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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
* Othmar Gsenger <otti@wirdorange.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils 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
* any later version.
*
* spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include "LUFA/Drivers/Peripheral/TWI.h"
#include <stdio.h>
#include "rda1846.h"
#define RDA1846_CHIP_ADDR 0xE2
#define RDA1846_ADDR_W (0<<7)
#define RDA1846_ADDR_R (1<<7)
#define RDA1846_ADDR_LIMIT 0x7F
#define RDA1846_RF_BAND_2M 0x00C0
#define RDA1846_BAND_LOW 134000
#define RDA1846_BAND_HIGH 174000
#define RDA1846_XTAL_FREQ 12288
#define RDA1846_ADCLK_FREQ 6144
#define RDA1846_CLK_MODE (1<<0)
#define RDA1846_REG_CLK_MODE 0x04
#define RDA1846_REG_RF_BAND 0x0F
#define RDA1846_REG_FREQH 0x29
#define RDA1846_REG_FREQL 0x2A
#define RDA1846_REG_XTAL 0x2B
#define RDA1846_REG_ADCLK 0x2C
static uint8_t rda1846_write_register_raw(const uint8_t addr, const uint16_t data)
{
if(TWI_StartTransmission(RDA1846_CHIP_ADDR | TWI_ADDRESS_WRITE,10) != TWI_ERROR_NoError)
return 1;
if(!TWI_SendByte(addr | RDA1846_ADDR_W))
goto i2c_error;
if(!TWI_SendByte((uint8_t)(data>>8)))
goto i2c_error;
if(!TWI_SendByte((uint8_t)data))
goto i2c_error;
TWI_StopTransmission();
return 0;
i2c_error:
TWI_StopTransmission();
return 1;
}
static uint8_t rda1846_read_register_raw(const uint8_t addr, uint16_t* data)
{
if(TWI_StartTransmission(RDA1846_CHIP_ADDR | TWI_ADDRESS_WRITE,10) != TWI_ERROR_NoError)
return 1;
if(!TWI_SendByte(addr | RDA1846_ADDR_R))
goto i2c_error;
if(TWI_StartTransmission(RDA1846_CHIP_ADDR | TWI_ADDRESS_READ,10) != TWI_ERROR_NoError)
goto i2c_error;
uint8_t tmp;
if(!TWI_ReceiveByte(&tmp, 0))
goto i2c_error;
*data = tmp << 8;
if(!TWI_ReceiveByte(&tmp, 1))
goto i2c_error;
*data |= tmp;
TWI_StopTransmission();
return 0;
i2c_error:
TWI_StopTransmission();
return 1;
}
static uint8_t rda1846_write_register(const uint8_t addr, const uint16_t data)
{
if(addr < RDA1846_ADDR_LIMIT)
return rda1846_write_register_raw(addr, data);
if(addr > RDA1846_ADDR_LIMIT) {
uint8_t ret = rda1846_write_register_raw(RDA1846_ADDR_LIMIT, 1);
if(ret) return ret;
ret = rda1846_write_register_raw(addr, data);
if(ret) return ret;
return rda1846_write_register_raw(RDA1846_ADDR_LIMIT, 0);
}
return 1;
}
static uint8_t rda1846_read_register(const uint8_t addr, uint16_t* data)
{
if(addr < RDA1846_ADDR_LIMIT)
return rda1846_read_register_raw(addr, data);
if(addr > RDA1846_ADDR_LIMIT) {
uint8_t ret = rda1846_write_register_raw(RDA1846_ADDR_LIMIT, 1);
if(ret) return ret;
ret = rda1846_read_register_raw(addr - RDA1846_ADDR_LIMIT + 1, data);
if(ret) return ret;
return rda1846_write_register_raw(RDA1846_ADDR_LIMIT, 0);
}
return 1;
}
void rda1846_init(void)
{
TWI_Init(TWI_BIT_PRESCALE_1, TWI_BITLENGTH_FROM_FREQ(1, 200000));
// switch to 2m Band (134 ~ 174 MHz)
rda1846_write_register(RDA1846_REG_RF_BAND, RDA1846_RF_BAND_2M);
// set crystal frequency (12.288 MHz)
rda1846_write_register(RDA1846_REG_XTAL, RDA1846_XTAL_FREQ);
rda1846_write_register(RDA1846_ADCLK_FREQ, RDA1846_REG_ADCLK);
rda1846_write_register(RDA1846_CLK_MODE, RDA1846_REG_CLK_MODE);
}
int32_t rda1846_get_freq_kHz(void)
{
int32_t freq;
uint16_t data;
uint8_t ret = rda1846_read_register(RDA1846_REG_FREQH, &data);
if(ret)
return -1;
freq = (((uint32_t)data)<<16);
ret = rda1846_read_register(RDA1846_REG_FREQL, &data);
if(ret)
return -1;
freq |= data;
return (freq>>3);
}
uint8_t rda1846_set_freq_kHz(int32_t freq)
{
if(freq < RDA1846_BAND_LOW || freq > RDA1846_BAND_HIGH)
return 1;
freq = freq<<3;
uint8_t ret = rda1846_write_register(RDA1846_REG_FREQH, (uint16_t)(freq>>16));
if(ret)
return 1;
return rda1846_write_register(RDA1846_REG_FREQL, (uint16_t)(freq & 0x0000FFFF));
}
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