1 | #define F_CPU 16000000UL
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2 |
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3 | #include <avr/io.h>
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4 | #include <avr/pgmspace.h>
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5 | #include <util/delay.h>
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6 |
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7 | #include "../../../libs/ps2_keyboard/ps2_keyboard.h"
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8 |
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9 | static volatile uint8_t key;
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10 |
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11 | const uint8_t at2xt[128] PROGMEM = {
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12 | // 0 1 2 3 4 5 6 7 8 9 A B C D E F
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13 | '?' ,0x43,'?' ,0x3F,0x3D,0x3B,0x3C,0x58,0x64,0x44,0x42,0x40,0x3E,0x0F,0x29,'?', // 0
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14 | 0x65,0x38,0x2A,0x70,0x1D,0x10,0x02,'?' ,0x66,0x71,0x2C,0x1F,0x1E,0x11,0x03,0x5B, // 1
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15 | 0x67,0x2E,0x2D,0x20,0x12,0x05,0x04,0x5C,0x68,0x39,0x2F,0x21,0x14,0x13,0x06,0x5D, // 2
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16 | 0x69,0x31,0x30,0x23,0x22,0x15,0x07,0x5E,0x6A,0x72,0x32,0x24,0x16,0x08,0x09,0x5F, // 3
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17 | 0x6B,0x33,0x25,0x17,0x18,0x0B,0x0A,0x6C,'?' ,0x34,0x35,0x26,0x27,0x19,0x0C,'?', // 4
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18 | 0x6D,0x73,0x28,0x74,0x1A,0x0D,'?' ,'?' ,0x3A,0x36,0x1C,0x1B,0x75,0x2B,0x63,0x76, // 5
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19 | '?' ,0x56,0x77,'?' ,0x79,'?' ,0x0E,0x7B,'?' ,0x4F,0x7D,0x4B,0x47,0x7E,'?' ,0x6F, // 6
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20 | 0x52,0x53,0x50,0x4C,0x4D,0x48,0x01,0x45,0x57,0x4E,0x51,0x4A,0x37,0x49,0x46,'?' // 7
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21 | };
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22 |
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23 | // 83 > 41 (F7)
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24 | // 84 > 54 (SysRq)
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25 |
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26 | void callback()
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27 | {
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28 | uint8_t key_code = 0;
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29 | key_code = read_char(); // TODO this function is blocking. Can it disturb main?
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30 |
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31 | key = pgm_read_byte(&(at2xt[key_code]));
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32 | if(release)
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33 | key |= 0x80;
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34 | }
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35 |
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36 |
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37 | int main() {
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38 | key = 0xAA;
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39 | init_keyboard(); // PS/2 KBD handler
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40 |
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41 | // PCW init - configure pins directions
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42 | PORTB = 0;
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43 | DDRB = 0; // PB2 and PB1 as inputs (floating)
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44 |
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45 | //debug LED - output
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46 | DDRD |= (1<<PD6);
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47 |
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48 | static const int PCLK = (1<<PB1);
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49 | static const int PDAT = (1<<PB2);
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50 |
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51 | uint8_t k;
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52 | while(1) {
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53 | while ((PINB & (PDAT|PCLK)) != (PDAT|PCLK))
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54 | ; // Wait for PC to be ready to receive data
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55 |
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56 | while(key == 0xFF)
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57 | ; // Wait for data to send
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58 |
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59 | PORTD ^= (1<<PD6);
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60 |
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61 | k = key; // local copy so we can receive another code from PS/2
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62 | // before we're done sending this one.
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63 | key = 0xFF;
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64 |
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65 | // SEND START BIT
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66 | DDRB &= ~PDAT; // DAT HI
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67 | _delay_us(50);
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68 | DDRB |= PCLK; // CLK LOW
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69 | _delay_us(50);
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70 | DDRB &= ~PCLK; // CLK HI
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71 |
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72 | for(int i = 0; i < 8; i++)
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73 | {
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74 | if (k & 1)
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75 | DDRB &= ~PDAT;
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76 | else
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77 | DDRB |= PDAT;
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78 |
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79 | _delay_us(50);
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80 | DDRB |= PCLK; // CLK LOW
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81 | _delay_us(50);
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82 | DDRB &= ~PCLK; // CLK HI
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83 |
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84 | k >>= 1;
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85 | }
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86 |
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87 | DDRB &= ~PDAT; // DAT HI
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88 |
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89 | _delay_us(100);
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90 | }
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91 |
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92 | return 0;
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93 | }
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94 |
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