Simple LM35 temperature sensor for adafruit neopixel
Fork of PololuLedStrip by
led_strip_write_color.s@5:690fdfb595de, 2013-03-01 (annotated)
- Committer:
- DavidEGrayson
- Date:
- Fri Mar 01 00:05:26 2013 +0000
- Revision:
- 5:690fdfb595de
- Parent:
- 4:d3b60bd43811
- Child:
- 6:9d0530b7dae2
It looks like the code is transmitting the right number of bits now.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
DavidEGrayson | 0:06475317f283 | 1 | AREA asm_func, CODE, READONLY |
DavidEGrayson | 0:06475317f283 | 2 | EXPORT led_strip_write_color |
DavidEGrayson | 0:06475317f283 | 3 | |
DavidEGrayson | 0:06475317f283 | 4 | led_strip_write_color |
DavidEGrayson | 5:690fdfb595de | 5 | ; Register usage: |
DavidEGrayson | 5:690fdfb595de | 6 | ; These are the first 4 arguments to the method: |
DavidEGrayson | 5:690fdfb595de | 7 | ; R0: pointer to the color to send |
DavidEGrayson | 5:690fdfb595de | 8 | ; R1: pointer to the register for setting the pin |
DavidEGrayson | 5:690fdfb595de | 9 | ; R2: pointer to the register for clearing the pin |
DavidEGrayson | 5:690fdfb595de | 10 | ; R3: pin mask |
DavidEGrayson | 5:690fdfb595de | 11 | ; Additionally, we use these registers: |
DavidEGrayson | 5:690fdfb595de | 12 | ; R4: temporary register |
DavidEGrayson | 5:690fdfb595de | 13 | ; R7: the number of bits we still need to send |
DavidEGrayson | 5:690fdfb595de | 14 | ; R12: shift register that holds the 24-bit color |
DavidEGrayson | 5:690fdfb595de | 15 | ; R13: Link Register, holds return addresses. |
DavidEGrayson | 5:690fdfb595de | 16 | |
DavidEGrayson | 5:690fdfb595de | 17 | |
DavidEGrayson | 5:690fdfb595de | 18 | push {r4, r12, r7, lr} |
DavidEGrayson | 0:06475317f283 | 19 | |
DavidEGrayson | 0:06475317f283 | 20 | ldr r12, [r0] ; Read the next color. |
DavidEGrayson | 0:06475317f283 | 21 | rbit r12, r12 ; Reverse the order of the bits. |
DavidEGrayson | 0:06475317f283 | 22 | rev r12, r12 ; Reverse the order of the bytes. |
DavidEGrayson | 0:06475317f283 | 23 | mov r7, #24 ; Initialize the loop counter register. |
DavidEGrayson | 0:06475317f283 | 24 | |
DavidEGrayson | 0:06475317f283 | 25 | send_led_strip_bit |
DavidEGrayson | 0:06475317f283 | 26 | str r3, [r1] ; Drive the line high. |
DavidEGrayson | 0:06475317f283 | 27 | rrxs r12, r12 ; Rotate right through carry. |
DavidEGrayson | 0:06475317f283 | 28 | |
DavidEGrayson | 5:690fdfb595de | 29 | ldr r4, =delay_region_end |
DavidEGrayson | 5:690fdfb595de | 30 | sub r4, r4, #59*2 |
DavidEGrayson | 5:690fdfb595de | 31 | blx r4 |
DavidEGrayson | 0:06475317f283 | 32 | |
DavidEGrayson | 0:06475317f283 | 33 | it cc ; If the bit to send it 0... |
DavidEGrayson | 0:06475317f283 | 34 | strcc r3, [r2] ; Drive the line low. |
DavidEGrayson | 0:06475317f283 | 35 | |
DavidEGrayson | 5:690fdfb595de | 36 | ldr r4, =delay_region_end |
DavidEGrayson | 5:690fdfb595de | 37 | sub r4, r4, #59*2 |
DavidEGrayson | 5:690fdfb595de | 38 | blx r4 |
DavidEGrayson | 0:06475317f283 | 39 | |
DavidEGrayson | 0:06475317f283 | 40 | it cs ; If the bit to send is 1... |
DavidEGrayson | 0:06475317f283 | 41 | strcs r3, [r2] ; Drive the line low. |
DavidEGrayson | 0:06475317f283 | 42 | |
DavidEGrayson | 4:d3b60bd43811 | 43 | ldr r4, =delay_region |
DavidEGrayson | 5:690fdfb595de | 44 | add r4, r4, #68 |
DavidEGrayson | 4:d3b60bd43811 | 45 | blx r4 |
DavidEGrayson | 4:d3b60bd43811 | 46 | |
