--- /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 2008 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Low-level TWI module for ARM (inplementation).
+ *
+ * \version $Id$
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ * This module is automatically included so no need to include
+ * in test list.
+ * notest: arm
+ *
+ */
+
+#include <cpu/detect.h>
+
+#if CPU_ARM_AT91
+ #include "twi_at91.c"
+/*#elif Add other ARM families here */
+#else
+ #error Unknown CPU
+#endif
--- /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 2008 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Low-level TWI module for ARM (interface).
+ *
+ * \version $Id$
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ */
+
+#include <cpu/detect.h>
+
+#if CPU_ARM_AT91
+ #include "twi_at91.h"
+/*#elif Add other ARM families here */
+#else
+ #error Unknown CPU
+#endif
--- /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 2008 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Driver for the AT91 ARM TWI (implementation)
+ *
+ * \version $Id$
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#include "twi_at91.h"
+
+#include "cfg/cfg_twi.h"
+#include <cfg/compiler.h>
+#include <cfg/debug.h>
+#include <cfg/macros.h>
+#include <cfg/module.h>
+
+#include <drv/timer.h>
+
+#include <io/arm.h>
+
+/**
+ * Timeout for ACK slave waiting.
+ */
+#define TWI_TIMEOUT ms_to_ticks(50)
+
+/**
+ * Send \a size bytes over the twi line to slave \a id.
+ * If the device requires internal addressing before writing, \a byte1 \a byte2 and \a byte3 can
+ * be specified. Internal addressign bytes not used *must* be set to TWI_NO_IADDR. If 1 or 2 bytes
+ * are required for internal addressing you *must* first use \a byte1 and than \a byte2.
+ * \note Atmel TWI implementation is broken so it was not possible to supply a better
+ * interface. Additionally NACK handling is also broken, so if the i2c device reply nack
+ * this function will return after TWI_TIMEOUT.
+ * \return true if ok, false on slave timeout.
+ */
+bool twi_write(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, const void *_buf, size_t size)
+{
+ uint8_t addr_size = 0;
+ const uint8_t *buf = (const uint8_t *)_buf;
+ ticks_t start;
+
+ /* At least 1 byte *must* be transmitted, thanks to crappy hw implementation */
+ ASSERT(size >= 1);
+
+ /* Check internal byte address presence */
+ if (byte1 != TWI_NO_IADDR)
+ addr_size++;
+
+ if (byte2 != TWI_NO_IADDR)
+ {
+ ASSERT(addr_size == 1);
+ addr_size++;
+ }
+
+ if (byte3 != TWI_NO_IADDR)
+ {
+ ASSERT(addr_size == 2);
+ addr_size++;
+ }
+
+ start = timer_clock();
+ /* Wait tx buffer empty */
+ while (!(TWI_SR & BV(TWI_TXRDY)))
+ {
+ if (timer_clock() - start > TWI_TIMEOUT)
+ return false;
+ }
+
+ /* Set slave address and (optional) internal slave addresses */
+ TWI_MMR = (uint32_t)id << TWI_DADR_SHIFT | (uint32_t)addr_size << TWI_IADRSZ_SHIFT;
+
+ TWI_IADR = ((uint32_t)(byte3 & 0xff) << 16) | ((uint32_t)(byte2 & 0xff) << 8) | ((uint32_t)(byte1 & 0xff));
+
+ while (size--)
+ {
+ /* Send data */
+ TWI_THR = *buf++;
+
+ start = timer_clock();
+ /* Wait tx buffer empty */
+ while (!(TWI_SR & BV(TWI_TXRDY)))
+ {
+ if (timer_clock() - start > TWI_TIMEOUT)
+ return false;
+ }
+ }
+
+ /* Wait transmit complete bit */
+ start = timer_clock();
+ while (!(TWI_SR & BV(TWI_TXCOMP)))
+ {
+ if (timer_clock() - start > TWI_TIMEOUT)
+ return false;
+ }
+
+ return true;
+}
+
+
+/**
+ * Read \a size bytes from the twi line from slave \a id.
