| /* |
| * 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) |
| { |
| /* NOTE: SystemCoreClock should have been set before initialising UART. */ |
| CMSDK_UART0->BAUDDIV = SystemCoreClock / 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. */ |
| *lp = c; |
| lp++; /* Increment line pointer */ |
| cnt++; /* and count. */ |
| c = LF; |
| 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; |
| } |
| |
| void UartEndSimulation(int code) |
| { |
| UartPutc((char) 0x4); /* End of simulation */ |
| UartPutc((char) code); /* End of simulation */ |
| while(1); |
| } |