Hi SurferTim,
Thank you for comment.
PinSelectline is already inserted in writeRegister(). but SD_module not inactive, I add digitalWrite(SD_chipSelectPin, HIGH) at original code.
But problem is not fixed.
void writeRegister(byte thisRegister, byte thisValue) {
// SCP1000 expects the register address in the upper 6 bits
// of the byte. So shift the bits left by two bits:
thisRegister = thisRegister << 2;
// now combine the register address and the command into one byte:
byte dataToSend = thisRegister | WRITE;
// take the chip select low to select the device:
digitalWrite(SD_chipSelectPin, HIGH);
digitalWrite(chipSelectPin, LOW);
SPI.transfer(dataToSend); //Send register location
SPI.transfer(thisValue); //Send value to record into register
// take the chip select high to de-select:
digitalWrite(SD_chipSelectPin, LOW);
digitalWrite(chipSelectPin, HIGH);
}