ESP32, TMC2209, and UART Control of Microstepping

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The follow code does seem to work better. I misinterpreted the "setSpeedInUs" control at first, it needs to be descending in value (in microseconds)..
Using this code, the motor seems to eventually reach a speed that it finds unsustainable and starts to crash out, for lack of a better term. It gets substantially noisier and more "vocal" when this happens.

Just to make sure I understand a few things correctly:

//this sets a maximum or target speed? 
    stepper->setSpeedInUs(90);  // the parameter is us/step !!!

//does this perpetually accelerate, even once the max speed is reached? 
    stepper->setAcceleration(1000);

//this is the total number of steps before the motor just stops ? is it necessary?
    stepper->move(100000);

I will look a little closer at the documentation for FastAccelStepper to hopefully answer these questions. Full code below for people playing along at home.

#include "FastAccelStepper.h"
#include <TMCStepper.h>

// As in StepperDemo for Motor 1 on AVR
//#define dirPinStepper    5
//#define enablePinStepper 6
//#define stepPinStepper   9  // OC1A in case of AVR

// As in StepperDemo for Motor 1 on ESP32
#define dirPinStepper 15
#define stepPinStepper 2
#define RXD2 16
#define TXD2 17

#define SHAFT true

#define SERIAL_PORT_2 Serial2  // TMC2208/TMC2224 HardwareSerial port - pins 16 & 17
#define DRIVER_ADDRESS_1 0b00    // TMC2209 Driver address according to MS1 and MS2
#define R_SENSE 0.11f          // E_SENSE for current calc, SilentStepStick series use 0.11

FastAccelStepperEngine engine = FastAccelStepperEngine();
FastAccelStepper *stepper = NULL;
TMC2209Stepper driver(&SERIAL_PORT_2, R_SENSE, DRIVER_ADDRESS_1);  // Create TMC driver

void setup() {

  driver.begin();
  driver.pdn_disable(true);      // Use PDN/UART pin for communication
  driver.toff(5);                // [1..15] enable driver in software
  driver.blank_time(24);         // [16, 24, 36, 54]
  driver.I_scale_analog(false);  // Use internal voltage reference
  driver.rms_current(1500);   // motor RMS current (mA) "rms_current will by default set ihold to 50% of irun but you can set your own ratio with additional second argument; rms_current(1000, 0.3)."
  driver.microsteps(1);
  
  engine.init();
  stepper = engine.stepperConnectToPin(stepPinStepper);
  if (stepper) {
    stepper->setDirectionPin(dirPinStepper);
    //stepper->setEnablePin(enablePinStepper);
    stepper->setAutoEnable(true);

    // If auto enable/disable need delays, just add (one or both):
    // stepper->setDelayToEnable(50);
    // stepper->setDelayToDisable(1000);

    stepper->setSpeedInUs(90);  // the parameter is us/step !!!
    stepper->setAcceleration(1000);
    stepper->move(1000000);
  }
}

void loop() {}