root / branches / simulator / projects / libdragonfly / eeprom.c @ 1076
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1 | 891 | bcoltin | /**
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2 | * Copyright (c) 2007 Colony Project
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3 | *
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4 | * Permission is hereby granted, free of charge, to any person
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5 | * obtaining a copy of this software and associated documentation
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6 | * files (the "Software"), to deal in the Software without
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7 | * restriction, including without limitation the rights to use,
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8 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | * copies of the Software, and to permit persons to whom the
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10 | * Software is furnished to do so, subject to the following
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11 | * conditions:
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12 | *
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13 | * The above copyright notice and this permission notice shall be
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14 | * included in all copies or substantial portions of the Software.
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15 | *
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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18 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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23 | * OTHER DEALINGS IN THE SOFTWARE.
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24 | **/
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25 | |||
26 | |||
27 | /**
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28 | * @file eeprom.c
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29 | * @brief EEPROM Driver
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30 | *
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31 | * Implementation of functions for the EEPROM, including
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32 | * retrieving the robot's id from EEPROM.
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33 | *
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34 | * @author Colony Project, CMU Robotics Club
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35 | **/
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36 | |||
37 | 853 | bneuman | #include <avr/io.h> |
38 | #include "eeprom.h" |
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39 | |||
40 | int eeprom_put_byte(unsigned int uiAddress, unsigned char ucData) { |
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41 | /* Wait for completion of previous write */
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42 | while(EECR & (1<<EEWE)); |
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43 | /* Set up address and data registers */
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44 | EEAR = uiAddress; |
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45 | EEDR = ucData; |
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46 | /* Write logical one to EEMWE */
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47 | EECR |= (1<<EEMWE);
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48 | /* Start eeprom write by setting EEWE */
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49 | EECR |= (1<<EEWE);
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50 | |||
51 | return 0; |
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52 | } |
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53 | |||
54 | int eeprom_get_byte(unsigned int uiAddress, unsigned char *byte) { |
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55 | /* Wait for completion of previous write */
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56 | while(EECR & (1<<EEWE)); |
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57 | /* Set up address register */
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58 | EEAR = uiAddress; |
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59 | /* Start eeprom read by writing EERE */
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60 | EECR |= (1<<EERE);
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61 | /* get data from data register */
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62 | *byte=EEDR; |
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63 | |||
64 | return 0; |
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65 | } |
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66 | |||
67 | unsigned char get_robotid(void) { |
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68 | unsigned char ret; |
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69 | |||
70 | eeprom_get_byte(EEPROM_ROBOT_ID_ADDR, &ret); |
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71 | |||
72 | return ret;
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73 | 891 | bcoltin | } |