Solved
How to set up IRQ pin if i just want to read the RSSI of ST25RU3993
I posted a tread last week but it soon got buried....
So I wasn't able to get any output when probe or read from MISO using Arduino due.
and @Bart Herse asked me in the post have i connected my IRQ pin.
After reading the data sheet I am still not sure what to do with my IRQ signal coming out of ST25. Currently when I probe the IRQ output stays HIGH...I am using the EVAL ST25RU3993
here is my Arduino code, I just want to read RSSI information under default set up.
#include <SPI.h>
////////////////////////////////////////////
//set up pins for arudino due
//MOSI:ICSP-4
//MISO:ICSP-1
//SCK:ICSP-3
//NCS:52
//EN:2
//IRQ:22
///////////////////////////////////////////////
// Set up chip-select pin as NCS and enable pin as EN
const int NCS = 52;
const int EN = 2;
const int IRQ =7;
//SPI setting
SPISettings settingsA(100000, MSBFIRST, SPI_MODE0);
void setup() {
pinMode (NCS, OUTPUT);
pinMode(EN, OUTPUT);
pinMode(IRQ, INPUT);
digitalWrite(EN, HIGH);//set enable to high
Serial.begin(9600);
SPI.begin();
SPI.beginTransaction(settingsA); //I wrote to the following 2 main control registers, register description is at the data sheet
// digitalWrite (NCS, LOW);
// SPI.transfer(0b00000000); // write and register addressL: Device staus register
// SPI.transfer(0b00000001); // value for this register: Turn RF-On
// digitalWrite (NCS, HIGH);
// digitalWrite (NCS, LOW);
// SPI.transfer(0b00000001); // write and register addressL: Protocal Selection Register
// SPI.transfer(0b00000000); // value for this register: Choose EPC Gen2
// digitalWrite (NCS, HIGH);
Serial.print("written");
SPI.endTransaction();
}
int8_t O;
void loop() {
//
for (int i = 0; i <= 25500; i++) {
SPI.beginTransaction(settingsA); //read from my RSSI_Display register
digitalWrite (NCS, LOW);
O = SPI.transfer16(0b0110101100000000);
// SPI.transfer(0b0100000);
digitalWrite (NCS, HIGH);
SPI.endTransaction();
// delay(50);
}
Serial.print(O);
}