/* * File: Read ADC * Author: Bruce Land * * Target PIC: PIC32MX250F128B */ //////////////////////////////////// // clock AND protoThreads configure! // You MUST check this file! #include "config.h" // threading library #include "pt_cornell_1_2_1.h" //////////////////////////////////// // graphics libraries #include "tft_master.h" #include "tft_gfx.h" // need for rand function #include //////////////////////////////////// /* Demo code for interfacing TFT (ILI9340 controller) to PIC32 * The library has been modified from a similar Adafruit library */ // Adafruit data: /*************************************************** This is an example sketch for the Adafruit 2.2" SPI display. This library works with the Adafruit 2.2" TFT Breakout w/SD card ----> http://www.adafruit.com/products/1480 Check out the links above for our tutorials and wiring diagrams These displays use SPI to communicate, 4 or 5 pins are required to interface (RST is optional) Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! Written by Limor Fried/Ladyada for Adafruit Industries. MIT license, all text above must be included in any redistribution ****************************************************/ // string buffer char buffer[60]; // === thread structures ============================================ // thread control structs // note that UART input and output are threads static struct pt pt_timer, pt_adc ; // system 1 second interval tick int sys_time_seconds ; // === the fixed point macros ======================================== typedef signed int fix16 ; #define multfix16(a,b) ((fix16)(((( signed long long)(a))*(( signed long long)(b)))>>16)) //multiply two fixed 16:16 #define float2fix16(a) ((fix16)((a)*65536.0)) // 2^16 #define fix2float16(a) ((float)(a)/65536.0) #define fix2int16(a) ((int)((a)>>16)) #define int2fix16(a) ((fix16)((a)<<16)) #define divfix16(a,b) ((fix16)((((signed long long)(a)<<16)/(b)))) #define sqrtfix16(a) (float2fix16(sqrt(fix2float16(a)))) #define absfix16(a) abs(a) // === Timer Thread ================================================= // update a 1 second tick counter static PT_THREAD (protothread_timer(struct pt *pt)) { PT_BEGIN(pt); tft_setCursor(0, 0); tft_setTextColor(ILI9340_WHITE); tft_setTextSize(1); tft_writeString("Time in seconds since boot\n"); while(1) { // yield time 1 second PT_YIELD_TIME_msec(1000) ; sys_time_seconds++ ; // draw sys_time tft_fillRoundRect(0,10, 100, 14, 1, ILI9340_BLACK);// x,y,w,h,radius,color tft_setCursor(0, 10); tft_setTextColor(ILI9340_YELLOW); tft_setTextSize(1); sprintf(buffer,"%d", sys_time_seconds); tft_writeString(buffer); // NEVER exit while } // END WHILE(1) PT_END(pt); } // timer thread // === ADC Thread ============================================= // static PT_THREAD (protothread_adc(struct pt *pt)) { PT_BEGIN(pt); static int adc_9; static float V; static fix16 Vfix, ADC_scale ; ADC_scale = float2fix16(3.3/1023.0); //Vref/(full scale) while(1) { // yield time 1 second PT_YIELD_TIME_msec(60); // read the ADC AN11 // read the first buffer position adc_9 = ReadADC10(0); // read the result of channel 9 conversion from the idle buffer AcquireADC10(); // not needed if ADC_AUTO_SAMPLING_ON below // draw adc and voltage tft_fillRoundRect(0,100, 230, 15, 1, ILI9340_BLACK);// x,y,w,h,radius,color tft_setCursor(0, 100); tft_setTextColor(ILI9340_YELLOW); tft_setTextSize(2); // convert to voltage V = (float)adc_9 * 3.3 / 1023.0 ; // Vref*adc/1023 // convert to fixed voltage Vfix = multfix16(int2fix16(adc_9), ADC_scale) ; // print raw ADC, floating voltage, fixed voltage sprintf(buffer,"%d %6.3f %d.%03d", adc_9, V, fix2int16(Vfix), fix2int16(Vfix*1000)-fix2int16(Vfix)*1000); tft_writeString(buffer); // NEVER exit while } // END WHILE(1) PT_END(pt); } // animation thread // === Main ====================================================== void main(void) { //SYSTEMConfigPerformance(PBCLK); ANSELA = 0; ANSELB = 0; // === config threads ========== // turns OFF UART support and debugger pin, unless defines are set PT_setup(); // === setup system wide interrupts ======== INTEnableSystemMultiVectoredInt(); // the ADC /////////////////////////////////////// // configure and enable the ADC CloseADC10(); // ensure the ADC is off before setting the configuration // define setup parameters for OpenADC10 // Turn module on | ouput in integer | trigger mode auto | enable autosample // ADC_CLK_AUTO -- Internal counter ends sampling and starts conversion (Auto convert) // ADC_AUTO_SAMPLING_ON -- Sampling begins immediately after last conversion completes; SAMP bit is automatically set // ADC_AUTO_SAMPLING_OFF -- Sampling begins with AcquireADC10(); #define PARAM1 ADC_FORMAT_INTG16 | ADC_CLK_AUTO | ADC_AUTO_SAMPLING_OFF // // define setup parameters for OpenADC10 // ADC ref external | disable offset test | disable scan mode | do 1 sample | use single buf | alternate mode off #define PARAM2 ADC_VREF_AVDD_AVSS | ADC_OFFSET_CAL_DISABLE | ADC_SCAN_OFF | ADC_SAMPLES_PER_INT_1 | ADC_ALT_BUF_OFF | ADC_ALT_INPUT_OFF // // Define setup parameters for OpenADC10 // use peripherial bus clock | set sample time | set ADC clock divider // ADC_CONV_CLK_Tcy2 means divide CLK_PB by 2 (max speed) // ADC_SAMPLE_TIME_5 seems to work with a source resistance < 1kohm #define PARAM3 ADC_CONV_CLK_PB | ADC_SAMPLE_TIME_5 | ADC_CONV_CLK_Tcy2 //ADC_SAMPLE_TIME_15| ADC_CONV_CLK_Tcy2 // define setup parameters for OpenADC10 // set AN11 and as analog inputs #define PARAM4 ENABLE_AN11_ANA // pin 24 // define setup parameters for OpenADC10 // do not assign channels to scan #define PARAM5 SKIP_SCAN_ALL // use ground as neg ref for A | use AN11 for input A // configure to sample AN11 SetChanADC10( ADC_CH0_NEG_SAMPLEA_NVREF | ADC_CH0_POS_SAMPLEA_AN11 ); // configure to sample AN11 OpenADC10( PARAM1, PARAM2, PARAM3, PARAM4, PARAM5 ); // configure ADC using the parameters defined above EnableADC10(); // Enable the ADC /////////////////////////////////////////////////////// // init the threads PT_INIT(&pt_timer); PT_INIT(&pt_adc); // init the display tft_init_hw(); tft_begin(); tft_fillScreen(ILI9340_BLACK); //240x320 vertical display tft_setRotation(0); // Use tft_setRotation(1) for 320x240 // seed random color srand(1); // round-robin scheduler for threads while (1){ PT_SCHEDULE(protothread_timer(&pt_timer)); PT_SCHEDULE(protothread_adc(&pt_adc)); } } // main // === end ======================================================