70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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* File : drv_pcf8574.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006-2013, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2018-06-12 zylx the first version.
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*/
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#include "drv_pcf8574.h"
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#define PCF8574_I2CBUS_NAME "i2c1"
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static struct rt_i2c_bus_device *pcf8574_i2c_bus;
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int pcf8574_Init(void)
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{
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rt_uint8_t value = 0x01;
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pcf8574_i2c_bus = rt_i2c_bus_device_find(PCF8574_I2CBUS_NAME);
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if (pcf8574_i2c_bus == RT_NULL)
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{
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rt_kprintf("can't find i2c device\r\n");
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return -RT_ERROR;
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}
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if (!rt_i2c_master_send(pcf8574_i2c_bus, PCF8574_ADDR, 0, &value, 1))
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{
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rt_kprintf("can't find pcf8574\r\n");
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return -RT_ERROR;
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}
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return 0;
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}
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INIT_COMPONENT_EXPORT(pcf8574_Init);
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rt_uint8_t pcf8574_read_byte(void)
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{
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rt_uint8_t temp = 0;
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rt_i2c_master_recv(pcf8574_i2c_bus, PCF8574_ADDR, 0, &temp, 1);
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return temp;
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}
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void pcf8574_write_byte(rt_uint8_t data)
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{
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rt_i2c_master_send(pcf8574_i2c_bus, PCF8574_ADDR, 0, &data, 1);
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}
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void pcf8574_write_bit(rt_uint8_t bit, rt_uint8_t sta)
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{
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rt_uint8_t data;
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data = pcf8574_read_byte();
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if (sta == 0)data &= ~(1 << bit);
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else data |= 1 << bit;
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pcf8574_write_byte(data);
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}
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rt_uint8_t pcf8574_read_bit(rt_uint8_t bit)
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{
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rt_uint8_t data;
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data = pcf8574_read_byte();
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if (data & (1 << bit))return 1;
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else return 0;
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}
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