Diff: color_pixels.cpp

Revision:

0:1e1ce549ad91

Child:

2:5c805323a2c0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/color_pixels.cpp	Thu Jul 31 11:14:14 2014 +0000
@@ -0,0 +1,135 @@
+/** Color pixels library using WS2812B and nRF51822 (16Hz)
+ *  It's for
+ *    + http://www.seeedstudio.com/depot/Digital-RGB-LED-FlexiStrip-60-LED-1-Meter-p-1666.html
+ *    + http://www.seeedstudio.com/depot/WS2812B-Digital-RGB-LED-Waterproof-FlexiStrip-144-LEDmeter-2-meter-p-1869.html
+ *    + http://www.seeedstudio.com/depot/WS2812B-RGB-LED-with-Integrated-Driver-Chip-10-PCs-pack-p-1675.html
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Seeed Technology Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "color_pixels.h"
+#include "nrf51822.h"
+
+// Generate a high level pulse (0.81us) of WS2812B's 0 code (0.9us +- 0.15us)
+#define COLOR_PIXELS_ONE_HIGH(mask)     \
+            NRF_GPIO->OUTSET = (mask);  \
+            __ASM ( \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                    " NOP\n\t" \
+                ); \
+            NRF_GPIO->OUTCLR = (mask)
+
+// Generate a high level pulse (0.31us) of WS2812B's 0 code (0.35us +- 0.15us)
+#define COLOR_PIXELS_ZERO_HIGH(mask)    \
+            NRF_GPIO->OUTSET = (mask);  \
+            __ASM (  \
+                    " NOP\n\t"  \
+                );  \
+            NRF_GPIO->OUTCLR = (mask)
+
+static void delay_us(uint32_t us)
+{
+    do {
+        __ASM volatile (
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+            "NOP\n\t"
+        );
+    } while (--us);
+}
+
+ColorPixels::ColorPixels(uint8_t pin, uint16_t num)
+{
+    this->pin = pin;
+    this->num = num;
+
+    NRF_GPIO->PIN_CNF[pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
+                             | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
+                             | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
+                             | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
+                             | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+    NRF_GPIO->OUTCLR = (1UL << pin);
+
+    colors = new color_t[num];
+    for (int i = 0; i < num; i++) {
+        colors[i].grb = 0;
+    }
+}
+
+ColorPixels::~ColorPixels()
+{
+    delete colors;
+}
+
+
+void ColorPixels::set_color(uint16_t index, uint8_t r, uint8_t g, uint8_t b)
+{
+    if (index < num) {
+        colors[index].r = r;
+        colors[index].g = g;
+        colors[index].b = b;
+    }
+}
+
+void ColorPixels::update()
+{
+    uint32_t mask =  1 << pin;
+    NRF_GPIO->OUTCLR = mask;
+    delay_us(50);
+    for (int i = 0; i < num; i++) {
+        uint32_t color = colors[i].grb;
+        for (int bit = 0; bit < 24; bit++) {
+            if (color & 1) {
+                COLOR_PIXELS_ONE_HIGH(mask);
+            } else {
+                COLOR_PIXELS_ZERO_HIGH(mask);
+            }
+            color >>= 1;
+        }
+    }
+}
+
+void ColorPixels::clear()
+{
+    for (int i = 0; i < num; i++) {
+        colors[i].grb = 0;
+    }
+
+    update();
+}