97 lines
1.8 KiB
C
97 lines
1.8 KiB
C
/*
|
|
* Copyright (c) 2006-2018, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2017-06-09 tanek first implementation.
|
|
*/
|
|
#include "drv_pcf8574.h"
|
|
#include <board.h>
|
|
#include <rthw.h>
|
|
#include <finsh.h>
|
|
|
|
//#define DEBUG
|
|
|
|
#ifdef DEBUG
|
|
#define DEBUG_PRINTF(...) rt_kprintf(__VA_ARGS__)
|
|
#else
|
|
#define DEBUG_PRINTF(...)
|
|
#endif
|
|
|
|
#define I2C_BUS_NAME "i2c0"
|
|
#define PCF8574_ADDR 0x20
|
|
|
|
static uint8_t rt_pcf8574_read_onebyte(void);
|
|
static void rt_pcf8574_write_onebyte(rt_uint8_t value);
|
|
|
|
static struct rt_i2c_bus_device * i2c_bus;
|
|
|
|
rt_err_t rt_pcf8574_init(void)
|
|
{
|
|
rt_uint8_t buffer[] = { 0xFF };
|
|
rt_off_t pos = PCF8574_ADDR;
|
|
|
|
__HAL_RCC_GPIOB_CLK_ENABLE();
|
|
|
|
i2c_bus = (struct rt_i2c_bus_device *)rt_device_find(I2C_BUS_NAME);
|
|
if (i2c_bus == RT_NULL)
|
|
{
|
|
DEBUG_PRINTF("\ni2c_bus %s for PCF8574 not found!\n", I2C_BUS_NAME);
|
|
return -RT_ENOSYS;
|
|
}
|
|
|
|
if (rt_device_open(&i2c_bus->parent, RT_NULL) != RT_EOK)
|
|
{
|
|
DEBUG_PRINTF("\ni2c_bus %s for cs43l22 opened failed!\n", I2C_BUS_NAME);
|
|
return -RT_EEMPTY;
|
|
}
|
|
|
|
rt_device_write(&i2c_bus->parent, pos, &buffer, 1);
|
|
|
|
return RT_EOK;
|
|
}
|
|
|
|
static uint8_t rt_pcf8574_read_onebyte(void)
|
|
{
|
|
rt_uint8_t value;
|
|
|
|
rt_device_read(&i2c_bus->parent, PCF8574_ADDR, &value, 1);
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
static void rt_pcf8574_write_onebyte(rt_uint8_t value)
|
|
{
|
|
rt_device_write(&i2c_bus->parent, PCF8574_ADDR, &value, 1);
|
|
}
|
|
|
|
|
|
void rt_pcf8574_write_bit(rt_uint8_t bit, rt_uint8_t state)
|
|
{
|
|
rt_uint8_t data;
|
|
data = rt_pcf8574_read_onebyte();
|
|
|
|
if (state == 0)
|
|
data &= ~(1 << bit);
|
|
else
|
|
data |= 1 << bit;
|
|
|
|
rt_pcf8574_write_onebyte(data);
|
|
}
|
|
|
|
|
|
rt_uint8_t rt_pcf8574_read_bit(rt_uint8_t bit)
|
|
{
|
|
rt_uint8_t data;
|
|
data = rt_pcf8574_read_onebyte();
|
|
|
|
if (data&(1 << bit))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|