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