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/*
* Copyright (c) 2021 Arm Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "uart_stdout.h"
#include "device_mps3.h"
#include <stdio.h>
#define CNTLQ 0x11
#define CNTLS 0x13
#define DEL 0x7F
#define BACKSPACE 0x08
#define CR 0x0D
#define LF 0x0A
#define ESC 0x1B
void UartStdOutInit(void)
{
CMSDK_UART0->BAUDDIV = PERIF_CLK / 115200; /* => (25 or 32 MHz) / (115200 bps). */
CMSDK_UART0->CTRL = ((1ul << 0) | /* TX enable. */
(1ul << 1) ); /* RX enable. */
return;
}
unsigned char UartPutc(unsigned char my_ch)
{
while ((CMSDK_UART0->STATE & 1)); /* Wait if Transmit Holding register is full. */
if (my_ch == '\n') {
CMSDK_UART0->DATA = '\r';
while ((CMSDK_UART0->STATE & 1)); /* Wait if Transmit Holding register is full. */
}
CMSDK_UART0->DATA = my_ch; /* Write to transmit holding register. */
return (my_ch);
}
unsigned char UartGetc(void)
{
unsigned char my_ch;
unsigned int cnt;
/* Wait if Receive Holding register is empty. */
while (0 == (CMSDK_UART0->STATE & 2)) {
cnt = MPS3_FPGAIO->CLK100HZ / 50;
if (cnt & 0x8) {
MPS3_FPGAIO->LED = 0x01 << (cnt & 0x7);
}
else {
MPS3_FPGAIO->LED = 0x80 >> (cnt & 0x7);
}
}
my_ch = CMSDK_UART0->DATA;
/* Convert CR to LF. */
if(my_ch == '\r') {
my_ch = '\n';
}
return (my_ch);
}
bool GetLine(char *lp, unsigned int len)
{
unsigned int cnt = 0;
char c;
do {
c = UartGetc ();
switch (c) {
case CNTLQ: /* Ignore Control S/Q. */
case CNTLS:
break;
case BACKSPACE:
case DEL:
if (cnt == 0) {
break;
}
cnt--; /* Decrement count. */
lp--; /* Decrement line pointer. */
UartPutc (0x08); /* Echo backspace. */
UartPutc (' ');
UartPutc (0x08);
fflush (stdout);
break;
case ESC:
case 0:
*lp = 0; /* ESC - stop editing line. */
return false;
case CR: /* CR - done, stop editing line. */
UartPutc (*lp = c); /* Echo and store character. */
lp++; /* Increment line pointer */
cnt++; /* and count. */
c = LF;
UartPutc (*lp = c); /* Echo and store character. */
fflush (stdout);
lp++; /* Increment line pointer */
cnt++; /* and count. */
break;
default:
UartPutc (*lp = c); /* Echo and store character. */
fflush (stdout);
lp++; /* Increment line pointer */
cnt++; /* and count. */
break;
}
} while (cnt < len - 2 && c != LF); /* Check limit and CR. */
*lp = 0; /* Mark end of string. */
return true;
}
__attribute__((noreturn)) void UartEndSimulation(int code)
{
UartPutc((char) 0x4); /* End of simulation */
UartPutc((char) code); /* End of simulation */
while(1);
}
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