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