DIY-Multiprotocol-TX-Module/Multiprotocol/CC2500_SPI.ino

/*
 This project is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 Multiprotocol is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
 */
//-------------------------------
//-------------------------------
//CC2500 SPI routines
//-------------------------------
//-------------------------------
#ifdef CC2500_INSTALLED
#include "iface_cc2500.h"

//----------------------------
void CC2500_WriteReg(uint8_t address, uint8_t data)
{
	CC25_CSN_off;
	SPI_Write(address); 
	NOP();
	SPI_Write(data);
	CC25_CSN_on;
} 

//----------------------
static void CC2500_ReadRegisterMulti(uint8_t address, uint8_t data[], uint8_t length)
{
	CC25_CSN_off;
	SPI_Write(CC2500_READ_BURST | address);
	for(uint8_t i = 0; i < length; i++)
		data[i] = SPI_Read();
	CC25_CSN_on;
}

//--------------------------------------------
static uint8_t CC2500_ReadReg(uint8_t address)
{ 
	uint8_t result;
	CC25_CSN_off;
	SPI_Write(CC2500_READ_SINGLE | address);
	result = SPI_Read();  
	CC25_CSN_on;
	return(result); 
} 

//------------------------
void CC2500_ReadData(uint8_t *dpbuffer, uint8_t len)
{
	CC2500_ReadRegisterMulti(CC2500_3F_RXFIFO, dpbuffer, len);
}

//*********************************************
void CC2500_Strobe(uint8_t state)
{
	CC25_CSN_off;
	SPI_Write(state);
	CC25_CSN_on;
}

static void CC2500_WriteRegisterMulti(uint8_t address, const uint8_t data[], uint8_t length)
{
	CC25_CSN_off;
	SPI_Write(CC2500_WRITE_BURST | address);
	for(uint8_t i = 0; i < length; i++)
		SPI_Write(data[i]);
	CC25_CSN_on;
}

void CC2500_WriteData(uint8_t *dpbuffer, uint8_t len)
{
	CC2500_Strobe(CC2500_SFTX);
	CC2500_WriteRegisterMulti(CC2500_3F_TXFIFO, dpbuffer, len);
	CC2500_Strobe(CC2500_STX);
}

void CC2500_SetTxRxMode(uint8_t mode)
{
	if(mode == TX_EN)
	{//from deviation firmware
		CC2500_WriteReg(CC2500_00_IOCFG2, 0x2F);
		CC2500_WriteReg(CC2500_02_IOCFG0, 0x2F | 0x40);
	}
	else
		if (mode == RX_EN)
		{
			CC2500_WriteReg(CC2500_02_IOCFG0, 0x2F);
			CC2500_WriteReg(CC2500_00_IOCFG2, 0x2F | 0x40);
		}
		else
		{
			CC2500_WriteReg(CC2500_02_IOCFG0, 0x2F);
			CC2500_WriteReg(CC2500_00_IOCFG2, 0x2F);
		}
}

//------------------------
/*static void cc2500_resetChip(void)
{
	// Toggle chip select signal
	CC25_CSN_on;
	delayMicroseconds(30);
	CC25_CSN_off;
	delayMicroseconds(30);
	CC25_CSN_on;
	delayMicroseconds(45);
	CC2500_Strobe(CC2500_SRES);
	_delay_ms(100);
}
*/
uint8_t CC2500_Reset()
{
	CC2500_Strobe(CC2500_SRES);
	delayMilliseconds(1);
	CC2500_SetTxRxMode(TXRX_OFF);
	return CC2500_ReadReg(CC2500_0E_FREQ1) == 0xC4;//check if reset
}
/*
static void CC2500_SetPower_Value(uint8_t power)
{
	const unsigned char patable[8]=	{
		0xC5,  // -12dbm
		0x97, // -10dbm
		0x6E, // -8dbm
		0x7F, // -6dbm
		0xA9, // -4dbm
		0xBB, // -2dbm
		0xFE, // 0dbm
		0xFF // 1.5dbm
	};
	if (power > 7)
		power = 7;
	CC2500_WriteReg(CC2500_3E_PATABLE,  patable[power]);
}
*/
void CC2500_SetPower()
{
	uint8_t power=CC2500_BIND_POWER;
	if(IS_BIND_DONE)
		#ifdef CC2500_ENABLE_LOW_POWER
			power=IS_POWER_FLAG_on?CC2500_HIGH_POWER:CC2500_LOW_POWER;
		#else
			power=CC2500_HIGH_POWER;
		#endif
	if(IS_LBT_POWER_on)
	{
		power=CC2500_LBT_POWER;
		LBT_POWER_off;			// Only accept once
	}
	if(IS_RANGE_FLAG_on)
		power=CC2500_RANGE_POWER;
	if(prev_power != power)
	{
		CC2500_WriteReg(CC2500_3E_PATABLE, power);
		prev_power=power;
	}
}

