138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
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* Copyright (c) 2006-2021, 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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* 2019-07-29 zdzn first version
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include <sys/time.h>
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#include "drv_rtc.h"
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#ifdef BSP_USING_RTC
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static struct rt_rtc_device rtc_device;
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rt_uint8_t buf[]=
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{
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0x00, 0x00, 0x43, 0x15, 0x05, 0x01, 0x03, 0x19
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};
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static time_t raspi_get_timestamp(void)
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{
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struct tm tm_new = {0};
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buf[0] = 0;
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bcm283x_i2c_write_read_rs((char*)buf, 1, (char*)buf, 7);
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tm_new.tm_year = ((buf[6] / 16) + 0x30) * 10 + (buf[6] % 16) + 0x30;
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tm_new.tm_mon = ((buf[5] & 0x1F) / 16 + 0x30) + (buf[5] & 0x1F) % 16+ 0x30;
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tm_new.tm_mday = ((buf[4] & 0x3F) / 16 + 0x30) + (buf[4] & 0x3F) % 16+ 0x30;
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tm_new.tm_hour = ((buf[2] & 0x3F) / 16 + 0x30) + (buf[2] & 0x3F) % 16+ 0x30;
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tm_new.tm_min = ((buf[1] & 0x7F) / 16 + 0x30) + (buf[1] & 0x7F) % 16+ 0x30;
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tm_new.tm_sec = ((buf[0] & 0x7F) / 16 + 0x30) + (buf[0] & 0x7F) % 16+ 0x30;
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return timegm(&tm_new);
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}
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static int raspi_set_timestamp(time_t timestamp)
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{
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struct tm *tblock;
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tblock = gmtime(×tamp);
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buf[0] = 0;
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buf[1] = tblock->tm_sec;
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buf[2] = tblock->tm_min;
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buf[3] = tblock->tm_hour;
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buf[4] = tblock->tm_wday;
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buf[5] = tblock->tm_mday;
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buf[6] = tblock->tm_mon;
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buf[7] = tblock->tm_year;
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bcm283x_i2c_write((PER_BASE + BCM283X_BSC0_BASE) ,buf, 8);
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return RT_EOK;
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}
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static rt_err_t raspi_rtc_init(rt_device_t dev)
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{
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bcm283x_i2c_setSlaveAddress(0, 0x68);
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bcm283x_i2c_set_baudrate(0, 10000);
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raspi_set_timestamp(0);
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return RT_EOK;
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}
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static rt_err_t raspi_rtc_open(rt_device_t dev, rt_uint16_t oflag)
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{
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bcm283x_i2c_begin(0);
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return RT_EOK;
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}
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static rt_err_t raspi_rtc_close(rt_device_t dev)
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{
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bcm283x_i2c_end(0);
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return RT_EOK;
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}
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static rt_err_t raspi_rtc_control(rt_device_t dev, int cmd, void *args)
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{
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RT_ASSERT(dev != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_RTC_GET_TIME:
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*(rt_uint32_t *)args = raspi_get_timestamp();
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break;
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case RT_DEVICE_CTRL_RTC_SET_TIME:
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raspi_set_timestamp(*(time_t *)args);
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break;
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default:
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return RT_EINVAL;
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}
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return RT_EOK;
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}
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static rt_size_t raspi_rtc_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
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{
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raspi_rtc_control(dev, RT_DEVICE_CTRL_RTC_GET_TIME, buffer);
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return size;
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}
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static rt_size_t raspi_rtc_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
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{
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raspi_rtc_control(dev, RT_DEVICE_CTRL_RTC_SET_TIME, (void *)buffer);
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return size;
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}
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#ifdef RT_USING_DEVICE_OPS
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const static struct rt_device_ops raspi_rtc_ops =
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{
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.init = raspi_rtc_init,
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.open = raspi_rtc_open,
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.close = raspi_rtc_close,
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.read = raspi_rtc_read,
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.write = raspi_rtc_write,
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.control = raspi_rtc_control
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};
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#endif
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int rt_hw_rtc_init(void)
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{
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rt_memset(&rtc_device, 0, sizeof(rtc_device));
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rtc_device.device.type = RT_Device_Class_RTC;
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rtc_device.device.rx_indicate = RT_NULL;
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rtc_device.device.tx_complete = RT_NULL;
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rtc_device.device.ops = &raspi_rtc_ops;
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rtc_device.device.user_data = RT_NULL;
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/* register a rtc device */
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rt_device_register(&rtc_device.device, "rtc", RT_DEVICE_FLAG_RDWR);
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return 0;
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}
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INIT_DEVICE_EXPORT(rt_hw_rtc_init);
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#endif /* BSP_USING_RTC */
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