MyOwnEtherCATDevice/Cards/EaserCAT-4000-THCAD-Reader/Firmware/src/main.cpp

#include <Arduino.h>
#include <stdio.h>
extern "C"
{
#include "ecat_slv.h"
#include "utypes.h"
};
_Objects Obj;

#include "extend32to64.h"
extend32to64 longTime;
volatile uint64_t irqTime = 0;

HardwareSerial Serial1(PA10, PA9);

#include "HardwareTimer.h"
// NOTE This mod in the beginning of HardwareTimer.cpp for 32-bit precision
////// //#define MAX_RELOAD ((1 << 16) - 1) // Currently even 32b timers are used as 16b to have generic behavior
////// #define MAX_RELOAD 0xFFFFFFFF

// CAN BE PA0, should be PA0
#define THCAD_PIN PA2
// PA2 is connected to Timer 2, a 32-bit timer

uint32_t channel;
volatile uint32_t FrequencyMeasured, LastCapture = 0, CurrentCapture;
uint32_t input_freq = 0;
volatile uint32_t rolloverCompareCount = 0;
HardwareTimer *EncoderTimer;
void InputCapture_IT_callback(void);
void Rollover_IT_callback(void);

volatile uint16_t ALEventIRQ; // ALEvent that caused the interrupt

void cb_set_outputs(void) // Get Master outputs, slave inputs, first operation
{
   ; // Do nothing, we get Scale though.
}

void cb_get_inputs(void) // Set Master inputs, slave outputs, last operation
{
   Obj.Velocity = Obj.Scale * FrequencyMeasured;
}

void ESC_interrupt_enable(uint32_t mask);
void ESC_interrupt_disable(uint32_t mask);
uint16_t dc_checker(void);
void sync0Handler(void);

static esc_cfg_t config =
    {
        .user_arg = NULL,
        .use_interrupt = 1,
        .watchdog_cnt = 150,
        .set_defaults_hook = NULL,
        .pre_state_change_hook = NULL,
        .post_state_change_hook = NULL,
        .application_hook = NULL, // handleStepper,
        .safeoutput_override = NULL,
        .pre_object_download_hook = NULL,
        .post_object_download_hook = NULL,
        .rxpdo_override = NULL,
        .txpdo_override = NULL,
        .esc_hw_interrupt_enable = ESC_interrupt_enable,
        .esc_hw_interrupt_disable = ESC_interrupt_disable,
        .esc_hw_eep_handler = NULL,
        .esc_check_dc_handler = dc_checker,
};

volatile byte serveIRQ = 0;

volatile uint32_t globalIRQ = 0;
void globalInt(void)
{
   globalIRQ++;
}

void setup(void)
{
   Serial1.begin(115200);
   // Automatically retrieve TIM instance and channel associated to pin
   // This is used to be compatible with all STM32 series automatically.
   TIM_TypeDef *Instance = (TIM_TypeDef *)pinmap_peripheral(digitalPinToPinName(THCAD_PIN), PinMap_PWM);
   channel = STM_PIN_CHANNEL(pinmap_function(digitalPinToPinName(THCAD_PIN), PinMap_PWM));

   EncoderTimer = new HardwareTimer(Instance);

   // Configure rising edge detection to measure frequency
   EncoderTimer->setMode(channel, TIMER_INPUT_CAPTURE_RISING, THCAD_PIN);

   // With a PrescalerFactor = 1, the minimum frequency value to measure is : TIM counter clock / CCR MAX
   //  = (SystemCoreClock) / 65535
   // Example on Nucleo_L476RG with systemClock at 80MHz, the minimum frequency is around 1,2 khz
   // To reduce minimum frequency, it is possible to increase prescaler. But this is at a cost of precision.
   // The maximum frequency depends on processing of the interruption and thus depend on board used
   // Example on Nucleo_L476RG with systemClock at 80MHz the interruption processing is around 4,5 microseconds and thus Max frequency is around 220kHz
   uint32_t PrescalerFactor = 1;
   EncoderTimer->setPrescaleFactor(PrescalerFactor);
   EncoderTimer->setOverflow(0xFFFFFFF0); // Max Period value to have the largest possible time to detect rising edge and avoid timer rollover
   EncoderTimer->attachInterrupt(channel, InputCapture_IT_callback);
   EncoderTimer->attachInterrupt(Rollover_IT_callback);
   EncoderTimer->resume();

