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comparison 1wire-delay.h @ 19:8dc98a293e43

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Scrap our handle rolled loops and use AVR libc's macros instead.
author darius
date Mon, 12 Dec 2005 15:42:03 +1030
parents eb1faf51968e
children
comparison
equal deleted inserted replaced
18:108a703c39e6 19:8dc98a293e43
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE. 29 * SUCH DAMAGE.
30 */ 30 */
31 31
32 /* 32 #define DELAY_A _delay_us(6) /* 6 usec */
33 * Note that all these routines are clock speed sensitive! 33 #define DELAY_B _delay_us(30); _delay_us(30); _delay_us(4) /* 64 usec */
34 * (4Mhz AT908515) 34 #define DELAY_C _delay_us(30); _delay_us(30) /* 60 usec */
35 */ 35 #define DELAY_D _delay_us(10) /* 10 usec */
36 36 #define DELAY_E _delay_us(9) /* 9 usec */
37 #if (XTAL_CPU == 4000000) 37 #define DELAY_F _delay_us(25); _delay_us(30); /* 55 usec */
38 /* 6 usec */ 38 #define DELAY_G /* 0 usec */
39 #define DELAY_A asm volatile( \ 39 #define DELAY_H _delay_us(30); _delay_us(30); _delay_us(30); _delay_us(30); \
40 "ldi r21, 6\n\t" \ 40 _delay_us(30); _delay_us(30); _delay_us(30); _delay_us(30); \
41 "L_%=: nop\n\t" \ 41 _delay_us(30); _delay_us(30); _delay_us(30); _delay_us(30); \
42 "dec r21\n\t" \ 42 _delay_us(30); _delay_us(30); _delay_us(30); _delay_us(30) /* 480 usec */
43 "brne L_%=\n\t" \ 43 #define DELAY_I _delay_us(30); _delay_us(30);_delay_us(10) /* 70 usec */
44 ::: "r21")
45
46 /* 64 usec */
47 #define DELAY_B asm volatile( \
48 "ldi r21, 32\n\t" \
49 "L_%=: nop\n\t" \
50 "nop\n\t" \
51 "nop\n\t" \
52 "nop\n\t" \
53 "nop\n\t" \
54 "dec r21\n\t" \
55 "brne L_%=\n\t" \
56 ::: "r21")
57
58 /* 60 usec */
59 #define DELAY_C asm volatile( \
60 "ldi r21, 30\n\t" \
61 "L_%=: nop\n\t" \
62 "nop\n\t" \
63 "nop\n\t" \
64 "nop\n\t" \
65 "nop\n\t" \
66 "dec r21\n\t" \
67 "brne L_%=\n\t" \
68 ::: "r21")
69
70 /* 10 usec */
71 #define DELAY_D asm volatile( \
72 "ldi r21, 9\n\t" \
73 "L_%=: nop\n\t" \
74 "dec r21\n\t" \
75 "brne L_%=\n\t" \
76 ::: "r21")
77
78 /* 9 usec */
79 #define DELAY_E asm volatile( \
80 "ldi r21, 8\n\t" \
81 "L_%=: nop\n\t" \
82 "dec r21\n\t" \
83 "brne L_%=\n\t" \
84 ::: "r21")
85
86 /* 55 usec */
87 #define DELAY_F asm volatile( \
88 "ldi r21, 27\n\t" \
89 "L_%=: nop\n\t" \
90 "nop\n\t" \
91 "nop\n\t" \
92 "nop\n\t" \
93 "nop\n\t" \
94 "nop\n\t" \
95 "nop\n\t" \
96 "nop\n\t" \
97 "nop\n\t" \
98 "nop\n\t" \
99 "nop\n\t" \
100 "nop\n\t" \
101 "nop\n\t" \
102 "dec r21\n\t" \
103 "brne L_%=\n\t" \
104 ::: "r21")
105
106 /* 0 usec */
107 #define DELAY_G
108
109 /* 480 usec */
110 #define DELAY_H asm volatile( \
111 "ldi r21, 120\n\t" \
112 "L_%=: nop\n\t" \
113 "nop\n\t" \
114 "nop\n\t" \
115 "nop\n\t" \
116 "nop\n\t" \
117 "nop\n\t" \
118 "nop\n\t" \
119 "nop\n\t" \
120 "nop\n\t" \
121 "nop\n\t" \
122 "nop\n\t" \
123 "nop\n\t" \
124 "nop\n\t" \
125 "dec r21\n\t" \
126 "brne L_%=\n\t" \
127 ::: "r21")
128
129 /* 70 usec */
130 #define DELAY_I asm volatile( \
131 "ldi r21, 35\n\t" \
132 "L_%=: nop\n\t" \
133 "nop\n\t" \
134 "nop\n\t" \
135 "nop\n\t" \
136 "nop\n\t" \
137 "dec r21\n\t" \
138 "brne L_%=\n\t" \
139 ::: "r21")
140 #else
141 #error No 1 wire delay routines for selected clock speed
142 #endif
143