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1 /* Copyright (C) 2015 by Jacob Alexander
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2 *
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3 * This file is free software: you can redistribute it and/or modify
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4 * it under the terms of the GNU General Public License as published by
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5 * the Free Software Foundation, either version 3 of the License, or
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6 * (at your option) any later version.
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7 *
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8 * This file is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * You should have received a copy of the GNU General Public License
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14 * along with this file. If not, see <http://www.gnu.org/licenses/>.
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15 */
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16
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17 // ----- Includes -----
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18
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19 // Compiler Includes
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20 #include <Lib/ScanLib.h>
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21
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22 // Project Includes
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23 #include <cli.h>
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24 #include <led.h>
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25 #include <print.h>
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26
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27 // Local Includes
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28 #include "lcd_scan.h"
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29
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30
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31
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32 // ----- Defines -----
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33
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34 #define LCD_TOTAL_VISIBLE_PAGES 4
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35 #define LCD_PAGE_LEN 132
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36
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37
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38
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39 // ----- Macros -----
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40
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41 // Number of entries in the SPI0 TxFIFO
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42 #define SPI0_TxFIFO_CNT ( ( SPI0_SR & SPI_SR_TXCTR ) >> 12 )
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43
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44
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45
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46 // ----- Structs -----
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47
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48 // ----- Function Declarations -----
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49
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50 // CLI Functions
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51 void cliFunc_lcdCmd( char* args );
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52 void cliFunc_lcdInit( char* args );
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53 void cliFunc_lcdTest( char* args );
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54
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55
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56
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57 // ----- Variables -----
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58
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59 // Full Toggle State
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60 uint8_t cliFullToggleState = 0;
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61
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62 // Normal/Reverse Toggle State
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63 uint8_t cliNormalReverseToggleState = 0;
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64
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65 // Scan Module command dictionary
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66 CLIDict_Entry( lcdCmd, "Send byte via SPI, second argument enables a0. Defaults to control." );
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67 CLIDict_Entry( lcdInit, "Re-initialize the LCD display." );
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68 CLIDict_Entry( lcdTest, "Test out the LCD display." );
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69
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70 CLIDict_Def( lcdCLIDict, "ST LCD Module Commands" ) = {
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71 CLIDict_Item( lcdCmd ),
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72 CLIDict_Item( lcdInit ),
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73 CLIDict_Item( lcdTest ),
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74 { 0, 0, 0 } // Null entry for dictionary end
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75 };
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76
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77
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78
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79 // ----- Interrupt Functions -----
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80
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81
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82
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83 // ----- Functions -----
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84
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85 inline void SPI_setup()
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86 {
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87 // Enable SPI internal clock
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88 SIM_SCGC6 |= SIM_SCGC6_SPI0;
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89
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90 // Setup MOSI (SOUT) and SCLK (SCK)
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91 PORTC_PCR6 = PORT_PCR_DSE | PORT_PCR_MUX(2);
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92 PORTC_PCR5 = PORT_PCR_DSE | PORT_PCR_MUX(2);
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93
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94 // Setup SS (PCS)
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95 PORTC_PCR4 = PORT_PCR_DSE | PORT_PCR_MUX(2);
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96
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97 // Master Mode, CS0
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98 SPI0_MCR = SPI_MCR_MSTR | SPI_MCR_PCSIS(1);
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99
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100 // DSPI Clock and Transfer Attributes
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101 // Frame Size: 8 bits
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102 // MSB First
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103 // CLK Low by default
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104 SPI0_CTAR0 = SPI_CTAR_FMSZ(7)
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105 | SPI_CTAR_ASC(7)
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106 | SPI_CTAR_DT(7)
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107 | SPI_CTAR_CSSCK(7)
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108 | SPI_CTAR_PBR(0) | SPI_CTAR_BR(7);
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109 }
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110
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111 // Write buffer to SPI FIFO
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112 void SPI_write( uint8_t *buffer, uint8_t len )
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113 {
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114
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115 for ( uint8_t byte = 0; byte < len; byte++ )
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116 {
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117 // Wait for SPI TxFIFO to have 4 or fewer entries
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118 while ( !( SPI0_SR & SPI_SR_TFFF ) )
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119 delayMicroseconds(10);
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120
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121 // Write byte to TxFIFO
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122 // CS0, CTAR0
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123 SPI0_PUSHR = ( buffer[ byte ] & 0xff ) | SPI_PUSHR_PCS(1);
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124
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125 // Indicate transfer has completed
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126 while ( !( SPI0_SR & SPI_SR_TCF ) );
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127 SPI0_SR |= SPI_SR_TCF;
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128 }
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129 }
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130
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131 // Write to a control register
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132 void LCD_writeControlReg( uint8_t byte )
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133 {
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134 // Wait for TxFIFO to be empt
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135 while ( SPI0_TxFIFO_CNT != 0 );
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136
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137 // Set A0 low to enter control register mode
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138 GPIOC_PCOR |= (1<<7);
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139
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140 // Write byte to SPI FIFO
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141 SPI_write( &byte, 1 );
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142
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143 // Wait for TxFIFO to be empty
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144 while ( SPI0_TxFIFO_CNT != 0 );
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145
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146 // Make sure data has transferred
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147 delayMicroseconds(10); // XXX Adjust if SPI speed changes
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148
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149 // Set A0 high to go back to display register mode
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150 GPIOC_PSOR |= (1<<7);
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151 }
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152
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153 // Write to display register
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154 // Pages 0-7 normal display
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155 // Page 8 icon buffer
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156 void LCD_writeDisplayReg( uint8_t page, uint8_t *buffer, uint8_t len )
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157 {
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158 // Set the register page
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159 LCD_writeControlReg( 0xB0 | ( 0x0F & page ) );
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160
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161 // Write buffer to SPI
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162 SPI_write( buffer, len );
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163 }
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164
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165 inline void LCD_clearPage( uint8_t page )
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166 {
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167 // Set the register page
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168 LCD_writeControlReg( 0xB0 | ( 0x0F & page ) );
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169