+ * If the device requires internal addressing before reading, \a byte1 \a byte2 and \a byte3 must
+ * be specified. Internal addressign bytes not used *must* be set to TWI_NO_IADDR. If 1 or 2 bytes
+ * are required for internal addressing you *must* first use \a byte1 and than \a byte2.
+ * \note Atmel TWI implementation is broken so it was not possible to supply a better
+ * interface. Additionally NACK handling is also broken, so if the i2c device reply nack
+ * this function will return after TWI_TIMEOUT.
+ * \return true if ok, false on slave timeout.
+ */
+bool twi_read(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, void *_buf, size_t size)
+{
+ uint8_t addr_size = 0;
+ uint8_t *buf = (uint8_t *)_buf;
+ bool stopped = false;
+ ticks_t start;
+
+ /* At least 1 byte *must* be transmitted, thanks to crappy twi implementation */
+ ASSERT(size >= 1);
+
+ /* Check internal byte address presence */
+ if (byte1 != TWI_NO_IADDR)
+ addr_size++;
+
+ if (byte2 != TWI_NO_IADDR)
+ {
+ ASSERT(addr_size == 1);
+ addr_size++;
+ }
+
+ if (byte3 != TWI_NO_IADDR)
+ {
+ ASSERT(addr_size == 2);
+ addr_size++;
+ }
+
+ /* Wait tx buffer empty */
+ start = timer_clock();
+ while (!(TWI_SR & BV(TWI_TXRDY)))
+ {
+ if (timer_clock() - start > TWI_TIMEOUT)
+ return false;
+ }
+
+
+ /* Set slave address and (optional) internal slave addresses */
+ TWI_MMR = ((uint32_t)id << TWI_DADR_SHIFT) | BV(TWI_MREAD) | ((uint32_t)addr_size << TWI_IADRSZ_SHIFT);
+
+ TWI_IADR = ((uint32_t)(byte3 & 0xff) << 16) | ((uint32_t)(byte2 & 0xff) << 8) | ((uint32_t)(byte1 & 0xff));
+
+ /*
+ * Start reception.
+ * Kludge: if we want to receive only 1 byte, the stop but *must* be set here
+ * (thanks to crappy twi implementation again).
+ */
+ if (size == 1)
+ {
+ TWI_CR = BV(TWI_START) | BV(TWI_STOP);
+ stopped = true;
+ }
+ else
+ TWI_CR = BV(TWI_START);
+
+ while (size--)
+ {
+ /* If we are at the last byte, inform the crappy hw that we
+ want to stop the reception. */
+ if (!size && !stopped)
+ TWI_CR = BV(TWI_STOP);
+
+ /* Wait until a byte is received */
+ start = timer_clock();
+ while (!(TWI_SR & BV(TWI_RXRDY)))
+ {
+ if (timer_clock() - start > TWI_TIMEOUT)
+ {
+ TWI_CR = BV(TWI_STOP);
+ return false;
+ }
+ }
+
+
+ *buf++ = TWI_RHR;
+ }
+
+ /* Wait transmit complete bit */
+ start = timer_clock();
+ while (!(TWI_SR & BV(TWI_TXCOMP)))
+ {
+ if (timer_clock() - start > TWI_TIMEOUT)
+ return false;
+ }
+
+ return true;
+}
+
+MOD_DEFINE(twi);
+
+/**
+ * Init the (broken) sam7 twi driver.
+ */
+void twi_init(void)
+{
+ /* Disable PIO on TWI pins */
+ PIOA_PDR = BV(TWD) | BV(TWCK);
+
+ /* Enable oper drain on TWI pins */
+ PIOA_MDER = BV(TWD);
+
+ /* Disable all irqs */
+ TWI_IDR = 0xFFFFFFFF;
+
+ TWI_CR = BV(TWI_SWRST);
+
+ /* Enable master mode */
+ TWI_CR = BV(TWI_MSEN);
+
+ PMC_PCER = BV(TWI_ID);
+
+ /*
+ * Compute twi clock.
