diff --git a/firmware/export/fmradio_i2c.h b/firmware/export/fmradio_i2c.h index e97ad0d2e1..5d1252768c 100644 --- a/firmware/export/fmradio_i2c.h +++ b/firmware/export/fmradio_i2c.h @@ -22,6 +22,7 @@ #ifndef FMRADIO_I2C_H #define FMRADIO_I2C_H +void fmradio_i2c_init(void); int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count); int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count); diff --git a/firmware/target/arm/as3525/sansa-clip/fmradio-i2c-clip.c b/firmware/target/arm/as3525/sansa-clip/fmradio-i2c-clip.c new file mode 100644 index 0000000000..e3444b8acf --- /dev/null +++ b/firmware/target/arm/as3525/sansa-clip/fmradio-i2c-clip.c @@ -0,0 +1,137 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2006 by Bertrik Sikken + * + * This program 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 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +/* + This is the fmradio_i2c interface, used by the radio driver + to communicate with the radio tuner chip. + + It is implemented using the generic i2c driver, which does "bit-banged" + I2C with a couple of GPIO pins. + */ + +#include "as3525.h" +#include "generic_i2c.h" +#include "fmradio_i2c.h" + +#define I2C_SCL_PIN 4 +#define I2C_SDA_PIN 5 + +static void fm_scl_hi(void) +{ + GPIOB_PIN(I2C_SCL_PIN) = 1 << I2C_SCL_PIN; +} + +static void fm_scl_lo(void) +{ + GPIOB_PIN(I2C_SCL_PIN) = 0; +} + +static void fm_sda_hi(void) +{ + GPIOB_PIN(I2C_SDA_PIN) = 1 << I2C_SDA_PIN; +} + +static void fm_sda_lo(void) +{ + GPIOB_PIN(I2C_SDA_PIN) = 0; +} + +static void fm_sda_input(void) +{ + GPIOB_DIR &= ~(1 << I2C_SDA_PIN); +} + +static void fm_sda_output(void) +{ + GPIOB_DIR |= 1 << I2C_SDA_PIN; +} + +static void fm_scl_input(void) +{ + GPIOB_DIR &= ~(1 << I2C_SCL_PIN); +} + +static void fm_scl_output(void) +{ + GPIOB_DIR |= 1 << I2C_SCL_PIN; +} + +static int fm_sda(void) +{ + return GPIOB_PIN(I2C_SDA_PIN); +} + +static int fm_scl(void) +{ + return GPIOB_PIN(I2C_SCL_PIN); +} + +/* simple and crude delay, used for all delays in the generic i2c driver */ +static void fm_delay(void) +{ + volatile int i; + + /* this loop is uncalibrated and could use more sophistication */ + for (i = 0; i < 100; i++) { + } +} + +/* interface towards the generic i2c driver */ +static struct i2c_interface fm_i2c_interface = { + .address = 0x10 << 1, + + .scl_hi = fm_scl_hi, + .scl_lo = fm_scl_lo, + .sda_hi = fm_sda_hi, + .sda_lo = fm_sda_lo, + .sda_input = fm_sda_input, + .sda_output = fm_sda_output, + .scl_input = fm_scl_input, + .scl_output = fm_scl_output, + .scl = fm_scl, + .sda = fm_sda, + + .delay_hd_sta = fm_delay, + .delay_hd_dat = fm_delay, + .delay_su_dat = fm_delay, + .delay_su_sto = fm_delay, + .delay_su_sta = fm_delay, + .delay_thigh = fm_delay +}; + +/* initialise i2c for fmradio */ +void fmradio_i2c_init(void) +{ + i2c_add_node(&fm_i2c_interface); +} + +int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count) +{ + return i2c_write_data(address, -1, buf, count); +} + +int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count) +{ + return i2c_read_data(address, -1, buf, count); +} + + +