#include "Marlin.h"

#ifdef TMC2130

#include "tmc2130.h"
#include <SPI.h>

#define TMC2130_GCONF_NORMAL 0x00000000 // spreadCycle
#define TMC2130_GCONF_SGSENS 0x00003180 // spreadCycle with stallguard (stall activates DIAG0 and DIAG1 [pushpull])
#define TMC2130_GCONF_SILENT 0x00000004 // stealthChop

//externals for debuging
extern float current_position[4];
extern void st_get_position_xy(long &x, long &y);
extern long st_get_position(uint8_t axis);

//chipselect pins
uint8_t tmc2130_cs[4] = { X_TMC2130_CS, Y_TMC2130_CS, Z_TMC2130_CS, E0_TMC2130_CS };
//diag pins
uint8_t tmc2130_diag[4] = { X_TMC2130_DIAG, Y_TMC2130_DIAG, Z_TMC2130_DIAG, E0_TMC2130_DIAG };
//mode
uint8_t tmc2130_mode = TMC2130_MODE_NORMAL;
//holding currents
uint8_t tmc2130_current_h[4] = TMC2130_CURRENTS_H;
//running currents
uint8_t tmc2130_current_r[4] = TMC2130_CURRENTS_R;
//axis stalled flags
uint8_t tmc2130_axis_stalled[2] = {0, 0};

//pwm_ampl
uint8_t tmc2130_pwm_ampl[2] = {TMC2130_PWM_AMPL_XY, TMC2130_PWM_AMPL_XY};
//pwm_grad
uint8_t tmc2130_pwm_grad[2] = {TMC2130_PWM_GRAD_XY, TMC2130_PWM_GRAD_XY};
//pwm_auto
uint8_t tmc2130_pwm_auto[2] = {TMC2130_PWM_AUTO_XY, TMC2130_PWM_AUTO_XY};
//pwm_freq
uint8_t tmc2130_pwm_freq[2] = {TMC2130_PWM_FREQ_XY, TMC2130_PWM_FREQ_XY};


uint32_t tmc2131_axis_sg_pos[2] = {0, 0};

uint8_t sg_homing_axes_mask = 0x00;
uint8_t sg_thrs_x = TMC2130_SG_THRS_X;
uint8_t sg_thrs_y = TMC2130_SG_THRS_Y;

bool skip_debug_msg = false;

//TMC2130 registers
#define TMC2130_REG_GCONF      0x00 // 17 bits
#define TMC2130_REG_GSTAT      0x01 // 3 bits
#define TMC2130_REG_IOIN       0x04 // 8+8 bits
#define TMC2130_REG_IHOLD_IRUN 0x10 // 5+5+4 bits
#define TMC2130_REG_TPOWERDOWN 0x11 // 8 bits
#define TMC2130_REG_TSTEP      0x12 // 20 bits
#define TMC2130_REG_TPWMTHRS   0x13 // 20 bits
#define TMC2130_REG_TCOOLTHRS  0x14 // 20 bits
#define TMC2130_REG_THIGH      0x15 // 20 bits
#define TMC2130_REG_XDIRECT    0x2d // 32 bits
#define TMC2130_REG_VDCMIN     0x33 // 23 bits
#define TMC2130_REG_MSLUT0     0x60 // 32 bits
#define TMC2130_REG_MSLUT1     0x61 // 32 bits
#define TMC2130_REG_MSLUT2     0x62 // 32 bits
#define TMC2130_REG_MSLUT3     0x63 // 32 bits
#define TMC2130_REG_MSLUT4     0x64 // 32 bits
#define TMC2130_REG_MSLUT5     0x65 // 32 bits
#define TMC2130_REG_MSLUT6     0x66 // 32 bits
#define TMC2130_REG_MSLUT7     0x67 // 32 bits
#define TMC2130_REG_MSLUTSEL   0x68 // 32 bits
#define TMC2130_REG_MSLUTSTART 0x69 // 8+8 bits
#define TMC2130_REG_MSCNT      0x6a // 10 bits
#define TMC2130_REG_MSCURACT   0x6b // 9+9 bits
#define TMC2130_REG_CHOPCONF   0x6c // 32 bits
#define TMC2130_REG_COOLCONF   0x6d // 25 bits
#define TMC2130_REG_DCCTRL     0x6e // 24 bits
#define TMC2130_REG_DRV_STATUS 0x6f // 32 bits
#define TMC2130_REG_PWMCONF    0x70 // 22 bits
#define TMC2130_REG_PWM_SCALE  0x71 // 8 bits
#define TMC2130_REG_ENCM_CTRL  0x72 // 2 bits
#define TMC2130_REG_LOST_STEPS 0x73 // 20 bits


