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Add 4 pin mode for ATTINY85 (much less power and still one pin free) #387

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Add 4 pin mode for ATTINY85 (much less power and still one pin free) #387

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5f8e184
Update RF24.cpp
ortegafernando Nov 12, 2017
4c59df0
Update rf24ping85.ino
ortegafernando Nov 12, 2017
804b1eb
Update RF24.cpp
ortegafernando Nov 12, 2017
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4 changes: 2 additions & 2 deletions RF24.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ void RF24::csn(bool mode)
{

#if defined (RF24_TINY)
if (ce_pin != csn_pin) {
if ((ce_pin != csn_pin) && (csn_pin != 0)) {
digitalWrite(csn_pin,mode);
}
else {
Expand Down Expand Up @@ -614,7 +614,7 @@ bool RF24::begin(void)
if (ce_pin != csn_pin) pinMode(ce_pin,OUTPUT);

#if ! defined(LITTLEWIRE)
if (ce_pin != csn_pin)
if ((ce_pin != csn_pin) && (csn_pin != 0))
#endif
pinMode(csn_pin,OUTPUT);

Expand Down
15 changes: 14 additions & 1 deletion examples/rf24_ATTiny/rf24ping85/rf24ping85.ino
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Expand Up @@ -36,6 +36,18 @@ version 2 as published by the Free Software Foundation.
| +----+ |
|-----------------------------------------------||----x-- nRF24L01 CSN, pin4
10nF
ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 0 => PB4 is free to use for application and you can use ackPayload funtionallity
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typo: funtionallity -> funtionality

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"functionality" even better ;)

and you will save power as RF24 could get into sleep between writings as we control CE_PIN

^^
+-\/-+ //
PB5 1|o |8 Vcc --- nRF24L01 VCC, pin2 -----------------x--|<|-- 5V
nRF24L01 CE, pin3 --- PB3 2| |7 PB2 --- nRF24L01 SCK, pin5 --|<|---x-[22k]--| LED
NC PB4 3| |6 PB1 --- nRF24L01 MOSI, pin7 1n4148 |
nRF24L01 GND, pin1 -x- GND 4| |5 PB0 --- nRF24L01 MISO, pin6 |
| +----+ |
|-----------------------------------------------||----x-- nRF24L01 CSN, pin4
10nF

ATtiny24/44/84 Pin map with CE_PIN 8 and CSN_PIN 7
Schematic provided and successfully tested by Carmine Pastore (https://github.com/Carminepz)
Expand All @@ -54,6 +66,7 @@ version 2 as published by the Free Software Foundation.
#define CE_PIN 3
#define CSN_PIN 4
//#define CSN_PIN 3 // uncomment for ATtiny85 3 pins solution
//#define CSN_PIN 0 // uncomment for ATtiny85 4 pins solution

#include "RF24.h"

Expand Down Expand Up @@ -98,4 +111,4 @@ void loop(void){

// Try again 1s later
delay(1000);
}
}