DavidEGrayson | 5:690fdfb595de | 47 | subs r7, r7, #1 ; Decrement the loop counter. |
DavidEGrayson | 5:690fdfb595de | 48 | bne send_led_strip_bit ; Send another bit if we have not reached zero. |
DavidEGrayson | 4:d3b60bd43811 | 49 | |
DavidEGrayson | 4:d3b60bd43811 | 50 | led_strip_asm_end |
DavidEGrayson | 5:690fdfb595de | 51 | pop {r4, r12, r7, lr} |
DavidEGrayson | 4:d3b60bd43811 | 52 | bx lr |
DavidEGrayson | 4:d3b60bd43811 | 53 | |
DavidEGrayson | 4:d3b60bd43811 | 54 | |
DavidEGrayson | 4:d3b60bd43811 | 55 | delay_region |
DavidEGrayson | 5:690fdfb595de | 56 | ; The following is 128 nops. |
DavidEGrayson | 0:06475317f283 | 57 | nop |
DavidEGrayson | 0:06475317f283 | 58 | nop |
DavidEGrayson | 0:06475317f283 | 59 | nop |
DavidEGrayson | 0:06475317f283 | 60 | nop |
DavidEGrayson | 0:06475317f283 | 61 | nop |
DavidEGrayson | 0:06475317f283 | 62 | nop |
DavidEGrayson | 0:06475317f283 | 63 | nop |
DavidEGrayson | 0:06475317f283 | 64 | nop |
DavidEGrayson | 0:06475317f283 | 65 | nop |
DavidEGrayson | 0:06475317f283 | 66 | nop |
DavidEGrayson | 0:06475317f283 | 67 | nop |
DavidEGrayson | 0:06475317f283 | 68 | nop |
DavidEGrayson | 0:06475317f283 | 69 | nop |
DavidEGrayson | 4:d3b60bd43811 | 70 | nop |
DavidEGrayson | 4:d3b60bd43811 | 71 | nop |
DavidEGrayson | 4:d3b60bd43811 | 72 | nop |
DavidEGrayson | 4:d3b60bd43811 | 73 | |
DavidEGrayson | 0:06475317f283 | 74 | nop |
DavidEGrayson | 0:06475317f283 | 75 | nop |
DavidEGrayson | 0:06475317f283 | 76 | nop |
DavidEGrayson | 0:06475317f283 | 77 | nop |
DavidEGrayson | 0:06475317f283 | 78 | nop |
DavidEGrayson | 0:06475317f283 | 79 | nop |
DavidEGrayson | 0:06475317f283 | 80 | nop |
DavidEGrayson | 0:06475317f283 | 81 | nop |
DavidEGrayson | 0:06475317f283 | 82 | nop |
DavidEGrayson | 0:06475317f283 | 83 | nop |
DavidEGrayson | 0:06475317f283 | 84 | nop |
DavidEGrayson | 0:06475317f283 | 85 | nop |
DavidEGrayson | 0:06475317f283 | 86 | nop |
DavidEGrayson | 0:06475317f283 | 87 | nop |
DavidEGrayson | 0:06475317f283 | 88 | nop |
DavidEGrayson | 0:06475317f283 | 89 | nop |
DavidEGrayson | 4:d3b60bd43811 | 90 | |
DavidEGrayson | 0:06475317f283 | 91 | nop |
DavidEGrayson | 0:06475317f283 | 92 | nop |
DavidEGrayson | 0:06475317f283 | 93 | nop |
DavidEGrayson | 0:06475317f283 | 94 | nop |
DavidEGrayson | 4:d3b60bd43811 | 95 | nop |
DavidEGrayson | 4:d3b60bd43811 | 96 | nop |
DavidEGrayson | 0:06475317f283 | 97 | nop |
DavidEGrayson | 0:06475317f283 | 98 | nop |
DavidEGrayson | 0:06475317f283 | 99 | nop |
DavidEGrayson | 0:06475317f283 | 100 | nop |
DavidEGrayson | 0:06475317f283 | 101 | nop |
DavidEGrayson | 0:06475317f283 | 102 | nop |
DavidEGrayson | 0:06475317f283 | 103 | nop |
DavidEGrayson | 0:06475317f283 | 104 | nop |
DavidEGrayson | 0:06475317f283 | 105 | nop |
DavidEGrayson | 0:06475317f283 | 106 | nop |
DavidEGrayson | 0:06475317f283 | 107 | |
DavidEGrayson | 0:06475317f283 | 108 | nop |
DavidEGrayson | 0:06475317f283 | 109 | nop |
DavidEGrayson | 0:06475317f283 | 110 | nop |
DavidEGrayson | 0:06475317f283 | 111 | nop |
DavidEGrayson | 0:06475317f283 | 112 | nop |
DavidEGrayson | 0:06475317f283 | 113 | nop |
DavidEGrayson | 0:06475317f283 | 114 | nop |
DavidEGrayson | 0:06475317f283 | 115 | nop |
DavidEGrayson | 0:06475317f283 | 116 | nop |
DavidEGrayson | 0:06475317f283 | 117 | nop |
DavidEGrayson | 4:d3b60bd43811 | 118 | nop |
DavidEGrayson | 4:d3b60bd43811 | 119 | nop |
DavidEGrayson | 4:d3b60bd43811 | 120 | nop |