void __attribute__((unused)) CC2500_SetFreqOffset()
{
	if(prev_option != option)
	{
		prev_option = option;
		CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
	}
}

void __attribute__((unused)) CC2500_250K_Init()
{
	CC2500_Strobe(CC2500_SIDLE);

	// Address Config = No address check
	// Base Frequency = 2400
	// CRC Autoflush = false
	// CRC Enable = false
	// Channel Spacing = 333.251953
	// Data Format = Normal mode
	// Data Rate = 249.939
	// Deviation = 126.953125
	// Device Address = 0
	// Manchester Enable = false
	// Modulated = true
	// Modulation Format = GFSK
	// Packet Length Mode = Variable packet length mode. Packet length configured by the first byte after sync word
	// RX Filter BW = 203.125000
	// Sync Word Qualifier Mode = No preamble/sync
	// TX Power = 0
	// Whitening = false
	// Fast Frequency Hopping - no PLL auto calibration
/*	//Previous config
	CC2500_WriteReg(CC2500_08_PKTCTRL0,	0x01);   // Packet Automation Control
	CC2500_WriteReg(CC2500_0B_FSCTRL1,	0x0A);   // Frequency Synthesizer Control
	CC2500_WriteReg(CC2500_0C_FSCTRL0, option);  // Frequency offset hack 
	CC2500_WriteReg(CC2500_0D_FREQ2,	0x5C);   // Frequency Control Word, High Byte
	CC2500_WriteReg(CC2500_0E_FREQ1,	0x4E);   // Frequency Control Word, Middle Byte
	CC2500_WriteReg(CC2500_0F_FREQ0,	0xC3);   // Frequency Control Word, Low Byte
	CC2500_WriteReg(CC2500_10_MDMCFG4,	0x8D);   // Modem Configuration
	CC2500_WriteReg(CC2500_11_MDMCFG3,	0x3B);   // Modem Configuration
	CC2500_WriteReg(CC2500_12_MDMCFG2,	0x10);   // Modem Configuration
	CC2500_WriteReg(CC2500_13_MDMCFG1,	0x23);   // Modem Configuration
	CC2500_WriteReg(CC2500_14_MDMCFG0,	0xA4);   // Modem Configuration
	CC2500_WriteReg(CC2500_15_DEVIATN,	0x62);   // Modem Deviation Setting
	CC2500_WriteReg(CC2500_18_MCSM0,	0x08);   // Main Radio Control State Machine Configuration
	CC2500_WriteReg(CC2500_19_FOCCFG,	0x1D);   // Frequency Offset Compensation Configuration
	CC2500_WriteReg(CC2500_1A_BSCFG,	0x1C);   // Bit Synchronization Configuration
	CC2500_WriteReg(CC2500_1B_AGCCTRL2, 0xC7);   // AGC Control
	CC2500_WriteReg(CC2500_1C_AGCCTRL1, 0x00);   // AGC Control
	CC2500_WriteReg(CC2500_1D_AGCCTRL0, 0xB0);   // AGC Control
	CC2500_WriteReg(CC2500_21_FREND1,	0xB6);   // Front End RX Configuration
	CC2500_WriteReg(CC2500_23_FSCAL3,	0xEA);   // Frequency Synthesizer Calibration
	CC2500_WriteReg(CC2500_25_FSCAL1,	0x00);   // Frequency Synthesizer Calibration
	CC2500_WriteReg(CC2500_26_FSCAL0,	0x11);   // Frequency Synthesizer Calibration
*/
	CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05);   // Packet Automation Control, address check true auto append RSSI & LQI
	CC2500_WriteReg(CC2500_08_PKTCTRL0, 0x00);   // Packet Automation Control, fixed packet len
	CC2500_WriteReg(CC2500_0B_FSCTRL1,  0x0A);   // Frequency Synthesizer Control (IF Frequency)
	CC2500_WriteReg(CC2500_0C_FSCTRL0,  0x00);   // Frequency Synthesizer Control
	CC2500_WriteReg(CC2500_0D_FREQ2,    0x5C);   // Frequency Control Word, High Byte
	CC2500_WriteReg(CC2500_0E_FREQ1,    0x4E);   // Frequency Control Word, Middle Byte
	CC2500_WriteReg(CC2500_0F_FREQ0,    0xC5);   // Frequency Control Word, Low Byte
	CC2500_WriteReg(CC2500_10_MDMCFG4,  0x3D);   // Modem Configuration  Set to 406kHz BW filter
	CC2500_WriteReg(CC2500_11_MDMCFG3,  0x3B);   // Modem Configuration
	CC2500_WriteReg(CC2500_12_MDMCFG2,	0x10);   // Modem Configuration, GFSK, no preambule and no sync word -> TX by default
	CC2500_WriteReg(CC2500_13_MDMCFG1,  0x03);   // Modem Configuration, 2 bytes of preamble
	CC2500_WriteReg(CC2500_14_MDMCFG0,  0xA4);   // Modem Configuration
	CC2500_WriteReg(CC2500_15_DEVIATN,  0x62);   // Modem Deviation Setting
	CC2500_WriteReg(CC2500_18_MCSM0,    0x08);   // Main Radio Control State Machine Configuration
	CC2500_WriteReg(CC2500_19_FOCCFG,   0x1D);   // Frequency Offset Compensation Configuration
	CC2500_WriteReg(CC2500_1A_BSCFG,    0x1C);   // Bit Synchronization Configuration
	CC2500_WriteReg(CC2500_1B_AGCCTRL2, 0xC7);   // AGC Control
	CC2500_WriteReg(CC2500_1C_AGCCTRL1, 0x00);   // AGC Control
	CC2500_WriteReg(CC2500_1D_AGCCTRL0, 0xB0);   // AGC Control
	CC2500_WriteReg(CC2500_21_FREND1,   0xB6);   // Front End RX Configuration
	CC2500_WriteReg(CC2500_23_FSCAL3,   0xEA);   // Frequency Synthesizer Calibration
	CC2500_WriteReg(CC2500_25_FSCAL1,   0x00);   // Frequency Synthesizer Calibration
	CC2500_WriteReg(CC2500_26_FSCAL0,   0x11);   // Frequency Synthesizer Calibration
	
