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rt-thread-official/bsp/k210/drivers/drv_i2c.c

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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-08-21 heyuanjie87 first version
* 2023-03-31 Vandoul formatting code.
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
#include "i2c.h"
#include "gpiohs.h"
#include "utils.h"
#include "sleep.h"
#include "fpioa.h"
#ifdef RT_USING_I2C
#ifndef BSP_I2C0_SCL_PIN
#define BSP_I2C0_SCL_PIN 0
#endif
#ifndef BSP_I2C0_SDA_PIN
#define BSP_I2C0_SDA_PIN 1
#endif
#ifndef BSP_I2C1_SCL_PIN
#define BSP_I2C1_SCL_PIN 30
#endif
#ifndef BSP_I2C1_SDA_PIN
#define BSP_I2C1_SDA_PIN 31
#endif
#ifndef BSP_I2C2_SCL_PIN
#define BSP_I2C2_SCL_PIN 4
#endif
#ifndef BSP_I2C2_SDA_PIN
#define BSP_I2C2_SDA_PIN 5
#endif
static rt_err_t ki2c_send(
volatile i2c_t *i2c_adapter,
rt_uint8_t *send_buf,
rt_uint32_t send_buf_len)
{
rt_uint32_t fifo_len, index;
while (send_buf_len)
{
fifo_len = 8 - i2c_adapter->txflr;
fifo_len = send_buf_len < fifo_len ? send_buf_len : fifo_len;
for (index = 0; index < fifo_len; index++)
i2c_adapter->data_cmd = I2C_DATA_CMD_DATA(*send_buf++);
if (i2c_adapter->tx_abrt_source != 0)
{
while (i2c_adapter->status & I2C_STATUS_ACTIVITY); //
i2c_adapter->clr_intr = i2c_adapter->clr_intr; //
return -RT_ERROR;
}
send_buf_len -= fifo_len;
}
return RT_EOK;
}
static rt_err_t ki2c_recv(
volatile i2c_t *i2c_adapter,
rt_uint8_t *receive_buf,
rt_uint32_t receive_buf_len)
{
rt_uint32_t fifo_len, index;
rt_uint32_t rx_len = receive_buf_len;
while (receive_buf_len || rx_len)
{
fifo_len = i2c_adapter->rxflr;
fifo_len = rx_len < fifo_len ? rx_len : fifo_len;
for (index = 0; index < fifo_len; index++)
*receive_buf++ = (rt_uint8_t)i2c_adapter->data_cmd;
rx_len -= fifo_len;
fifo_len = 8 - i2c_adapter->txflr;
fifo_len = receive_buf_len < fifo_len ? receive_buf_len : fifo_len;
for (index = 0; index < fifo_len; index++)
i2c_adapter->data_cmd = I2C_DATA_CMD_CMD;
if (i2c_adapter->tx_abrt_source != 0)
return -RT_ERROR;
receive_buf_len -= fifo_len;
}
return RT_EOK;
}
static void ki2c_setaddr(
volatile i2c_t *i2c_adapter,
rt_uint16_t addr,
int width)
{
i2c_adapter->tar = I2C_TAR_ADDRESS(addr) & I2C_TAR_ADDRESS_MASK;
if(width == 10)
{
i2c_adapter->tar |= I2C_TAR_10BITADDR_MASTER;
}
else
{
i2c_adapter->tar &= ~I2C_TAR_10BITADDR_MASTER;
}
}
static int ki2c_waittx(volatile i2c_t *i2c_adapter, int timeout_ms)
{
rt_tick_t start;
start = rt_tick_get();
while ((i2c_adapter->status & I2C_STATUS_ACTIVITY) || !(i2c_adapter->status & I2C_STATUS_TFE))
