Add ATTiny example, change Minimal define

- Added ATTiny example per tong67, issue #17
- included print functions in #define MINIMAL per Damme, issue #16
- add #define RF24_TINY for simplification

RF24.cpp

@@ -19,7 +19,7 @@ void RF24::csn(bool mode)
   // divider of 4 is the minimum we want.
   // CLK:BUS 8Mhz:2Mhz, 16Mhz:4Mhz, or 20Mhz:5Mhz
 #ifdef ARDUINO
-	#if  ( !defined( __AVR_ATtiny85__ ) && !defined( __AVR_ATtiny84__) && !defined (__arm__)  ) || defined (CORE_TEENSY)
+	#if  ( !defined(RF24_TINY) && !defined (__arm__)  ) || defined (CORE_TEENSY)
  			SPI.setBitOrder(MSBFIRST);
   			SPI.setDataMode(SPI_MODE0);
 			SPI.setClockDivider(SPI_CLOCK_DIV2);
@@ -270,7 +270,7 @@ uint8_t RF24::get_status(void)
 }
 
 /****************************************************************************/
-
+#if !defined (MINIMAL)
 void RF24::print_status(uint8_t status)
 {
   printf_P(PSTR("STATUS\t\t = 0x%02x RX_DR=%x TX_DS=%x MAX_RT=%x RX_P_NO=%x TX_FULL=%x\r\n"),
@@ -325,7 +325,7 @@ void RF24::print_address_register(const char* name, uint8_t reg, uint8_t qty)
 
   printf_P(PSTR("\r\n"));
 }
-
+#endif
 /****************************************************************************/
 
 RF24::RF24(uint8_t _cepin, uint8_t _cspin):
@@ -1293,7 +1293,7 @@ void RF24::setRetries(uint8_t delay, uint8_t count)
 #	define SS   3   // PA7
 #endif
 
-#if defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__) || defined(__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
+#if defined(RF24_TINY)
 
 void SPIClass::begin() {
 

RF24_config.h

@@ -28,7 +28,11 @@
   
   // Define _BV for non-Arduino platforms and for Arduino DUE
 #if defined (ARDUINO) && !defined (__arm__)
-	#include <SPI.h>
+	#if defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__) || defined(__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
+		#define RF24_TINY
+	#else
+		#include <SPI.h>
+	#endif
 #else
 
   #include <stdint.h>
@@ -55,7 +59,7 @@
 	#define IF_SERIAL_DEBUG(x) ({x;})
   #else
 	#define IF_SERIAL_DEBUG(x)
-	#if defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny85__)
+	#if defined(RF24_TINY)
 	#define printf_P(...)
     #endif
   #endif
@@ -101,7 +105,7 @@
 
 // ATTiny support code is from https://github.com/jscrane/RF24
 
-#if defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__) || defined(__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
+#if defined(RF24_TINY)
 #include <stdio.h>
 #include <Arduino.h>
 #include <avr/pgmspace.h>

examples/rf24ping85/rf24ping85.ino

+/*
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+version 2 as published by the Free Software Foundation.
+
+    rf24ping85.ino by tong67 ( https://github.com/tong67 )
+    This is an example of how to use the RF24 class to communicate with ATtiny85 and other node.
+    Write this sketch to an ATtiny85. It will act like the 'transmit' mode of GettingStarted.ino
+    Write GettingStarted.ino sketch to UNO (or other board or RPi) and put the node in 'receiver' mode.
+    The ATtiny85 will transmit a counting number every second starting from 1.
+    The ATtiny85 uses the tiny-core by CodingBadly (https://code.google.com/p/arduino-tiny/)
+    When direct use of 3v3 does not work (UNO boards have bad 3v3 line) use 5v with LED (1.8V ~ 2.2V drop)
+
+
+    ** Hardware configuration **
+    ATtiny25/45/85 Pin map
+    +-\/-+
+    Reset/Ain0 (D 5) PB5 1|o |8 Vcc (3v3 or -- LED -- 5v)
+    nRF24L01 CE, Pin3 - Ain3 (D 3) PB3 2| |7 PB2 (D 2) Ain1 - nRF24L01 SCK, pin5
+    nRF24L01 CSN, Pin4 - Ain2 (D 4) PB4 3| |6 PB1 (D 1) pwm1 - nRF24L01 MOSI, pin7
+    GND 4| |5 PB0 (D 0) pwm0 - nRF24L01 MISO, pin6
+    CE and CSN are configurable
+*/  
+
+
+#define CE_PIN 3
+#define CSN_PIN 4
+
+#include "RF24.h"
+
+RF24 radio(CE_PIN, CSN_PIN);
+
+byte addresses[][6] = {
+  "1Node","2Node"};
+unsigned long payload = 0;
+
+void setup() {
+  // Setup and configure rf radio
+  radio.begin(); // Start up the radio
+  radio.setAutoAck(1); // Ensure autoACK is enabled
+  radio.setRetries(15,15); // Max delay between retries & number of retries
+  radio.openWritingPipe(addresses[0]); // Write to device address '1Node'
+  radio.openReadingPipe(1,addresses[1]); // Read on pipe 1 for device address '2Node'
+  radio.startListening(); // Start listening
+}
+
+void loop(void){
+  
+  radio.stopListening(); // First, stop listening so we can talk.
+  payload++;
+  radio.write( &payload, sizeof(unsigned long) );
+  radio.startListening(); // Now, continue listening
+
+    unsigned long started_waiting_at = micros(); // Set up a timeout period, get the current microseconds
+  boolean timeout = false; // Set up a variable to indicate if a response was received or not
+
+  while ( !radio.available() ){ // While nothing is received
+    if (micros() - started_waiting_at > 200000 ){ // If waited longer than 200ms, indicate timeout and exit while loop
+      timeout = true;
+      break;
+    }
+
+  }
+
+  if ( !timeout ){ // Describe the results
+    unsigned long got_time; // Grab the response, compare, and send to debugging spew
+    radio.read( &got_time, sizeof(unsigned long) );
+  }
+
+  // Try again 1s later
+  delay(1000);
+}