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1 | 6 | kaklik | /*! \file spieeprom.c \brief Interface for standard SPI EEPROM memories. */ |
2 | //***************************************************************************** |
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3 | // |
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4 | // File Name : 'spieeprom.c' |
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5 | // Title : Interface for standard SPI EEPROM memories |
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6 | // Author : Pascal Stang - Copyright (C) 2004 |
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7 | // Created : 2004.10.07 |
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8 | // Revised : 2004.10.07 |
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9 | // Version : 0.1 |
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10 | // Target MCU : Atmel AVR series |
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11 | // Editor Tabs : 4 |
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12 | // |
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13 | // This code is distributed under the GNU Public License |
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14 | // which can be found at http://www.gnu.org/licenses/gpl.txt |
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15 | // |
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16 | //***************************************************************************** |
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17 | |||
18 | #include <avr/io.h> |
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19 | #include <avr/interrupt.h> |
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20 | |||
21 | #include "spi.h" |
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22 | #include "spieeprom.h" |
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23 | |||
24 | // functions |
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25 | void spieepromInit(void) |
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26 | { |
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27 | // although there is no code here |
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28 | // don't forget to initialize the SPI interface itself |
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29 | // sbi(DDRB, 0); |
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30 | } |
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31 | |||
32 | u08 spieepromReadByte(u32 memAddr) |
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33 | { |
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34 | u08 data; |
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35 | // cbi(PORTB,0); |
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36 | // send command |
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37 | spiTransferByte(SPIEEPROM_CMD_READ); |
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38 | // send address |
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39 | spiTransferByte(memAddr>>8); |
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40 | spiTransferByte(memAddr&0x00FF); |
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41 | // read contents of memory address |
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42 | data = spiTransferByte(0xFF); |
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43 | // return data |
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44 | return data; |
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45 | // sbi(PORTB,0); |
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46 | } |
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47 | |||
48 | void spieepromWriteByte(u32 memAddr, u08 data) |
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49 | { |
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50 | // wait for any previous write to complete |
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51 | while(spieepromReadStatus() & SPIEEPROM_STATUS_WIP); |
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52 | |||
53 | // cbi(PORTB,0); |
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54 | // send command |
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55 | spiTransferByte(SPIEEPROM_CMD_WRITE); |
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56 | // send address |
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57 | spiTransferByte(memAddr>>8); |
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58 | spiTransferByte(memAddr&0x00FF); |
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59 | // send data to be written |
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60 | spiTransferByte(data); |
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61 | // sbi(PORTB,0); |
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62 | } |
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63 | |||
64 | void spieepromWriteEnable(void) |
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65 | { |
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66 | // cbi(PORTB,0); |
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67 | // send command |
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68 | spiTransferByte(SPIEEPROM_CMD_WREN); |
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69 | // sbi(PORTB,0); |
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70 | } |
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71 | |||
72 | void spieepromWriteDisable(void) |
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73 | { |
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74 | // cbi(PORTB,0); |
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75 | // send command |
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76 | spiTransferByte(SPIEEPROM_CMD_WRDI); |
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77 | // sbi(PORTB,0); |
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78 | } |
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79 | |||
80 | u08 spieepromReadStatus(void) |
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81 | { |
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82 | u08 status; |
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83 | // cbi(PORTB,0); |
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84 | // send command |
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85 | spiTransferByte(SPIEEPROM_CMD_RDSR); |
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86 | // get status register value |
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87 | status = spiTransferByte(0xFF); |
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88 | // sbi(PORTB,0); |
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89 | return status; |
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90 | } |
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