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/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-02-26 Jackistang first version
*
*/
#include "drv_i2c.h"
#include "i2c.h"
#include <rtdevice.h>
#include <rtthread.h>
#include "board.h"
#ifdef RT_USING_I2C
#if !defined(BSP_USING_I2C0) && !defined(BSP_USING_I2C1)
#error "Please define at least one BSP_USING_I2Cx"
/* this driver can be disabled at menuconfig -> Hardware Drivers Config -> On-chip Peripheral Drivers -> Enable I2C */
#endif
#define DBG_LEVEL DBG_LOG
#include <rtdbg.h>
#define LOG_TAG "drv.i2c"
/* mxc config class */
struct mxc_i2c_config
{
const char *name;
mxc_i2c_regs_t *i2c_periph;
i2c_speed_t speed;
IRQn_Type irq_type;
};
struct mxc_i2c
{
struct rt_i2c_bus_device bus;
struct mxc_i2c_config *config;
};
static struct mxc_i2c_config i2c_config[] =
{
#ifdef BSP_USING_I2C0
{
.name = "i2c0",
.i2c_periph = MXC_I2C_GET_I2C(0),
.irq_type = MXC_I2C_GET_IRQ(0),
.speed = I2C_STD_MODE,
/*I2C_STD_MODE: 100KHz, I2C_FAST_MODE: 400KHz, I2C_FASTPLUS_MODE: 1MHz, I2C_HS_MODE: 3.4MHz */
},
#endif
#ifdef BSP_USING_I2C1
{
.name = "i2c1",
.i2c_periph = MXC_I2C_GET_I2C(1),
.irq_type = MXC_I2C_GET_IRQ(1),
.speed = I2C_STD_MODE,
/*I2C_STD_MODE: 100KHz, I2C_FAST_MODE: 400KHz, I2C_FASTPLUS_MODE: 1MHz, I2C_HS_MODE: 3.4MHz */
},
#endif
};
static struct mxc_i2c i2c_obj[sizeof(i2c_config) / sizeof(i2c_config[0])] = {0};
static rt_ssize_t mxc_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
rt_uint32_t i, ret;
rt_uint16_t addr;
int error;
int restart = 0;
struct rt_i2c_msg *msg;
struct mxc_i2c *obj = (struct mxc_i2c *)bus;
for (i = 0; i < num; i++)
{
msg = &msgs[i];
if (msg->flags & RT_I2C_ADDR_10BIT || msg->flags & RT_I2C_NO_START || msg->flags & RT_I2C_IGNORE_NACK || msg->flags & RT_I2C_NO_READ_ACK)
{
LOG_E("Not support RT_I2C_ADDR_10BIT or RT_I2C_NO_START or RT_I2C_IGNORE_NACK or RT_I2C_NO_READ_ACK");
return 0;
}
if (msg->flags & RT_I2C_NO_STOP)
{
restart = 1;
}
if (msg->flags & RT_I2C_RD)
{
addr = msg->addr << 1;
if ((error = I2C_MasterRead(obj->config->i2c_periph, (uint8_t)addr, msg->buf, msg->len, restart)) != msg->len)
{
LOG_E("Error writing %d", error);
return 0;
}
}
else /* RT_I2C_WR */
{
addr = msg->addr << 1;
if ((error = I2C_MasterWrite(obj->config->i2c_periph, (uint8_t)addr, msg->buf, msg->len, restart)) != msg->len)
{
LOG_E("Error writing %d", error);
return 0;
}
}
}
ret = i;
return ret;
}
static const struct rt_i2c_bus_device_ops mxc_i2c_ops =
{
mxc_i2c_mst_xfer,
RT_NULL,
RT_NULL,
};
int rt_hw_i2c_init(void)
{
rt_size_t obj_num;
int index;
rt_err_t result = 0;
#ifdef BSP_USING_I2C0
NVIC_EnableIRQ(I2C0_IRQn);
#endif
#ifdef BSP_USING_I2C1
NVIC_EnableIRQ(I2C1_IRQn);
#endif
obj_num = sizeof(i2c_obj) / sizeof(struct mxc_i2c);
for (index = 0; index < obj_num; index++)
{
/* init i2c object */
i2c_obj[index].config = &i2c_config[index];
i2c_obj[index].bus.ops = &mxc_i2c_ops;
/* init i2c device */
I2C_Shutdown(i2c_config[index].i2c_periph);
I2C_Init(i2c_config[index].i2c_periph, i2c_config[index].speed, RT_NULL);
/* register i2c device */
result = rt_i2c_bus_device_register(&i2c_obj[index].bus,
i2c_obj[index].config->name
);
RT_ASSERT(result == RT_EOK);
}
return 0;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
#ifdef BSP_USING_I2C0
void I2C0_IRQHandler(void)
{
rt_interrupt_enter();
I2C_Handler(MXC_I2C0);
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_I2C1
void I2C1_IRQHandler(void)
{
rt_interrupt_enter();
I2C_Handler(MXC_I2C1);
rt_interrupt_leave();
}
#endif
#endif /* RT_USING_I2C */
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