uint16_t tmc2130_rd_TSTEP(uint8_t cs);
uint16_t tmc2130_rd_MSCNT(uint8_t cs);
uint16_t tmc2130_rd_DRV_STATUS(uint8_t chipselect);

void tmc2130_wr_CHOPCONF(uint8_t cs, uint8_t toff = 3, uint8_t hstrt = 4, uint8_t hend = 1, uint8_t fd3 = 0, uint8_t disfdcc = 0, uint8_t rndtf = 0, uint8_t chm = 0, uint8_t tbl = 2, uint8_t vsense = 0, uint8_t vhighfs = 0, uint8_t vhighchm = 0, uint8_t sync = 0, uint8_t mres = 0b0100, uint8_t intpol = 1, uint8_t dedge = 0, uint8_t diss2g = 0);
void tmc2130_wr_PWMCONF(uint8_t cs, uint8_t pwm_ampl, uint8_t pwm_grad, uint8_t pwm_freq, uint8_t pwm_auto, uint8_t pwm_symm, uint8_t freewheel);
void tmc2130_wr_TPWMTHRS(uint8_t cs, uint32_t val32);
void tmc2130_wr_THIGH(uint8_t cs, uint32_t val32);

uint8_t tmc2130_axis_by_cs(uint8_t cs);
uint8_t tmc2130_mres(uint16_t microstep_resolution);

uint8_t tmc2130_wr(uint8_t cs, uint8_t addr, uint32_t wval);
uint8_t tmc2130_rd(uint8_t cs, uint8_t addr, uint32_t* rval);
uint8_t tmc2130_txrx(uint8_t cs, uint8_t addr, uint32_t wval, uint32_t* rval);



