FreeCalypso > hg > freecalypso-tools
view target-utils/include/timer.h @ 232:353218c38996
fc-loadtool batch mode: added -B option
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 04 Aug 2017 08:06:36 +0000 |
parents | 0f11da299b7d |
children |
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/* * Definitions for Calypso general-purpose timer registers * * This header is usable from both .c and .S source files. */ #ifndef _CALYPSO_TIMER_H #define _CALYPSO_TIMER_H #define TIMER1_BASE_ADDR 0xFFFE3800 #define TIMER2_BASE_ADDR 0xFFFE6800 #ifdef __ASSEMBLER__ /* * Assembly source with cpp * * The most convenient way to access registers like these from ARM * assembly is to load the base address of the register block in some * ARM register, using only one ldr rN, =xxx instruction and only one * literal pool entry, and then access various registers in the block * from the same base using the immediate offset addressing mode. * * Here we define the offsets for the usage scenario above. */ #define CNTL_TIM 0x00 #define LOAD_TIM 0x02 #define READ_TIM 0x04 #else /* * C source * * For access from C, we define the layout of each timer register block * as a struct, and then define a pleudo-global-var for easy "volatile" * access to each of the 2 timers. */ struct timer_regs { unsigned char cntl; unsigned char pad; unsigned short load; unsigned short read; }; #define TIMER1_REGS (*(volatile struct timer_regs *) TIMER1_BASE_ADDR) #define TIMER2_REGS (*(volatile struct timer_regs *) TIMER2_BASE_ADDR) #endif /* CNTL register bit definitions */ #define CNTL_START 0x01 #define CNTL_AUTO_RELOAD 0x02 #define CNTL_CLOCK_ENABLE 0x20 #endif /* include guard */