1 | #define SPI_CLK PB5
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2 | #define SPI_DATA PB3
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3 |
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4 | #define SPI_CLK_LOW() (PORTB &= ~(1<<PB5))
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5 | #define SPI_CLK_HIGH() (PORTB |= (1<<PB5))
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6 |
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7 | #define SPI_DATA_LOW() (PORTB &= ~(1<<PB3))
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8 | #define SPI_DATA_HIGH() (PORTB |= (1<<PB3))
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9 |
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10 | void display_plot(uint8_t x, uint8_t y)
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11 | {
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12 | // Set the x-axis area
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13 | softspi_command(SET_COLUMN_ADDRESS);
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14 | softspi_parameter(0x00);
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15 | softspi_parameter(x);
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16 | softspi_parameter(0x00);
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17 | softspi_parameter(0x7F);
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18 |
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19 | // Set the y-axis area
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20 | softspi_command(SET_PAGE_ADDRESS);
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21 | softspi_parameter(0x00);
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22 | softspi_parameter(y);
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23 | softspi_parameter(0x00);
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24 | softspi_parameter(0x7F);
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25 |
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26 | // Plot the point
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27 | softspi_command(WRITE_MEMORY_START);
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28 | softspi_parameter(100);
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29 | softspi_parameter(50);
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30 | }
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31 |
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32 | void display_init(void)
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33 | {
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34 | // Exit sleep mode, after this it needs a timeout to stabilize the circuit
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35 | loop_ms(7);
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36 | softspi_command(EXIT_SLEEP_MODE);
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37 | loop_ms(7);
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38 |
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39 | softspi_command(SET_PIXEL_FORMAT);
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40 | softspi_parameter(0x05);
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41 |
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42 | softspi_command(SET_GAMMA_CURVE);
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43 | softspi_parameter(0x04);
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44 |
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45 | softspi_command(GAM_R_SEL);
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46 | softspi_parameter(0x01);
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47 |
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48 | // Set the x-axis area
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49 | softspi_command(SET_COLUMN_ADDRESS);
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50 | softspi_parameter(0x00);
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51 | softspi_parameter(0x00);
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52 | softspi_parameter(0x00);
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53 | softspi_parameter(0x7F);
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54 |
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55 | // Set the y-axis area
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56 | softspi_command(SET_PAGE_ADDRESS);
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57 | softspi_parameter(0x00);
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58 | softspi_parameter(0x00);
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59 | softspi_parameter(0x00);
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60 | softspi_parameter(0x7F);
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61 |
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62 | // Select display orientation
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63 | softspi_command(SET_ADDRESS_MODE);
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64 | softspi_parameter(0x00);
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65 |
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66 | // Enable the display
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67 | softspi_command(SET_DISPLAY_ON);
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68 | softspi_command(WRITE_MEMORY_START);
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69 | }
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70 |
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71 | void softspi_command(uint16_t data)
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72 | {
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73 | DDRB |= (1<<SPI_DATA);
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74 | unsigned int i=0;
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75 |
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76 | // clear the D/CX bit, so that the controller take the byte as command byte
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77 | data &= ~(1<<8);
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78 |
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79 | for (i=9;i>0;i--)
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80 | {
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81 |
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82 | SPI_CLK_LOW(); //clock low
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83 |
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84 | if (data & 0x100) /* Wenn MSB-Bit gesetzt */
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85 | {
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86 | SPI_DATA_HIGH(); /* Data-Pin auf 1 schalten, */
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87 | }
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88 | else
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89 | {
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90 | SPI_DATA_LOW(); /* ansonsten auf 0 */
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91 | }
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92 | data = data << 1;
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93 |
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94 | SPI_CLK_HIGH(); //Clock bit rising edge
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95 | }
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96 |
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97 | SPI_CLK_LOW(); //CS high, übertragung beendet
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98 | }
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99 |
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100 |
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101 | void softspi_parameter(uint16_t data)
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102 | {
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103 | uint8_t counter=0;
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104 | DDRB |= (1<<SPI_DATA);
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105 | // Set the D/CX bit so that the controller use the byte as parameter
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106 | data |= (1<<8);
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107 |
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108 | for (counter=9;counter>0;counter--)
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109 | {
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110 |
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111 | SPI_CLK_LOW(); //clock low
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112 |
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113 | if (data & 0x100) /* If MSB-Bit set */
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114 | {
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115 | SPI_DATA_HIGH(); /* Data-Pin on 1 */
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116 | }
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117 | else
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118 | {
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119 | SPI_DATA_LOW(); /* else 0 */
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120 | }
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121 | data = data << 1;
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122 |
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123 | SPI_CLK_HIGH(); //Clock bit rising edge
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124 | }
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125 |
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126 | SPI_CLK_LOW(); //CS high, transmission finished
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127 | }
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128 |
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129 | int main(void)
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130 | {
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131 | display_init();
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132 | while(1)
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133 | {
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134 | display_plot(x,y);
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135 | }
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136 |
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137 |
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138 | }
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