void tmc2130_init()
{
	MYSERIAL.print("tmc2130_init mode=");
	MYSERIAL.println(tmc2130_mode, DEC);
	WRITE(X_TMC2130_CS, HIGH);
	WRITE(Y_TMC2130_CS, HIGH);
	WRITE(Z_TMC2130_CS, HIGH);
	WRITE(E0_TMC2130_CS, HIGH);
	SET_OUTPUT(X_TMC2130_CS);
	SET_OUTPUT(Y_TMC2130_CS);
	SET_OUTPUT(Z_TMC2130_CS);
	SET_OUTPUT(E0_TMC2130_CS);
	SET_INPUT(X_TMC2130_DIAG);
	SET_INPUT(Y_TMC2130_DIAG);
	SET_INPUT(Z_TMC2130_DIAG);
	SET_INPUT(E0_TMC2130_DIAG);
	SPI.begin();
	for (int i = 0; i < 2; i++) // X Y axes
	{
		uint8_t mres = tmc2130_mres(TMC2130_USTEPS_XY);
		tmc2130_wr_CHOPCONF(tmc2130_cs[i], 3, 5, 1, 0, 0, 0, 0, 2, 1, 0, 0, 0, mres, TMC2130_INTPOL_XY, 0, 0);
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_IHOLD_IRUN, 0x000f0000 | ((tmc2130_current_r[i] & 0x1f) << 8) | (tmc2130_current_h[i] & 0x1f));
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_TPOWERDOWN, 0x00000000);
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_GCONF, (tmc2130_mode == TMC2130_MODE_SILENT)?TMC2130_GCONF_SILENT:TMC2130_GCONF_SGSENS);
		tmc2130_wr_PWMCONF(tmc2130_cs[i], tmc2130_pwm_ampl[i], tmc2130_pwm_grad[i], tmc2130_pwm_freq[i], tmc2130_pwm_auto[i], 0, 0);
		tmc2130_wr_TPWMTHRS(tmc2130_cs[i], TMC2130_TPWMTHRS);
		//tmc2130_wr_THIGH(tmc2130_cs[i], TMC2130_THIGH);
	}
	for (int i = 2; i < 3; i++) // Z axis
	{
		uint8_t mres = tmc2130_mres(TMC2130_USTEPS_Z);
		if (tmc2130_current_r[i] <= 31)
		{
			tmc2130_wr_CHOPCONF(tmc2130_cs[i], 3, 5, 1, 0, 0, 0, 0, 2, 1, 0, 0, 0, mres, TMC2130_INTPOL_Z, 0, 0);
			tmc2130_wr(tmc2130_cs[i], TMC2130_REG_IHOLD_IRUN, 0x000f0000 | ((tmc2130_current_r[i] & 0x1f) << 8) | (tmc2130_current_h[i] & 0x1f));
		}
		else
		{
			tmc2130_wr_CHOPCONF(tmc2130_cs[i], 3, 5, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, mres, TMC2130_INTPOL_Z, 0, 0);
			tmc2130_wr(tmc2130_cs[i], TMC2130_REG_IHOLD_IRUN, 0x000f0000 | (((tmc2130_current_r[i] >> 1) & 0x1f) << 8) | ((tmc2130_current_h[i] >> 1) & 0x1f));
		}
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_TPOWERDOWN, 0x00000000);
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_GCONF, 0x00000000);
	}
	for (int i = 3; i < 4; i++) // E axis
	{
		uint8_t mres = tmc2130_mres(TMC2130_USTEPS_E);
		tmc2130_wr_CHOPCONF(tmc2130_cs[i], 3, 5, 1, 0, 0, 0, 0, 2, 1, 0, 0, 0, mres, TMC2130_INTPOL_E, 0, 0);
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_IHOLD_IRUN, 0x000f0000 | ((tmc2130_current_r[i] & 0x1f) << 8) | (tmc2130_current_h[i] & 0x1f));
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_TPOWERDOWN, 0x00000000);
		tmc2130_wr(tmc2130_cs[i], TMC2130_REG_GCONF, 0x00000000);
	}
}

bool tmc2130_update_sg()
{
#if (defined(TMC2130_SG_HOMING) && defined(TMC2130_SG_HOMING_SW))
	if (sg_homing_axes_mask == 0) return false;
#ifdef TMC2130_DEBUG
	MYSERIAL.print("tmc2130_update_sg mask=0x");
	MYSERIAL.print((int)sg_homing_axes_mask, 16);
	MYSERIAL.print(" stalledX=");
	MYSERIAL.print((int)tmc2130_axis_stalled[0]);
	MYSERIAL.print(" stalledY=");
	MYSERIAL.println((int)tmc2130_axis_stalled[1]);
#endif //TMC2130_DEBUG
	for (uint8_t axis = X_AXIS; axis <= Y_AXIS; axis++) //only X and Y axes
	{
		uint8_t mask = (X_AXIS_MASK << axis);
		if (sg_homing_axes_mask & mask)
		{
			if (!tmc2130_axis_stalled[axis])
			{
				uint8_t cs = tmc2130_cs[axis];
				uint16_t tstep = tmc2130_rd_TSTEP(cs);
				if (tstep < TMC2130_TCOOLTHRS)
				{
					long pos = st_get_position(axis);
					if (abs(pos - tmc2131_axis_sg_pos[axis]) > TMC2130_SG_DELTA)
					{
						uint16_t sg = tmc2130_rd_DRV_STATUS(cs) & 0x3ff;
						if (sg == 0)
						{
							tmc2130_axis_stalled[axis] = true;
#ifdef TMC2130_DEBUG
	MYSERIAL.print("tmc2130_update_sg AXIS STALLED ");
	MYSERIAL.println((int)axis);
#endif //TMC2130_DEBUG
						}
					}
				}
			}
		}
	}
	return true;
#endif
}

