Electric Locomotive control system. Touch screen driver control, includes regenerative braking, drives 4 brushless motors, displays speed MPH, system volts and power
Dependencies: BSP_DISCO_F746NG FastPWM LCD_DISCO_F746NG SD_DISCO_F746NG TS_DISCO_F746NG mbed
main.cpp
- Committer:
- JonFreeman
- Date:
- 2017-11-12
- Revision:
- 0:23cc72b18e74
- Child:
- 1:8ef34deb5177
File content as of revision 0:23cc72b18e74:
// Electric Locomotive Controller // Jon Freeman B. Eng Hons // Last Updated 12 April 2017 // Touch Screen Loco 2017 - WITH SD card data logger functions // This code runs on STM 32F746NG DISCO module, high performance ARM Cortex with touch screen // ffi on ST module -> https://developer.mbed.org/platforms/ST-Discovery-F746NG/ // Board plugs onto simple mother-board containing low voltage power supplies, interfacing buffers, connectors etc. // See www.jons-workshop.com ffi on hardware. // Design provides PWM outputs to drive up to four brushless motor drive modules, each able to return speed information. // Output signals are dual PWM, one to set max motor voltage, other to set max motor current. // This code as supplied uses current control to drive locomotive. This means that drive fader acts as a Torque, not Speed, Demand control. // Regenerative braking is included in the design. // NOTE that when braking, the motor supply rail voltage will be lifted. Failure to design-in some type of 'surplus power dump' // may result in over-voltage damage to batteries or power electronics. #include "mbed.h" #include "FastPWM.h" #include "TS_DISCO_F746NG.h" #include "LCD_DISCO_F746NG.h" #include "SD_DISCO_F746NG.h" #include "dro.h" // Design Topology // This F746NG is the single loco control computer. // Assumed 4 motor controllers driven from same signal set via multiple opto / buffers // Outputs are : - // FastPWM maxv on D12 - in drive, sets motor volts to pwm proportion of available volts. Also used in regen braking // FastPWM maxi on D11 - used to set upper bound on motor current, used as analogue out to set current limit on motor driver // DigitalOut reverse (D7) - D6,7 select fwd, rev, brake, parking brake // DigitalOut forward (D6) // Inputs are : - // AnalogIn ht_amps_ain (A0); // Jan 2017 // AnalogIn ht_volts_ain (A1); // Jan 2017 // InterruptIn mot4hall (D2); // InterruptIn mot3hall (D3); // InterruptIn mot2hall (D4); // InterruptIn mot1hall (D5); /* Feb 2017, re-thought use of FR and SG signals. Rename these FWD and REV. Truth table for actions required now : - FWD(A5) REV(A4) PWM Action 0 0 0 'Handbrake' - energises motor to not move 0 0 1 'Handbrake' - energises motor to not move 0 1 0 Reverse0 0 1 1 Reverse1 1 0 0 Forward0 1 0 1 Forward1 1 1 0 Regen Braking 1 1 1 Regen Braking */ LCD_DISCO_F746NG lcd; TS_DISCO_F746NG touch_screen; SD_DISCO_F746NG sd; FastPWM maxv (D12, 1), maxi (D11, 1); // pin, prescaler value Serial pc (USBTX, USBRX); // Comms to 'PuTTY' or similar comms programme on pc DigitalOut reverse_pin (D7); // DigitalOut forward_pin (D6); //these two decode to fwd, rev, regen_braking and park DigitalOut GfetT2 (D14); // a horn DigitalOut GfetT1 (D15); // another horn DigitalOut led_grn (LED1); // the only on board user led DigitalIn f_r_switch (D0); // Reads position of centre-off