+ * CLDIV = ((Tlow * 2^CKDIV) -3) * Tmck
+ * CHDIV = ((THigh * 2^CKDIV) -3) * Tmck
+ * Only CLDIV is computed since CLDIV = CHDIV (50% duty cycle)
+ */
+ uint16_t cldiv, ckdiv = 0;
+ while ((cldiv = ((CLOCK_FREQ / (2 * CONFIG_TWI_FREQ)) - 3) / (1 << ckdiv)) > 255)
+ ckdiv++;
+
+ /* Atmel errata states that ckdiv *must* be less than 5 for unknown reason */
+ ASSERT(ckdiv < 5);
+
+ TWI_CWGR = ((uint32_t)ckdiv << TWI_CKDIV_SHIFT) | (cldiv << TWI_CLDIV_SHIFT) | (cldiv << TWI_CHDIV_SHIFT);
+ TRACEMSG("TWI_CWGR [%08lx]", TWI_CWGR);
+
+ MOD_INIT(twi);
+}
+
--- /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/)
+ *
+ * -->
+ *
+ * \brief Driver for the AT91 ARM TWI (implementation)
+ *
+ * \version $Id$
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+
+#ifndef DRV_AT91_TWI_H
+#define DRV_AT91_TWI_H
+
+#include <cfg/compiler.h>
+
+typedef int16_t twi_iaddr_t;
+
+#define TWI_NO_IADDR (-1)
+
+void twi_init(void);
+bool twi_read(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, void *_buf, size_t len);
+bool twi_write(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, const void *_buf, size_t len);
+
+#endif /* DRV_AT91_TWI_H */
+++ /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 2008 Develer S.r.l. (http://www.develer.com/)
- *
- * -->
- *
- * \brief Low-level TWI module for ARM (inplementation).
- *
- * \version $Id$
- *
- * \author Daniele Basile <asterix@develer.com>
- *
- * This module is automatically included so no need to include
- * in test list.
- * notest: arm
- *
- */
-
-#include <cpu/detect.h>
-
-#if CPU_ARM_AT91
- #include "twi_at91.c"
-/*#elif Add other ARM families here */
-#else
- #error Unknown CPU
-#endif
+++ /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 2008 Develer S.r.l. (http://www.develer.com/)
- *
- * -->
- *
- * \brief Low-level TWI module for ARM (interface).
- *
- * \version $Id$
- *
- * \author Daniele Basile <asterix@develer.com>
- *
- */
-
-#include <cpu/detect.h>
-
-#if CPU_ARM_AT91
- #include "twi_at91.h"
-/*#elif Add other ARM families here */
-#else
- #error Unknown CPU
-#endif
+++ /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 2008 Develer S.r.l. (http://www.develer.com/)
- *
- * -->
- *
- * \brief Driver for the AT91 ARM TWI (implementation)
- *
- * \version $Id$
- *
- * \author Francesco Sacchi <batt@develer.com>
- */
-
-#include "twi_at91.h"
-
-#include "cfg/cfg_twi.h"
-#include <cfg/compiler.h>
-#include <cfg/debug.h>
-#include <cfg/macros.h>
-#include <cfg/module.h>
-
-#include <drv/timer.h>
-
-#include <io/arm.h>
-
-/**
- * Timeout for ACK slave waiting.
- */
-#define TWI_TIMEOUT ms_to_ticks(50)
-
-/**
- * Send \a size bytes over the twi line to slave \a id.
- * If the device requires internal addressing before writing, \a byte1 \a byte2 and \a byte3 can
- * be specified. Internal addressign bytes not used *must* be set to TWI_NO_IADDR. If 1 or 2 bytes
- * are required for internal addressing you *must* first use \a byte1 and than \a byte2.