void tmc2130_home_enter(uint8_t axes_mask)
{
#ifdef TMC2130_DEBUG
	MYSERIAL.print("tmc2130_home_enter mask=0x");
	MYSERIAL.println((int)axes_mask, 16);
#endif //TMC2130_DEBUG
#ifdef TMC2130_SG_HOMING
	for (uint8_t axis = X_AXIS; axis <= Y_AXIS; axis++) //only X and Y axes
	{
		uint8_t mask = (X_AXIS_MASK << axis);
		if (axes_mask & mask)
		{
			uint8_t cs = tmc2130_cs[axis];
			sg_homing_axes_mask |= mask;
			tmc2131_axis_sg_pos[axis] = st_get_position(axis);
			tmc2130_axis_stalled[axis] = false;
			//Configuration to spreadCycle
			tmc2130_wr(cs, TMC2130_REG_GCONF, TMC2130_GCONF_NORMAL);
			tmc2130_wr(cs, TMC2130_REG_COOLCONF, ((axis == X_AXIS)?sg_thrs_x:sg_thrs_y) << 16);
			tmc2130_wr(cs, TMC2130_REG_TCOOLTHRS, TMC2130_TCOOLTHRS);
#ifndef TMC2130_SG_HOMING_SW
			tmc2130_wr(cs, TMC2130_REG_GCONF, TMC2130_GCONF_SGSENS); //stallguard output DIAG1, DIAG1 = pushpull
#endif //TMC2130_SG_HOMING_SW
		}
	}
#endif //TMC2130_SG_HOMING
}

void tmc2130_home_exit()
{
#ifdef TMC2130_DEBUG
	MYSERIAL.print("tmc2130_home_exit mask=0x");
	MYSERIAL.println((int)sg_homing_axes_mask, 16);
#endif //TMC2130_DEBUG
#ifdef TMC2130_SG_HOMING
	if (sg_homing_axes_mask)
	{
		for (uint8_t axis = X_AXIS; axis <= Y_AXIS; axis++) //only X and Y axes
		{
			uint8_t mask = (X_AXIS_MASK << axis);
			if (sg_homing_axes_mask & mask)
			{
				if (tmc2130_mode == TMC2130_MODE_SILENT)
					tmc2130_wr(tmc2130_cs[axis], TMC2130_REG_GCONF, TMC2130_GCONF_SILENT); // Configuration back to stealthChop
				else
#ifdef TMC2130_SG_HOMING_SW
					tmc2130_wr(tmc2130_cs[axis], TMC2130_REG_GCONF, TMC2130_GCONF_NORMAL);
#else //TMC2130_SG_HOMING_SW
					tmc2130_wr(tmc2130_cs[axis], TMC2130_REG_GCONF, TMC2130_GCONF_SGSENS);
#endif //TMC2130_SG_HOMING_SW
			}
			tmc2130_axis_stalled[axis] = false;
		}
		sg_homing_axes_mask = 0x00;
	}
#endif
}

void tmc2130_home_restart(uint8_t axis)
{
	tmc2131_axis_sg_pos[axis] = st_get_position(axis);
	tmc2130_axis_stalled[axis] = false;
}

void tmc2130_check_overtemp()
{
	const static char TMC_OVERTEMP_MSG[] PROGMEM = "TMC DRIVER OVERTEMP ";
	static uint32_t checktime = 0;
	if (millis() - checktime > 1000 )
	{
		for (int i = 0; i < 4; i++)
		{
			uint32_t drv_status = 0;
			skip_debug_msg = true;
			tmc2130_rd(tmc2130_cs[i], TMC2130_REG_DRV_STATUS, &drv_status);
			if (drv_status & ((uint32_t)1 << 26))
			{ // BIT 26 - over temp prewarning ~120C (+-20C)
				SERIAL_ERRORRPGM(TMC_OVERTEMP_MSG);
				SERIAL_ECHOLN(i);
				for (int j = 0; j < 4; j++)
					tmc2130_wr(tmc2130_cs[j], TMC2130_REG_CHOPCONF, 0x00010000);
				kill(TMC_OVERTEMP_MSG);
			}
		}
		checktime = millis();
	}
}

