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/*******************************************************************************
* (c) Copyright 2013 Microsemi SoC Products Group. All rights reserved.
*
* Redirection of the standard library I/O to one of the SmartFusion2
* MMUART.
*
* SVN $Revision: 7375 $
* SVN $Date: 2015-05-01 14:57:40 +0100 (Fri, 01 May 2015) $
*/
/*==============================================================================
* The content of this source file will only be compiled if either one of the
* following two defined symbols are defined in the project settings:
* - MICROSEMI_STDIO_THRU_MMUART0
* - MICROSEMI_STDIO_THRU_MMUART1
*
*/
#ifdef MICROSEMI_STDIO_THRU_MMUART0
#ifndef MICROSEMI_STDIO_THRU_UART
#define MICROSEMI_STDIO_THRU_UART
#endif
#endif /* MICROSEMI_STDIO_THRU_MMUART0 */
#ifdef MICROSEMI_STDIO_THRU_MMUART1
#ifndef MICROSEMI_STDIO_THRU_UART
#define MICROSEMI_STDIO_THRU_UART
#endif
#endif /* MICROSEMI_STDIO_THRU_MMUART1 */
/*==============================================================================
* Actual implementation.
*/
#ifdef MICROSEMI_STDIO_THRU_UART
#include <stdio.h>
#include <rt_misc.h>
#include "m2sxxx.h"
#include "mss_uart.h"
#include "core_uart_apb.h"
/*
* The baud rate will default to 57600 baud if no baud rate is specified though the
* MICROSEMI_STDIO_BAUD_RATE define.
*/
#ifndef MICROSEMI_STDIO_BAUD_RATE
#define MICROSEMI_STDIO_BAUD_RATE MSS_UART_115200_BAUD
#endif
#ifdef MICROSEMI_STDIO_THRU_MMUART0
static mss_uart_instance_t * const gp_my_uart = &g_mss_uart0;
#else
static mss_uart_instance_t * const gp_my_uart = &g_mss_uart1;
#endif
/*==============================================================================
* Flag used to indicate if the UART driver needs to be initialized.
*/
static int g_stdio_uart_init_done = 0;
#define LSR_THRE_MASK 0x20u
/*
* Disable semihosting apis
*/
#pragma import(__use_no_semihosting_swi)
/*==============================================================================
* sendchar()
*/
int sendchar(int ch)
{
uint32_t tx_ready;
//第一次调用时，初始化串口
if(!g_stdio_uart_init_done)
{
MSS_UART_init(gp_my_uart,
MICROSEMI_STDIO_BAUD_RATE,
MSS_UART_DATA_8_BITS | MSS_UART_NO_PARITY);
g_stdio_uart_init_done = 1;
}
do {
tx_ready = gp_my_uart->hw_reg->LSR & LSR_THRE_MASK;
} while(!tx_ready);
gp_my_uart->hw_reg->THR = ch;
return (ch);
}
/*==============================================================================
*
*/
struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;
FILE __stdin;
/*==============================================================================
* fputc()
*/
int fputc(int ch, FILE *f)
{
return (sendchar(ch));
}
/*==============================================================================
* fgetc()
*/
int fgetc(FILE *f)
{
uint8_t rx_size;
uint8_t rx_byte;
do {
rx_size = MSS_UART_get_rx(gp_my_uart, &rx_byte, 1);
} while(0u == rx_size);
return rx_byte;
}
/*==============================================================================
* ferror()
*/
int ferror(FILE *f)
{
/* Your implementation of ferror */
return EOF;
}
/*==============================================================================
* _ttywrch()
*/
void _ttywrch(int ch)
{
sendchar(ch);
}
/*==============================================================================
* _sys_exit()
*/
void _sys_exit(int return_code)
{
for(;;)
{
; /* endless loop */
}
}
#endif /* MICROSEMI_STDIO_THRU_UART */
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