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I have a Real Time Clock (RTC) located at address 0x180000 I would like to create a struct of the RTC registers and map it to 0x180000 where the RTC registers start, located in far xdata memory or (HDATA). I want to access the RTC such as
RTC.Month = 8;
This is what I came up with that works, it is accessing the RTC at 0x180000.
#define RTC_ADDRESS (0x180000ul) typedef struct RTC_REGS { unsigned char hsec; unsigned char sec; unsigned char min; unsigned char min_alarm; unsigned char hour; unsigned char hour_alarm; unsigned char day; unsigned char day_alarm; unsigned char date; unsigned char month; unsigned char year; unsigned char cmd; unsigned char wd_hsec; unsigned char wd_sec; unsigned char dummy1; unsigned char dummy2; unsigned char user[48]; } RTC_regs; RTC_regs far *RTC_registers = &FVAR(RTC_regs, RTC_ADDRESS); void RTC_Init( void ) { RTC_registers->hsec = 0; RTC_registers->sec = 0; RTC_registers->min = 0; }