tools/examples/lcd/tft/oscilloscope/main.c

   1 /**************************************************************************/
   2 /*!
   3     @file     main.c
   4     @author   K. Townsend (microBuilder.eu)
   5
   6     @section LICENSE
   7
   8     Software License Agreement (BSD License)
   9
  10     Copyright (c) 2011, microBuilder SARL
  11     All rights reserved.
  12
  13     Redistribution and use in source and binary forms, with or without
  14     modification, are permitted provided that the following conditions are met:
  15     1. Redistributions of source code must retain the above copyright
  16     notice, this list of conditions and the following disclaimer.
  17     2. Redistributions in binary form must reproduce the above copyright
  18     notice, this list of conditions and the following disclaimer in the
  19     documentation and/or other materials provided with the distribution.
  20     3. Neither the name of the copyright holders nor the
  21     names of its contributors may be used to endorse or promote products
  22     derived from this software without specific prior written permission.
  23
  24     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  25     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  26     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  28     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  29     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  31     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35 /**************************************************************************/
  36 #include <stdio.h>
  37
  38 #include "projectconfig.h"
  39 #include "sysinit.h"
  40
  41 #include "core/gpio/gpio.h"
  42 #include "core/adc/adc.h"
  43 #include "core/systick/systick.h"
  44
  45 #include "drivers/lcd/tft/lcd.h"
  46 #include "drivers/lcd/tft/drawing.h"
  47 #include "drivers/lcd/tft/touchscreen.h"
  48 #include "drivers/lcd/tft/fonts/dejavusans9.h"
  49 #include "drivers/lcd/tft/fonts/dejavusansbold9.h"
  50
  51 static uint8_t adcBuffer[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
  52 static uint8_t digBuffer[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
  53
  54 bool adcEnabled = true;
  55 bool digEnabled = false;
  56
  57 /**************************************************************************/
  58 /*!
  59     Renders the frame around the data grid
  60 */
  61 /**************************************************************************/
  62 void renderLCDFrame(void)
  63 {
  64   // Clear the screen
  65   drawFill(COLOR_DARKGRAY);
  66
  67   // Render V references
  68   drawString(245,  27, COLOR_BLACK, &dejaVuSansBold9ptFontInfo, "3.5V");
  69   drawString(244,  26, COLOR_WHITE, &dejaVuSansBold9ptFontInfo, "3.5V");
  70   drawString(245, 195, COLOR_BLACK, &dejaVuSansBold9ptFontInfo, "0.0V");
  71   drawString(244, 194, COLOR_WHITE, &dejaVuSansBold9ptFontInfo, "0.0V");
  72
  73   // Div settings
  74   drawString( 10, 10, COLOR_BLACK, &dejaVuSansBold9ptFontInfo, "~100ms/Div");
  75   drawString(  9,  9, COLOR_WHITE, &dejaVuSansBold9ptFontInfo, "~100ms/Div");
  76   drawString( 95, 10, COLOR_BLACK, &dejaVuSansBold9ptFontInfo, "500mV/Div");
  77   drawString( 94,  9, COLOR_WHITE, &dejaVuSansBold9ptFontInfo, "500mV/Div");
  78
  79   // Clear the ADC output level just in case
  80   drawRectangleFilled(175, 5, 250, 18, COLOR_DARKGRAY);
  81
  82   // Render the channel text
  83   drawString( 25, 220, COLOR_BLACK,  &dejaVuSansBold9ptFontInfo, "P1.4 (Analog)");
  84   drawString( 24, 219, adcEnabled ? COLOR_YELLOW : COLOR_MEDIUMGRAY, &dejaVuSansBold9ptFontInfo, "P1.4 (Analog)");
  85   drawString(135, 220, COLOR_BLACK,  &dejaVuSansBold9ptFontInfo, "P2.0 (Digital)");
  86   drawString(134, 219, digEnabled ? COLOR_GREEN : COLOR_MEDIUMGRAY, &dejaVuSansBold9ptFontInfo, "P2.0 (Digital)");
  87
  88   // ADC Warning
  89   drawString(245,  80, COLOR_BLACK, &dejaVuSansBold9ptFontInfo, "Warning:");
  90   drawString(244,  79, COLOR_WHITE, &dejaVuSansBold9ptFontInfo, "Warning:");
  91   drawString(244,  95, COLOR_WHITE, &dejaVuSans9ptFontInfo, "ADC input");
  92   drawString(244, 110, COLOR_WHITE, &dejaVuSans9ptFontInfo, "is not 5.0V");
  93   drawString(244, 125, COLOR_WHITE, &dejaVuSans9ptFontInfo, "tolerant!");
  94 }
  95
  96 /**************************************************************************/
  97 /*!