ignition switch DigitalIn spareio_d8 (D8); DigitalIn spareio_d9 (D9); DigitalIn spareio_d10 (D10); // D8, D9, D10 wired to jumper on pcb - not used to Apr 2017 AnalogIn ht_volts_ain (A0); // Jan 2017 AnalogIn ht_amps_ain (A1); // Jan 2017 AnalogIn spare_ain2 (A2); AnalogIn spare_ain3 (A3); AnalogIn spare_ain4 (A4); // hardware on pcb for these 3 spare analogue inputs - not used to Apr 2017 //AnalogIn spare_ain5 (A5); // causes display flicker ! InterruptIn mot4hall (D2); // One Hall sensor signal from each motor fed back to measure speed InterruptIn mot3hall (D3); InterruptIn mot2hall (D4); InterruptIn mot1hall (D5); extern int get_button_press (struct point & pt) ; extern void displaytext (int x, int y, const int font, uint32_t BCol, uint32_t TCol, char * txt) ; extern void displaytext (int x, int y, const int font, char * txt) ; extern void displaytext (int x, int y, char * txt) ; extern void setup_buttons () ; extern void draw_numeric_keypad (int colour) ; extern void draw_button_hilight (int bu, int colour) ; extern void read_presses (int * a) ; extern void read_keypresses (struct ky_bd & a) ; extern void SliderGraphic (struct slide & q) ; extern void vm_set () ; extern void update_meters (double, double, double) ; extern void command_line_interpreter () ; static const int NUMBER_OF_MOTORS = 4, SD_BLOCKSIZE = 512, /* SD card data Block Size in Bytes */ DAMPER_DECAY = 42, // Small num -> fast 'viscous damper' on dead-mans function with finger removed from panel MAF_PTS = 140, // Moving Average Filter points PWM_HZ = 13000, // PWM_HZ = 2000, // Used this to experiment on much bigger motor MAX_PWM_TICKS = 108000000 / PWM_HZ, // 108000000 for F746N, due to cpu clock = 216 MHz FWD = 0, REV = ~FWD; static const double MOTOR_PINION_T = 17.0, // motor pinion teeth, wheel gear teeth and wheel dia required to calculate speed and distance. WHEEL_GEAR_T = 76.0, WHEEL_DIA_MM = 147.0, WHEEL_CIRCUMFERENCE_METRE = PI * WHEEL_DIA_MM / 1000.0, PULSES_PER_WHEEL_REV = 32.0 * WHEEL_GEAR_T / MOTOR_PINION_T, PULSES_PER_METRE = PULSES_PER_WHEEL_REV / WHEEL_CIRCUMFERENCE_METRE, rpm2mph = 60.0 // = Motor Revs per hour; * (MOTOR_PINION_T / WHEEL_GEAR_T) // = Wheel rev per hour * WHEEL_CIRCUMFERENCE_METRE // = metres per hour * 39.37 // = inches per hour / (1760 * 36) // = miles per hour ; // Assume SD card size is 4Gbyte, might be 8 Gbyte // Then can use 8388608 blocks (8 * 1024 * 1024) uint64_t SD_blockptr = 0; uint32_t SDBuffer[(SD_BLOCKSIZE >> 2)]; // = space for (512 / 4) uint32_t uint8_t SD_state = SD_OK, sd_jf = 0; static const uint64_t GIGAB = 1024 * 1024 * 1024; //static const uint64_t SDBLOCKS = (GIGAB / SD_BLOCKSIZE) * 4; // software drives SD up to 4Gbyte only - 8 M block static const uint64_t SDBLOCKS = (GIGAB / SD_BLOCKSIZE) * 2; // software drives SD up to 4Gbyte only - 8 M block // If data logger takes 2 minutes to fill 1 block, a 4G card takes 32 years run-time to fill // If system generates approx 320 pulses per metre travelled, max distance recordable in uint32_t is 65536 * 65536 / 320 = 13421.772 km //from dro.h struct slide { int position; int oldpos; int state; int direction; bool recalc_run; bool handbrake_slipping; double handbrake_effort; double loco_speed } ; struct slide slider ; //static