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/*
* Uart driver for Lattice Mico32 (lm32) UART
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*
* COPYRIGHT (c) Yann Sionneau <yann.sionneau@telecom-sudparis.eu> (GSoC 2010)
* Telecom SudParis
*/
#include "../include/system_conf.h"
#include "uart.h"
#include <rtems/libio.h>
static inline int uartread(unsigned int reg)
{
return *((int*)(reg));
}
static inline void uartwrite(unsigned int reg, int value)
{
*((int*)(reg)) = value;
}
void BSP_uart_init(int baud)
{
/* Set baud rate */
uartwrite(MM_UART_DIV, CPU_FREQUENCY/baud/16);
}
void BSP_uart_polled_write(char ch)
{
int ip;
/* Wait until THR is empty. */
uartwrite(MM_UART_RXTX, ch);
do {
lm32_read_interrupts(ip);
} while (! (ip & MM_IRQ_UARTTX) );
lm32_interrupt_ack(MM_IRQ_UARTTX);
}
char BSP_uart_polled_read( void )
{
int ip;
/* Wait until there is a byte in RBR */
do {
lm32_read_interrupts(ip);
} while(! (ip & MM_IRQ_UARTRX) );
lm32_interrupt_ack(MM_IRQ_UARTRX);
return (char) uartread(MM_UART_RXTX);
}
char BSP_uart_is_character_ready(char *ch)
{
int ip;
lm32_read_interrupts(ip);
if (ip & MM_IRQ_UARTRX)
{
*ch = (char) uartread(MM_UART_RXTX);
lm32_interrupt_ack(MM_IRQ_UARTRX);
return true;
}
*ch = '0';
return false;
}
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