Driver for AK2365A FM detector
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Silvano Seva
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1f8a2092b3
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/***************************************************************************
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* Copyright (C) 2024 by Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <interfaces/delays.h>
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#include "AK2365A.h"
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static inline void writeReg(const struct ak2365a *dev, uint8_t reg, uint8_t value)
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{
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uint8_t data[2];
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data[0] = (reg & 0x3f) << 1;
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data[1] = value;
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gpioPin_clear(&dev->cs);
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spi_send(dev->spi, &data, 2);
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gpioPin_set(&dev->cs);
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}
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void AK2365A_init(const struct ak2365a *dev)
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{
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gpioPin_setMode(&dev->cs, OUTPUT);
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gpioPin_setMode(&dev->res, OUTPUT);
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gpioPin_clear(&dev->res);
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gpioPin_set(&dev->cs);
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delayUs(100);
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gpioPin_set(&dev->res);
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writeReg(dev, 0x04, 0xAA); // Software reset
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writeReg(dev, 0x01, 0xC1); // Operating mode 6, LO freq 50.4MHz
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writeReg(dev, 0x02, 0x33); // Enable calibration
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writeReg(dev, 0x03, 0x00); // IF buffer gain 5dB
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writeReg(dev, 0x0B, 0x01); // AGC auto, AGC1 gain 21dB
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writeReg(dev, 0x0C, 0x80); // AGC2 gain 12dB
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}
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void AK2365A_terminate(const struct ak2365a *dev)
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{
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gpioPin_clear(&dev->res);
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}
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void AK2365A_setFilterBandwidth(const struct ak2365a *dev, const uint8_t bw)
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{
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uint8_t reg = 0xE1 | (bw << 2);
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writeReg(dev, 0x01, reg); // Operating mode 7, LO freq. 50.4MHz
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delayMs(1);
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writeReg(dev, 0x01, reg); // Operating mode 7, LO freq. 50.4MHz
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writeReg(dev, 0x02, 0x1E); // AGC time = 3, AGC step 2dB
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writeReg(dev, 0x03, 0x00); // IF buffer gain 5dB
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writeReg(dev, 0x0B, 0x01); // AGC auto, AGC1 gain 21dB
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writeReg(dev, 0x0C, 0x80); // AGC2 gain 12dB
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}
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@ -0,0 +1,76 @@
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/***************************************************************************
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* Copyright (C) 2024 by Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef AK2365A_H
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#define AK2365A_H
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#include <peripherals/gpio.h>
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#include <peripherals/spi.h>
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#include <stdint.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum AK2365A_BPF
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{
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AK2365A_BPF_7p5 = 4, ///< BAND = 1, BPF_BW = 00
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AK2365A_BPF_6 = 0, ///< BAND = 0, BPF_BW = 00
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AK2365A_BPF_4p5 = 1, ///< BAND = 0, BPF_BW = 01
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AK2365A_BPF_3 = 2, ///< BAND = 0, BPF_BW = 10
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AK2365A_BPF_2 = 3, ///< BAND = 0, BPF_BW = 11
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};
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/**
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* AK2365A device data.
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*/
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struct ak2365a
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{
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const struct spiDevice *spi; ///< SPI bus device driver
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const struct gpioPin cs; ///< Chip select gpio
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const struct gpioPin res; ///< Reset gpio
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};
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/**
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* Initialise the FM detector IC.
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*
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* @param dev: pointer to device data.
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*/
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void AK2365A_init(const struct ak2365a *dev);
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/**
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* Terminate the driver and set the IC in reset state.
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*
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* @param dev: pointer to device data.
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*/
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void AK2365A_terminate(const struct ak2365a *dev);
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/**
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* Set the bandwidth of the internal IF filter.
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*
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* @param dev: pointer to device data.
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* @param bw: bandwidth.
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*/
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void AK2365A_setFilterBandwidth(const struct ak2365a *dev, const uint8_t bw);
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#ifdef __cplusplus
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}
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#endif
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#endif /* AK2365A_H */
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