136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*
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* File : i2c_core.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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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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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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static struct rt_mutex i2c_core_lock;
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rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus,
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const char *bus_name)
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{
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rt_err_t res = RT_EOK;
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rt_mutex_init(&bus->lock, "i2c_bus_lock", RT_IPC_FLAG_FIFO);
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rt_mutex_take(&i2c_core_lock, RT_WAITING_FOREVER);
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if (bus->timeout == 0)
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bus->timeout = RT_TICK_PER_SECOND;
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res = rt_i2c_bus_device_device_init(bus, bus_name);
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i2c_dbg("I2C bus [%s] registered\n", bus_name);
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rt_mutex_release(&i2c_core_lock);
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return res;
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}
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struct rt_i2c_bus_device* rt_i2c_bus_device_find(const char *bus_name)
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{
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struct rt_i2c_bus_device *bus;
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rt_device_t dev = rt_device_find(bus_name);
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if (dev == RT_NULL || dev->type != RT_Device_Class_I2CBUS)
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{
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i2c_dbg("I2C bus %s not exist\n", bus_name);
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return RT_NULL;
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}
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bus = (struct rt_i2c_bus_device *)dev->user_data;
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return bus;
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}
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rt_size_t rt_i2c_transfer(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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rt_size_t ret;
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if (bus->ops->master_xfer)
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{
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#ifdef RT_I2C_DEBUG
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for (ret = 0; ret < num; ret++)
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{
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i2c_dbg("msgs[%d] %c, addr=0x%02x, len=%d%s\n", ret,
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(msgs[ret].flags & RT_I2C_RD) ? 'R' : 'W',
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msgs[ret].addr, msgs[ret].len);
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}
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#endif
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rt_mutex_take(&bus->lock, RT_WAITING_FOREVER);
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ret = bus->ops->master_xfer(bus, msgs, num);
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rt_mutex_release(&bus->lock);
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return ret;
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}
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else
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{
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i2c_dbg("I2C bus operation not supported\n");
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return 0;
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}
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}
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rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
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rt_uint16_t addr,
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rt_uint16_t flags,
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const rt_uint8_t *buf,
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rt_uint32_t count)
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{
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rt_size_t ret;
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struct rt_i2c_msg msg;
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msg.addr = addr;
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msg.flags = flags & RT_I2C_ADDR_10BIT;
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msg.len = count;
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msg.buf = (rt_uint8_t *)buf;
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ret = rt_i2c_transfer(bus, &msg, 1);
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return (ret > 0) ? count : ret;
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}
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rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
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rt_uint16_t addr,
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rt_uint16_t flags,
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rt_uint8_t *buf,
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rt_uint32_t count)
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{
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rt_size_t ret;
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struct rt_i2c_msg msg;
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RT_ASSERT(bus != RT_NULL);
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msg.addr = addr;
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msg.flags = flags & RT_I2C_ADDR_10BIT;
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msg.flags |= RT_I2C_RD;
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msg.len = count;
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msg.buf = buf;
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ret = rt_i2c_transfer(bus, &msg, 1);
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return (ret > 0) ? count : ret;
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}
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rt_err_t rt_i2c_core_init(void)
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{
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return rt_mutex_init (&i2c_core_lock, "i2c_core_lock", RT_IPC_FLAG_FIFO);
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}
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