1 | void EPMP_Init(void)
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2 | {
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3 | /* Note: When using the EPMP to access external RAM or Flash, PMA0-PMA16 will only access a range of
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4 | 256K RAM. To increase this range enable higher Address lines.
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5 | */
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6 | ANSDbits.ANSD7 = 0; // PMD15
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7 | ANSDbits.ANSD6 = 0; // PMD14
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8 | ANSFbits.ANSF0 = 0; // PMD11
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9 |
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10 | ANSBbits.ANSB15 = 0; // PMA0
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11 | ANSBbits.ANSB14 = 0; // PMA1
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12 | ANSGbits.ANSG9 = 0; // PMA2
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13 | ANSBbits.ANSB13 = 0; // PMA10
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14 | ANSBbits.ANSB12 = 0; // PMA11
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15 | ANSBbits.ANSB11 = 0; // PMA12
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16 | ANSBbits.ANSB10 = 0; // PMA13
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17 | ANSAbits.ANSA7 = 0; // PMA17
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18 | ANSGbits.ANSG6 = 0; // PMA18
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19 |
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20 | PMCON1bits.ADRMUX = 0; // address is not multiplexed
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21 | PMCON1bits.MODE = 3; // master mode
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22 | PMCON1bits.CSF = 0; // PMCS1 pin used for chip select 1, PMCS2 pin used for chip select 2
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23 | PMCON1bits.ALP = 1; // set address latch strobes to high active level (for sn74lvc16373)
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24 | PMCON1bits.ALMODE = 1; // "smart" address strobes are not used
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25 | PMCON1bits.BUSKEEP = 0; // bus keeper is not used
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26 |
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27 | #if defined (GFX_EPMP_CS1_BASE_ADDRESS)
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28 | #ifdef USE_DOUBLE_BUFFERING
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29 | PMCS1BS = ((DWORD)GFX_BUFFER1>>8); // CS1 start address
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30 | PMCON3 |= 0x0003; // PMA16 - PMA17 address lines are enabled
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31 | #else
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32 | PMCS1BS = (GFX_EPMP_CS1_BASE_ADDRESS>>8); // CS1 start address
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33 | PMCON3 |= 0x0001; // PMA16 address line is enabled
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34 | #endif //USE_DOUBLE_BUFFERING
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35 |
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36 | PMCS1CFbits.CSDIS = 0; // enable CS
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37 | PMCS1CFbits.CSP = EPMPCS1_CS_POLARITY; // CS1 polarity
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38 | PMCS1CFbits.BEP = EPMPCS1_BE_POLARITY; // byte enable polarity
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39 | PMCS1CFbits.WRSP = EPMPCS1_WR_POLARITY; // write strobe polarity
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40 | PMCS1CFbits.RDSP = EPMPCS1_RD_POLARITY; // read strobe polarity
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41 | PMCS1CFbits.CSPTEN = 1; // enable CS port
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42 | PMCS1CFbits.SM = 0; // read and write strobes on separate lines
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43 | PMCS1CFbits.PTSZ = 2; // data bus width is 16-bit
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44 |
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45 | PMCS1MDbits.ACKM = 0; // PMACK is not used
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46 |
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47 | // The device timing parameters. Set the proper timing
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48 | // according to the device used (the timing macros are defined in the hardware profile)
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49 | PMCS1MDbits.DWAITB = EPMPCS1_DWAITB; // access time 1 Tcy
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50 | PMCS1MDbits.DWAITM = EPMPCS1_DWAITM;
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51 | PMCS1MDbits.DWAITE = EPMPCS1_DWAITE;
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52 | PMCS1MDbits.AMWAIT = EPMPCS1_AMWAIT; // Note: adjust this delay for slower devices
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53 |
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54 | #else
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55 | PMCS1CFbits.CSDIS = 1; // disable CS1 functionality
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56 | #endif //#if defined (GFX_EPMP_CS1_BASE_ADDRESS)
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57 |
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58 | #if defined (GFX_EPMP_CS2_BASE_ADDRESS)
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59 |
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60 | PMCS2BS = (GFX_EPMP_CS2_BASE_ADDRESS>>8); // CS2 start address
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61 |
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62 | PMCS2CFbits.CSDIS = 0; // enable CS
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63 |
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64 | PMCS2CFbits.CSP = EPMPCS2_CS_POLARITY; // CS2 polarity
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65 | PMCS2CFbits.BEP = EPMPCS2_BE_POLARITY; // byte enable polarity
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66 | PMCS2CFbits.WRSP = EPMPCS2_WR_POLARITY; // write strobe polarity
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67 | PMCS2CFbits.RDSP = EPMPCS2_RD_POLARITY; // read strobe polarity
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68 | PMCS2CFbits.CSPTEN = 1; // enable CS port
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69 | PMCS2CFbits.SM = 0; // read and write strobes on separate lines
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70 | PMCS2CFbits.PTSZ = 2; // data bus width is 16-bit
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71 |
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72 | PMCS2MDbits.ACKM = 0; // PMACK is not used
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73 |
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74 | // The device timing parameters. Set the proper timing
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75 | // according to the device used (the timing macros are defined in the hardware profile)
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76 | PMCS2MDbits.DWAITB = EPMPCS2_DWAITB; // access time 1 Tcy
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77 | PMCS2MDbits.DWAITM = EPMPCS2_DWAITM;
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78 | PMCS2MDbits.DWAITE = EPMPCS2_DWAITE;
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79 | PMCS2MDbits.AMWAIT = EPMPCS2_AMWAIT; // Note: adjust this delay for slower devices
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80 |
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81 |
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82 | #else
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83 | PMCS2CFbits.CSDIS = 1; // disable CS2 functionality
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84 | #endif //#if defined (GFX_EPMP_CS2_BASE_ADDRESS)
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85 |
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86 | PMCON2bits.RADDR = 0xFF; // set CS2 end address
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87 | PMCON4 = 0xFFFF; // PMA0 - PMA15 address lines are enabled
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88 |
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89 |
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90 | PMCON3bits.PTWREN = 1; // enable write strobe port
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91 | PMCON3bits.PTRDEN = 1; // enable read strobe port
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92 | PMCON3bits.PTBE0EN = 1; // enable byte enable port
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93 | PMCON3bits.PTBE1EN = 1; // enable byte enable port
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94 | PMCON3bits.AWAITM = 0; // set address latch pulses width to 1/2 Tcy
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95 | PMCON3bits.AWAITE = 0; // set address hold time to 1/4 Tcy
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96 |
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97 | DelayMs(100);
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98 |
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99 | PMCON2bits.MSTSEL = 3; // select EPMP bypass mode (for Graphics operation)
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100 | PMCON1bits.PMPEN = 1; // enable the module
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101 |
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102 | DelayMs(100);
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103 |
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104 | }
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