void tmc2130_set_current_h(uint8_t axis, uint8_t current)
{
	MYSERIAL.print("tmc2130_set_current_h ");
	MYSERIAL.print((int)axis);
	MYSERIAL.print(" ");
	MYSERIAL.println((int)current);
	tmc2130_current_h[axis] = current;
	tmc2130_wr(tmc2130_cs[axis], TMC2130_REG_IHOLD_IRUN, 0x000f0000 | ((tmc2130_current_r[axis] & 0x1f) << 8) | (tmc2130_current_h[axis] & 0x1f));
}

void tmc2130_set_current_r(uint8_t axis, uint8_t current)
{
	MYSERIAL.print("tmc2130_set_current_r ");
	MYSERIAL.print((int)axis);
	MYSERIAL.print(" ");
	MYSERIAL.println((int)current);
	tmc2130_current_r[axis] = current;
	tmc2130_wr(tmc2130_cs[axis], TMC2130_REG_IHOLD_IRUN, 0x000f0000 | ((tmc2130_current_r[axis] & 0x1f) << 8) | (tmc2130_current_h[axis] & 0x1f));
}

void tmc2130_print_currents()
{
	MYSERIAL.println("tmc2130_print_currents");
	MYSERIAL.println("\tH\rR");
	MYSERIAL.print("X\t");
	MYSERIAL.print((int)tmc2130_current_h[0]);
	MYSERIAL.print("\t");
	MYSERIAL.println((int)tmc2130_current_r[0]);
	MYSERIAL.print("Y\t");
	MYSERIAL.print((int)tmc2130_current_h[1]);
	MYSERIAL.print("\t");
	MYSERIAL.println((int)tmc2130_current_r[1]);
	MYSERIAL.print("Z\t");
	MYSERIAL.print((int)tmc2130_current_h[2]);
	MYSERIAL.print("\t");
	MYSERIAL.println((int)tmc2130_current_r[2]);
	MYSERIAL.print("E\t");
	MYSERIAL.print((int)tmc2130_current_h[3]);
	MYSERIAL.print("\t");
	MYSERIAL.println((int)tmc2130_current_r[3]);
}

void tmc2130_set_pwm_ampl(uint8_t axis, uint8_t pwm_ampl)
{
	MYSERIAL.print("tmc2130_set_pwm_ampl ");
	MYSERIAL.print((int)axis);
	MYSERIAL.print(" ");
	MYSERIAL.println((int)pwm_ampl);
	tmc2130_pwm_ampl[axis] = pwm_ampl;
	if (((axis == 0) || (axis == 1)) && (tmc2130_mode == TMC2130_MODE_SILENT))
		tmc2130_wr_PWMCONF(tmc2130_cs[axis], tmc2130_pwm_ampl[axis], tmc2130_pwm_grad[axis], tmc2130_pwm_freq[axis], tmc2130_pwm_auto[axis], 0, 0);
}

void tmc2130_set_pwm_grad(uint8_t axis, uint8_t pwm_grad)
{
	MYSERIAL.print("tmc2130_set_pwm_grad ");
	MYSERIAL.print((int)axis);
	MYSERIAL.print(" ");
	MYSERIAL.println((int)pwm_grad);
	tmc2130_pwm_grad[axis] = pwm_grad;
	if (((axis == 0) || (axis == 1)) && (tmc2130_mode == TMC2130_MODE_SILENT))
		tmc2130_wr_PWMCONF(tmc2130_cs[axis], tmc2130_pwm_ampl[axis], tmc2130_pwm_grad[axis], tmc2130_pwm_freq[axis], tmc2130_pwm_auto[axis], 0, 0);
}

