128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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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 Notes
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* 2022-02-22 airm2m first version
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*/
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#include <rtdevice.h>
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#include <rtthread.h>
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#include "board.h"
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#ifdef BSP_USING_I2C
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static struct rt_i2c_bus_device prv_air105_i2c;
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static rt_size_t air105_i2c_mst_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_size_t air105_i2c_slv_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 air105_i2c_bus_control(struct rt_i2c_bus_device *bus,
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rt_uint32_t,
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rt_uint32_t);
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static const struct rt_i2c_bus_device_ops air105_i2c_ops =
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{
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.master_xfer = air105_i2c_mst_xfer,
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.slave_xfer = RT_NULL,
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.i2c_bus_control = air105_i2c_bus_control
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};
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static rt_size_t air105_i2c_mst_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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rt_size_t i;
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uint64_t tick;
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struct rt_i2c_msg *msg = msgs;
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RT_ASSERT(bus != RT_NULL);
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rt_uint32_t i2c_id = (rt_uint32_t)bus->priv;
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rt_int32_t Result;
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while(!I2C_WaitResult(i2c_id, &Result)) {;}
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for (i = 0; i < num; i++)
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{
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if (!(msg[i].flags & RT_I2C_NO_START))
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{
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if (msg[i].flags & RT_I2C_ADDR_10BIT)
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{
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I2C_Prepare(i2c_id, msg[i].addr, 2, NULL, NULL);
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}
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else
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{
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I2C_Prepare(i2c_id, msg[i].addr, 1, NULL, NULL);
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}
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}
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if (msg[i].flags & RT_I2C_RD)
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{
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tick = GetSysTick();
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I2C_MasterXfer(i2c_id, I2C_OP_READ, 0, msg[i].buf, msg[i].len, bus->timeout);
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while(!I2C_WaitResult(i2c_id, &Result) && !SysTickCheckTimeout(tick, bus->timeout * CORE_TICK_1MS)){;}
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if (!I2C_WaitResult(i2c_id, &Result))
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{
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I2C_ForceStop(i2c_id);
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return -RT_EIO;
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}
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}
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else
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{
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tick = GetSysTick();
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I2C_MasterXfer(i2c_id, I2C_OP_WRITE, 0, msg[i].buf, msg[i].len, bus->timeout);
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while(!I2C_WaitResult(i2c_id, &Result) && !SysTickCheckTimeout(tick, bus->timeout * CORE_TICK_1MS)){;}
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if (!I2C_WaitResult(i2c_id, &Result))
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{
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I2C_ForceStop(i2c_id);
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return -RT_EIO;
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}
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}
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}
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return i;
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}
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static rt_size_t air105_i2c_slv_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 RT_ERROR;
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}
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static rt_err_t air105_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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RT_ASSERT(bus != RT_NULL);
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rt_uint32_t i2c_id = (rt_uint32_t)bus->priv;
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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_MasterSetup(i2c_id, 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 air105_hw_i2c_init(void)
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{
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I2C_GlobalInit();
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prv_air105_i2c.ops = &air105_i2c_ops;
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prv_air105_i2c.priv = 0;
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I2C_MasterSetup(0, 400000);
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GPIO_Iomux(GPIOE_06, 2);
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GPIO_Iomux(GPIOE_07, 2);
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#ifdef I2C_BUS_NAME
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rt_i2c_bus_device_register(&prv_air105_i2c, I2C_BUS_NAME);
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#else
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rt_i2c_bus_device_register(&prv_air105_i2c, "i2c");
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#endif
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return 0;
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}
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INIT_DEVICE_EXPORT(air105_hw_i2c_init);
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#endif /* BSP_USING_I2C */
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