| 1 | #include "at29c040.h"
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| 2 |
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| 3 | #include <stdio.h>
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| 4 | #include <unistd.h>
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| 5 |
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| 6 |
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| 7 | AT29C040::AT29C040()
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| 8 | : Device()
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| 9 | {
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| 10 | }
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| 11 |
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| 12 | void AT29C040::power()
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| 13 | {
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| 14 | Device::write(CTRL, 0b10011111 | CTRLmask);
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| 15 | Device::write(VOLT, 0b11001000 | VOLTmask);
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| 16 | outb(port + 2, NONE);
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| 17 | }
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| 18 |
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| 19 | void Device::shutdown()
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| 20 | {
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| 21 | // All pins of the ROM are put either in high-Z, or 0V when it's not
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| 22 | // possible
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| 23 | Device::write(CTRL, 0b01100010);
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| 24 | Device::write(VOLT, 0b01111111);
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| 25 | outb(port + 2, NONE);
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| 26 | }
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| 27 |
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| 28 | void AT29C040::read(const char* filename)
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| 29 | {
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| 30 | if (!checkId()) {
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| 31 | return;
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| 32 | }
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| 33 | }
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| 34 |
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| 35 | void AT29C040::write(const char* filename)
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| 36 | {
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| 37 | if (!checkId()) {
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| 38 | return;
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| 39 | }
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| 40 | }
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| 41 |
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| 42 | void AT29C040::erase(void)
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| 43 | {
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| 44 | if (!checkId()) {
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| 45 | return;
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| 46 | }
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| 47 |
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| 48 | puts("Perfomring chip erase...");
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| 49 | }
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| 50 |
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| 51 | bool AT29C040::checkId(void)
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| 52 | {
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| 53 | // Chip enable
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| 54 | Device::write(CTRL, CTRLmask | WE | OE | CE | A17);
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| 55 | // Address bits low, WE = 1, CE = 0, OE = 1
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| 56 | // TC and TD = 1
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| 57 | Device::write(VOLT, VOLTmask);
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| 58 | // D and A OE = 0
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| 59 | // VPP config ?
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| 60 | // TA, TB, TE, TF = ?
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| 61 |
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| 62 | wr16(0x5555, 0xAA);
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| 63 | wr16(0xAAAA, 0x55);
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| 64 | wr16(0x5555, 0x90);
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| 65 |
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| 66 | // clear DOE for reading
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| 67 | Device::write(VOLT, DOE | VOLTmask);
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| 68 |
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| 69 | usleep(10000);
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| 70 |
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| 71 | // Read the result now
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| 72 | Device::write(ADR0, 0x00);
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| 73 | usleep(1000);
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| 74 | Device::write(ADR1, 0x00 ^ A13);
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| 75 | usleep(1000);
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| 76 | Device::write(CTRL, WE | A17 | CTRLmask);
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| 77 | usleep(1000);
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| 78 | uint8_t manufacturer = Device::read();
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| 79 |
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| 80 |
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| 81 | Device::write(CTRL, CE | OE | WE | A17 | CTRLmask);
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| 82 | usleep(1000);
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| 83 | Device::write(ADR0, 0x01);
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| 84 | usleep(1000);
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| 85 | Device::write(CTRL, WE | A17 | CTRLmask);
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| 86 | usleep(1000);
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| 87 |
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| 88 | uint8_t product = Device::read();
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| 89 |
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| 90 | Device::write(CTRL, CE | WE | OE | A17 | CTRLmask);
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| 91 | usleep(1000);
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| 92 | // re enable DOE, we are going to write again...
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| 93 | Device::write(VOLT, VOLTmask);
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| 94 | usleep(1000);
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| 95 |
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| 96 | wr16(0x5555, 0xAA);
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| 97 | wr16(0xAAAA, 0x55);
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| 98 | wr16(0x5555, 0xF0);
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| 99 | usleep(10000);
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| 100 |
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| 101 | // Chip disable - we're done !
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| 102 | Device::write(CTRL, 0xFF | CTRLmask);
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| 103 | usleep(1000);
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| 104 |
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| 105 | bool ok = (manufacturer == 0x1F && product == 0xA4);
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| 106 |
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| 107 | if (!ok)
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| 108 | {
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| 109 | fprintf(stderr, "Chip ID %X:%X does not match expected %X:%X\n",
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| 110 | manufacturer, product, 0x1F, 0xA4);
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| 111 | } else {
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| 112 | fprintf(stderr, "AT29C040 detected successfully!\n");
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| 113 | }
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| 114 |
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| 115 | return ok;
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| 116 | }
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