- * \note Atmel TWI implementation is broken so it was not possible to supply a better
- * interface. Additionally NACK handling is also broken, so if the i2c device reply nack
- * this function will return after TWI_TIMEOUT.
- * \return true if ok, false on slave timeout.
- */
-bool twi_write(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, const void *_buf, size_t size)
-{
- uint8_t addr_size = 0;
- const uint8_t *buf = (const uint8_t *)_buf;
- ticks_t start;
-
- /* At least 1 byte *must* be transmitted, thanks to crappy hw implementation */
- ASSERT(size >= 1);
-
- /* Check internal byte address presence */
- if (byte1 != TWI_NO_IADDR)
- addr_size++;
-
- if (byte2 != TWI_NO_IADDR)
- {
- ASSERT(addr_size == 1);
- addr_size++;
- }
-
- if (byte3 != TWI_NO_IADDR)
- {
- ASSERT(addr_size == 2);
- addr_size++;
- }
-
- start = timer_clock();
- /* Wait tx buffer empty */
- while (!(TWI_SR & BV(TWI_TXRDY)))
- {
- if (timer_clock() - start > TWI_TIMEOUT)
- return false;
- }
-
- /* Set slave address and (optional) internal slave addresses */
- TWI_MMR = (uint32_t)id << TWI_DADR_SHIFT | (uint32_t)addr_size << TWI_IADRSZ_SHIFT;
-
- TWI_IADR = ((uint32_t)(byte3 & 0xff) << 16) | ((uint32_t)(byte2 & 0xff) << 8) | ((uint32_t)(byte1 & 0xff));
-
- while (size--)
- {
- /* Send data */
- TWI_THR = *buf++;
-
- start = timer_clock();
- /* Wait tx buffer empty */
- while (!(TWI_SR & BV(TWI_TXRDY)))
- {
- if (timer_clock() - start > TWI_TIMEOUT)
- return false;
- }
- }
-
- /* Wait transmit complete bit */
- start = timer_clock();
- while (!(TWI_SR & BV(TWI_TXCOMP)))
- {
- if (timer_clock() - start > TWI_TIMEOUT)
- return false;
- }
-
- return true;
-}
-
-
-/**
- * Read \a size bytes from the twi line from slave \a id.
- * If the device requires internal addressing before reading, \a byte1 \a byte2 and \a byte3 must
- * be specified. Internal addressign bytes not used *must* be set to TWI_NO_IADDR. If 1 or 2 bytes
- * are required for internal addressing you *must* first use \a byte1 and than \a byte2.
- * \note Atmel TWI implementation is broken so it was not possible to supply a better
- * interface. Additionally NACK handling is also broken, so if the i2c device reply nack
- * this function will return after TWI_TIMEOUT.
- * \return true if ok, false on slave timeout.
- */
-bool twi_read(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, void *_buf, size_t size)
-{
- uint8_t addr_size = 0;
- uint8_t *buf = (uint8_t *)_buf;
- bool stopped = false;
- ticks_t start;
-
- /* At least 1 byte *must* be transmitted, thanks to crappy twi implementation */
- ASSERT(size >= 1);
-
- /* Check internal byte address presence */
- if (byte1 != TWI_NO_IADDR)
- addr_size++;
-
- if (byte2 != TWI_NO_IADDR)
- {
- ASSERT(addr_size == 1);
- addr_size++;
- }
-
- if (byte3 != TWI_NO_IADDR)
- {
- ASSERT(addr_size == 2);
- addr_size++;
- }
-
- /* Wait tx buffer empty */
- start = timer_clock();
- while (!(TWI_SR & BV(TWI_TXRDY)))
- {
- if (timer_clock() - start > TWI_TIMEOUT)
- return false;
- }
-
-
- /* Set slave address and (optional) internal slave addresses */
- TWI_MMR = ((uint32_t)id << TWI_DADR_SHIFT) | BV(TWI_MREAD) | ((uint32_t)addr_size << TWI_IADRSZ_SHIFT);
-
- TWI_IADR = ((uint32_t)(byte3 & 0xff) << 16) | ((uint32_t)(byte2 & 0xff) << 8) | ((uint32_t)(byte1 & 0xff));
-
- /*
- * Start reception.