   // Compute this scale factor only once
   input_freq = EncoderTimer->getTimerClkFreq() / EncoderTimer->getPrescaleFactor();

   ecat_slv_init(&config);
   attachInterrupt(digitalPinToInterrupt(PC0), globalInt, RISING);
}

void loop(void)
{
#if 0 // Sync 0 mode
   uint64_t dTime;
   if (serveIRQ)
   {
      DIG_process(ALEventIRQ, DIG_PROCESS_WD_FLAG | DIG_PROCESS_OUTPUTS_FLAG |
                                  DIG_PROCESS_APP_HOOK_FLAG | DIG_PROCESS_INPUTS_FLAG);
      serveIRQ = 0;
      ESCvar.PrevTime = ESCvar.Time;
      ecat_slv_poll();
   }
   dTime = longTime.extendTime(micros()) - irqTime;
   if (dTime > 5000) // Don't run ecat_slv_poll when expecting to serve interrupt
      ecat_slv_poll();
#else // Freerun mode
   ecat_slv();

#endif
}

void sync0Handler(void)
{
   ALEventIRQ = ESC_ALeventread();
   // if (ALEventIRQ & ESCREG_ALEVENT_SM2)
   {
      irqTime = longTime.extendTime(micros());
      serveIRQ = 1;
   }
}

// Enable SM2 interrupts
void ESC_interrupt_enable(uint32_t mask)
{
   // Enable interrupt for SYNC0 or SM2 or SM3
   uint32_t user_int_mask = ESCREG_ALEVENT_DC_SYNC0 | ESCREG_ALEVENT_SM2 | ESCREG_ALEVENT_SM3;
   if (mask & user_int_mask)
   {
      ESC_ALeventmaskwrite(ESC_ALeventmaskread() | (mask & user_int_mask));
      ESC_ALeventmaskwrite(ESC_ALeventmaskread() & ~(ESCREG_ALEVENT_DC_SYNC0 | ESCREG_ALEVENT_SM3));
      attachInterrupt(digitalPinToInterrupt(PC3), sync0Handler, RISING);

      // Set LAN9252 interrupt pin driver as push-pull active high
      uint32_t bits = 0x00000111;
      ESC_write(0x54, &bits, 4);

      // Enable LAN9252 interrupt
      bits = 0x00000001;
      ESC_write(0x5c, &bits, 4);
   }
}

// Disable SM2 interrupts
void ESC_interrupt_disable(uint32_t mask)
{
   // Enable interrupt for SYNC0 or SM2 or SM3
   // uint32_t user_int_mask = ESCREG_ALEVENT_DC_SYNC0 | ESCREG_ALEVENT_SM2 | ESCREG_ALEVENT_SM3;
   uint32_t user_int_mask = ESCREG_ALEVENT_SM2;

   if (mask & user_int_mask)
   {
      // Disable interrupt from SYNC0
      ESC_ALeventmaskwrite(ESC_ALeventmaskread() & ~(mask & user_int_mask));
      detachInterrupt(digitalPinToInterrupt(PC3));
      // Disable LAN9252 interrupt
      uint32_t bits = 0x00000000;
      ESC_write(0x5c, &bits, 4);
   }
}

extern "C" uint32_t ESC_SYNC0cycletime(void);

// Setup of DC
uint16_t dc_checker(void)
{
   // Indicate we run DC
   ESCvar.dcsync = 1;
   return 0;
}

void InputCapture_IT_callback(void)
{
   CurrentCapture = EncoderTimer->getCaptureCompare(channel);

   /* frequency computation */
   if (CurrentCapture > LastCapture)
   {
      FrequencyMeasured = input_freq / (CurrentCapture - LastCapture);
   }
   else if (CurrentCapture <= LastCapture)
   {
      /* 0xFFFFFFFF is max overflow value */
      FrequencyMeasured = input_freq / (0xFFFFFFFF + CurrentCapture - LastCapture);
   }
   LastCapture = CurrentCapture;
   rolloverCompareCount = 0;
}

/* In case of timer rollover, frequency is to low to be measured set value to 0
   To reduce minimum frequency, it is possible to increase prescaler. But this is at a cost of precision. */
void Rollover_IT_callback(void)
{
   rolloverCompareCount++;

   if (rolloverCompareCount > 1)
   {
      FrequencyMeasured = 0;
   }
}