/// Comunication frequency
#define CONFIG_I2C_FREQ 100000UL
+/**
+ * I2C start timeout: for how many milliseconds
+ * the twi_start should try to get an ACK before
+ * returning error.
+ */
+#define CONFIG_I2C_START_TIMEOUT 100
+
#endif /* CFG_I2C_H */
* \author Bernie Innocenti <bernie@codewiz.org>
*/
-#include "i2c_avr.h"
-
#include "hw/hw_cpu.h" /* CLOCK_FREQ */
#include "cfg/cfg_i2c.h"
#include <cpu/detect.h>
#include <cpu/irq.h>
#include <drv/timer.h>
+#include <drv/i2c.h>
#include <compat/twi.h>
/* Wait for TWINT flag set: bus is ready */
#define WAIT_TWI_READY do {} while (!(TWCR & BV(TWINT)))
-#define READ_BIT BV(0)
-
-
/**
* Send START condition on the bus.
*
return (int)(uint8_t)TWDR;
}
-
-/**
- * Send a sequence of bytes in master transmitter mode
- * to the selected slave device through the TWI bus.
- *
- * \return true on success, false on error.
- */
-bool i2c_send(const void *_buf, size_t count)
-{
- const uint8_t *buf = (const uint8_t *)_buf;
-
- while (count--)
- {
- if (!i2c_put(*buf++))
- return false;
- }
- return true;
-}
-
-
-/**
- * Receive a sequence of one or more bytes from the
- * selected slave device in master receive mode through
- * the TWI bus.
- *
- * Received data is placed in \c buf.
- *
- * \note a NACK is automatically given on the last received
- * byte.
- *
- * \return true on success, false on error
- */
-bool i2c_recv(void *_buf, size_t count)
-{
- uint8_t *buf = (uint8_t *)_buf;
-
- /*
- * When reading the last byte the TWEA bit is not
- * set, and the eeprom should answer with NACK
- */
- while (count--)
- {
- /*
- * The last byte read does not has an ACK
- * to stop communication.
- */
- int c = i2c_get(count);
-
- if (c == EOF)
- return false;
- else
- *buf++ = c;
- }
-
- return true;
-}
-
-
MOD_DEFINE(i2c);
/**
* Set speed:
* F = CLOCK_FREQ / (16 + 2*TWBR * 4^TWPS)
*/
- #ifndef CONFIG_TWI_FREQ
- #warning Using default value of 300000L for CONFIG_TWI_FREQ
- #define CONFIG_TWI_FREQ 300000L /* ~300 kHz */
+ #ifndef CONFIG_I2C_FREQ
+ #warning Using default value of 300000L for CONFIG_I2C_FREQ
+ #define CONFIG_I2C_FREQ 300000L /* ~300 kHz */
#endif
#define TWI_PRESC 1 /* 4 ^ TWPS */
- TWBR = (CLOCK_FREQ / (2 * CONFIG_TWI_FREQ * TWI_PRESC)) - (8 / TWI_PRESC);
+ TWBR = (CLOCK_FREQ / (2 * CONFIG_I2C_FREQ * TWI_PRESC)) - (8 / TWI_PRESC);
TWSR = 0;
TWCR = BV(TWEN);
);
+++ /dev/null
-/**
- * \file
- * <!--
- * This file is part of BeRTOS.
- *
- * Bertos 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 program 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 this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * As a special exception, you may use this file as part of a free software
- * library without restriction. Specifically, if other files instantiate
- * templates or use macros or inline functions from this file, or you compile
- * this file and link it with other files to produce an executable, this
- * file does not by itself cause the resulting executable to be covered by
- * the GNU General Public License. This exception does not however
- * invalidate any other reasons why the executable file might be covered by
- * the GNU General Public License.
- *
- * Copyright 2003, 2004, 2005 Develer S.r.l. (http://www.develer.com/)
- *
- * -->
- *
- * \version $Id$
- *
- * \author Stefano Fedrigo <aleph@develer.com>
- * \author Bernie Innocenti <bernie@codewiz.org>
- *
- * \brief Driver for the AVR ATMega TWI (interface)
- */
-
-#ifndef DRV_I2C_H
-#define DRV_I2C_H
-
-#include <cfg/compiler.h>
-
-bool i2c_start_w(uint8_t id);
-bool i2c_start_r(uint8_t id);
-void i2c_stop(void);
-bool i2c_put(const uint8_t data);
-bool i2c_send(const void *_buf, size_t count);
-int i2c_get(bool ack);
-bool i2c_recv(void *_buf, size_t count);
-void i2c_init(void);
-
-#endif /* DRV_I2C_H */
#include <cfg/compiler.h>
-bool i2c_init(void);
+#define READ_BIT BV(0)
+
+void i2c_init(void);
bool i2c_start_w(uint8_t id);
bool i2c_start_r(uint8_t id);
void i2c_stop(void);
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