- * Kludge: if we want to receive only 1 byte, the stop but *must* be set here
- * (thanks to crappy twi implementation again).
- */
- if (size == 1)
- {
- TWI_CR = BV(TWI_START) | BV(TWI_STOP);
- stopped = true;
- }
- else
- TWI_CR = BV(TWI_START);
-
- while (size--)
- {
- /* If we are at the last byte, inform the crappy hw that we
- want to stop the reception. */
- if (!size && !stopped)
- TWI_CR = BV(TWI_STOP);
-
- /* Wait until a byte is received */
- start = timer_clock();
- while (!(TWI_SR & BV(TWI_RXRDY)))
- {
- if (timer_clock() - start > TWI_TIMEOUT)
- {
- TWI_CR = BV(TWI_STOP);
- return false;
- }
- }
-
-
- *buf++ = TWI_RHR;
- }
-
- /* Wait transmit complete bit */
- start = timer_clock();
- while (!(TWI_SR & BV(TWI_TXCOMP)))
- {
- if (timer_clock() - start > TWI_TIMEOUT)
- return false;
- }
-
- return true;
-}
-
-MOD_DEFINE(twi);
-
-/**
- * Init the (broken) sam7 twi driver.
- */
-void twi_init(void)
-{
- /* Disable PIO on TWI pins */
- PIOA_PDR = BV(TWD) | BV(TWCK);
-
- /* Enable oper drain on TWI pins */
- PIOA_MDER = BV(TWD);
-
- /* Disable all irqs */
- TWI_IDR = 0xFFFFFFFF;
-
- TWI_CR = BV(TWI_SWRST);
-
- /* Enable master mode */
- TWI_CR = BV(TWI_MSEN);
-
- PMC_PCER = BV(TWI_ID);
-
- /*
- * Compute twi clock.
- * CLDIV = ((Tlow * 2^CKDIV) -3) * Tmck
- * CHDIV = ((THigh * 2^CKDIV) -3) * Tmck
- * Only CLDIV is computed since CLDIV = CHDIV (50% duty cycle)
- */
- uint16_t cldiv, ckdiv = 0;
- while ((cldiv = ((CLOCK_FREQ / (2 * CONFIG_TWI_FREQ)) - 3) / (1 << ckdiv)) > 255)
- ckdiv++;
-
- /* Atmel errata states that ckdiv *must* be less than 5 for unknown reason */
- ASSERT(ckdiv < 5);
-
- TWI_CWGR = ((uint32_t)ckdiv << TWI_CKDIV_SHIFT) | (cldiv << TWI_CLDIV_SHIFT) | (cldiv << TWI_CHDIV_SHIFT);
- TRACEMSG("TWI_CWGR [%08lx]", TWI_CWGR);
-
- MOD_INIT(twi);
-}
-
+++ /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/)
- *
- * -->
- *
- * \brief Driver for the AT91 ARM TWI (implementation)
- *
- * \version $Id$
- *
- * \author Francesco Sacchi <batt@develer.com>
- */
-
-
-#ifndef DRV_AT91_TWI_H
-#define DRV_AT91_TWI_H
-
-#include <cfg/compiler.h>
-
-typedef int16_t twi_iaddr_t;
-
-#define TWI_NO_IADDR (-1)
-
-void twi_init(void);
-bool twi_read(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, void *_buf, size_t len);
-bool twi_write(uint8_t id, twi_iaddr_t byte1, twi_iaddr_t byte2, twi_iaddr_t byte3, const void *_buf, size_t len);
-
-#endif /* DRV_AT91_TWI_H */
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