123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* Copyright (c)
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Email Notes
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* 2022-04-11 Kevin.Liu kevin.liu.mchp@gmail.com First Release
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include <atmel_start.h>
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#ifdef SAM_I2C_EXAMPLE
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struct sam_i2c_bus
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{
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struct rt_i2c_bus_device parent;
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struct i2c_m_sync_desc *i2c_desc;
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char *device_name;
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};
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#define I2CBUS_NAME "i2c0"
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static struct sam_i2c_bus sam_i2c0 =
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{
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.i2c_desc = &I2C_0,
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.device_name = I2CBUS_NAME,
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};
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static rt_ssize_t sam_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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static rt_ssize_t sam_i2c_slave_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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static rt_err_t sam_i2c_bus_control(struct rt_i2c_bus_device *bus,
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rt_uint32_t, rt_uint32_t);
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static const struct rt_i2c_bus_device_ops sam_i2c_ops =
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{
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.master_xfer = sam_i2c_master_xfer,
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.slave_xfer = sam_i2c_slave_xfer,
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.i2c_bus_control = sam_i2c_bus_control,
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};
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static inline void sam_i2c_update_control(struct rt_i2c_msg *src,
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struct _i2c_m_msg *dest)
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{
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dest->len = (int32_t)src->len;
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dest->addr = src->addr;
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dest->buffer = src->buf;
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/* Get I2C message R/W attribute first */
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dest->flags = dest->flags & 0x0001;
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if (dest->flags & RT_I2C_ADDR_10BIT)
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dest->flags |= I2C_M_TEN;
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else
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dest->flags |= I2C_M_SEVEN;
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}
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static rt_ssize_t sam_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 sam_i2c_bus *sam_i2c = (struct sam_i2c_bus *)bus;
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struct _i2c_m_msg i2c_msg;
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rt_size_t i;
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RT_ASSERT(bus != RT_NULL);
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for (i = 0; i < num; i++)
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{
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sam_i2c_update_control(&msgs[i], &i2c_msg);
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if (i2c_m_sync_transfer(sam_i2c->i2c_desc, &i2c_msg) != 0)
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break;
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}
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return i;
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}
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static rt_ssize_t sam_i2c_slave_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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return 0;
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}
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static rt_err_t sam_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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return -RT_ERROR;
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struct sam_i2c_bus *sam_i2c = (struct sam_i2c_bus *)bus;
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RT_ASSERT(bus != RT_NULL);
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switch (cmd)
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{
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case RT_I2C_DEV_CTRL_CLK:
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i2c_m_sync_set_baudrate(sam_i2c->i2c_desc, 0, arg);
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break;
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default:
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return -RT_EIO;
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}
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return RT_EOK;
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}
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int rt_hw_i2c_init(void)
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{
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rt_i2c_bus_device_register(&sam_i2c0.parent, sam_i2c0.device_name);
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return 0;
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}
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#ifdef RT_USING_COMPONENTS_INIT
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INIT_BOARD_EXPORT(rt_hw_i2c_init);
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#endif
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#endif
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/*@}*/
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