59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
/*
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* Copyright (c) 2006-2018, 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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* 2018-11-21 SummerGift add port file
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*/
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#include <rtthread.h>
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#include "pcf8574.h"
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//#define DRV_DEBUG
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#define LOG_TAG "drv.pcf8574_port"
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#include <drv_log.h>
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#define ETH_RESET_IO 7 //PHY RESET PIN
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#define I2C_BUS_NAME "i2c2"
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#define PCF8574_ADDR 0x20
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/* pcf8574 hardware init */
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pcf8574_device_t pcf8574_hw_init(char * dev_name, int addr)
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{
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static pcf8574_device_t dev;
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if (dev == RT_NULL)
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{
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dev = pcf8574_init(dev_name, addr);
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if (dev == RT_NULL)
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{
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LOG_E("i2c_bus %s for PCF8574 not found!", dev_name);
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return RT_NULL;
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} else {
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return dev;
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}
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} else
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{
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return dev;
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}
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}
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/* phy reset */
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void phy_reset(void)
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{
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pcf8574_device_t dev = pcf8574_hw_init(I2C_BUS_NAME, PCF8574_ADDR);
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if (dev == RT_NULL)
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{
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LOG_E("can't get pcf8574 device");
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return;
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}
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pcf8574_pin_write(dev, ETH_RESET_IO, 1);
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rt_thread_mdelay(100);
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pcf8574_pin_write(dev, ETH_RESET_IO, 0);
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rt_thread_mdelay(100);
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}
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