Diff: Nrf2401A.cpp

Revision:

0:db163b6f1592

Child:

1:049f6cb8b160

diff -r 000000000000 -r db163b6f1592 Nrf2401A.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Nrf2401A.cpp	Fri Sep 20 20:55:24 2013 +0000
@@ -0,0 +1,187 @@
+/*
+ *  Nrf2401A.h
+ *  A simplistic interface for using Sparkfun's Nrf2401A breakout boards with Arduino
+ *
+ *  Ported to mbed by Jas Strong <jasmine@heroicrobotics.com>
+ *
+ *  Original code for http://labs.ideo.com by Jesse Tane March 2009
+ *
+ *  License:
+ *  --------
+ *  This is free software. You can redistribute it and/or modify it under
+ *  the terms of Creative Commons Attribution 3.0 United States License. 
+ *  To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/us/ 
+ *  or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.
+ *
+ *  Notes:
+ *  ------
+ *  For documentation on how to use this library, please visit http://www.arduino.cc/playground/Main/InterfacingWithHardware
+ *  Pin connections should be as follows for Arduino:
+ *
+ *  DR1 = 2  (digital pin 2)
+ *  CE  = 3
+ *  CS  = 4
+ *  CLK = 5
+ *  DAT = 6
+ *
+ */
+
+#include "Nrf2401.h"
+
+inline void select_chip(void) {
+    _ce = 1;
+}
+
+inline void deselect_chip(void) {
+    _ce = 0;
+}
+
+inline void enable_chip(void) {
+    _ce = 1;
+}
+
+inline void disable_chip(void) {
+    _ce = 0;
+}
+
+inline void cycle_clock(void) {
+    _clk = 1;
+    delay_us(1);
+    _clk = 0;
+}
+
+inline void tx_data_lo(void) {
+    _dat.output();
+    _dat = 1;
+}
+
+inline void tx_data_hi(void) {
+    _dat.output();
+    _dat = 1;
+}
+
+inline int rx_data_hi(void) {
+    _dat.input();
+    return _dat;
+}
+
+inline int data_ready(void) {
+    return _dr1;
+}
+
+Nrf2401::Nrf2401(PinName n_DR1, PinName n_CE, PinName n_CS, PinName n_CLK, PinName n_DAT) :
+    _dr1(n_DR1), _ce(n_CE), _cs(n_CS), _clk(n_CLK), _clk(n_CLK), _dat(n_DAT)
+{
+  _dat.output();
+  
+  remoteAddress = 0;
+  localAddress = 0;
+  payloadSize = 0;
+  dataRate = 1;
+  channel = 111;
+  power = 3;
+  mode = 0;
+  
+  configuration[7] = 234;
+  configuration[8] = 223;
+  configuration[9] = 212;
+  
+  disable_chip();
+  deselect_chip();
+}
+
+void Nrf2401::rxMode(unsigned char messageSize)
+{
+  mode = 1;
+  if(messageSize) payloadSize = messageSize, configure();
+  else configuration[14] |= 1, loadConfiguration(true);
+  enable_chip();
+  delay_us(250);
+}
+
+void Nrf2401::txMode(unsigned char messageSize)
+{
+  mode = 0;
+  if(messageSize) payloadSize = messageSize, configure();
+  else configuration[14] &= ~1, loadConfiguration(true);
+  delay_us(250);
+}
+
+void Nrf2401::write(unsigned char* dataBuffer)
+{
+  if(!dataBuffer) dataBuffer = (unsigned char*) data;
+  enable_chip();
+  delay_us(5);
+  loadByte(configuration[7]);
+  loadByte(configuration[8]);
+  loadByte(configuration[9]);
+  loadByte(remoteAddress >> 8);
+  loadByte(remoteAddress);
+  for(int i=0; i<payloadSize; i++) loadByte(dataBuffer[i]);
+  disable_chip();
+  delay_us(250);
+}
+
+void Nrf2401::write(unsigned char dataByte)
+{
+  data[0] = dataByte;
+  write();
+}
+
+void Nrf2401::read(unsigned char* dataBuffer)
+{
+  if(!dataBuffer) dataBuffer = (unsigned char*) data;
+  disable_chip();
+  _delay_ms(2);
+  for(int i=0; i<payloadSize; i++)
+  {
+    dataBuffer[i] = 0;
+    for(int n=7; n>-1; n--)
+    {
+      if(RX_DATA_HI) dataBuffer[i] |= (1 << n);
+      delay_us(1);
+      cycle_clock();
+    }
+  }
+  enable_chip();
+  delay_us(1);
+}
+
+bool Nrf2401::available(void)
+{
+  return data_ready();
+}
+
+//// you shouldn't need to call directly any of the methods below this point...
+
+void Nrf2401::configure(void)
+{
+  configuration[1] = payloadSize << 3;
+  configuration[10] = localAddress >> 8;
+  configuration[11] = localAddress;
+  configuration[12] = 163;
+  configuration[13] = power | (dataRate << 5) | 76;
+  configuration[14] = mode | (channel << 1);
+  loadConfiguration();
+}
+
+void Nrf2401::loadConfiguration(bool modeSwitchOnly)
+{
+  disable_chip();
+  select_chip();
+  delay_us(5);
+  if(modeSwitchOnly) loadByte(configuration[14]);
+  else for(int i=0; i<15; i++) loadByte(configuration[i]);
+  deselect_chip();
+}
+
+void Nrf2401::loadByte(unsigned char byte)
+{
+  for(int i=7; i>-1; i--)
+  {
+    if((byte & (1 << i)) == 0) tx_data_lo();
+    else                       tx_data_hi();
+    delay_us(1);
+    cycle_clock();
+  }
+}