rename lib

lib/Adafruit_NeoPixel/kendyte_k210.c

@@ -0,0 +1,74 @@
+// This is a mash-up of the Due show() code + insights from Michael Miller's
+// ESP8266 work for the NeoPixelBus library: github.com/Makuna/NeoPixelBus
+// Needs to be a separate .c file to enforce ICACHE_RAM_ATTR execution.
+#if defined(K210) 
+#define KENDRYTE_K210 1
+#endif
+
+#if defined(KENDRYTE_K210)
+
+#include <Arduino.h>
+#include "sysctl.h"
+
+void  k210Show(
+    uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz)
+{
+
+#define CYCLES_800_T0H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 2500000) // 0.4us
+#define CYCLES_800_T1H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 1250000) // 0.8us
+#define CYCLES_800 (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 800000)      // 1.25us per bit
+#define CYCLES_400_T0H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 2000000) // 0.5uS
+#define CYCLES_400_T1H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 833333)  // 1.2us
+#define CYCLES_400 (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 400000)      // 2.5us per bit
+
+    uint8_t *p, *end, pix, mask;
+    uint32_t t, time0, time1, period, c, startTime;
+
+    p = pixels;
+    end = p + numBytes;
+    pix = *p++;
+    mask = 0x80;
+    startTime = 0;
+
+#ifdef NEO_KHZ400
+    if (is800KHz)
+    {
+#endif
+        time0 = CYCLES_800_T0H;
+        time1 = CYCLES_800_T1H;
+        period = CYCLES_800;
+#ifdef NEO_KHZ400
+    }
+    else
+    { // 400 KHz bitstream
+        time0 = CYCLES_400_T0H;
+        time1 = CYCLES_400_T1H;
+        period = CYCLES_400;
+    }
+#endif
+
+    for (t = time0;; t = time0)
+    {
+        if (pix & mask)
+            t = time1; // Bit high duration
+        while (((c = read_cycle()) - startTime) < period)
+            ; // Wait for bit start
+        digitalWrite(pin, HIGH);
+        startTime = c; // Save start time
+        while (((c = read_cycle()) - startTime) < t)
+            ; // Wait high duration
+        digitalWrite(pin, LOW);
+
+        if (!(mask >>= 1))
+        { // Next bit/byte
+            if (p >= end)
+                break;
+            pix = *p++;
+            mask = 0x80;
+        }
+    }
+    while ((read_cycle() - startTime) < period)
+        ; // Wait for last bit
+}
+
+#endif // KENDRYTE_K210