{
if (rt_tick_from_millisecond(rt_tick_get() - start) > timeout_ms)
break;
}
if (i2c_adapter->tx_abrt_source != 0)
return -RT_ERROR;
return RT_EOK;
}
static void ki2c_clearerr(volatile i2c_t *i2c_adapter)
{
i2c_adapter->clr_tx_abrt = i2c_adapter->clr_tx_abrt;
}
static rt_ssize_t _i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
rt_ssize_t i;
i2c_t *kbus = (i2c_t *)bus->priv;
rt_err_t status;
int waittx = 0;
RT_ASSERT(bus != RT_NULL);
if(msgs[0].flags & RT_I2C_ADDR_10BIT)
{
ki2c_setaddr(kbus, msgs[0].addr, 10);
}
else
{
ki2c_setaddr(kbus, msgs[0].addr, 7);
}
ki2c_clearerr(kbus);
for (i = 0; i < num; i++)
{
waittx = 0;
if (msgs[i].flags & RT_I2C_RD)
{
status = ki2c_recv(kbus, msgs[i].buf, msgs[i].len);
}
else
{
status = ki2c_send(kbus, msgs[i].buf, msgs[i].len);
waittx = 1;
}
if (status != RT_EOK)
{
goto _out;
}
}
if (waittx)
{
status = ki2c_waittx(kbus, 2000);
if (status != RT_EOK)
{
goto _out;
}
}
return i;
_out:
return status;
}
static const struct rt_i2c_bus_device_ops i2c_ops =
{
.master_xfer = _i2c_mst_xfer,
.slave_xfer = RT_NULL,
.i2c_bus_control = RT_NULL,
};
#ifdef RT_USING_I2C_BITOPS
typedef struct pin_info_s {
uint32_t scl;
uint32_t sda;
} pin_info_t;
static void set_sda(void *data, rt_int32_t state)
{
pin_info_t *pin = (pin_info_t *)data;
/* state = 1: disable output. state = 0: enable output.*/
set_gpio_bit(gpiohs->output_en.u32, pin->sda, !state);
}
static void set_scl(void *data, rt_int32_t state)
{
pin_info_t *pin = (pin_info_t *)data;
/* state = 1: disable output. state = 0: enable output.*/
set_gpio_bit(gpiohs->output_en.u32, pin->scl, !state);
}
static rt_int32_t get_sda(void *data)
{
pin_info_t *pin = (pin_info_t *)data;
/* disable output.*/
set_gpio_bit(gpiohs->output_en.u32, pin->sda, 0);
return get_gpio_bit(gpiohs->input_val.u32, pin->sda);
}
static rt_int32_t get_scl(void *data)
{
pin_info_t *pin = (pin_info_t *)data;
/* disable output.*/
set_gpio_bit(gpiohs->output_en.u32, pin->scl, 0);
return get_gpio_bit(gpiohs->input_val.u32, pin->scl);
}
static void udelay(rt_uint32_t us)
{
usleep((uint64_t)us);
}
static struct rt_i2c_bit_ops bit_ops_0 =
{
RT_NULL,
set_sda,
set_scl,
get_sda,
get_scl,
udelay,
5,
5
};
static struct rt_i2c_bit_ops bit_ops_1 =
{
RT_NULL,
set_sda,
set_scl,
get_sda,
get_scl,
udelay,
5,
5
};
static struct rt_i2c_bit_ops bit_ops_2 =
{
RT_NULL,
set_sda,
set_scl,
get_sda,
get_scl,
udelay,
5,
5
};
extern int get_pin_channel(rt_base_t pin_index);
#endif
int rt_hw_i2c_init(void)
