/* * Copyright (c) 2006-2019, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2019-07-29 zdzn first version */ #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 mktime(&tm_new); } static int raspi_set_timestamp(time_t timestamp) { struct tm *tblock; tblock = localtime(×tamp); 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: *(rt_uint32_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_size_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_size_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 */