/* * QEMU MC146818 RTC emulation * * Copyright (c) 2003-2004 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "vl.h" //#define DEBUG_CMOS #define RTC_SECONDS 0 #define RTC_SECONDS_ALARM 1 #define RTC_MINUTES 2 #define RTC_MINUTES_ALARM 3 #define RTC_HOURS 4 #define RTC_HOURS_ALARM 5 #define RTC_ALARM_DONT_CARE 0xC0 #define RTC_DAY_OF_WEEK 6 #define RTC_DAY_OF_MONTH 7 #define RTC_MONTH 8 #define RTC_YEAR 9 #define RTC_REG_A 10 #define RTC_REG_B 11 #define RTC_REG_C 12 #define RTC_REG_D 13 #define REG_A_UIP 0x80 #define REG_B_SET 0x80 #define REG_B_PIE 0x40 #define REG_B_AIE 0x20 #define REG_B_UIE 0x10 struct RTCState { uint8_t cmos_data[128]; uint8_t cmos_index; struct tm current_tm; int irq; /* periodic timer */ QEMUTimer *periodic_timer; int64_t next_periodic_time; /* second update */ int64_t next_second_time; QEMUTimer *second_timer; QEMUTimer *second_timer2; }; static void rtc_set_time(RTCState *s); static void rtc_copy_date(RTCState *s); static void rtc_timer_update(RTCState *s, int64_t current_time) { int period_code, period; int64_t cur_clock, next_irq_clock; period_code = s->cmos_data[RTC_REG_A] & 0x0f; if (period_code != 0 && (s->cmos_data[RTC_REG_B] & REG_B_PIE)) { if (period_code <= 2) period_code += 7; /* period in 32 Khz cycles */ period = 1 << (period_code - 1); /* compute 32 khz clock */ cur_clock = muldiv64(current_time, 32768, ticks_per_sec); next_irq_clock = (cur_clock & ~(period - 1)) + period; s->next_periodic_time = muldiv64(next_irq_clock, ticks_per_sec, 32768) + 1; qemu_mod_timer(s->periodic_timer, s->next_periodic_time); } else { qemu_del_timer(s->periodic_timer); } } static void rtc_periodic_timer(void *opaque) { RTCState *s = opaque; rtc_timer_update(s, s->next_periodic_time); s->cmos_data[RTC_REG_C] |= 0xc0; pic_set_irq(s->irq, 1); } static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data) { RTCState *s = opaque; if ((addr & 1) == 0) { s->cmos_index = data & 0x7f; } else { #ifdef DEBUG_CMOS printf("cmos: write index=0x%02x val=0x%02x\n", s->cmos_index, data); #endif switch(s->cmos_index) { case RTC_SECONDS_ALARM: case RTC_MINUTES_ALARM: case RTC_HOURS_ALARM: /* XXX: not supported */ s->cmos_data[s->cmos_index] = data; break; case RTC_SECONDS: case RTC_MINUTES: case RTC_HOURS: case RTC_DAY_OF_WEEK: case RTC_DAY_OF_MONTH: case RTC_MONTH: case RTC_YEAR: s->cmos_data[s->cmos_index] = data; /* if in set mode, do not update the time */ if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) { rtc_set_time(s); } break; case RTC_REG_A: /* UIP bit is read only */ s->cmos_d
# QMK Hardware Drivers

QMK is used on a lot of different hardware. While support for the most common MCU's and matrix configurations is built-in there are a number of drivers that can be added to a keyboard to support additional hardware. Examples include mice and other pointing devices, i/o expanders for split keyboards, bluetooth modules, and LCD, OLED, and TFT screens.

<!-- FIXME: This should talk about how drivers are integrated into QMK and how you can add your own driver.

# Driver System Overview

-->

# Available Drivers

## ProMicro (AVR Only)

Support for addressing pins on the ProMicro by their Arduino name rather than their AVR name. This needs to be better documented, if you are trying to do this and reading the code doesn't help please [open an issue](https://github.com/qmk/qmk_firmware/issues/new) and we can help you through the process.

## SSD1306 OLED Driver

Support for SSD1306 based OLED displays. For more information see the [OLED Driver Feature](feature_oled_driver.md) page.

## uGFX

You can make use of uGFX within QMK to drive character and graphic LCDs, LED arrays, OLED, TFT, and other display technologies. This needs to be better documented, if you are trying to do this and reading the code doesn't help please [open an issue](https://github.com/qmk/qmk_firmware/issues/new) and we can help you through the process.

## WS2812

Support for WS2811/WS2812{a,b,c} LED's. For more information see the [RGB Light](feature_rgblight.md) page.

## IS31FL3731

Support for up to 2 drivers. Each driver impliments 2 charlieplex matrices to individually address LEDs using I2C. This allows up to 144 same color LEDs or 32 RGB LEDs. For more information on how to setup the driver see the [RGB Matrix](feature_rgb_matrix.md) page.

## IS31FL3733

Support for up to a single driver with room for expansion. Each driver can control 192 individual LEDs or 64 RGB LEDs. For more information on how to setup the driver see the [RGB Matrix](feature_rgb_matrix.md) page.

## 24xx series external I2C EEPROM

Support for an external I2C-based EEPROM instead of using the on-chip EEPROM. For more information on how to setup the driver see the [EEPROM Driver](eeprom_driver.md) page.
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-30 11:47:19 +0000
&s->current_tm.tm_wday); qemu_get_be32s(f, &s->current_tm.tm_mday); qemu_get_be32s(f, &s->current_tm.tm_mon); qemu_get_be32s(f, &s->current_tm.tm_year); qemu_get_timer(f, s->periodic_timer); qemu_get_be64s(f, &s->next_periodic_time); qemu_get_be64s(f, &s->next_second_time); qemu_get_timer(f, s->second_timer); qemu_get_timer(f, s->second_timer2); return 0; } RTCState *rtc_init(int base, int irq) { RTCState *s; s = qemu_mallocz(sizeof(RTCState)); if (!s) return NULL; s->irq = irq; s->cmos_data[RTC_REG_A] = 0x26; s->cmos_data[RTC_REG_B] = 0x02; s->cmos_data[RTC_REG_C] = 0x00; s->cmos_data[RTC_REG_D] = 0x80; s->periodic_timer = qemu_new_timer(vm_clock, rtc_periodic_timer, s); s->second_timer = qemu_new_timer(vm_clock, rtc_update_second, s); s->second_timer2 = qemu_new_timer(vm_clock, rtc_update_second2, s); s->next_second_time = qemu_get_clock(vm_clock) + (ticks_per_sec * 99) / 100; qemu_mod_timer(s->second_timer2, s->next_second_time); register_ioport_write(base, 2, 1, cmos_ioport_write, s); register_ioport_read(base, 2, 1, cmos_ioport_read, s); register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s); return s; }