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170 // Set display start line
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171 LCD_writeControlReg( 0x40 );
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172
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173 // Reset Column Address
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174 LCD_writeControlReg( 0x10 );
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175 LCD_writeControlReg( 0x00 );
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176
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177 for ( uint8_t page_reg = 0; page_reg < LCD_PAGE_LEN; page_reg++ )
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178 {
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179 uint8_t byte = 0;
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180
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181 // Write buffer to SPI
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182 SPI_write( &byte, 1 );
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183 }
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184
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185 // Wait for TxFIFO to be empty
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186 while ( SPI0_TxFIFO_CNT != 0 );
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187 }
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188
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189 // Clear Display
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190 void LCD_clear()
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191 {
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192 // Setup each page
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193 for ( uint8_t page = 0; page < LCD_TOTAL_VISIBLE_PAGES; page++ )
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194 {
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195 LCD_clearPage( page );
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196 }
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197
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198 // Reset Page, Start Line, and Column Address
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199 // Page
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200 LCD_writeControlReg( 0xB0 );
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201
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202 // Start Line
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203 LCD_writeControlReg( 0x40 );
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204
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205 // Reset Column Address
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206 LCD_writeControlReg( 0x10 );
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207 LCD_writeControlReg( 0x00 );
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208 }
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209
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210 // Intialize display
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211 void LCD_initialize()
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212 {
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213 // ADC Select (Normal)
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214 LCD_writeControlReg( 0xA0 );
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215
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216 // LCD Off
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217 LCD_writeControlReg( 0xAE );
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218
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219 // COM Scan Output Direction
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220 LCD_writeControlReg( 0xC0 );
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221
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222 // LCD Bias (1/6 bias)
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223 LCD_writeControlReg( 0xA2 );
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224
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225 // Power Supply Operating Mode (Internal Only)
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226 LCD_writeControlReg( 0x2F );
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227
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228 // Internal Rb/Ra Ratio
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229 LCD_writeControlReg( 0x26 );
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230
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231 // Reset
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232 LCD_writeControlReg( 0xE2 );
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233
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234 // Electric volume mode set, and value
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235 LCD_writeControlReg( 0x81 );
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236 LCD_writeControlReg( 0x00 );
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237
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238 // LCD On
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239 LCD_writeControlReg( 0xAF );
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240
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241 // Clear Display RAM
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242 LCD_clear();
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243 }
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244
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245 // Setup
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246 inline void LCD_setup()
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247 {
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248 // Register Scan CLI dictionary
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249 CLI_registerDictionary( lcdCLIDict, lcdCLIDictName );
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250
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251 // Initialize SPI
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252 SPI_setup();
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253
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254
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255 // Setup Register Control Signal (A0)
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256 // Start in display register mode (1)
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257 GPIOC_PDDR |= (1<<7);
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258 PORTC_PCR7 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1);
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259 GPIOC_PSOR |= (1<<7);
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260
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261 // Setup LCD Reset pin (RST)
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262 // 0 - Reset, 1 - Normal Operation
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263 // Start in normal mode (1)
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264 GPIOC_PDDR |= (1<<8);
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265 PORTC_PCR8 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1);
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266 GPIOC_PSOR |= (1<<8);
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267
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268 // Run LCD intialization sequence
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269 LCD_initialize();
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270 }
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271
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272
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273 // LCD State processing loop
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274 inline uint8_t LCD_scan()
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275 {
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276 // NOP - Screen Refresh
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277 //LCD_writeControlReg( 0xE3 );
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278 return 0;
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279 }
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280
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281
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282
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283 // ----- CLI Command Functions -----
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284
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285 void cliFunc_lcdInit( char* args )
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286 {
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287 print( NL ); // No \r\n by default after the command is entered
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288 LCD_initialize();
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289 }
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290
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291 void cliFunc_lcdTest( char* args )
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292 {
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293 print( NL ); // No \r\n by default after the command is entered
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294
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295 //LCD_initialize();
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296 // Test pattern
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297 uint8_t pattern[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
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298 //uint8_t pattern[] = { 0xFF, 0x00, 0x96, 0xFF, 0x00, 0xFF, 0x00 };
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299
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300 // Write to page D0
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301 LCD_writeDisplayReg( 0, pattern, sizeof( pattern ) );
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302 }
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303
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304 void cliFunc_lcdCmd( char* args )
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305 {
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306 char* curArgs;
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307 char* arg1Ptr;
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308 char* arg2Ptr = args;
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309
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310 print( NL ); // No \r\n by default after the command is entered
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311
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312 curArgs = arg2Ptr; // Use the previous 2nd arg pointer to separate the next arg from the list
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313 CLI_argumentIsolation( curArgs, &arg1Ptr, &arg2Ptr );
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314
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315 // No args
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316 if ( *arg1Ptr == '\0' )
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317 return;
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318
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319 // SPI Command
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320 uint8_t cmd = (uint8_t)numToInt( arg1Ptr );
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321
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322 curArgs = arg2Ptr; // Use the previous 2nd arg pointer to separate the next arg from the list
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323 CLI_argumentIsolation( curArgs, &arg1Ptr, &arg2Ptr );
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324
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325 // Single Arg
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326 if ( *arg1Ptr == '\0' )
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327 goto cmd;
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328
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329 // TODO Deal with a0
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330 cmd:
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331 info_msg("Sending - ");
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332 printHex( cmd );
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333 print( NL );
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334 LCD_writeControlReg( cmd );
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335 }
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336
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