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RF430CL330H_Shield.cpp
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RF430CL330H_Shield.cpp
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/* Copyright 2013-2014 Ten Wong, [email protected]
* https://github.com/awong1900/RF430CL330H_Shield
*/
//the I2C part of this code is heavily borrowed from Adafruit_NFCShield_I2C
//link to original https://github.com/adafruit/Adafruit_NFCShield_I2C
#include "RF430CL330H_Shield.h"
#define I2C_BUFFER_LENGTH 30 //because library Wire's I2C buffer default is 32 bytes
/* Uncomment these lines to enable debug output for RF430(I2C) */
#define RF430DEBUG
/**
** @brief Sends a single byte via I2C
** @param x The byte to send
**/
static inline void wiresend(uint8_t x)
{
#if ARDUINO >= 100
Wire.write((uint8_t)x);
#else
Wire.send(x);
#endif
}
/**
** @brief Reads a single byte via I2C
**/
static inline uint8_t wirerecv(void)
{
#if ARDUINO >= 100
return Wire.read();
#else
return Wire.receive();
#endif
}
/**
** @brief Instantiates a new RF430 class
** @param irq Location of the IRQ pin
** @param reset Location of the RSTPD_N pin
**/
RF430CL330H_Shield::RF430CL330H_Shield(uint8_t irq, uint8_t reset)
{
byte RxData[2] = {0,0};
byte TxData[2] = {0,0};
byte TxAddr[2] = {0,0};
//_irq = irq;
_reset = reset;
//pinMode(_irq, INPUT); //arduino's interrupt do not need init
pinMode(_reset, OUTPUT);
}
/**
** @brief Setups the HW
**/
void RF430CL330H_Shield::begin()
{
Wire.begin();
// Reset the RF430
digitalWrite(_reset, HIGH);
digitalWrite(_reset, LOW);
delay(100); //Reset:low level 100ms
digitalWrite(_reset, HIGH);
}
/**
** @brief Reads the register at reg_addr, returns the result
** @param uint16_t reg_addr RF430 Register address
** @retrun uint16_t the value of register
**/
uint16_t RF430CL330H_Shield::Read_Register(uint16_t reg_addr)
{
TxAddr[0] = reg_addr >> 8; // MSB of address
TxAddr[1] = reg_addr & 0xFF; // LSB of address TxAddr[0]TxAddr[1]
#ifdef RF430DEBUG
Serial.print("Read_Register[0x");Serial.print(reg_addr, HEX);Serial.print("]:0x");
#endif
//send slave addr
Wire.beginTransmission(RF430_I2C_ADDRESS);
wiresend(TxAddr[0]); //bit15~8
wiresend(TxAddr[1]); //bit7~0
Wire.endTransmission();
//resend slave addr with data
Wire.requestFrom((uint8_t)RF430_I2C_ADDRESS, (uint8_t)2);
RxData[0] = wirerecv();
RxData[1] = wirerecv();
//send stop
Wire.endTransmission();
#ifdef RF430DEBUG
Serial.println(RxData[1] << 8 | RxData[0], HEX);
#endif
return RxData[1] << 8 | RxData[0];
}
/**
** @brief Reads one byte data at reg_addr, returns the result
** @param uint16_t reg_addr RF430 Register address (16-bit)
** @retrun uint8_t the value(byte) of register
**/
uint8_t RF430CL330H_Shield::Read_OneByte(uint16_t reg_addr)
{
byte buf[1];
Read_Continuous(reg_addr, buf, 1);
return buf[0];
}
/**
** @brief Continuous read data_length bytes and store in the area "read_data"
** @param uint16_t reg_addr RF430 Register address
** @param uint8_t* read_data buffer for store the data
** @param uint16_t data_length length of data
** @retrun void
**/
void RF430CL330H_Shield::Read_Continuous(uint16_t reg_addr, uint8_t* read_data, uint16_t data_length)
{
uint16_t split_num = 0;
uint16_t remainder = data_length;
uint16_t index= 0;
//splite data avoid beyond the wire buffer
if (data_length > I2C_BUFFER_LENGTH)
{
split_num = data_length / I2C_BUFFER_LENGTH;