const double mph_2_mm_per_sec = 447.04; // exact int V_maf[MAF_PTS + 2], I_maf[MAF_PTS + 2], maf_ptr = 0; //uint32_t Hall_pulse[8] = {0,0,0,0,0,0,0,0}; // more than max number of motors uint32_t Hall_pulse[8] = {1,1,1,1,1,1,1,1}; // more than max number of motors uint32_t historic_distance = 0; bool qtrsec_trig = false; bool trigger_current_read = false; volatile bool trigger_32ms = false; double last_pwm = 0.0; bool sd_error () { // Test and Clear error code sd_jf, return true if any error bits set, false on 0 bool retval = false; if (sd_jf != 0) { retval = true; sd_jf = 0; } return retval; } bool check_SD_block_clear (uint32_t block) { uint32_t b[(SD_BLOCKSIZE >> 2)]; SD_state = sd.ReadBlocks(b, (uint64_t)(SD_BLOCKSIZE * block), SD_BLOCKSIZE, 1); if(SD_state != SD_OK) { sd_jf = 1; pc.printf ("Failed, not SD_OK, erasing block %d\r\n", block); return false; } for (int i = 0; i < (SD_BLOCKSIZE >> 2); i++) if (b[i] != 0) return false; return true; } /*bool erase_block (uint32_t block2erase) { uint64_t addr = SD_BLOCKSIZE * (uint64_t)block2erase; SD_state = sd.Erase(addr, addr + SD_BLOCKSIZE); if (SD_state != SD_OK) { sd_jf = 1; // Assert error flag pc.printf ("Failed, not SD_OK, erasing block %d\r\n", block2erase); return false; } return check_SD_block_clear (block2erase); }*/ bool SD_find_next_clear_block (uint64_t * blok) { // Successive approximation algorithm to quickly find next vacant SD card 512 byte block uint64_t toaddsub = SDBLOCKS / 2, stab = SDBLOCKS - 1; pc.printf ("At SD_find_next_clear_block \r\n"); while (toaddsub) { pc.printf ("stab = %lld, toadsub = %lld\r\n", stab, toaddsub); // lld for long long int bool clear_block = true; SD_state = sd.ReadBlocks(SDBuffer, SD_BLOCKSIZE * stab, SD_BLOCKSIZE, 1); if(SD_state != SD_OK) { sd_jf = 1; pc.printf ("SD error in SD_find_next_clear_block, returning -1\r\n"); return false; } for (int i = 0; i < (SD_BLOCKSIZE >> 2); i++) { if (SDBuffer[i] != 0) { clear_block = false; pc.printf ("Buff at %d contains %x\r\n", i, SDBuffer[i]); i = SD_BLOCKSIZE; // to exit loop } } if (clear_block) stab -= toaddsub; else stab += toaddsub; toaddsub >>= 1; } if (!check_SD_block_clear(stab)) stab++; if (sd_error()) { // sd_error() tests and clears error bits pc.printf ("check_SD_block_clear(%ld)returned ERROR in SD_find_next_clear_block\r\n", stab); sd_jf = 1; // reassert error flag return false; } pc.printf ("Completed find_next, stab = %d\r\n", stab); *blok = stab; // block number of next free block return true; } bool SD_card_erase_all (void) { // assumes sd card is 4 Gbyte, erases 4 Gbyte. Called from CLI uint64_t EndAddr = GIGAB * 4, StartAddr = 0LL; sd_jf = 0; pc.printf ("Erasing SD card ... "); // uint8_t Erase(uint64_t StartAddr, uint64_t EndAddr); SD_state = sd.Erase(StartAddr, EndAddr); if (SD_state != SD_OK) { pc.printf ("SD_card_erase_all FAILED\r\n"); sd_jf = 1; return false; } pc.printf ("no error detected\r\n"); return true; } bool mainSDtest() { SD_state = sd.Init(); if(SD_state != SD_OK) { pc.printf ("sd.Init set SD_state to %0x\r\n", SD_state); if(SD_state == MSD_ERROR_SD_NOT_PRESENT) { pc.printf("SD shall be inserted before running test\r\n"); } else { pc.printf("SD Initialization : FAIL.\r\n"); } pc.printf("SD Test Aborted.