RTC device driver

1
RTC device driver

• ??? 693415077 ???
• ???? 691440019 ???

2
Outline

• ??
• Collie ??????
• ??RTC
• ??????????
• RTC?????
• RTC???
• CCR EEPROM???
• X1226?ML-I0101?????
• ??

3
??

• ??Project???????ML-I0101????RTC???,????
  ????,?????ML-I0101???????,?????????RTC???(??????),
  ????ML-I0101?????????,???RTC??,??ML-I0101???,?????
  ?????????????X1226?????,512 bytes
  EEPROM,????????,?????????

4
MicroLinks Collie Platform??

• ????
• Collie ????????????
• SDRAM ?????????
• FlashROM (NOR Flash) ??????????????
• Boot ROM ??????,?????????Flash ROM ??

5
???
8. Audio input/output 9. 10BaseT Ethernet
10. Touch panel 11. USB host 12. VGA 13.
UART
1. Collie chip 2. 32MB SDRAM 3. 8MB Flash
Rom 4. 512 KB Boot Rom 5. STN/TFT-LCD
interface 6. IDE interface 7. PCMCIA interface
6

• uClinux
• uClinux???????????????(MMU)?OS?
• uClinux?????,Dragon Ball?MC68328?ARM7TDMI??
• Collie I0101????uClinux??Embedded Linux system?

7
??RTC (1/2)

• RTC Real Time Clock ( Calendar )
• ??????,??????,??????????,RTC????????????
• ???????Chip,X1226,????
• ???????????,???????????????????????
• ??alarms,?????????????????
• ?????,????????,??????????

8
??RTC (2/2)

• ??512 Bytes ? EEPROM ???
• ??i2c???????????????????
• ????CMOS,?????????0.6uA,?????????1uA,

9
RTC?????

• X1226 ???i2c?????
• i2c ??????
• Serial Clock(SCL) ????
• Serial Data(SDA) ??????,?????????

10
RTC??? (1/2)
1.   

• RTC ???-Clock/Control Register(CCR)

11
RTC??? (2/2)

• Alarm ??????CCR?

12
CCR EEPROM???

• EEPROM
• EEPROM?X1226??512 Bytes
• ???0x0?0x1ff
• ???CCR(Clock/Control Register)?????????,???EEPROM?
  ???10101110?Slave Address (RTC?),?????EEPROM
• ????CCR????11011110?Slave Address (RTC?) ,?????RTC

13
X1226?ML-I0101?????

• ??GPIO??i2c???,??SCL?SDA??GPIO?

14
???MLI-0101
15
??

• ??RTC?????(Driver)??????,??????????(Application)??
  ??RTC?????????????????????????,???????????
• RTC????????
• ??ioctl()??????RTC???,????RTC?????,??????????
• ??insmod driver???,???????????
• EEPROM???
• ??????EERPOM?

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• END