[SOLVED] Using SPI on Arduino Nano to control a shift register (TPIC6B595)

Other Hardware LEDs and Multiplexing
5

Here's my working code example:

#include <SPI.h>

#define LATCH D8

SPISettings tpic6c595(10000000UL, MSBFIRST, SPI_MODE0);

byte digitPattern[10] = {
  0b0111111,
  0b0000110,
  0b1011011,
  0b1001111,
  0b1100110,
  0b1101101,
  0b1111101,
  0b0000111,
  0b1111111,
  0b1101111
};

void setup() {
  pinMode(LATCH, OUTPUT);
  Serial.begin(115200);
  SPI.begin();
  SPI.beginTransaction(tpic6c595);
}

void loop() {
  for (int i = 0; i <= 9; i++) {
    unsigned long startTime = micros();
    SPI.transfer(digitPattern[i]);
    Serial.println(micros() - startTime);
    digitalWrite(LATCH, HIGH);
    digitalWrite(LATCH, LOW);
    delay(500);
  }

}

As you can see, I change the latch from high to low with no delay between. What's more, I am running this on a esp8266 @ 80MHz.

*** EDIT **** You have no SPI.begin(). Maybe that's why your code does not work correctly? I'm not certain that using SPI.beginTransaction() means you don't also need to use SPI.begin().