\r\n"); return false; } // else { // SD_state is SD_OK pc.printf("SD Initialization : OK.\r\n"); // SD_card_erase_all(); // if (sd_error()) // pc.printf ("SD_card_erase_all() reports ERROR"); SD_find_next_clear_block(& SD_blockptr); pc.printf ("SD_find_next_clear_block returned %lld\r\n\n\n", SD_blockptr); if (sd_error()) { pc.printf ("***** ERROR returned from SD_find_next_clear_block ***** SD ops aborted\r\n"); return false; } pc.printf("SD_find_next_clear_block() returned %ld\r\n", SD_blockptr); if (SD_blockptr < 1) { pc.printf ("Looks like card newly erased, SD_blockptr value of %d\r\n", SD_blockptr); SD_blockptr = 0; historic_distance = 0; } else { SD_state = sd.ReadBlocks(SDBuffer, SD_BLOCKSIZE * (SD_blockptr - 1), SD_BLOCKSIZE, 1); if (SD_state != SD_OK) { pc.printf ("Error reading last block from SD block %d\r\n", SD_blockptr - 1); return false; } for (int i = 0; i < (SD_BLOCKSIZE >> 2); i++) pc.printf ("%lx\t", SDBuffer[i]); historic_distance = SDBuffer[(SD_BLOCKSIZE >> 2) - 1]; pc.printf ("\r\nAbove, data read from last filled SD block %lld, using historic_distance = %lx\r\n", SD_blockptr - 1, historic_distance); } if (SD_blockptr > 2) { for (int i = SD_blockptr - 2; i < SD_blockptr + 2; i++) { pc.printf ("check_SD_block_clear (%d) ", i); if (check_SD_block_clear(i)) pc.printf ("block %ld is CLEAR\r\n", i); else pc.printf ("block %ld is NOT clear\r\n", i); if (sd_error()) { pc.printf ("ERROR from check_SD_block_clear ()\r\n"); } } } return true; } class speed_measurement // Interrupts at qtr sec cause read of Hall_pulse counters which are incremented by transitions of Hall inputs { static const int SPEED_AVE_PTS = 9; // AVE_PTS - points in moving average filters int speed_maf_mem [(SPEED_AVE_PTS + 1) * 2][NUMBER_OF_MOTORS], latest_counter_read[NUMBER_OF_MOTORS], prev_counter_read[NUMBER_OF_MOTORS], mafptr; int raw_filtered () ; // sum of count for all motors public: speed_measurement () { memset(speed_maf_mem, 0, sizeof(speed_maf_mem)); mafptr = 0; memset (latest_counter_read, 0, sizeof(latest_counter_read)); memset (prev_counter_read, 0, sizeof(prev_counter_read)); } // constructor int raw_filtered (int) ; // count for one motor int RPM () ; double MPH () ; void qtr_sec_update () ; uint32_t metres_travelled (); uint32_t pulse_total (); } speed ; int speed_measurement::raw_filtered () // sum of count for all motors { int result = 0, a, b; for (b = 0; b < NUMBER_OF_MOTORS; b++) { for (a = 0; a < SPEED_AVE_PTS; a++) { result += speed_maf_mem[a][b]; } } return result; } int speed_measurement::raw_filtered (int motor) // count for one motor { int result = 0, a; for (a = 0; a < SPEED_AVE_PTS; a++) { result += speed_maf_mem[a][motor]; } return result; } double speed_measurement::MPH () { return rpm2mph * (double)RPM(); } int speed_measurement::RPM () { int rpm = raw_filtered (); rpm *= 60 * 4; // 60 sec per min, 4 quarters per sec, result pulses per min rpm /= (SPEED_AVE_PTS * NUMBER_OF_MOTORS * 8); // 8 transitions counted per rev return rpm; } void speed_measurement::qtr_sec_update () // this to be called every quarter sec to read counters and update maf { mafptr++; if (mafptr >= SPEED_AVE_PTS) mafptr = 0; for (int a = 0; a < NUMBER_OF_MOTORS; a++) { prev_counter_read[a] = latest_counter_read[a]; latest_counter_read[a] = Hall_pulse[a]; speed_maf_mem[mafptr][a] = latest_counter_read[a] - prev_counter_read[a]; } } uint32_t speed_measurement::metres_travelled () { return pulse_total() / (int)PULSES_PER_METRE; } uint32_t speed_measurement::pulse_total () { return historic_distance + Hall_pulse[0] + Hall_pulse[1] + Hall_pulse[2] + Hall_pulse[3]; } void set_V_limit (double p) // Sets max motor voltage { if (p < 0.0) p = 0.0; if (p > 1.0) p = 1.0; last_pwm = p; p *= 0.95; // need limit, ffi see MCP1630 data p = 1.0 - p; // because pwm is wrong way up maxv.pulsewidth_ticks ((int)(p * MAX_PWM_TICKS)); // PWM output on pin D12 inverted motor pwm } void set_I_limit (double p) // Sets max motor current { int a; if (p < 0.0) p = 0.0; if (p > 1.0) p = 1.0; a = (int)(p * MAX_PWM_TICKS); if (a > MAX_PWM_TICKS) a = MAX_PWM_TICKS; if (a < 0) a = 0; maxi.pulsewidth_ticks (a); // PWM output on pin D12 inverted motor pwm } double read_ammeter () { int a = 0; for (int b = 0; b < MAF_PTS; b++) a += I_maf[b]; a /= MAF_PTS; double i = (double) a; return (i * 95.0 / 32768.0) - 95.0 + 0.46; // fiddled to suit current module } double read_voltmeter () { int a = 0; for (int b = 0; b < MAF_PTS; b++) a += V_maf[b]; a /= MAF_PTS; double i = (double) a; return (i / 617.75) + 0.3; // fiddled to suit current module } // Interrupt Service Routines void ISR_mot1_hall_handler () // read motor position pulse signals from up to six motors { Hall_pulse[0]++; } void ISR_mot2_hall_handler () { Hall_pulse[1]++; } void ISR_mot3_hall_handler () { Hall_pulse[2]++; } void ISR_mot4_hall_handler () { Hall_pulse[3]++; } /*void ISR_mot5_hall_handler () { Hall_pulse[4]++; } void ISR_mot6_hall_handler () { Hall_pulse[5]++; } */ void ISR_current_reader (void) // FIXED at 250us { trigger_current_read = true; // every 250us, i.e. 4kHz NOTE only sets trigger here, readings taken in main loop } void ISR_tick_32ms (void) // { trigger_32ms = true; } void ISR_tick_250ms (void) { qtrsec_trig = true; } // End of Interrupt Service Routines bool inlist (struct ky_bd & a, int key) { int i = 0; while (i < a.count) { if (key == a.ky[i].keynum) return true; i++; } return false; } void stuff_to_do_every_250us () // Take readings of system voltage and current { if (!trigger_current_read) return; trigger_current_read = false; I_maf[maf_ptr] = ht_amps_ain.read_u16(); V_maf[maf_ptr] = ht_volts_ain.read_u16(); maf_ptr++; if (maf_ptr > MAF_PTS - 1) maf_ptr = 0; } /* Feb 2017, re-thought use of FR and SG signals. Rename these FWD and REV. Truth table for actions required now : - FWD(A5) REV(A4) PWM Action 0 0 0 'Handbrake' - energises motor to not move 0 0 1 'Handbrake' - energises motor to not move 0 1 0 Reverse0 0 1 1 Reverse1 1 0 0 Forward0 1 0 1 Forward1 1 1 0 Regen Braking 1 1 1 Regen Braking */ void set_run_mode (int mode) { if (mode == HANDBRAKE_SLIPPING) slider.handbrake_slipping = true; else slider.handbrake_slipping = false; switch (mode) { // STATES, INACTIVE, RUN, NEUTRAL_DRIFT, REGEN_BRAKE, PARK}; // case HANDBRAKE_SLIPPING: // break; case PARK: // PARKED new rom code IS now finished. forward_pin = 0; reverse_pin = 0; slider.state = mode; set_V_limit (0.075); // was 0.1 set_I_limit (slider.handbrake_effort); break; case REGEN_BRAKE: // BRAKING, pwm affects degree