FreeCalypso > hg > freecalypso-sw

comparison nuc-fw/nucleus/caltimer.h @ 79:947b1f473960

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beginning of nuc-fw
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 11 Aug 2013 07:17:25 +0000
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78:2c266d4339ff 79:947b1f473960
1 /*
2 * Definitions for Calypso general-purpose timer registers
3 * Added to the FreeNucleus Calypso port by Spacefalcon the Outlaw.
4 *
5 * This header is usable from both .c and .S source files.
6 */
7
8 #ifndef _CALYPSO_TIMER_H
9 #define _CALYPSO_TIMER_H
10
11 #define TIMER1_BASE_ADDR 0xFFFE3800
12 #define TIMER2_BASE_ADDR 0xFFFE6800
13
14 #ifdef __ASSEMBLER__
15
16 /*
17 * Assembly source with cpp
18 *
19 * The most convenient way to access registers like these from ARM
20 * assembly is to load the base address of the register block in some
21 * ARM register, using only one ldr rN, =xxx instruction and only one
22 * literal pool entry, and then access various registers in the block
23 * from the same base using the immediate offset addressing mode.
24 *
25 * Here we define the offsets for the usage scenario above.
26 */
27
28 #define CNTL_TIM 0x00
29 #define LOAD_TIM 0x02
30 #define READ_TIM 0x04
31
32 #else
33
34 /*
35 * C source
36 *
37 * For access from C, we define the layout of each timer register block
38 * as a struct, and then define a pleudo-global-var for easy "volatile"
39 * access to each of the 2 timers.
40 */
41
42 struct timer_regs {
43 unsigned char cntl;
44 unsigned char pad;
45 unsigned short load;
46 unsigned short read;
47 };
48
49 #define TIMER1_REGS (*(volatile struct timer_regs *) TIMER1_BASE_ADDR)
50 #define TIMER2_REGS (*(volatile struct timer_regs *) TIMER2_BASE_ADDR)
51
52 #endif
53
54 /* CNTL register bit definitions */
55 #define CNTL_START 0x01
56 #define CNTL_AUTO_RELOAD 0x02
57 #define CNTL_CLOCK_ENABLE 0x20
58
59 #endif /* include guard */