{
struct rt_i2c_bus_device *busdev;
#ifdef BSP_USING_I2C0
static struct rt_i2c_bus_device i2c_dev0;
busdev = &i2c_dev0;
#ifdef RT_USING_I2C_BITOPS
fpioa_set_function(BSP_I2C0_SCL_PIN, FUNC_RESV0);
fpioa_set_function(BSP_I2C0_SDA_PIN, FUNC_RESV0);
rt_pin_write(BSP_I2C0_SCL_PIN, PIN_LOW);
rt_pin_write(BSP_I2C0_SDA_PIN, PIN_LOW);
rt_pin_mode(BSP_I2C0_SCL_PIN, PIN_MODE_INPUT_PULLUP);
rt_pin_mode(BSP_I2C0_SDA_PIN, PIN_MODE_INPUT_PULLUP);
static pin_info_t pin0;
pin0.scl = get_pin_channel(BSP_I2C0_SCL_PIN);
pin0.sda = get_pin_channel(BSP_I2C0_SDA_PIN);
bit_ops_0.data = (void *)&pin0;
busdev->priv = (void *)&bit_ops_0;
rt_i2c_bit_add_bus(busdev, "i2c0");
#else
busdev->ops = &i2c_ops;
busdev->priv = (void *)I2C0_BASE_ADDR;
i2c_init(I2C_DEVICE_0, 0, 7, 100000);
rt_i2c_bus_device_register(busdev, "i2c0");
#endif
#endif
#ifdef BSP_USING_I2C1
static struct rt_i2c_bus_device i2c_dev1;
busdev = &i2c_dev1;
#ifdef RT_USING_I2C_BITOPS
fpioa_set_function(BSP_I2C1_SCL_PIN, FUNC_RESV0);
fpioa_set_function(BSP_I2C1_SDA_PIN, FUNC_RESV0);
rt_pin_write(BSP_I2C1_SCL_PIN, PIN_LOW);
rt_pin_write(BSP_I2C1_SDA_PIN, PIN_LOW);
rt_pin_mode(BSP_I2C1_SCL_PIN, PIN_MODE_INPUT_PULLUP);
rt_pin_mode(BSP_I2C1_SDA_PIN, PIN_MODE_INPUT_PULLUP);
static pin_info_t pin1;
pin1.scl = get_pin_channel(BSP_I2C1_SCL_PIN);
pin1.sda = get_pin_channel(BSP_I2C1_SDA_PIN);
bit_ops_1.data = (void *)&pin1;
busdev->priv = (void *)&bit_ops_1;
rt_i2c_bit_add_bus(busdev, "i2c1");
#else
busdev->ops = &i2c_ops;
busdev->priv = (void *)I2C1_BASE_ADDR;
i2c_init(I2C_DEVICE_1, 0, 7, 100000);
rt_i2c_bus_device_register(busdev, "i2c1");
#endif
#endif
#ifdef BSP_USING_I2C2
static struct rt_i2c_bus_device i2c_dev2;
busdev = &i2c_dev2;
#ifdef RT_USING_I2C_BITOPS
fpioa_set_function(BSP_I2C2_SCL_PIN, FUNC_RESV0);
fpioa_set_function(BSP_I2C2_SDA_PIN, FUNC_RESV0);
rt_pin_write(BSP_I2C2_SCL_PIN, PIN_LOW);
rt_pin_write(BSP_I2C2_SDA_PIN, PIN_LOW);
rt_pin_mode(BSP_I2C2_SCL_PIN, PIN_MODE_INPUT_PULLUP);
rt_pin_mode(BSP_I2C2_SDA_PIN, PIN_MODE_INPUT_PULLUP);
static pin_info_t pin2;
pin2.scl = get_pin_channel(BSP_I2C2_SCL_PIN);
pin2.sda = get_pin_channel(BSP_I2C2_SDA_PIN);
bit_ops_2.data = (void *)&pin2;
busdev->priv = (void *)&bit_ops_2;
rt_i2c_bit_add_bus(busdev, "i2c2");
#else
busdev->ops = &i2c_ops;
busdev->priv = (void *)I2C2_BASE_ADDR;
i2c_init(I2C_DEVICE_2, 0, 7, 100000);
rt_i2c_bus_device_register(busdev, "i2c2");
#endif
#endif
return 0;
}
INIT_BOARD_EXPORT(rt_hw_i2c_init);
#endif
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