1 | /* Arduino SdFat Library
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2 | * Copyright (C) 2008 by William Greiman
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3 | *
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4 | * This file is part of the Arduino SdFat Library
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5 | *
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6 | * This Library is free software: you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation, either version 3 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This Library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 |
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with the Arduino SdFat Library. If not, see
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18 | * <http://www.gnu.org/licenses/>.
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19 | */
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20 | #ifndef SdFatUtil_h
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21 | #define SdFatUtil_h
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22 | /**
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23 | * \file
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24 | * Useful utility functions.
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25 | */
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26 | #include <Arduino.h>
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27 | #ifdef __AVR__
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28 | #include <avr/pgmspace.h>
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29 | /** Store and print a string in flash memory.*/
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30 | #define PgmPrint(x) SerialPrint_P(PSTR(x))
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31 | /** Store and print a string in flash memory followed by a CR/LF.*/
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32 | #define PgmPrintln(x) SerialPrintln_P(PSTR(x))
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33 | /** Defined so doxygen works for function definitions. */
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34 | #endif
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35 | #define NOINLINE __attribute__((noinline,unused))
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36 | #define UNUSEDOK __attribute__((unused))
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37 | //------------------------------------------------------------------------------
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38 | /** Return the number of bytes currently free in RAM. */
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39 | static UNUSEDOK int FreeRam(void) {
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40 | extern int __bss_end;
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41 | extern int* __brkval;
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42 | int free_memory;
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43 | if (reinterpret_cast<int>(__brkval) == 0) {
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44 | // if no heap use from end of bss section
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45 | free_memory = reinterpret_cast<int>(&free_memory)
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46 | - reinterpret_cast<int>(&__bss_end);
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47 | } else {
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48 | // use from top of stack to heap
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49 | free_memory = reinterpret_cast<int>(&free_memory)
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50 | - reinterpret_cast<int>(__brkval);
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51 | }
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52 | return free_memory;
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53 | }
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54 | #ifdef __AVR__
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55 | //------------------------------------------------------------------------------
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56 | /**
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57 | * %Print a string in flash memory to the serial port.
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58 | *
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59 | * \param[in] str Pointer to string stored in flash memory.
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60 | */
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61 | static NOINLINE void SerialPrint_P(PGM_P str) {
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62 | for (uint8_t c; (c = pgm_read_byte(str)); str++) Serial.write(c);
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63 | }
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64 | //------------------------------------------------------------------------------
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65 | /**
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66 | * %Print a string in flash memory followed by a CR/LF.
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67 | *
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68 | * \param[in] str Pointer to string stored in flash memory.
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69 | */
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70 | static NOINLINE void SerialPrintln_P(PGM_P str) {
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71 | SerialPrint_P(str);
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72 | Serial.println();
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73 | }
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74 | #endif // __AVR__
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75 | #endif // #define SdFatUtil_h
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