  98     Converts the supplied 8-bit value to an approximate pixel height in
  99     the data grid
 100 */
 101 /**************************************************************************/
 102 uint16_t adcValToPixel(uint8_t value)
 103 {
 104   // Since the chart is 175 pixels high and 3.3V is at
 105   // approximately 165 pixels height, we need to
 106   // divide the 8 bit ADC readings by 1.545 (255/165)
 107   // using fixed point math, and then substract
 108   // the number from the bottom of the frame
 109   uint16_t pixel = 0;
 110   pixel = 200 - (value * 1000 / 1545);
 111   return pixel;
 112 }
 113
 114 /**************************************************************************/
 115 /*!
 116     Redraws the grid and renders the data points on the LCD
 117 */
 118 /**************************************************************************/
 119 void renderLCDGrid(void)
 120 {
 121   if ((!adcEnabled) && (!digEnabled))
 122   {
 123     return;
 124   }
 125
 126   // Redraw the grid
 127   drawRectangle(9, 24, 236, 201, COLOR_LIGHTGRAY);
 128   drawRectangleFilled(10, 25, 235, 200, COLOR_BLACK);
 129
 130   // Horizontal lines
 131   drawLine(10,  50, 235,  50, COLOR_DARKERGRAY);
 132   drawLine(10,  75, 235,  75, COLOR_DARKERGRAY);
 133   drawLine(10, 100, 235, 100, COLOR_DARKERGRAY);
 134   drawLine(10, 125, 235, 125, COLOR_DARKERGRAY);
 135   drawLine(10, 150, 235, 150, COLOR_DARKERGRAY);
 136   drawLine(10, 175, 235, 175, COLOR_DARKERGRAY);
 137
 138   // Vertical lines
 139   drawLine( 35, 25,  35, 200, COLOR_DARKERGRAY);
 140   drawLine( 60, 25,  60, 200, COLOR_DARKERGRAY);
 141   drawLine( 85, 25,  85, 200, COLOR_DARKERGRAY);
 142   drawLine(110, 25, 110, 200, COLOR_DARKERGRAY);
 143   drawLine(135, 25, 135, 200, COLOR_DARKERGRAY);
 144   drawLine(160, 25, 160, 200, COLOR_DARKERGRAY);
 145   drawLine(185, 25, 185, 200, COLOR_DARKERGRAY);
 146   drawLine(210, 25, 210, 200, COLOR_DARKERGRAY);
 147
 148   // Render the individual data points
 149   uint32_t counter;
 150   for (counter = 0; counter < 9; counter++)
 151   {
 152     // Draw historical data
 153     uint32_t arrayPosition = 9 - counter;
 154
 155     // Draw analog data points (Yellow)
 156     if (adcEnabled)
 157     {
 158       drawLine(10 + counter * 25, adcValToPixel(adcBuffer[arrayPosition]), 10 + (counter + 1) * 25, adcValToPixel(adcBuffer[arrayPosition - 1]), COLOR_YELLOW);
 159     }
 160
 161     // Draw digital data points (Green)
 162     if (digEnabled)
 163     {
 164       drawLine(10 + counter * 25, adcValToPixel(digBuffer[arrayPosition]), 10 + (counter + 1) * 25, adcValToPixel(digBuffer[arrayPosition - 1]), COLOR_GREEN);
 165     }
 166   }
 167
 168   // Render ADC value in text if present
 169   if (adcEnabled)
 170   {
 171     char text[10];
 172     // Assuming 3.3V supply and 8-bit ADC values, 1 unit = 12.89mV (3300/256)
 173     sprintf(text, "%u.%u V", ((adcBuffer[0] * 1289) / 100) / 1000, ((adcBuffer[0] * 1294) / 100) % 1000);
 174     // Clear the previous text
 175     drawRectangleFilled(175, 5, 250, 18, COLOR_DARKGRAY);
 176     // Render the latest value in mV
 177     drawString(180, 10, COLOR_BLACK, &dejaVuSansBold9ptFontInfo, text);
 178     drawString(179,  9, COLOR_YELLOW, &dejaVuSansBold9ptFontInfo, text);
 179   }
 180 }
 181
 182 /**************************************************************************/
 183 /*!