uint16_t tmc2130_rd_TSTEP(uint8_t cs)
{
	uint32_t val32 = 0;
	tmc2130_rd(cs, TMC2130_REG_TSTEP, &val32);
	if (val32 & 0x000f0000) return 0xffff;
	return val32 & 0xffff;
}

uint16_t tmc2130_rd_MSCNT(uint8_t cs)
{
	uint32_t val32 = 0;
	tmc2130_rd(cs, TMC2130_REG_MSCNT, &val32);
	return val32 & 0x3ff;
}

uint16_t tmc2130_rd_DRV_STATUS(uint8_t cs)
{
	uint32_t val32 = 0;
	tmc2130_rd(cs, TMC2130_REG_DRV_STATUS, &val32);
	return val32;
}

void tmc2130_wr_CHOPCONF(uint8_t cs, uint8_t toff, uint8_t hstrt, uint8_t hend, uint8_t fd3, uint8_t disfdcc, uint8_t rndtf, uint8_t chm, uint8_t tbl, uint8_t vsense, uint8_t vhighfs, uint8_t vhighchm, uint8_t sync, uint8_t mres, uint8_t intpol, uint8_t dedge, uint8_t diss2g)
{
	uint32_t val = 0;
	val |= (uint32_t)(toff & 15);
	val |= (uint32_t)(hstrt & 7) << 4;
	val |= (uint32_t)(hend & 15) << 7;
	val |= (uint32_t)(fd3 & 1) << 11;
	val |= (uint32_t)(disfdcc & 1) << 12;
	val |= (uint32_t)(rndtf & 1) << 13;
	val |= (uint32_t)(chm & 1) << 14;
	val |= (uint32_t)(tbl & 3) << 15;
	val |= (uint32_t)(vsense & 1) << 17;
	val |= (uint32_t)(vhighfs & 1) << 18;
	val |= (uint32_t)(vhighchm & 1) << 19;
	val |= (uint32_t)(sync & 15) << 20;
	val |= (uint32_t)(mres & 15) << 24;
	val |= (uint32_t)(intpol & 1) << 28;
	val |= (uint32_t)(dedge & 1) << 29;
	val |= (uint32_t)(diss2g & 1) << 30;
	tmc2130_wr(cs, TMC2130_REG_CHOPCONF, val);
}

//void tmc2130_wr_PWMCONF(uint8_t cs, uint8_t PWMautoScale, uint8_t PWMfreq, uint8_t PWMgrad, uint8_t PWMampl)
void tmc2130_wr_PWMCONF(uint8_t cs, uint8_t pwm_ampl, uint8_t pwm_grad, uint8_t pwm_freq, uint8_t pwm_auto, uint8_t pwm_symm, uint8_t freewheel)
{
	uint32_t val = 0;
	val |= (uint32_t)(pwm_ampl & 255);
	val |= (uint32_t)(pwm_grad & 255) << 8;
	val |= (uint32_t)(pwm_freq & 3) << 16;
	val |= (uint32_t)(pwm_auto & 1) << 18;
	val |= (uint32_t)(pwm_symm & 1) << 19;
	val |= (uint32_t)(freewheel & 3) << 20;
	tmc2130_wr(cs, TMC2130_REG_PWMCONF, val);
//	tmc2130_wr(cs, TMC2130_REG_PWMCONF, ((uint32_t)(PWMautoScale+PWMfreq) << 16) | ((uint32_t)PWMgrad << 8) | PWMampl); // TMC LJ -> For better readability changed to 0x00 and added PWMautoScale and PWMfreq
}

void tmc2130_wr_TPWMTHRS(uint8_t cs, uint32_t val32)
{
	tmc2130_wr(cs, TMC2130_REG_TPWMTHRS, val32);
}

void tmc2130_wr_THIGH(uint8_t cs, uint32_t val32)
{
	tmc2130_wr(cs, TMC2130_REG_THIGH, val32);
}

