最近不是收音机很火吗，听说中美都要求要有收音机。
[code]#include <Arduino.h>
#define I2C_SEQ 0x10
#define I2C_INDEX 0x11
#define RADIO_REG_2 0x02
#define RADIO_REG_3 0x03
#define RADIO_REG_4 0x04
#define RADIO_REG_5 0x05
#define RADIO_REG_6 0x06
#define RADIO_REG_7 0x07
#define RADIO_REG_A 0x0A
#define RADIO_REG_B 0x0B
#define RADIO_REG_C 0x0C
#define RADIO_REG_D 0x0D
#define RADIO_REG_E 0x0E
#define RADIO_REG_F 0x0F
// Register 2 bits
#define R2_AUDIO_OUTPUT 0x8000
#define R2_MUTE_DISABLE 0x4000
#define R2_MONO_SELECT 0x2000
#define R2_BASS_BOOST 0x1000
#define R2_CLOCK_CAL 0x0800
#define R2_RCLK_DIRECT 0x0400
#define R2_SEEK_UP 0x0200
#define R2_SEEK_ENABLE 0x0100
#define R2_SEEK_NO_WRAP 0x0080
#define R2_CLOCK_MODE 0x0070
#define R2_CLOCK_MODE_32K 0x0000
#define R2_CLOCK_MODE_12M 0x0010
#define R2_CLOCK_MODE_13M 0x0020
#define R2_CLOCK_MODE_19M 0X0030
#define R2_CLOCK_MODE_24M 0X0050
#define R2_CLOCK_MODE_26M 0x0060
#define R2_CLOCK_MODE_38M 0x0070
#define R2_RDS_ENABLE 0x0008
#define R2_NEW_METHOD 0x0004
#define R2_SOFT_RESET 0x0002
#define R2_ENABLE 0x0001
// Register 3 bits
#define R3_CHANNEL 0xFFC0
#define R3_DIRECT_MODE 0x0020
#define R3_TUNE_ENABLE 0x0010
#define R3_BAND 0x000C
#define R3_BAND_US_EU 0x0000
#define R3_BAND_JP 0x0004
#define R3_BAND_WORLD 0x0008
#define R3_BAND_E_EU 0x000C
#define R3_CHAN_SPACING 0x0003
#define R3_CHAN_SPACE_100K 0x0000
#define R3_CHAN_SPACE_200K 0x0001
#define R3_CHAN_SPACE_50K 0x0002
#define R3_CHAN_SPACE_25K 0x0003
// Register 4 bits
#define R4_SEEK_TUNE_IE 0x4000
#define R4_DE_EMPHASIS_50 0x0800
#define R4_SOFT_MUTE_ENABLE 0x0200
#define R4_AFC_DISABLE 0x0100
#define R4_I2S_ENABLE 0x0040
#define R4_GPIO3 0x0030
#define R4_GPIO2 0x000C
#define R4_GPIO1 0x0003
// Register 5 bits
#define R5_INTERRUPT_MODE 0x8000
#define R5_SNR_THRESHOLD 0x0800
#define R5_LNA_PORT 0x0080
#define R5_VOLUME 0x000F
#define RA_RDS_READY 0x8000
#define RA_TUNE_COMPLETE 0x4000
#define RA_SEEK_FAIL 0x2000
#define RA_RDS_SYNC 0x1000
#define RA_RDS_BLK_E 0x0800
#define RA_STEREO 0x0400
#define RA_CHANNEL 0x03FF
#define RB_RSSI 0xFE00
#define RB_IS_STATION 0x0100
#define RB_RDS_BLOCK_E 0x0010
#define RB_RDS_ERR 0x000F
#define RDS_GROUP 0xF800
#define RDS_GROUP_A0 0x0000
#define RDS_GROUP_A2 0x2000
#define RDS_GROUP_A4 0x4000
#define RDS_GROUP_A10 0xA000
#define RDS_GROUP_B0 0x0800
class Radio {
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