#else
P0SEL |= 0x30; /*peripheral select for TX and RX*/
P0 &= ~0x08; /*RTS down*/
#endif
P0DIR |= 0x18; /*RTS, TX out*/
P0DIR &= ~0x24; /*CTS, RX in*/
#else
PERCFG |= U1CFG; /*alternative port 2 = P1.7-4*/
#ifdef UART1_RTSCTS
P1SEL |= 0xF0; /*peripheral select for TX and RX*/
#else
P1SEL |= 0xC0; /*peripheral select for TX and RX*/
P1 &= ~0x20; /*RTS down*/
#endif
P1DIR |= 0x60; /*RTS, TX out*/
P1DIR &= ~0x90; /*CTS, RX in*/
#endif
#if UART_ONE_CONF_HIGH_SPEED
UART_SET_SPEED(1, UART_460_M, UART_460_E);
#else
UART_SET_SPEED(1, UART_115_M, UART_115_E);
#endif
#ifdef UART1_RTSCTS
U1UCR = 0x42; /*defaults: 8N1, RTS/CTS, high stop bit*/
#else
U1UCR = 0x02; /*defaults: 8N1, no flow control, high stop bit*/
#endif
U1CSR = U_MODE | U_RE; /* UART mode, receiver enable */
/*set priority group of group 3 to highest, so the UART won't miss bytes*/
IP1 |= IP1_3;
IP0 |= IP0_3;
}
/*---------------------------------------------------------------------------*/
/* Write one byte over the UART. */
void
uart1_writeb(uint8_t byte)
{
IRCON2_UTX1IF = 0;
U1BUF = byte;
while(!IRCON2_UTX1IF); /* Wait until byte has been transmitted. */
IRCON2_UTX1IF = 0;
}
/*---------------------------------------------------------------------------*/
#endif