David Knight / PololuLedStrip

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Fork of PololuLedStrip by David Grayson

PololuLedStrip.h@0:06475317f283, 2013-02-27 (annotated)

Committer:
DavidEGrayson
Date:
Wed Feb 27 00:28:26 2013 +0000
Revision:
0:06475317f283
Child:
1:102307d9b701
Still working;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DavidEGrayson 0:06475317f283 1 #include "mbed.h"
DavidEGrayson 0:06475317f283 2
DavidEGrayson 0:06475317f283 3 #ifndef _POLOLU_LED_STRIP_H
DavidEGrayson 0:06475317f283 4 #define _POLOLU_LED_STRIP_H
DavidEGrayson 0:06475317f283 5
DavidEGrayson 0:06475317f283 6 namespace Pololu
DavidEGrayson 0:06475317f283 7 {
DavidEGrayson 0:06475317f283 8 #ifndef _POLOLU_RGB_COLOR
DavidEGrayson 0:06475317f283 9 #define _POLOLU_RGB_COLOR
DavidEGrayson 0:06475317f283 10 typedef struct rgb_color
DavidEGrayson 0:06475317f283 11 {
DavidEGrayson 0:06475317f283 12 uint8_t red, green, blue;
DavidEGrayson 0:06475317f283 13 } rgb_color;
DavidEGrayson 0:06475317f283 14 #endif
DavidEGrayson 0:06475317f283 15
DavidEGrayson 0:06475317f283 16 extern "C" int led_strip_write_color(rgb_color *, volatile uint32_t * set, volatile uint32_t * clear, uint32_t mask);
DavidEGrayson 0:06475317f283 17
DavidEGrayson 0:06475317f283 18 class PololuLedStrip
DavidEGrayson 0:06475317f283 19 {
DavidEGrayson 0:06475317f283 20 gpio_t gpio;
DavidEGrayson 0:06475317f283 21 public:
DavidEGrayson 0:06475317f283 22 PololuLedStrip(PinName pin);
DavidEGrayson 0:06475317f283 23 void write(rgb_color * colors, unsigned int count);
DavidEGrayson 0:06475317f283 24 static bool interruptFriendly;
DavidEGrayson 0:06475317f283 25 };
DavidEGrayson 0:06475317f283 26
DavidEGrayson 0:06475317f283 27 bool PololuLedStrip::interruptFriendly;
DavidEGrayson 0:06475317f283 28
DavidEGrayson 0:06475317f283 29 PololuLedStrip::PololuLedStrip(PinName pinName)
DavidEGrayson 0:06475317f283 30 {
DavidEGrayson 0:06475317f283 31 gpio_init(&gpio, pinName, PIN_OUTPUT);
DavidEGrayson 0:06475317f283 32 }
DavidEGrayson 0:06475317f283 33
DavidEGrayson 0:06475317f283 34 void PololuLedStrip::write(rgb_color * colors, unsigned int count)
DavidEGrayson 0:06475317f283 35 {
DavidEGrayson 0:06475317f283 36 __disable_irq(); // Disable interrupts temporarily because we don't want our pulse timing to be messed up.
DavidEGrayson 0:06475317f283 37
DavidEGrayson 0:06475317f283 38 while(count--)
DavidEGrayson 0:06475317f283 39 {
DavidEGrayson 0:06475317f283 40 led_strip_write_color(colors++, gpio.reg_set, gpio.reg_clr, gpio.mask);
DavidEGrayson 0:06475317f283 41
DavidEGrayson 0:06475317f283 42 if (interruptFriendly)
DavidEGrayson 0:06475317f283 43 {
DavidEGrayson 0:06475317f283 44 __enable_irq();
DavidEGrayson 0:06475317f283 45 __nop();
DavidEGrayson 0:06475317f283 46 __nop();
DavidEGrayson 0:06475317f283 47 __nop();
DavidEGrayson 0:06475317f283 48 __disable_irq();
DavidEGrayson 0:06475317f283 49 }
DavidEGrayson 0:06475317f283 50 }
DavidEGrayson 0:06475317f283 51 __enable_irq(); // Re-enable interrupts now that we are done.
DavidEGrayson 0:06475317f283 52 wait_us(24); // Hold the line low for 24 microseconds to send the reset signal.
DavidEGrayson 0:06475317f283 53 }
DavidEGrayson 0:06475317f283 54 }
DavidEGrayson 0:06475317f283 55
DavidEGrayson 0:06475317f283 56 using namespace Pololu;
DavidEGrayson 0:06475317f283 57
DavidEGrayson 0:06475317f283 58 #endif