Tapton Eesarm
school project using led strip
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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
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+ 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
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+
+ nop
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+
+ 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
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+ 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