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GPIO Expander Support #787

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GPIO Expander Support #787

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4b41d2d
adding support for MCP23017
Frenzyritz13 Aug 31, 2021
6d64386
Update RF24_config.h
Frenzyritz13 Aug 31, 2021
e577742
Update RF24_config.h
Frenzyritz13 Aug 31, 2021
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18 changes: 16 additions & 2 deletions RF24.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -101,12 +101,17 @@ void RF24::csn(bool mode)

void RF24::ce(bool level)
{
//Allow for 3-pin use on ATTiny
if (ce_pin != csn_pin) {
#if defined USE_MCP23XXX_AS_CE
USE_MCP23XXX_AS_CE.digitalWrite(ce_pin, level);
#else // !defined(USE_MCP23XXX_AS_CE)
if (ce_pin != csn_pin)
{
digitalWrite(ce_pin, level);
}
#endif // !defined(USE_MCP23XXX_AS_CE)
}


/****************************************************************************/

inline void RF24::beginTransaction()
Expand Down Expand Up @@ -820,6 +825,8 @@ bool RF24::begin(void)

/****************************************************************************/

// This modification assumes you passed the MCP23017 pin number to the RF24 constructor's _ce_pin parameter

bool RF24::_init_pins()
{
if (!isValid()) {
Expand Down Expand Up @@ -854,9 +861,15 @@ bool RF24::_init_pins()

// Initialize pins
if (ce_pin != csn_pin) {
#if !defined (USE_MCP23XXX_AS_CE)
pinMode(ce_pin, OUTPUT);
#endif // !defined (USE_MCP23XXX_AS_CE)
pinMode(csn_pin, OUTPUT);
}

#if defined (USE_MCP23XXX_AS_CE)
USE_MCP23XXX_AS_CE.pinMode(ce_pin, OUTPUT);
#endif // defined(USE_MCP23XXX_AS_CE)

ce(LOW);
csn(HIGH);
Expand All @@ -869,6 +882,7 @@ bool RF24::_init_pins()
return true; // assuming pins are connected properly
}


/****************************************************************************/

bool RF24::_init_radio()
Expand Down
3 changes: 3 additions & 0 deletions RF24_config.h
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,10 @@

#else //Everything else
#include <Arduino.h>
#include "Adafruit_MCP23X17.h"

// This macro assumes that MCP23017::begin() was called by the application prior to RF24::begin().
#define USE_MCP23XXX_AS_CE mcp // the global MCP23017 object declared in main application's code space

#if defined (ARDUINO) && !defined (__arm__) && !defined (__ARDUINO_X86__)
#if defined SPI_UART
Expand Down