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1 /* |
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2 |
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3 u8x8_d_st7920.c |
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4 |
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5 Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) |
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6 |
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7 Copyright (c) 2016, olikraus@gmail.com |
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8 All rights reserved. |
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9 |
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10 Redistribution and use in source and binary forms, with or without modification, |
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11 are permitted provided that the following conditions are met: |
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12 |
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13 * Redistributions of source code must retain the above copyright notice, this list |
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14 of conditions and the following disclaimer. |
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15 |
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16 * Redistributions in binary form must reproduce the above copyright notice, this |
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17 list of conditions and the following disclaimer in the documentation and/or other |
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18 materials provided with the distribution. |
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19 |
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20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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21 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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22 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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23 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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24 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
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25 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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26 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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27 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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30 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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31 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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32 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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33 |
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34 |
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35 The ST7920 controller does not support hardware graphics flip. |
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36 Contrast adjustment is done by an external resistor --> no support for contrast adjustment |
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37 |
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38 |
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39 */ |
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40 #include "u8x8.h" |
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41 |
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42 |
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43 |
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44 static const uint8_t u8x8_d_st7920_init_seq[] = { |
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45 |
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46 U8X8_DLY(100), |
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47 U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */ |
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48 U8X8_DLY(10), |
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49 |
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50 U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */ |
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51 U8X8_C(0x008), /* display on, cursor & blink off; 0x08: all off */ |
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52 U8X8_C(0x006), /* Entry mode: Cursor move to right ,DDRAM address counter (AC) plus 1, no shift */ |
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53 U8X8_C(0x002), /* disable scroll, enable CGRAM adress */ |
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54 U8X8_C(0x001), /* clear RAM, needs 1.6 ms */ |
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55 U8X8_DLY(4), /* delay 2ms */ |
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56 |
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57 |
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58 U8X8_END_TRANSFER(), /* disable chip */ |
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59 U8X8_END() /* end of sequence */ |
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60 }; |
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61 |
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62 static const uint8_t u8x8_d_st7920_powersave0_seq[] = { |
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63 U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */ |
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64 U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */ |
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65 U8X8_C(0x00c), /* display on, cursor & blink off */ |
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66 U8X8_END_TRANSFER(), /* disable chip */ |
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67 U8X8_END() /* end of sequence */ |
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68 }; |
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69 |
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70 static const uint8_t u8x8_d_st7920_powersave1_seq[] = { |
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71 U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */ |
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72 U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */ |
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73 U8X8_C(0x008), /* display off */ |
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74 U8X8_C(0x034), /* 8 Bit interface (DL=1), extended instruction set (RE=1) */ |
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75 U8X8_C(0x001), /* Standby mode */ |
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76 |
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77 U8X8_END_TRANSFER(), /* disable chip */ |
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78 U8X8_END() /* end of sequence */ |
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79 }; |
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80 |
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81 |
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82 uint8_t u8x8_d_st7920_common(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) |
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83 { |
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84 uint8_t x, y, c, i; |
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85 uint8_t *ptr; |
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86 switch(msg) |
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87 { |
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88 /* U8X8_MSG_DISPLAY_SETUP_MEMORY is handled by the calling function */ |
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89 /* |
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90 case U8X8_MSG_DISPLAY_SETUP_MEMORY: |
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91 break; |
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92 */ |
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93 case U8X8_MSG_DISPLAY_INIT: |
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94 u8x8_d_helper_display_init(u8x8); |
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95 u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_init_seq); |
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96 break; |
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97 case U8X8_MSG_DISPLAY_SET_POWER_SAVE: |
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98 if ( arg_int == 0 ) |
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99 u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_powersave0_seq); |
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100 else |
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101 u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_powersave1_seq); |
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102 break; |
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103 case U8X8_MSG_DISPLAY_DRAW_TILE: |
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104 y = (((u8x8_tile_t *)arg_ptr)->y_pos); |
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105 y*=8; |
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106 x = ((u8x8_tile_t *)arg_ptr)->x_pos; |
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107 x /= 2; /* not sure whether this is a clever idea, problem is, the ST7920 can address only every second tile */ |
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108 |
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109 if ( y >= 32 ) /* this is the adjustment for 128x64 displays */ |
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110 { |
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111 y-=32; |
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112 x+=8; |
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113 } |
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114 |
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115 u8x8_cad_StartTransfer(u8x8); |
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116 |
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117 |
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118 /* |
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119 Tile structure is reused here for the ST7920, however u8x8 is not supported |
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120 tile_ptr points to data which has cnt*8 bytes (same as SSD1306 tiles) |
