lcd/display.c

   1 #include "display.h"
   2
   3 #include <core/ssp/ssp.h>
   4 #include <core/gpio/gpio.h>
   5 #include <core/systick/systick.h>
   6 #include <sysdefs.h>
   7 #include <lpc134x.h>
   8
   9 #include <r0ketports.h>
  10
  11 #ifdef CFG_USBMSC
  12 #include <core/usbhid-rom/usbmsc.h>
  13
  14 static uint32_t usbintstatus;
  15 #endif
  16
  17 static void lcd_select() {
  18 #ifdef CFG_USBMSC
  19   if(usbMSCenabled) {
  20     usbintstatus = USB_DEVINTEN;
  21     USB_DEVINTEN = 0;
  22   }
  23 #endif
  24
  25     /* the LCD requires 9-Bit frames */
  26   uint32_t configReg = ( SSP_SSP0CR0_DSS_9BIT     // Data size = 9-bit
  27                          | SSP_SSP0CR0_FRF_SPI    // Frame format = SPI
  28                          | SSP_SSP0CR0_SCR_8);    // Serial clock rate = 8
  29   SSP_SSP0CR0 = configReg;
  30   gpioSetValue(RB_LCD_CS, 0);
  31 }
  32
  33 static void lcd_deselect() {
  34   gpioSetValue(RB_LCD_CS, 1);
  35   /* reset the bus to 8-Bit frames that everyone else uses */
  36   uint32_t configReg = ( SSP_SSP0CR0_DSS_8BIT     // Data size = 8-bit
  37                          | SSP_SSP0CR0_FRF_SPI    // Frame format = SPI
  38                          | SSP_SSP0CR0_SCR_8);    // Serial clock rate = 8
  39   SSP_SSP0CR0 = configReg;
  40
  41 #ifdef CFG_USBMSC
  42   if(usbMSCenabled) {
  43     USB_DEVINTEN = usbintstatus;
  44   }
  45 #endif
  46 }
  47
  48 static inline void lcd_write(uint16_t frame) {
  49   while ((SSP_SSP0SR & (SSP_SSP0SR_TNF_NOTFULL | SSP_SSP0SR_BSY_BUSY)) != SSP_SSP0SR_TNF_NOTFULL);
  50   SSP_SSP0DR = frame;
  51   while ((SSP_SSP0SR & (SSP_SSP0SR_BSY_BUSY|SSP_SSP0SR_RNE_NOTEMPTY)) != SSP_SSP0SR_RNE_NOTEMPTY);
  52     /* clear the FIFO */
  53   frame = SSP_SSP0DR;
  54 }
  55
  56 static void lcd_write_command(uint8_t data) { lcd_write(         data); }
  57 static void lcd_write_data   (uint8_t data) { lcd_write(0x0100 | data); }
  58
  59 void badge_display_init(void) {
  60   sspInit(0, sspClockPolarity_Low, sspClockPhase_RisingEdge);
  61
  62   gpioSetValue(RB_LCD_CS , 1);
  63   gpioSetValue(RB_LCD_RST, 1);
  64
  65   gpioSetDir  (RB_LCD_CS , gpioDirection_Output);
  66   gpioSetDir  (RB_LCD_RST, gpioDirection_Output);
  67
  68   systickDelay(100);
  69   gpioSetValue(RB_LCD_RST, 0);
  70   systickDelay(100);
  71   gpioSetValue(RB_LCD_RST, 1);
  72   systickDelay(100);
  73   /*
  74   int id = lcdRead(220);
  75
  76   if(id == 14) {
  77     gpioSetDir(1, 7, gpioDirection_Output);
  78     gpioSetValue(1, 7, 1);
  79   }
  80   */
  81
  82 /* Small Nokia 1200 LCD docs:
  83  *           clear/ set
  84  *  on       0xae / 0xaf
  85  *  invert   0xa6 / 0xa7
  86  *  mirror-x 0xA0 / 0xA1
  87  *  mirror-y 0xc7 / 0xc8
  88  *
  89  *  0x20+x contrast (0=black - 0x2e)
  90  *  0x40+x offset in rows from top (-0x7f)
  91  *  0x80+x contrast? (0=black -0x9f?)
  92  *  0xd0+x black lines from top? (-0xdf?)
  93  *
  94  */
  95   lcd_select();
  96
  97   /* Decoded:
  98    * E2: Internal reset
  99    * AF: Display on/off: DON = 1
 100    * A1: undefined?
 101    * A4: all on/normal: DAL = 0
 102    * 2F: charge pump on/off: PC = 1
 103    * B0: set y address: Y[0-3] = 0
 104    * 10: set x address (upper bits): X[6-4] = 0
 105    */
 106   static uint8_t const initseq[]= { 0xE2, 0xAF, // Display ON
 107                                     //      0xA1,       // Mirror-X
 108                                     0xc8, // mirror-y
 109                                     0xa7, // invert (1 = black)
 110                                     0xA4, 0x2F,
 111                                     0xB0, 0x10,
 112                                     0x9f, 0x24 };
 113   for(uint8_t i = 0; i < sizeof(initseq); ++i){
 114     lcd_write_command(initseq[i]);
 115     systickDelay(5);
 116   }
 117
 118   lcd_deselect();
 119 }
 120
 121 void badge_framebuffer_flush(badge_framebuffer const *fb) {
 122   lcd_select();
 123
 124   lcd_write_command(0xb0);
 125   lcd_write_command(0x10);
 126   lcd_write_command(0x00);
 127
 128
 129   for(int i = 0; i < 9 * 96; ++i) {
 130     lcd_write_data(fb->data[0][i]);
 131   }
 132
 133   lcd_deselect();
 134 }