forward_pin = 1; reverse_pin = 1; slider.state = mode; break; case NEUTRAL_DRIFT: slider.state = mode; set_I_limit (0.0); // added after first test runs, looking for cause of mechanical startup snatch set_V_limit (0.0); // added after first test runs, looking for cause of mechanical startup snatch break; case RUN: if (slider.direction) { forward_pin = 0; reverse_pin = 1; } else { forward_pin = 1; reverse_pin = 0; } slider.state = mode; break; default: break; } } void update_SD_card () { // Hall pulse total updated once per sec and saved in blocks of 128 to SD card static int index = 0; static uint32_t buff[(SD_BLOCKSIZE >> 2) + 2]; buff[index++] = speed.pulse_total(); // pulse_total for all time, add this to buffer to write to SD if (index >= (SD_BLOCKSIZE >> 2)) { pc.printf ("Writing new SD block %d ... ", SD_blockptr); SD_state = sd.WriteBlocks(buff, SD_BLOCKSIZE * SD_blockptr, SD_BLOCKSIZE, 1); SD_blockptr++; if (SD_state == SD_OK) pc.printf ("OK, distance %d\r\n", buff[index - 1] / (int)PULSES_PER_METRE); else pc.printf ("ERROR\r\n"); index = 0; } } int main() { int c_5 = 0, seconds = 0, minutes = 0; ky_bd kybd_a, kybd_b; memset (&kybd_a, 0, sizeof(kybd_a)); memset (&kybd_b, 0, sizeof(kybd_b)); spareio_d8.mode (PullUp); spareio_d9.mode (PullUp); spareio_d10.mode(PullUp); Ticker tick250us; Ticker tick32ms; Ticker tick250ms; // Setup User Interrupt Vectors mot1hall.fall (&ISR_mot1_hall_handler); mot1hall.rise (&ISR_mot1_hall_handler); mot2hall.fall (&ISR_mot2_hall_handler); mot2hall.rise (&ISR_mot2_hall_handler); mot3hall.fall (&ISR_mot3_hall_handler); mot3hall.rise (&ISR_mot3_hall_handler); mot4hall.fall (&ISR_mot4_hall_handler); mot4hall.rise (&ISR_mot4_hall_handler); tick250us.attach_us (&ISR_current_reader, 250); // set to longer time to test tick32ms.attach_us (&ISR_tick_32ms, 32001); tick250ms.attach_us (&ISR_tick_250ms, 250002); pc.baud (9600); GfetT1 = 0; GfetT2 = 0; // two output bits for future use driving horns if (f_r_switch) slider.direction = FWD; // make decision from key switch position here else slider.direction = REV; // make decision from key switch position here // max_pwm_ticks = SystemCoreClock / (2 * PWM_HZ); // prescaler min value is 2, or so it would seem. SystemCoreClock returns 216000000 on F746NG board maxv.period_ticks (MAX_PWM_TICKS + 1); // around 18 kHz maxi.period_ticks (MAX_PWM_TICKS + 1); set_I_limit (0.0); set_V_limit (0.0); pc.printf ("Jon's Touch Screen Loco 2017 sytem starting up %s\r\n", slider.direction ? "Forward":"Reverse"); uint8_t lcd_status = touch_screen.Init(lcd.GetXSize(), lcd.GetYSize()); if (lcd_status != TS_OK) { lcd.Clear(LCD_COLOR_RED); lcd.SetBackColor(LCD_COLOR_RED); lcd.SetTextColor(LCD_COLOR_WHITE); lcd.DisplayStringAt(0, LINE(5), (uint8_t *)"TOUCHSCREEN INIT FAIL", CENTER_MODE); wait (20); } else { lcd.Clear(LCD_COLOR_DARKBLUE); lcd.SetBackColor(LCD_COLOR_GREEN); lcd.SetTextColor(LCD_COLOR_WHITE); lcd.DisplayStringAt(0, LINE(5), (uint8_t *)"TOUCHSCREEN INIT OK", CENTER_MODE); } lcd.SetFont(&Font16); lcd.Clear(LCD_COLOR_LIGHTGRAY); setup_buttons(); // draws buttons slider.oldpos = 0; slider.loco_speed = 0.0; slider.handbrake_effort = 0.1; slider.position = MAX_POS - 2; // Low down in REGEN_BRAKE position - NOT to power-up in PARK SliderGraphic (slider); // sets slider.state to value determined by slider.position set_run_mode (REGEN_BRAKE); // sets slider.mode lcd.SetBackColor(LCD_COLOR_DARKBLUE); vm_set(); // Draw 3 analogue meter movements, speedo, voltmeter, ammeter mainSDtest(); bool toggle32ms = false; // Main loop while(1) { // struct ky_bd * present_kybd, * previous_kybd; bool sliderpress = false; command_line_interpreter () ; // Do any actions from command line via usb link stuff_to_do_every_250us () ; if (trigger_32ms == true) { // Stuff to do every 32 milli secs trigger_32ms = false; toggle32ms = !toggle32ms; if (toggle32ms) { present_kybd = &kybd_a; previous_kybd = &kybd_b; } else { present_kybd = &kybd_b; previous_kybd = &kybd_a; } read_keypresses (*present_kybd); sliderpress = false; slider.recalc_run = false; int j = 0; // if (present2->count > previous_kybd->count) pc.printf ("More presses\r\n"); // if (present2->count < previous_kybd->count) pc.printf ("Fewer presses\r\n"); if (present_kybd->count || previous_kybd->count) { // at least one key pressed this time or last time int k; double dbl; // pc.printf ("Keys action may be required"); // if key in present and ! in previous, found new key press to handle // if key ! in present and in previous, found new key release to handle if (inlist(*present_kybd, SLIDER)) { // Finger is on slider, so Update slider graphic here sliderpress = true; k = present_kybd->slider_y; // get position of finger on slider if (slider.state == RUN && k != slider.position) // Finger has moved within RUN range slider.recalc_run = true; if (slider.state == RUN && k >= NEUTRAL_VAL) // Finger has moved from RUN to BRAKE range slider.position = k = NEUTRAL_VAL; // kill drive for rapid reaction to braking else { // nice slow non-jerky glidey movement required dbl = (double)(k - slider.position); dbl /= 13.179; if (dbl < 0.0) dbl -= 1.0; if (dbl > 0.0) dbl += 1.0; slider.position += (int)dbl; } SliderGraphic (slider); // sets slider.state to value determined by slider.position set_run_mode (slider.state); draw_button_hilight (SLIDER, LCD_COLOR_YELLOW) ; if (slider.state == REGEN_BRAKE) { double brake_effort = ((double)(slider.position - NEUTRAL_VAL) / (double)(MAX_POS - NEUTRAL_VAL)); // brake_effort normalised to range 0.0 to 1.0 brake_effort *= 0.97; // upper limit to braking effort, observed effect before was quite fierce pc.printf ("Brake effort %.2f\r\n", brake_effort); /* set_pwm (brake_effort); */ set_V_limit (sqrt(brake_effort)); // sqrt gives more linear feel to control set_I_limit (1.0); } } else { // pc.printf ("Slider not touched\r\n"); } j = 0; while (j < present_kybd->count) { // handle new key presses k = present_kybd->ky[j++].keynum; if (inlist(*present_kybd, k)) { switch (k) { // Here for auto-repeat type key behaviour case 21: // key is 'voltmeter' // set_V_limit (last_pwm * 1.002 + 0.001); break; case 22: // key is 'ammeter' // set_V_limit (last_pwm * 0.99); break; } // endof switch (k) } // endof if (inlist(*present2, k)) { if (inlist(*present_kybd, k) && !inlist(*previous_kybd, k)) { pc.printf ("Handle Press %d\r\n", k); draw_button_hilight (k, LCD_COLOR_YELLOW) ; switch (k) { // Handle new touch screen button presses here - single action per press, not autorepeat case SPEEDO_BUT: // pc.printf ("Speedometer key pressed %d\r\n", k); break; case VMETER_BUT: // pc.printf ("Voltmeter key pressed %d\r\n", k); break; case AMETER_BUT: // pc.printf ("Ammeter key pressed %d\r\n", k); break; default: pc.printf ("Unhandled keypress %d\r\n", k); break; } // endof switch (button) } } // endof while - handle new key presses j = 0; while (j < previous_kybd->count) { // handle new key releases k = previous_kybd->ky[j++].keynum; if (inlist(*previous_kybd, k) && !inlist(*present_kybd, k)) { pc.printf ("Handle Release %d\r\n", k); draw_button_hilight (k, LCD_COLOR_DARKBLUE) ; } } // endof while - handle new key releases } // endof at least one key pressed this time or last time if (sliderpress == false) { // need to glide dead-mans function towards neutral here if (slider.position < NEUTRAL_VAL) { slider.position += 1 + (NEUTRAL_VAL - slider.position) / DAMPER_DECAY; SliderGraphic (slider); slider.recalc_run = true; } } if (slider.recalc_run) { // range of slider.position in RUN mode is min_pos_() to NEUTRAL_VAL - 1 slider.recalc_run = false; // All RUN power and pwm calcs done here int b = slider.position; double torque_req; if (b > NEUTRAL_VAL) b = NEUTRAL_VAL; if (b < MIN_POS) // if finger position is above top of slider limit b = MIN_POS; b = NEUTRAL_VAL - b; // now got integer going positive for increasing power demand torque_req = (double) b; torque_req /= (NEUTRAL_VAL - MIN_POS); // in range 0.0 to 1.0 pc.printf ("torque_rec = %.3f, last_pwm = %.3f\r\n", torque_req, last_pwm); set_I_limit (torque_req); if (torque_req < 0.05) set_V_limit (last_pwm / 2.0); else { if (last_pwm < 0.99) set_V_limit (last_pwm + 0.05); // ramp voltage up rather than slam to max } } } // endof doing 32ms stuff if (qtrsec_trig == true) { // do every quarter second stuff here qtrsec_trig = false; speed.qtr_sec_update (); double speedmph = speed.MPH(), amps = 0.0 - read_ammeter(), volts = read_voltmeter(); //static const double mph_2_mm_per_sec = 447.04; // exact // double mm_travelled_in_qtrsec = speedmph * mph_2_mm_per_sec / 4.0; slider.loco_speed = speedmph; update_meters (speedmph, amps, volts) ; // update_meters (7.5, amps, volts) ; led_grn = !led_grn; if (slider.state == PARK) { if (speedmph > LOCO_HANDBRAKE_ESCAPE_SPEED / 4.0) { slider.handbrake_effort *= 1.1; if (slider.handbrake_effort > 0.55) slider.handbrake_effort = 0.55; set_run_mode (PARK); pc.printf ("Handbrake slipping, effort %.2f\r\n", slider.handbrake_effort); } if (speedmph < 0.02) { slider.handbrake_effort *= 0.9; if (slider.handbrake_effort < 0.05) slider.handbrake_effort = 0.05; set_run_mode (PARK); pc.printf ("Handbrake not slipping, effort %.2f\r\n", slider.handbrake_effort); } } c_5++; // Can do stuff once per second here if(c_5 > 3) { c_5 = 0; seconds++; if (seconds > 59) { seconds = 0; minutes++; // do once per minute stuff here } // fall back into once per second if(SD_state == SD_OK) { uint32_t distance = speed.metres_travelled(); char dist[20]; sprintf (dist, "%05d m", distance); displaytext (236, 226, 2, dist); update_SD_card (); // Buffers data for SD card, writes when buffer filled } // calc_motor_amps( mva); } // endof if(c_5 > 3 } // endof if (qtrsec_trig == true) { } // endof while(1) main programme loop } // endof int main() {