1 | #pragma config FOSC = INTOSC // Oscillator Selection (INTOSC oscillator: I/O function on CLKIN pin)
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2 | #pragma config WDTE = OFF // Watchdog Timer Enable (WDT enabled)
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3 | #pragma config PWRTE = OFF // Power-up Timer Enable (PWRT disabled)
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4 | #pragma config MCLRE = ON // MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
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5 | #pragma config CP = OFF // Flash Program Memory Code Protection (Program memory code protection is disabled)
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6 | #pragma config CPD = OFF // Data Memory Code Protection (Data memory code protection is disabled)
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7 | #pragma config BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled)
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8 | #pragma config CLKOUTEN = ON // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
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9 | #pragma config IESO = ON // Internal/External Switchover (Internal/External Switchover mode is enabled)
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10 | #pragma config FCMEN = ON // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is enabled)
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11 |
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12 | // CONFIG2
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13 | #pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off)
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14 | #pragma config PLLEN = OFF // PLL Enable (4x PLL enabled)
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15 | #pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset)
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16 | #pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
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17 | #pragma config LVP = ON
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18 |
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19 |
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20 | #include <xc.h>
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21 | #include <pic16f1828.h>
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22 | #include <stdint.h>
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23 |
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24 | #define SCK PORTBbits.RB6 //Serial Clock
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25 | #define SDI LATCbits.LATC4 //Serial Data In
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26 | #define SD0 PORTCbits.RC7 //Serial Data Out
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27 | #define SS LATCbits.LATC6 //Slave Select
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28 |
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29 |
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30 | #define SCK_dir TRISBbits.TRISB6
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31 | #define SDI_dir TRISBbits.TRISB4
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32 | #define SDO_dir TRISCbits.TRISC7
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33 | #define SS_dir TRISCbits.TRISC6
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34 |
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35 | // EEPROM SPI Instructions
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36 | #define WREN 0x06 //Write enable
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37 | #define WRDI 0x04 //Write disable
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38 | #define WRITE 0x02 //Write to Memory Array
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39 | #define READ 0x03 // Read from Memory Array
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40 | #define RDSR 0x05 // Read Status register
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41 |
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42 |
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43 | void SPI_initMaster();
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44 | void SPI_write(char data);
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45 | char SPI_read(char dummy);
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46 | void EEPROM_write(int address,char data);
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47 | char EEPROM_read(int address);
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48 | char EEPROM_status();
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49 | char EEPROM_busy();
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50 |
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51 | void main(void) {
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52 |
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53 |
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54 | OSCCONbits.SCS= 0b10; //internal Oscillator
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55 | OSCCONbits.IRCF=0b1011; //1MHz
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56 |
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57 |
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58 | int address = 0x0409;
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59 | SPI_initMaster();
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60 | EEPROM_read(address);
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61 |
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62 | return;
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63 | }
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64 |
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65 | void SPI_initMaster()
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66 | {
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67 |
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68 | SS_dir = 0;
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69 | SCK_dir = 0;
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70 | SDI_dir = 1;
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71 | SDO_dir = 0;
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72 |
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73 |
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74 | SSP1CON=0b00100000;
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75 | SSP1STAT=0b01000000;
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76 |
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77 |
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78 | }
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79 |
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80 | void SPI_write(char data)
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81 | {
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82 | SSP1BUF = data;
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83 | while(SSP1STATbits.BF== 0);
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84 |
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85 | }
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86 | //-----------------------------------------------------------------------------
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87 |
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88 | char SPI_read(char dummy)
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89 | {
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90 | SSP1BUF = dummy;
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91 | while(SSP1STATbits.BF== 0);
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92 | return SSP1BUF;
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93 | }
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94 |
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95 |
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96 | //------------------------------------------------------------------------------
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97 | char EEPROM_read(int address)
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98 | {
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99 |
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100 |
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101 | SS=0;
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102 | SPI_write(READ);
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103 | SPI_write(address>>8); //Upper Byte
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104 | SPI_write(address); //Lower Byte
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105 | char data = SPI_read(0);
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106 |
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107 |
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108 | SS=1;
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109 | return data;
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110 | }
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