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