DavidEGrayson | 4:d3b60bd43811 | 121 | nop |
DavidEGrayson | 4:d3b60bd43811 | 122 | nop |
DavidEGrayson | 4:d3b60bd43811 | 123 | nop |
DavidEGrayson | 0:06475317f283 | 124 | |
DavidEGrayson | 0:06475317f283 | 125 | nop |
DavidEGrayson | 0:06475317f283 | 126 | nop |
DavidEGrayson | 0:06475317f283 | 127 | nop |
DavidEGrayson | 0:06475317f283 | 128 | nop |
DavidEGrayson | 0:06475317f283 | 129 | nop |
DavidEGrayson | 0:06475317f283 | 130 | nop |
DavidEGrayson | 0:06475317f283 | 131 | nop |
DavidEGrayson | 0:06475317f283 | 132 | nop |
DavidEGrayson | 0:06475317f283 | 133 | nop |
DavidEGrayson | 0:06475317f283 | 134 | nop |
DavidEGrayson | 4:d3b60bd43811 | 135 | nop |
DavidEGrayson | 4:d3b60bd43811 | 136 | nop |
DavidEGrayson | 4:d3b60bd43811 | 137 | nop |
DavidEGrayson | 4:d3b60bd43811 | 138 | nop |
DavidEGrayson | 4:d3b60bd43811 | 139 | nop |
DavidEGrayson | 4:d3b60bd43811 | 140 | nop |
DavidEGrayson | 0:06475317f283 | 141 | |
DavidEGrayson | 0:06475317f283 | 142 | nop |
DavidEGrayson | 0:06475317f283 | 143 | nop |
DavidEGrayson | 0:06475317f283 | 144 | nop |
DavidEGrayson | 0:06475317f283 | 145 | nop |
DavidEGrayson | 0:06475317f283 | 146 | nop |
DavidEGrayson | 0:06475317f283 | 147 | nop |
DavidEGrayson | 0:06475317f283 | 148 | nop |
DavidEGrayson | 0:06475317f283 | 149 | nop |
DavidEGrayson | 0:06475317f283 | 150 | nop |
DavidEGrayson | 0:06475317f283 | 151 | nop |
DavidEGrayson | 0:06475317f283 | 152 | nop |
DavidEGrayson | 0:06475317f283 | 153 | nop |
DavidEGrayson | 0:06475317f283 | 154 | nop |
DavidEGrayson | 0:06475317f283 | 155 | nop |
DavidEGrayson | 0:06475317f283 | 156 | nop |
DavidEGrayson | 0:06475317f283 | 157 | nop |
DavidEGrayson | 0:06475317f283 | 158 | |
DavidEGrayson | 0:06475317f283 | 159 | nop |
DavidEGrayson | 0:06475317f283 | 160 | nop |
DavidEGrayson | 0:06475317f283 | 161 | nop |
DavidEGrayson | 0:06475317f283 | 162 | nop |
DavidEGrayson | 0:06475317f283 | 163 | nop |
DavidEGrayson | 0:06475317f283 | 164 | nop |
DavidEGrayson | 0:06475317f283 | 165 | nop |
DavidEGrayson | 0:06475317f283 | 166 | nop |
DavidEGrayson | 0:06475317f283 | 167 | nop |
DavidEGrayson | 0:06475317f283 | 168 | nop |
DavidEGrayson | 4:d3b60bd43811 | 169 | nop |
DavidEGrayson | 4:d3b60bd43811 | 170 | nop |
DavidEGrayson | 4:d3b60bd43811 | 171 | nop |
DavidEGrayson | 4:d3b60bd43811 | 172 | nop |
DavidEGrayson | 4:d3b60bd43811 | 173 | nop |
DavidEGrayson | 4:d3b60bd43811 | 174 | nop |
DavidEGrayson | 4:d3b60bd43811 | 175 | |
DavidEGrayson | 0:06475317f283 | 176 | nop |
DavidEGrayson | 0:06475317f283 | 177 | nop |
DavidEGrayson | 0:06475317f283 | 178 | nop |
DavidEGrayson | 0:06475317f283 | 179 | nop |
DavidEGrayson | 0:06475317f283 | 180 | nop |
DavidEGrayson | 0:06475317f283 | 181 | nop |
DavidEGrayson | 4:d3b60bd43811 | 182 | nop |
DavidEGrayson | 4:d3b60bd43811 | 183 | nop |
DavidEGrayson | 4:d3b60bd43811 | 184 | nop |
DavidEGrayson | 4:d3b60bd43811 | 185 | nop |
DavidEGrayson | 4:d3b60bd43811 | 186 | nop |
DavidEGrayson | 4:d3b60bd43811 | 187 | nop |
DavidEGrayson | 4:d3b60bd43811 | 188 | nop |
DavidEGrayson | 4:d3b60bd43811 | 189 | nop |
DavidEGrayson | 4:d3b60bd43811 | 190 | nop |
DavidEGrayson | 4:d3b60bd43811 | 191 | nop |
DavidEGrayson | 5:690fdfb595de | 192 | delay_region_end |
DavidEGrayson | 4:d3b60bd43811 | 193 | bx lr ; return |
DavidEGrayson | 0:06475317f283 | 194 | |
DavidEGrayson | 0:06475317f283 | 195 | END |