#ifdef TMC2130_DEBUG
uint8_t tmc2130_axis_by_cs(uint8_t cs)
{
	switch (cs)
	{
	case X_TMC2130_CS: return 0;
	case Y_TMC2130_CS: return 1;
	case Z_TMC2130_CS: return 2;
	case E0_TMC2130_CS: return 3;
	}
	return -1;
}
#endif //TMC2130_DEBUG

uint8_t tmc2130_mres(uint16_t microstep_resolution)
{
	if (microstep_resolution == 256) return 0b0000;
	if (microstep_resolution == 128) return 0b0001;
	if (microstep_resolution == 64)  return 0b0010;
	if (microstep_resolution == 32)  return 0b0011;
	if (microstep_resolution == 16)  return 0b0100;
	if (microstep_resolution == 8)   return 0b0101;
	if (microstep_resolution == 4)   return 0b0110;
	if (microstep_resolution == 2)   return 0b0111;
	if (microstep_resolution == 1)   return 0b1000;
	return 0;
}

uint8_t tmc2130_wr(uint8_t cs, uint8_t addr, uint32_t wval)
{
	uint8_t stat = tmc2130_txrx(cs, addr | 0x80, wval, 0);
#ifdef TMC2130_DEBUG_WR
	MYSERIAL.print("tmc2130_wr(");
	MYSERIAL.print((unsigned char)tmc2130_axis_by_cs(cs), DEC);
	MYSERIAL.print(", 0x");
	MYSERIAL.print((unsigned char)addr, HEX);
	MYSERIAL.print(", 0x");
	MYSERIAL.print((unsigned long)wval, HEX);
	MYSERIAL.print(")=0x");
	MYSERIAL.println((unsigned char)stat, HEX);
#endif //TMC2130_DEBUG_WR
	return stat;
}

uint8_t tmc2130_rd(uint8_t cs, uint8_t addr, uint32_t* rval)
{
	uint32_t val32 = 0;
	uint8_t stat = tmc2130_txrx(cs, addr, 0x00000000, &val32);
	if (rval != 0) *rval = val32;
#ifdef TMC2130_DEBUG_RD
	if (!skip_debug_msg)
	{
		MYSERIAL.print("tmc2130_rd(");
		MYSERIAL.print((unsigned char)tmc2130_axis_by_cs(cs), DEC);
		MYSERIAL.print(", 0x");
		MYSERIAL.print((unsigned char)addr, HEX);
		MYSERIAL.print(", 0x");
		MYSERIAL.print((unsigned long)val32, HEX);
		MYSERIAL.print(")=0x");
		MYSERIAL.println((unsigned char)stat, HEX);
	}
	skip_debug_msg = false;
#endif //TMC2130_DEBUG_RD
	return stat;
}

uint8_t tmc2130_txrx(uint8_t cs, uint8_t addr, uint32_t wval, uint32_t* rval)
{
	//datagram1 - request
	SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE3));
	digitalWrite(cs, LOW);
	SPI.transfer(addr); // address
	SPI.transfer((wval >> 24) & 0xff); // MSB
	SPI.transfer((wval >> 16) & 0xff);
	SPI.transfer((wval >> 8) & 0xff);
	SPI.transfer(wval & 0xff); // LSB
	digitalWrite(cs, HIGH);
	SPI.endTransaction();
	//datagram2 - response
	SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE3));
	digitalWrite(cs, LOW);
	uint8_t stat = SPI.transfer(0); // status
	uint32_t val32 = 0;
	val32 = SPI.transfer(0); // MSB
	val32 = (val32 << 8) | SPI.transfer(0);
	val32 = (val32 << 8) | SPI.transfer(0);
	val32 = (val32 << 8) | SPI.transfer(0); // LSB
	digitalWrite(cs, HIGH);
	SPI.endTransaction();
	if (rval != 0) *rval = val32;
	return stat;
}

#endif //TMC2130