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When debugging code it can be handy to examine/alter variables and to check the state of input lines. So your main program can run and you have access to alter variables and run functions from a terminal. In this sample the main program is just a loop that flashes an LED. In that loop a periodic call is made to ShellTC which handles any commands from the serial terminal. The code is a bit quirky(it was originally written for a very resource limited device) but it works well enough to be useful, hence its published. More details in the main.cpp
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Diff: sio.cpp
- Revision:
- 0:87e65dabdb95
- Child:
- 1:329a8125838a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/sio.cpp Thu Oct 25 21:57:40 2012 +0000 @@ -0,0 +1,141 @@ +/* Copyright (c) <year> <copyright holders>, MIT License + * + * Permission is hereby granted, free of charge, to any person obtaining a copy of this software + * and associated documentation files (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, publish, distribute, + * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all copies or + * substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING + * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +/* +sio handler august 96 +*/ +//(c)jont@ninelocks.com 1992-2012 +#include "string.h" +#include <stdio.h> +#include <ctype.h> + +#include "mbed.h" //fiddle + +#define XON 0x11 +#define XOFF 0x13 + + +//why do we end up defineing true and false + +#define combuffsize 16 +void sioRXHandler(void); +//horrible as this is platform depdndent but for now +Serial pc(USBTX, USBRX); // tx, rx + + +int commandWaiting; /* flag to indicate if data in buffer */ +char comBuff[combuffsize]; /* space for commands yeh its small make bigger if you need to */ +int comBuffIndex; /* buffer index */ +unsigned char JPORTOK0; + +void serialInit(void) +{ + JPORTOK0 = 0; + pc.attach(&sioRXHandler); + // pc.printf("Hello World!"); + +} + +/*======================================================================*/ +/* Get a character into our buffer */ +/*======================================================================*/ +/* read single character into command buffer */ +void sioGetSingle(void) +{ + + + +//char theChar; +char theChar = 0x00; //used to be a char... +//h8 theChar = SIO_RDR; /* get received character */ +//theChar = pc.getc(); +theChar = LPC_UART0->RBR; //oct2012 expereiment +// +//see this for reg names http://mbed.org/users/4180_1/notebook/cc-io-register-names/ + do { + } while ((LPC_UART0->LSR & 0x20)==0) ; +//write character to UART + LPC_UART0->THR = theChar ; + + //theChar = RCREG; //PIC + // theChar = 0x42; //TODO2k12 this needs to be whats read from sio RXREG + /* if an Xoff was received from + remote term telling us to stop... + in which case if anything other than an xon is receievd + we'll get caught as cant send due to xoff and cant get an irq + as were already in one */ + + switch(theChar) + { + case (XOFF): + JPORTOK0 = 0xff; ;break; /* busy */ + case (XON): + JPORTOK0 = 0x00; ;break; /* not busy */ + case ('?'): + comBuffIndex = 0; comBuff[0] ='\0'; + // printf("\n\r>?"); break; /* start of enq com */ + default: break; + } + + if (theChar != XON && theChar != XOFF && theChar != '?') + { + if (comBuffIndex >= combuffsize - 1) + { + comBuffIndex = combuffsize - 1; + } + +/* jt need to force upper case ?? also add set functions */ + comBuff[comBuffIndex] = toupper(theChar); + if (theChar == 0x0d) + { + comBuff[comBuffIndex] = '\0'; /* null terminate it */ + } + comBuffIndex++; /* inc index for next time */ + + /* we use to check for 2 chhars as well */ + if (theChar == 0x0d ) + { + commandWaiting = true; /* set flag */ + comBuffIndex = 0; + } + + } + +} + +///should normally be called by an irq that notices incoming characters +/*======================================================================*/ +/* sioRXHandler */ +/*======================================================================*/ +//used to work great for one character recived, but not with mbed, so lets see if its +//got multi characyters before it call the irq +void sioRXHandler(void) +{ + +//see http://mbed.org/forum/mbed/topic/3414/?page=1#comment-17231 + while (pc.readable() == 1){ + // jtdebug(); + sioGetSingle(); + uint32_t UART_0_RBR = LPC_UART0->RBR; + + } + //http://mbed.org/forum/mbed/topic/408/?page=1#comment-2221 + // pc.putc(0x00); + + uint32_t UART_0_RBR = LPC_UART0->RBR; + +}