#include int CS = 8; static void hostcmd(byte a) { digitalWrite(CS, LOW); SPI.transfer(a); SPI.transfer(0x00); SPI.transfer(0x00); digitalWrite(CS, HIGH); delay(200); } void setup() { Serial.begin(115200); pinMode(CS, OUTPUT); digitalWrite(CS, HIGH); SPI.begin(); SPI.setClockDivider(SPI_CLOCK_DIV128); Serial.println("SPI INIT DONE"); hostcmd(0x00); // wake up hostcmd(0x68); // reset GPU } void loop() { digitalWrite(CS, LOW); Serial.println(); Serial.println(SPI.transfer(0x10), HEX); Serial.println(SPI.transfer(0x24), HEX); Serial.println(SPI.transfer(0x00), HEX); Serial.println(SPI.transfer(0xff), HEX); Serial.println(SPI.transfer(0xff), HEX); Serial.println(SPI.transfer(0xff), HEX); digitalWrite(CS, HIGH); delay(1000); }