	//Prep RX
	// Set first 3 bytes of rx addr in [0]->SYNC1, [1]->SYNC0 and [2]->ADDR
	// CC2500_WriteReg(CC2500_04_SYNC1,    [0]);   // Sync word, high byte
	// CC2500_WriteReg(CC2500_05_SYNC0,    [1]);   // Sync word, low byte
	// CC2500_WriteReg(CC2500_09_ADDR,     [2]);   // Set addr
	//RX
	// CC2500_WriteReg(CC2500_12_MDMCFG2,  0x12);  // Modem Configuration, GFSK, 16/16 Sync Word TX&RX
	//TX
	// CC2500_WriteReg(CC2500_12_MDMCFG2,	0x10); // Modem Configuration, GFSK, no preambule and no sync word
	// need to set packet length before sending/receiving
	// CC2500_WriteReg(CC2500_06_PKTLEN,   cc2500_packet_len);  // Packet len, fix packet len

	CC2500_SetTxRxMode(TX_EN);
	CC2500_SetPower();
}
void __attribute__((unused)) CC2500_250K_HoppingCalib(uint8_t num_freq)
{
	for (uint8_t i = 0; i < num_freq; i++)
	{
		CC2500_Strobe(CC2500_SIDLE);
		// spacing is 333.25 kHz, must multiply channel by 3
		CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[i]*3);
		// calibrate
		CC2500_Strobe(CC2500_SCAL);
		delayMicroseconds(900);
		calData[i]=CC2500_ReadReg(CC2500_25_FSCAL1);
	}
}
void __attribute__((unused)) CC2500_250K_Hopping(uint8_t index)
{
	// spacing is 333.25 kHz, must multiply channel by 3
	CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[index] * 3);
	// set PLL calibration
	CC2500_WriteReg(CC2500_25_FSCAL1, calData[index]);
}
void __attribute__((unused)) CC2500_250K_RFChannel(uint8_t number)
{
	CC2500_Strobe(CC2500_SIDLE);
	// spacing is 333.25 kHz, must multiply channel by 3
	CC2500_WriteReg(CC2500_0A_CHANNR, number*3);
	// calibrate
	CC2500_Strobe(CC2500_SCAL);
	delayMicroseconds(900);
}
#endif