148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
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* File :hw_i2c.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2017, 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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* 2018-01-04 Sundm75 the first version
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "ls1c_i2c.h"
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struct ls1c_i2c_bus
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{
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struct rt_i2c_bus_device parent;
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rt_uint32_t u32Module;
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};
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rt_size_t rt_i2c_master_xfer(struct rt_i2c_bus_device *bus,
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struct rt_i2c_msg *msgs,
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rt_uint32_t num)
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{
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struct ls1c_i2c_bus * i2c_bus = (struct ls1c_i2c_bus *)bus;
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ls1c_i2c_info_t i2c_info;
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struct rt_i2c_msg *msg;
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int i;
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rt_int32_t ret = RT_EOK;
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i2c_info.clock = 50000; // 50kb/s
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i2c_info.I2Cx = i2c_bus->u32Module;
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i2c_init(&i2c_info);
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for (i = 0; i < num; i++)
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{
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msg = &msgs[i];
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if (msg->flags == RT_I2C_RD)
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{
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i2c_send_start_and_addr(&i2c_info, msg->addr, LS1C_I2C_DIRECTION_READ);
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i2c_receive_ack(&i2c_info);
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i2c_receive_data(&i2c_info, (rt_uint8_t *)msg->buf, msg->len);
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i2c_send_stop(&i2c_info);
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}
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else if(msg->flags == RT_I2C_WR)
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{
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i2c_send_start_and_addr(&i2c_info, msg->addr, LS1C_I2C_DIRECTION_WRITE);
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i2c_receive_ack(&i2c_info);
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i2c_send_data(&i2c_info, (rt_uint8_t *)msg->buf, msg->len);
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i2c_send_stop(&i2c_info);
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}
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ret++;
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}
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return ret;
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}
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rt_err_t rt_i2c_bus_control(struct rt_i2c_bus_device *bus,
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rt_uint32_t cmd,
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rt_uint32_t arg)
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{
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struct ls1c_i2c_bus * i2c_bus = (struct ls1c_i2c_bus *)bus;
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RT_ASSERT(bus != RT_NULL);
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i2c_bus = (struct ls1c_i2c_bus *)bus->parent.user_data;
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RT_ASSERT(i2c_bus != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CONFIG :
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break;
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}
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return RT_EOK;
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}
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static const struct rt_i2c_bus_device_ops ls1c_i2c_ops =
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{
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rt_i2c_master_xfer,
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RT_NULL,
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rt_i2c_bus_control
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};
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#ifdef RT_USING_I2C0
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static struct ls1c_i2c_bus ls1c_i2c_bus_0 =
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{
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{1},
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LS1C_I2C_0,
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};
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#endif
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#ifdef RT_USING_I2C1
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static struct ls1c_i2c_bus ls1c_i2c_bus_1 =
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{
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{1},
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LS1C_I2C_1,
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};
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#endif
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#ifdef RT_USING_I2C2
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static struct ls1c_i2c_bus ls1c_i2c_bus_2 =
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{
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{1},
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LS1C_I2C_2,
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};
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#endif
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int rt_i2c_init(void)
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{
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struct ls1c_i2c_bus* ls1c_i2c;
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#ifdef RT_USING_I2C0
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ls1c_i2c = &ls1c_i2c_bus_0;
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ls1c_i2c->parent.ops = &ls1c_i2c_ops;
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rt_i2c_bus_device_register(&ls1c_i2c->parent, "i2c0");
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rt_kprintf("i2c0_init!\n");
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#endif
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#ifdef RT_USING_I2C1
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ls1c_i2c = &ls1c_i2c_bus_1;
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ls1c_i2c->parent.ops = &ls1c_i2c_ops;
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rt_i2c_bus_device_register(&ls1c_i2c->parent, "i2c1");
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rt_kprintf("i2c1_init!\n");
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#endif
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#ifdef RT_USING_I2C2
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ls1c_i2c = &ls1c_i2c_bus_2;
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ls1c_i2c->parent.ops = &ls1c_i2c_ops;
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rt_i2c_bus_device_register(&ls1c_i2c->parent, "i2c2");
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rt_kprintf("i2c2_init!\n");
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#endif
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return RT_EOK;
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}
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