Arduino stm32 support files for nRF24L01 RF modules
Arduino_Core_STM32 supports SPI library, but only works in Transaction SPI Mode.
- Legacy SPI Mode
SPI speed depends on the CPU frequency.
STM32 does not work because it has various CPU frequencies.
SPI.begin()
SPI.setClockDivider(divider)
SPI.setDataMode(mode)
SPI.setBitOrder(order)
SPI.transfer(data);
- Transaction SPI Mode
SPI speed NOT depends on the CPU frequency.
It also works correctly with STM32.
SPI.begin()
SPI.beginTransaction(SPISettings(speed, order, mode))
SPI.transfer(data);
SPI.endTransaction()
This repository works with Transaction SPI Mode.
- Transmitter
Sketch uses 3054 bytes (9%) of program storage space. Maximum is 32256 bytes.
Global variables use 272 bytes (13%) of dynamic memory, leaving 1776 bytes for local variables. Maximum is 2048 bytes.
- Receiver
Sketch uses 2796 bytes (8%) of program storage space. Maximum is 32256 bytes.
Global variables use 248 bytes (12%) of dynamic memory, leaving 1800 bytes for local variables. Maximum is 2048 bytes.
When changing the settings of the nRF24L01, it is necessary to power cycle the nRF24L01 before executing.
Because nRF24L01 remembers the previous setting.
nRF24L01 does not have Software Reset function.
- Arduino UNO
Nrf24l Mirf = Nrf24l(10, 9);
* VCC 3.3V
* MISO 12
* MOSI 11
* SCK 13
* CE 10
* CSN 9
Serial.print is output to Arduino Serial Monitor.
- Arduino MEGA
Nrf24l Mirf = Nrf24l(10, 9);
* VCC 3.3V
* MISO 50
* MOSI 51
* SCK 52
* CE 10
* CSN 9
Serial.print is output to Arduino Serial Monitor.
- Arduino DUE
Nrf24l Mirf = Nrf24l(10, 9);
* VCC 3.3V
* MISO A.25
* MOSI A.26
* SCK A.27
* CE D10
* CSN D9
Serial.print is output to Arduino Serial Monitor.
- STM32 NUCLEO
Nrf24l Mirf = Nrf24l(10, 9);
* VCC 3.3V
* MISO D12(=PA6)
* MOSI D11(=PA7)
* SCK D13(=PA5)
* CE D10(=PB6)
* CSN D9(=PC7)
Serial.print is output to Arduino Serial Monitor.
- STM32 F4-Discovery
Nrf24l Mirf = Nrf24l(PC6, PC7);
* VCC 3.3V
* MISO PA6
* MOSI PA7
* SCK PA5
* CE PC6
* CSN PC7
Serial.print is output to PA2.
- Generic STM32F103(BluePill/BlackPill/etc)
Nrf24l Mirf = Nrf24l(PB0, PB1);
* VCC 3.3V
* MISO PA6
* MOSI PA7
* SCK PA5
* CE PB0
* CSN PB1
Serial.print is output to PA9.
- Generic STM32F303(BackPill F303CC)
Nrf24l Mirf = Nrf24l(PB0, PB1);
* VCC 3.3V
* MISO PA6
* MOSI PA7
* SCK PA5
* CE PB0
* CSN PB1
Serial.print is output to PA9.
- Generic STM32F401(BlackPill F401CC)
Nrf24l Mirf = Nrf24l(PB0, PB1);
* VCC 3.3V
* MISO PA6
* MOSI PA7
* SCK PA5
* CE PB0
* CSN PB1
Serial.print is output to PA9.
- Generic STM32F405(Adafruit Feather STM32F405 Express)
Nrf24l Mirf = Nrf24l(PB8, PB9);
* VCC 3.3V
* MISO PB14
* MOSI PB15
* SCK PB13
* CE PB8
* CSN PB9
Serial.print is output to PB10.
- Generic STM32F407(DIYMORE)
Nrf24l Mirf = Nrf24l(PB0, PB1);
* VCC 3.3V
* MISO PB4
* MOSI PB5
* SCK PB3
* CE PB0
* CSN PB1
Serial.print is output to PA9.
- Generic STM32F407(BLACK F407VE)
These boards share SPI with NRF24 connector and on board flash.
NRF24L01 (JP2)
1 GND
2 3V3
3 PB6 NRF_CE
4 PB7 NRF_CS
5 PB3 SPI1_SCK
6 PB5 SPI1_MOSI
7 PB4 SPI1_MISO
8 PB8 NRF_IRQ
SPI Flash W25Q16 (U3)
1 PB0 F_CS
2 PB4 SPI1_MISO
3 WP 3V3
4 GND
5 PB5 SPI1_MOSI
6 PB3 SPI1_SCK
7 HOLD 3V3
8 VCC 3V3
It is necessary to remap SPI and separate NRF24 and on board flash.
void setup()
{
SPI.setMOSI(PB15);
SPI.setMISO(PB14);
SPI.setSCLK(PB13);
SPI.setSSEL(PB12);
The following works when you remap SPI.
Nrf24l Mirf = Nrf24l(PB0, PB1);
* VCC 3.3V
* MISO PB14
* MOSI PB15
* SCK PB13
* CE PB0
* CSN PB1
Serial.print is output to PA9.
- ESP8266
Nrf24l Mirf = Nrf24l(15, 16);
* VCC 3.3V
* MISO IO12(D6)
* MOSI IO13(D7)
* SCK IO14(D5)
* CE IO15(D8)
* CSN IO16(D0)
Serial.print is output to IO1.
- ESP8285
Nrf24l Mirf = Nrf24l(15, 16);
* VCC 3.3V
* MISO IO12(D6)
* MOSI IO13(D7)
* SCK IO14(D5)
* CE IO15(D8)
* CSN IO16(D0)
Serial.print is output to IO1.
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