nes-proj/cpu/cc253x/dev/uart0.c
George Oikonomou 47db065034 Bugfixed the cc253x UART0 init (Thanks, Deng Jian)
The flush instruction was resetting the stop bit level to 'low'
2012-06-06 15:25:57 +01:00

75 lines
1.6 KiB
C

/**
* \file
*
* uart0 write routines
*
* \author
*
* Anthony "Asterisk" Ambuehl
*
*/
#include <stdlib.h>
#include <string.h>
#include "cc253x.h"
#include "sfr-bits.h"
#include "dev/uart0.h"
#if UART0_ENABLE
/*---------------------------------------------------------------------------*/
void
uart0_init()
{
#if UART0_CONF_HIGH_SPEED
UART_SET_SPEED(0, UART_460_M, UART_460_E);
#else
UART_SET_SPEED(0, UART_115_M, UART_115_E);
#endif
#ifdef UART0_ALTERNATIVE_2
PERCFG |= PERCFG_U0CFG; / *alternative port 2 = P1.5-2 */
#ifdef UART0_RTSCTS
P1SEL |= 0x3C; /* peripheral select for TX and RX, RTS, CTS */
#else
P1SEL |= 0x30; /* peripheral select for TX and RX */
P1 &= ~0x08; /* RTS down */
#endif
P1DIR |= 0x28; /* RTS, TX out */
P1DIR &= ~0x14; /* CTS & RX in */
#else
PERCFG &= ~PERCFG_U0CFG; /* alternative port 1 = P0.5-2 */
#ifdef UART0_RTSCTS
P0SEL |= 0x20 | 0x10; /* peripheral select for TX and RX */
#else
P0SEL |= 0x0C; /* peripheral select for TX and RX */
P0 &= ~0x20; /* RTS down */
#endif
P0DIR |= 0x28; /* RTS, TX out */
P0DIR &= ~0x14; /* CTS, RX in */
#endif
#ifdef UART0_RTSCTS
U0UCR = 0x42; /*defaults: 8N1, RTS/CTS, high stop bit*/
#else
U0UCR = 0x02; /*defaults: 8N1, no flow control, high stop bit*/
#endif
U0CSR = UCSR_MODE; /* UART mode */
U0UCR |= 0x80; /* Flush */
UART0_RX_EN();
UART0_RX_INT(1);
}
/*---------------------------------------------------------------------------*/
/* Write one byte over the UART. */
void
uart0_writeb(uint8_t byte)
{
UTX0IF = 0;
U0DBUF = byte;
while(!UTX0IF); /* Wait until byte has been transmitted. */
UTX0IF = 0;
}
#endif