131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
/*
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* File : at91_i2c_gpio.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2012-04-25 weety first version
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*/
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#include <rtdevice.h>
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#include <rthw.h>
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#include <at91sam926x.h>
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static void at91_i2c_gpio_init()
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{
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at91_sys_write(AT91_PMC_PCER, 1 << AT91SAM9260_ID_PIOA); //enable PIOA clock
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at91_sys_write(AT91_PIOA + PIO_PUER, (1 << 23));
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at91_sys_write(AT91_PIOA + PIO_PER, (1 << 23));
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at91_sys_write(AT91_PIOA + PIO_MDER, (1 << 23));
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at91_sys_write(AT91_PIOA + PIO_PUER, (1 << 24));
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at91_sys_write(AT91_PIOA + PIO_PER, (1 << 24));
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at91_sys_write(AT91_PIOA + PIO_MDER, (1 << 24));
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at91_sys_write(AT91_PIOA + PIO_OER, (1 << 23));
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at91_sys_write(AT91_PIOA + PIO_OER, (1 << 24));
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at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 23));
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at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 24));
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}
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static void at91_set_sda(void *data, rt_int32_t state)
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{
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if (state)
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{
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at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 23));
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}
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else
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{
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at91_sys_write(AT91_PIOA + PIO_CODR, (1 << 23));
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}
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}
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static void at91_set_scl(void *data, rt_int32_t state)
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{
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if (state)
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{
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at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 24));
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}
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else
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{
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at91_sys_write(AT91_PIOA + PIO_CODR, (1 << 24));
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}
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}
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static rt_int32_t at91_get_sda(void *data)
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{
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return at91_sys_read(AT91_PIOA + PIO_PDSR) & (1 << 23);
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}
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static rt_int32_t at91_get_scl(void *data)
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{
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return at91_sys_read(AT91_PIOA + PIO_PDSR) & (1 << 24);
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}
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static void at91_udelay (rt_uint32_t us)
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{
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rt_int32_t i;
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for (; us > 0; us--)
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{
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i = 50000;
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while(i > 0)
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{
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i--;
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}
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}
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}
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static const struct rt_i2c_bit_ops bit_ops = {
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RT_NULL,
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at91_set_sda,
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at91_set_scl,
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at91_get_sda,
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at91_get_scl,
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at91_udelay,
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5,
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100
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};
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int at91_i2c_init(void)
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{
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struct rt_i2c_bus_device *bus;
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bus = rt_malloc(sizeof(struct rt_i2c_bus_device));
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if (bus == RT_NULL)
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{
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rt_kprintf("rt_malloc failed\n");
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return -RT_ENOMEM;
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}
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rt_memset((void *)bus, 0, sizeof(struct rt_i2c_bus_device));
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bus->priv = (void *)&bit_ops;
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at91_i2c_gpio_init();
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rt_i2c_bit_add_bus(bus, "i2c0");
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return 0;
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}
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INIT_DEVICE_EXPORT(at91_i2c_init);
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