remainder = data_length % I2C_BUFFER_LENGTH;
}
for (uint8_t k=0; k < split_num+1; k++)
{
//send slave addr
Wire.beginTransmission(RF430_I2C_ADDRESS);
TxAddr[0] = reg_addr >> 8; // MSB of address
TxAddr[1] = reg_addr & 0xFF; // LSB of address
wiresend(TxAddr[0]); //bit15~8
wiresend(TxAddr[1]); //bit7~0
Wire.endTransmission();
if (k != split_num)
{
//resend slave addr with data
Wire.requestFrom((uint8_t)RF430_I2C_ADDRESS, (uint8_t)I2C_BUFFER_LENGTH);
while (Wire.available())
{
for (uint8_t i=0; i < I2C_BUFFER_LENGTH; i++)
read_data[index+i] = wirerecv();
}
//increase addr
index += I2C_BUFFER_LENGTH;
reg_addr += I2C_BUFFER_LENGTH;
}
else
{
//resend slave addr with data
Wire.requestFrom((uint8_t)RF430_I2C_ADDRESS, remainder);
while (Wire.available())
{
for (uint8_t i=0; i < remainder; i++)
read_data[index+i] = wirerecv();
}
}
//send stop
Wire.endTransmission();
}
#ifdef RF430DEBUG
Serial.print("RxData[] = 0x");
for (uint8_t i=0; i<data_length; i++)
{Serial.print(read_data[i], HEX);Serial.print(" ");}
Serial.println("");
#endif
}
/**
** @brief writes the register at reg_addr with value
** @param uint16_t reg_addr RF430 Register address
** @param uint16_t value writted value
** @retrun void
**/
void RF430CL330H_Shield::Write_Register(uint16_t reg_addr, uint16_t value)
{
TxAddr[0] = reg_addr >> 8; // MSB of address
TxAddr[1] = reg_addr & 0xFF; // LSB of address
TxData[0] = value >> 8;
TxData[1] = value & 0xFF;
#ifdef RF430DEBUG
Serial.print("Write_Register[0x");Serial.print(reg_addr, HEX);
Serial.print("]:0x");Serial.println(value, HEX);
#endif
//send slave addr
Wire.beginTransmission(RF430_I2C_ADDRESS);
wiresend(TxAddr[0]); //bit15~8
wiresend(TxAddr[1]); //bit7~0
//send value
wiresend(TxData[1]); //bit7~0
wiresend(TxData[0]); //bit15~8
//send stop
Wire.endTransmission();
}
/**
** @brief writes the register at reg_addr and incrementing addresses with the data at "write_data" of length data_length
** @param uint16_t reg_addr RF430 Register address
** @param uint8_t* write_data buffer for store the data
** @param uint16_t data_length length of data
** @retrun void
**/
void RF430CL330H_Shield::Write_Continuous(uint16_t reg_addr, uint8_t* write_data, uint16_t data_length)
{
uint16_t split_num = 0;
uint16_t remainder = data_length;
uint16_t index=0;
#ifdef RF430DEBUG
Serial.print("start_addr = 0x");Serial.println(reg_addr, HEX);
Serial.print("data_length = 0x");Serial.println(data_length, HEX);
Serial.print("write_data[] = ");
for (uint8_t i=0; i<data_length; i++)
{Serial.print(write_data[i], HEX);Serial.print(" ");}
Serial.println();
#endif
//splite data avoid beyond the wire buffer
if(data_length > I2C_BUFFER_LENGTH)
{
split_num = data_length / I2C_BUFFER_LENGTH;
remainder = data_length % I2C_BUFFER_LENGTH;
}
for (int k=0; k < split_num+1; k++)
{
//send slave addr
Wire.beginTransmission(RF430_I2C_ADDRESS);
//Serial.print("reg_addr = 0x");Serial.println(reg_addr, HEX);
TxAddr[0] = reg_addr >> 8; // MSB of address
TxAddr[1] = reg_addr & 0xFF; // LSB of address
wiresend(TxAddr[0]); //bit15~8
wiresend(TxAddr[1]); //bit7~0
if (k != split_num)
{
//send data
for (uint8_t i=0; i < I2C_BUFFER_LENGTH; i++)
wiresend(write_data[index+i]);
//increase addr
index += I2C_BUFFER_LENGTH;
reg_addr += I2C_BUFFER_LENGTH;
}
else
{
//send data
for (uint8_t i=0; i < remainder; i++)
wiresend(write_data[index+i]);
}
//send stop
Wire.endTransmission();
}
}