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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-07-29 zdzn first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <sys/time.h>
#include "drv_rtc.h"
#ifdef BSP_USING_RTC
static struct rt_rtc_device rtc_device;
rt_uint8_t buf[]=
{
0x00, 0x00, 0x43, 0x15, 0x05, 0x01, 0x03, 0x19
};
static time_t raspi_get_timestamp(void)
{
struct tm tm_new = {0};
buf[0] = 0;
bcm283x_i2c_write_read_rs((char*)buf, 1, (char*)buf, 7);
tm_new.tm_year = ((buf[6] / 16) + 0x30) * 10 + (buf[6] % 16) + 0x30;
tm_new.tm_mon = ((buf[5] & 0x1F) / 16 + 0x30) + (buf[5] & 0x1F) % 16+ 0x30;
tm_new.tm_mday = ((buf[4] & 0x3F) / 16 + 0x30) + (buf[4] & 0x3F) % 16+ 0x30;
tm_new.tm_hour = ((buf[2] & 0x3F) / 16 + 0x30) + (buf[2] & 0x3F) % 16+ 0x30;
tm_new.tm_min = ((buf[1] & 0x7F) / 16 + 0x30) + (buf[1] & 0x7F) % 16+ 0x30;
tm_new.tm_sec = ((buf[0] & 0x7F) / 16 + 0x30) + (buf[0] & 0x7F) % 16+ 0x30;
return timegm(&tm_new);
}
static int raspi_set_timestamp(time_t timestamp)
{
struct tm tblock;
gmtime_r(×tamp, &tblock);
buf[0] = 0;
buf[1] = tblock.tm_sec;
buf[2] = tblock.tm_min;
buf[3] = tblock.tm_hour;
buf[4] = tblock.tm_wday;
buf[5] = tblock.tm_mday;
buf[6] = tblock.tm_mon;
buf[7] = tblock.tm_year;
bcm283x_i2c_write((PER_BASE + BCM283X_BSC0_BASE) ,buf, 8);
return RT_EOK;
}
static rt_err_t raspi_rtc_init(rt_device_t dev)
{
bcm283x_i2c_setSlaveAddress(0, 0x68);
bcm283x_i2c_set_baudrate(0, 10000);
raspi_set_timestamp(0);
return RT_EOK;
}
static rt_err_t raspi_rtc_open(rt_device_t dev, rt_uint16_t oflag)
{
bcm283x_i2c_begin(0);
return RT_EOK;
}
static rt_err_t raspi_rtc_close(rt_device_t dev)
{
bcm283x_i2c_end(0);
return RT_EOK;
}
static rt_err_t raspi_rtc_control(rt_device_t dev, int cmd, void *args)
{
RT_ASSERT(dev != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_RTC_GET_TIME:
*(time_t *)args = raspi_get_timestamp();
break;
case RT_DEVICE_CTRL_RTC_SET_TIME:
raspi_set_timestamp(*(time_t *)args);
break;
default:
return -RT_EINVAL;
}
return RT_EOK;
}
static rt_ssize_t raspi_rtc_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
raspi_rtc_control(dev, RT_DEVICE_CTRL_RTC_GET_TIME, buffer);
return size;
}
static rt_ssize_t raspi_rtc_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{
raspi_rtc_control(dev, RT_DEVICE_CTRL_RTC_SET_TIME, (void *)buffer);
return size;
}
#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops raspi_rtc_ops =
{
.init = raspi_rtc_init,
.open = raspi_rtc_open,
.close = raspi_rtc_close,
.read = raspi_rtc_read,
.write = raspi_rtc_write,
.control = raspi_rtc_control
};
#endif
int rt_hw_rtc_init(void)
{
rt_memset(&rtc_device, 0, sizeof(rtc_device));
rtc_device.device.type = RT_Device_Class_RTC;
rtc_device.device.rx_indicate = RT_NULL;
rtc_device.device.tx_complete = RT_NULL;
rtc_device.device.ops = &raspi_rtc_ops;
rtc_device.device.user_data = RT_NULL;
/* register a rtc device */
rt_device_register(&rtc_device.device, "rtc", RT_DEVICE_FLAG_RDWR);
return 0;
}
INIT_DEVICE_EXPORT(rt_hw_rtc_init);
#endif /* BSP_USING_RTC */
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