David Knight
This library lets you control the addressable RGB LED strips from Pololu Robotics. Forked to add selectable colour order (Support RGB or GRB Leds)
Fork of
PololuLedStrip
by 
David Grayson
Revision 0:06475317f283, committed 2013-02-27
- Comitter:
- DavidEGrayson
- Date:
- Wed Feb 27 00:28:26 2013 +0000
- Child:
- 1:102307d9b701
- Commit message:
- Still working;
Changed in this revision
| PololuLedStrip.h | Show annotated file Show diff for this revision Revisions of this file |
| led_strip_write_color.s | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PololuLedStrip.h Wed Feb 27 00:28:26 2013 +0000
@@ -0,0 +1,58 @@
+#include "mbed.h"
+
+#ifndef _POLOLU_LED_STRIP_H
+#define _POLOLU_LED_STRIP_H
+
+namespace Pololu
+{
+ #ifndef _POLOLU_RGB_COLOR
+ #define _POLOLU_RGB_COLOR
+ typedef struct rgb_color
+ {
+ uint8_t red, green, blue;
+ } rgb_color;
+ #endif
+
+ extern "C" int led_strip_write_color(rgb_color *, volatile uint32_t * set, volatile uint32_t * clear, uint32_t mask);
+
+ class PololuLedStrip
+ {
+ gpio_t gpio;
+ public:
+ PololuLedStrip(PinName pin);
+ void write(rgb_color * colors, unsigned int count);
+ static bool interruptFriendly;
+ };
+
+ bool PololuLedStrip::interruptFriendly;
+
+ PololuLedStrip::PololuLedStrip(PinName pinName)
+ {
+ gpio_init(&gpio, pinName, PIN_OUTPUT);
+ }
+
+ void PololuLedStrip::write(rgb_color * colors, unsigned int count)
+ {
+ __disable_irq(); // Disable interrupts temporarily because we don't want our pulse timing to be messed up.
+
+ while(count--)
+ {
+ led_strip_write_color(colors++, gpio.reg_set, gpio.reg_clr, gpio.mask);
+
+ if (interruptFriendly)
+ {
+ __enable_irq();
+ __nop();
+ __nop();
+ __nop();
+ __disable_irq();
+ }
+ }
+ __enable_irq(); // Re-enable interrupts now that we are done.
+ wait_us(24); // Hold the line low for 24 microseconds to send the reset signal.
+ }
+}
+
+using namespace Pololu;
+
+#endif
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/led_strip_write_color.s Wed Feb 27 00:28:26 2013 +0000
@@ -0,0 +1,285 @@
+ AREA asm_func, CODE, READONLY
+ EXPORT led_strip_write_color
+
+led_strip_write_color
+ push {r12, r7}
+
+ ldr r12, [r0] ; Read the next color.
+ rbit r12, r12 ; Reverse the order of the bits.
+ rev r12, r12 ; Reverse the order of the bytes.
+ mov r7, #24 ; Initialize the loop counter register.
+
+send_led_strip_bit
+ str r3, [r1] ; Drive the line high.
+ rrxs r12, r12 ; Rotate right through carry.
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
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+ nop
+ nop
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+
+ nop
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+ nop
+ nop
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+
+ nop
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+
+ nop
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+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+
+ it cc ; If the bit to send it 0...
+ strcc r3, [r2] ; Drive the line low.
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
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+
+ nop
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+
+ nop
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+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+
+ it cs ; If the bit to send is 1...
+ strcs r3, [r2] ; Drive the line low.
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
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+
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+
+ nop
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+ nop
+ nop
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+
+ nop
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+ nop
+ nop
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+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
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+ nop
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+ nop
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+ nop
+
+ nop
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+
+ nop
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+
+ nop
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+
+ nop
+ nop
+ nop
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+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ sub r7, r7, #1 ; Decrement the loop counter.
+ cbz r7, led_strip_asm_end ; If we have sent 24 bits, go to the end.
+ b send_led_strip_bit ; Otherwise, go back and send another bit.
+
+led_strip_asm_end
+ pop {r12, r7}
+ bx lr
+
+ END
\ No newline at end of file