badge/ui/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 #ifdef R0KET
  10
  11 #include <r0ketports.h>
  12
  13 #define CS_LOW()   gpioSetValue(RB_LCD_CS , 0)
  14 #define CS_HIGH()  gpioSetValue(RB_LCD_CS , 1)
  15 #define RST_LOW()  gpioSetValue(RB_LCD_RST, 0)
  16 #define RST_HIGH() gpioSetValue(RB_LCD_RST, 1)
  17
  18 #else
  19
  20 #include <badge/pinconfig.h>
  21
  22 #define CS_LOW()   gpioSetValue(HOB_PORT(HOB_LCD_CS ), HOB_PIN(HOB_LCD_CS ), 0)
  23 #define CS_HIGH()  gpioSetValue(HOB_PORT(HOB_LCD_CS ), HOB_PIN(HOB_LCD_CS ), 1)
  24 #define RST_LOW()  gpioSetValue(HOB_PORT(HOB_LCD_RST), HOB_PIN(HOB_LCD_RST), 0)
  25 #define RST_HIGH() gpioSetValue(HOB_PORT(HOB_LCD_RST), HOB_PIN(HOB_LCD_RST), 1)
  26
  27 #endif
  28
  29 #ifdef CFG_USBMSC
  30 #include <core/usbhid-rom/usbmsc.h>
  31
  32 static uint32_t usbintstatus;
  33 #endif
  34
  35 static void lcd_select() {
  36 #ifdef CFG_USBMSC
  37   if(usbMSCenabled) {
  38     usbintstatus = USB_DEVINTEN;
  39     USB_DEVINTEN = 0;
  40   }
  41 #endif
  42
  43     /* the LCD requires 9-Bit frames */
  44   uint32_t configReg = ( SSP_SSP0CR0_DSS_9BIT     // Data size = 9-bit
  45                          | SSP_SSP0CR0_FRF_SPI    // Frame format = SPI
  46                          | SSP_SSP0CR0_SCR_8);    // Serial clock rate = 8
  47   SSP_SSP0CR0 = configReg;
  48
  49   CS_LOW();
  50 }
  51
  52 static void lcd_deselect() {
  53   CS_HIGH();
  54   /* reset the bus to 8-Bit frames that everyone else uses */
  55   uint32_t configReg = ( SSP_SSP0CR0_DSS_8BIT     // Data size = 8-bit
  56                          | SSP_SSP0CR0_FRF_SPI    // Frame format = SPI
  57                          | SSP_SSP0CR0_SCR_8);    // Serial clock rate = 8
  58   SSP_SSP0CR0 = configReg;
  59
  60 #ifdef CFG_USBMSC
  61   if(usbMSCenabled) {
  62     USB_DEVINTEN = usbintstatus;
  63   }
  64 #endif
  65 }
  66
  67 static inline void lcd_write(uint16_t frame) {
  68   while ((SSP_SSP0SR & (SSP_SSP0SR_TNF_NOTFULL | SSP_SSP0SR_BSY_BUSY)) != SSP_SSP0SR_TNF_NOTFULL);
  69   SSP_SSP0DR = frame;
  70   while ((SSP_SSP0SR & (SSP_SSP0SR_BSY_BUSY|SSP_SSP0SR_RNE_NOTEMPTY)) != SSP_SSP0SR_RNE_NOTEMPTY);
  71     /* clear the FIFO */
  72   frame = SSP_SSP0DR;
  73 }
  74
  75 static void lcd_write_command(uint8_t data) { lcd_write(         data); }
  76 static void lcd_write_data   (uint8_t data) { lcd_write(0x0100 | data); }
  77
  78 void badge_display_init(void) {
  79   sspInit(0, sspClockPolarity_Low, sspClockPhase_RisingEdge);
  80
  81   CS_HIGH();
  82   RST_HIGH();
  83
  84   systickDelay(100);
  85   RST_LOW();
  86   systickDelay(100);
  87   RST_HIGH();
  88   systickDelay(100);
  89   /*
  90   int id = lcdRead(220);
  91
  92   if(id == 14) {
  93     gpioSetDir(1, 7, gpioDirection_Output);
  94     gpioSetValue(1, 7, 1);
  95   }
  96   */
  97
  98 /* Small Nokia 1200 LCD docs:
  99  *           clear/ set
 100  *  on       0xae / 0xaf
 101  *  invert   0xa6 / 0xa7
 102  *  mirror-x 0xA0 / 0xA1
 103  *  mirror-y 0xc7 / 0xc8
 104  *
 105  *  0x20+x contrast (0=black - 0x2e)
 106  *  0x40+x offset in rows from top (-0x7f)
 107  *  0x80+x contrast? (0=black -0x9f?)
 108  *  0xd0+x black lines from top? (-0xdf?)
 109  *
 110  */
 111   lcd_select();
 112
 113   /* Decoded:
 114    * E2: Internal reset
 115    * AF: Display on/off: DON = 1
 116    * A1: undefined?
 117    * A4: all on/normal: DAL = 0
 118    * 2F: charge pump on/off: PC = 1
 119    * B0: set y address: Y[0-3] = 0
 120    * 10: set x address (upper bits): X[6-4] = 0
 121    */
 122   static uint8_t const initseq[]= { 0xE2, 0xAF, // Display ON
 123                                     0xA1,       // Mirror-X
 124                                     //0xc8, // mirror-y
 125                                     0xa7, // invert (1 = black)
 126                                     0xA4, 0x2F,
 127                                     // 0x9f, 0x24
 128                                     0xB0, 0x10,
 129   };
 130   for(uint8_t i = 0; i < sizeof(initseq); ++i){
 131     lcd_write_command(initseq[i]);
 132     systickDelay(5);
 133   }
 134
 135   lcd_deselect();
 136 }
 137
 138 void badge_framebuffer_flush(badge_framebuffer const *fb) {
 139   lcd_select();
 140
 141   lcd_write_command(0xb0);
 142   lcd_write_command(0x10);
 143   lcd_write_command(0x00);
 144
 145
 146   for(int i = 0; i < BADGE_DISPLAY_STRIPE_COUNT * BADGE_DISPLAY_WIDTH; ++i) {
 147     lcd_write_data(fb->data[0][i]);
 148   }
 149
 150   lcd_deselect();
 151 }