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121 Buffer is expected to have 8 lines of code fitting to the ST7920 internal memory |
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122 "cnt" includes the number of horizontal bytes. width is equal to cnt*8 |
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123 Also important: Width must be a multiple of 16 (ST7920 requirement), so cnt must be even. |
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124 |
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125 TODO: Consider arg_int, however arg_int is not used by u8g2 |
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126 */ |
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127 c = ((u8x8_tile_t *)arg_ptr)->cnt; /* number of tiles */ |
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128 ptr = ((u8x8_tile_t *)arg_ptr)->tile_ptr; /* data ptr to the tiles */ |
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129 /* The following byte is sent to allow the ST7920 to sync up with the data */ |
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130 /* it solves some issues with garbage data */ |
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131 u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode */ |
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132 u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode, issue 487 */ |
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133 for( i = 0; i < 8; i++ ) |
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134 { |
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135 //u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode */ |
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136 u8x8_cad_SendCmd(u8x8, 0x080 | (y+i) ); /* y pos */ |
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137 u8x8_cad_SendCmd(u8x8, 0x080 | x ); /* set x pos */ |
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138 c = ((u8x8_tile_t *)arg_ptr)->cnt; /* number of tiles */ |
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139 |
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140 //u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, 200, NULL); /* extra dely required */ |
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141 u8x8_cad_SendData(u8x8, c, ptr); /* note: SendData can not handle more than 255 bytes, send one line of data */ |
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142 ptr += c; |
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143 //u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, 200, NULL); /* extra dely required */ |
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144 } |
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145 |
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146 u8x8_cad_EndTransfer(u8x8); |
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147 |
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148 break; |
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149 default: |
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150 return 0; |
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151 } |
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152 return 1; |
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153 } |
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154 |
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155 static const u8x8_display_info_t u8x8_st7920_192x32_display_info = |
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156 { |
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157 /* chip_enable_level = */ 1, |
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158 /* chip_disable_level = */ 0, |
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159 |
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160 /* post_chip_enable_wait_ns = */ 5, |
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161 /* pre_chip_disable_wait_ns = */ 5, |
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162 /* reset_pulse_width_ms = */ 1, |
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163 /* post_reset_wait_ms = */ 6, |
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164 /* sda_setup_time_ns = */ 20, |
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165 /* sck_pulse_width_ns = */ 140, /* datasheet ST7920 */ |
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166 /* sck_clock_hz = */ 1000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be 1000000000/sck_pulse_width_ns */ |
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167 /* spi_mode = */ 3, /* old: sck_takeover_edge, new: active high (bit 1), rising edge (bit 0), 18 Aug 16: changed from 1 to 3 which works for 101 */ |
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168 /* Arduino mode 3: aktive low clock, but use rising edge */ |
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169 /* i2c_bus_clock_100kHz = */ 4, |
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170 /* data_setup_time_ns = */ 30, |
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171 /* write_pulse_width_ns = */ 40, |
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172 /* tile_width = */ 24, |
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173 /* tile_hight = */ 4, |
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174 /* default_x_offset = */ 0, |
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175 /* flipmode_x_offset = */ 0, |
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176 /* pixel_width = */ 192, |
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177 /* pixel_height = */ 32 |
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178 }; |
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179 |
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180 static const u8x8_display_info_t u8x8_st7920_128x64_display_info = |
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181 { |
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182 /* chip_enable_level = */ 1, |
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183 /* chip_disable_level = */ 0, |
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184 |
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185 /* post_chip_enable_wait_ns = */ 5, |
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186 /* pre_chip_disable_wait_ns = */ 5, |
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187 /* reset_pulse_width_ms = */ 1, |
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188 /* post_reset_wait_ms = */ 6, |
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189 /* sda_setup_time_ns = */ 20, |
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190 /* sck_pulse_width_ns = */ 140, /* datasheet ST7920 */ |
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191 /* sck_clock_hz = */ 1000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be 1000000000/sck_pulse_width_ns */ |
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192 /* ST7920+Due work with 1MHz but not with 2MHz, ST7920+Uno works with 2MHz */ |
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193 /* spi_mode = */ 3, /* active high, rising edge, 18 Aug 16: changed from 1 to 3 which works for 101 */ |
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194 /* in theory mode 3 should be correct */ |
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195 /* i2c_bus_clock_100kHz = */ 4, |
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196 /* data_setup_time_ns = */ 30, |
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197 /* write_pulse_width_ns = */ 40, |
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198 /* tile_width = */ 16, |
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199 /* tile_hight = */ 8, |
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200 /* default_x_offset = */ 0, |
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201 /* flipmode_x_offset = */ 0, |
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202 /* pixel_width = */ 128, |
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203 /* pixel_height = */ 64 |
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204 }; |
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205 |
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206 uint8_t u8x8_d_st7920_192x32(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) |
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207 { |
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208 switch(msg) |
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209 { |
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210 case U8X8_MSG_DISPLAY_SETUP_MEMORY: |
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211 u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7920_192x32_display_info); |
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212 break; |
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213 default: |
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214 return u8x8_d_st7920_common(u8x8, msg, arg_int, arg_ptr); |
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215 } |
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216 return 1; |
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217 } |
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218 |
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219 uint8_t u8x8_d_st7920_128x64(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) |
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220 { |
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221 switch(msg) |
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222 { |
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223 case U8X8_MSG_DISPLAY_SETUP_MEMORY: |
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224 u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7920_128x64_display_info); |
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225 break; |
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226 default: |
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227 return u8x8_d_st7920_common(u8x8, msg, arg_int, arg_ptr); |
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228 } |
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229 return 1; |
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230 } |
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231 |
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232 |
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233 |
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234 |
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235 |
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236 |