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/*
* Based on https://github.com/nRF24/RF24
*/
#include <stdlib.h>
#include "driver/nrf24l01.h"
#include "driver/nrf24l01/registers.h"
#include "driver/spi_b.h"
#include "driver/gpio.h"
#include "arch.h"
#ifndef NRF24L01_EN_PIN
#error makeflag nrf24l01_en_pin required
#endif
#ifndef NRF24L01_CS_PIN
#error makeflag nrf24l01_cs_pin required
#endif
void Nrf24l01::setup()
{
spi.setup();
gpio.output(NRF24L01_EN_PIN);
gpio.output(NRF24L01_CS_PIN);
gpio.write(NRF24L01_EN_PIN, 0);
csnHigh();
arch.delay_ms(5);
// Reset NRF_CONFIG and enable 16-bit CRC.
writeRegister( NRF_CONFIG, 0b00001100 ) ;
// Set 1500uS (minimum for 32B payload in ESB@250KBPS) timeouts, to make testing a little easier
// WARNING: If this is ever lowered, either 250KBS mode with AA is broken or maximum packet
// sizes must never be used. See documentation for a more complete explanation.
setRetries(5,15);
// Reset value is MAX
setPALevel( RF24_PA_MAX ) ;
}
void Nrf24l01::setRetries(uint8_t delay, uint8_t count)
{
writeRegister(SETUP_RETR,(delay&0xf)<<ARD | (count&0xf)<<ARC);
}
void Nrf24l01::setPALevel(uint8_t level)
{
uint8_t setup = readRegister(RF_SETUP) & 0b11111000;
if(level > 3){ // If invalid level, go to max PA
level = (RF24_PA_MAX << 1) + 1; // +1 to support the SI24R1 chip extra bit
}else{
level = (level << 1) + 1; // Else set level as requested
}
writeRegister( RF_SETUP, setup |= level ) ; // Write it to the chip
}
uint8_t Nrf24l01::getStatus()
{
txbuf[0] = NOP;
beginTransaction();
spi.xmit(1, txbuf, 1, rxbuf);
endTransaction();
return rxbuf[0];
}
uint8_t Nrf24l01::readRegister(uint8_t reg)
{
txbuf[0] = R_REGISTER | ( REGISTER_MASK & reg );
txbuf[1] = NOP;
beginTransaction();
spi.xmit(2, txbuf, 2, rxbuf);
endTransaction();
return rxbuf[1];
}
uint8_t Nrf24l01::writeRegister(uint8_t reg, uint8_t value)
{
txbuf[0] = W_REGISTER | (REGISTER_MASK & reg);
txbuf[1] = value;
beginTransaction();
spi.xmit(2, txbuf, 1, rxbuf);
endTransaction();
return rxbuf[0];
}
Nrf24l01 nrf24l01;
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