libs/rt-thread-official
libs
/
rt-thread-official
mirror of https://github.com/RT-Thread/rt-thread.git
4
0
Fork 0
Code Issues Releases Wiki Activity
rt-thread-official/bsp/imxrt1052-evk/drivers/drv_i2c.c

267 lines
7.3 KiB
C
Raw Blame History

/*
* File : drv_i2c.c
* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2017-08-08 Yang the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
#include "fsl_gpio.h"
#include "fsl_lpi2c.h"
//#define DRV_I2C_DEBUG
#ifdef RT_USING_I2C
#ifdef RT_USING_I2C_BITOPS
#define I2CBUS_NAME "i2c0"
struct stm32_i2c_bit_data
{
struct
{
GPIO_Type *base;
uint32_t pin;
} scl, sda;
};
static void gpio_udelay(rt_uint32_t us)
{
volatile rt_int32_t i;
for (; us > 0; us--)
{
i = 1000;
while (i--);
}
}
static void gpio_set_input(GPIO_Type* base, uint32_t pin)
{
if (base->GDIR & (1 << pin)) //output mode
{
base->GDIR &= ~(1 << pin);
gpio_udelay(5);
}
}
static void gpio_set_output(GPIO_Type* base, uint32_t pin)
{
if (!(base->GDIR & (1 << pin))) //input mode
{
base->GDIR |= (1 << pin);
gpio_udelay(5);
}
}
static void gpio_set_sda(void *data, rt_int32_t state)
{
struct stm32_i2c_bit_data *bd = data;
gpio_set_output(bd->sda.base, bd->sda.pin);
GPIO_PinWrite(bd->sda.base, bd->sda.pin, !!state);
}
static void gpio_set_scl(void *data, rt_int32_t state)
{
struct stm32_i2c_bit_data *bd = data;
gpio_set_output(bd->scl.base, bd->scl.pin);
GPIO_PinWrite(bd->scl.base, bd->scl.pin, !!state);
}
static rt_int32_t gpio_get_sda(void *data)
{
struct stm32_i2c_bit_data *bd = data;
gpio_set_input(bd->sda.base, bd->sda.pin);
return GPIO_ReadPinInput(bd->sda.base, bd->sda.pin);
}
static rt_int32_t gpio_get_scl(void *data)
{
struct stm32_i2c_bit_data *bd = data;
gpio_set_input(bd->scl.base, bd->scl.pin);
return GPIO_ReadPinInput(bd->scl.base, bd->scl.pin);
}
#else /* RT_USING_I2C_BITOPS */
// todo : add hardware i2c
#endif /* RT_USING_I2C_BITOPS */
int rt_hw_i2c_init(void)
{
#ifdef RT_USING_I2C_BITOPS
/* register I2C1: SCL/P0_20 SDA/P0_19 */
{
static struct rt_i2c_bus_device i2c_device;
static const struct stm32_i2c_bit_data _i2c_bdata =
{
/* SCL */ {GPIO1, 16},
/* SDA */ {GPIO1, 17},
};
static const struct rt_i2c_bit_ops _i2c_bit_ops =
{
(void*)&_i2c_bdata,
gpio_set_sda,
gpio_set_scl,
gpio_get_sda,
gpio_get_scl,
gpio_udelay,
50,
1000
};
gpio_pin_config_t pin_config = {
kGPIO_DigitalOutput, 0,
};
CLOCK_EnableClock(kCLOCK_Iomuxc);
IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_00_GPIO1_IO16, 1U);
IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_00_GPIO1_IO16,
0xD8B0u); /* Slew Rate Field: Slow Slew Rate
Drive Strength Field: R0/6
Speed Field: medium(100MHz)
Open Drain Enable Field: Open Drain Enabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 22K Ohm Pull Up
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_01_GPIO1_IO17, 1U);
IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_01_GPIO1_IO17,
0xD8B0u); /* Slew Rate Field: Slow Slew Rate
Drive Strength Field: R0/6
Speed Field: medium(100MHz)
Open Drain Enable Field: Open Drain Enabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 22K Ohm Pull Up
Hyst. Enable Field: Hysteresis Disabled */
/* Enable touch panel controller */
GPIO_PinInit(_i2c_bdata.sda.base, _i2c_bdata.sda.pin, &pin_config);
GPIO_PinInit(_i2c_bdata.scl.base, _i2c_bdata.scl.pin, &pin_config);
GPIO_PortSet(_i2c_bdata.sda.base, _i2c_bdata.sda.pin);
GPIO_PortSet(_i2c_bdata.scl.base, _i2c_bdata.scl.pin);
//RT_ASSERT(gpio_get_scl(&_i2c_bdata) != 0);
//RT_ASSERT(gpio_get_sda(&_i2c_bdata) != 0);
i2c_device.priv = (void *)&_i2c_bit_ops;
rt_i2c_bit_add_bus(&i2c_device, I2CBUS_NAME);
} /* register I2C */
#else /* RT_USING_I2C_BITOPS */
// Todo : add hardware i2c
#endif /* RT_USING_I2C_BITOPS */
return 0;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
#if defined(RT_USING_FINSH) && defined(DRV_I2C_DEBUG)
#include <finsh.h>
static rt_device_t _i2c_find(const char *name)
{
rt_device_t dev;
dev = rt_device_find(name);
if (!dev)
{
rt_kprintf("search device failed: %s\n", name);
return RT_NULL;
}
if (rt_device_open(dev, RT_DEVICE_OFLAG_RDWR) != RT_EOK)
{
rt_kprintf("open device failed: %s\n", name);
return RT_NULL;
}
rt_kprintf("open i2c bus: %s\n", name);
return dev;
}
static void _search_i2c_device(rt_device_t dev, uint8_t cmd)
{
int count = 0;
struct rt_i2c_msg msgs[2];
uint8_t buf = 0;
msgs[0].flags = RT_I2C_WR;
msgs[0].buf = &cmd;
msgs[0].len = sizeof(cmd);
msgs[1].flags = RT_I2C_RD;
msgs[1].buf = &buf;
msgs[1].len = 1;
for (int i = 0; i <= 0x7f; i++)
{
int len;
msgs[0].addr = i;
msgs[1].addr = i;
len = rt_i2c_transfer(dev, msgs, 2);
if (len == 2)
{
count++;
rt_kprintf("add:%02X transfer success, id: %02X\n", i, buf);
}
}
rt_kprintf("i2c device: %d\n", count);
}
static int i2c_test(const char *name, uint8_t cmd)
{
rt_device_t dev = _i2c_find(name);
if (dev == RT_NULL)
{
rt_kprintf("search i2c device faild\n");
return -1;
}
_search_i2c_device(dev, cmd);
rt_device_close(dev);
return 0;
}
FINSH_FUNCTION_EXPORT(i2c_test, e.g: i2c_test("i2c0", 0xA3));
#endif
#endif /* RT_USING_I2C */
View Git Blame Copy Permalink