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