 184     Shifts the buffer contents right one byte, and inserts the latest
 185     value at the beginning.
 186 */
 187 /**************************************************************************/
 188 void addToBuffer(uint8_t *buffer, uint8_t value)
 189 {
 190   uint32_t counter;
 191   for (counter = 9; counter > 0; counter--)
 192   {
 193     buffer[counter] = buffer[counter - 1];
 194   }
 195
 196   // Append the latest value
 197   buffer[0] = value;
 198 }
 199
 200 /**************************************************************************/
 201 /*!
 202     Main program entry point.  After reset, normal code execution will
 203     begin here.
 204 */
 205 /**************************************************************************/
 206 int main(void)
 207 {
 208   #if !defined CFG_TFTLCD
 209     #error "CFG_TFTLCD must be enabled in projectconfig.h for this test"
 210   #endif
 211   #if defined CFG_INTERFACE
 212     #error "CFG_INTERFACE must be disabled in projectconfig.h for this test (to save space)"
 213   #endif
 214
 215   // Configure cpu and mandatory peripherals
 216   systemInit();
 217
 218   /* Set P2.0 to GPIO input (just in case) */
 219   gpioSetDir(2, 0, 0);
 220
 221   /* Set P1.4/AD5 to analog input (only AD0..3 are configured by adcInit) */
 222   IOCON_PIO1_4 &= ~(IOCON_PIO1_4_ADMODE_MASK |
 223                     IOCON_PIO1_4_FUNC_MASK |
 224                     IOCON_PIO1_4_MODE_MASK);
 225   IOCON_PIO1_4 |=  (IOCON_PIO1_4_FUNC_AD5 &
 226                     IOCON_PIO1_4_ADMODE_ANALOG);
 227
 228   // Rotate the screen and render the area around the data grid
 229   lcdSetOrientation(LCD_ORIENTATION_LANDSCAPE);
 230   renderLCDFrame();
 231
 232   tsTouchData_t touch;
 233
 234   // Start reading
 235   while (1)
 236   {
 237     // Wait up to 5ms for a touch event
 238     tsTouchError_t error = tsWaitForEvent(&touch, 5);
 239     if (!error)
 240     {
 241       if (touch.x > 25 && touch.x < 100 && touch.y > 210)
 242       {
 243         // Analog switch selected
 244         adcEnabled = adcEnabled ? false : true;
 245       }
 246       if (touch.x > 125 && touch.x < 200 && touch.y > 210)
 247       {
 248         // Digital switch selected
 249         digEnabled = digEnabled ? false : true;
 250       }
 251       // Refresh the frame
 252       renderLCDFrame();
 253     }
 254
 255     // Read pins
 256     if (adcEnabled)
 257       addToBuffer(adcBuffer, adcRead(5) / 4); // 10-bit value converted to 8-bits
 258     if (digEnabled)
 259       addToBuffer(digBuffer, gpioGetValue(2, 0) ? 0xFF : 0x00);
 260
 261     // Update the LCD is required
 262     renderLCDGrid();
 263
 264     // Note, this will actually mean the timing is ~100mS + the amount of
 265     // time it took to get the readings and update the LCD
 266     // A timer interrupt could be used to get much more accurate results,
 267     // filling the buffer inside the IRQ and rendering the screen updates
 268     // every x milliseconds
 269     systickDelay(100);
 270   }
 271
 272   return 0;
 273 }