90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
#include "asf/common2/services/delay/delay.h"
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#include "asf/sam0/drivers/port/port.h"
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#include "mphalport.h"
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#include "samdneopixel.h"
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void samd_neopixel_write(uint32_t pin, uint8_t *pixels, uint32_t numBytes, bool is800KHz) {
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// This is adapted directly from the Adafruit NeoPixel library SAMD21G18A code:
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// https://github.com/adafruit/Adafruit_NeoPixel/blob/master/Adafruit_NeoPixel.cpp
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uint8_t *ptr, *end, p, bitMask;
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uint32_t pinMask;
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PortGroup* port;
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// Turn off interrupts of any kind during timing-sensitive code.
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mp_hal_disable_all_interrupts();
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port = port_get_group_from_gpio_pin(pin);
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pinMask = (1UL << (pin % 32)); // From port_pin_set_output_level ASF code.
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ptr = pixels;
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end = ptr + numBytes;
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p = *ptr++;
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bitMask = 0x80;
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volatile uint32_t *set = &(port->OUTSET.reg),
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*clr = &(port->OUTCLR.reg);
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if(is800KHz) {
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for(;;) {
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*set = pinMask;
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asm("nop; nop; nop; nop; nop; nop; nop; nop;");
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if(p & bitMask) {
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asm("nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop;");
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*clr = pinMask;
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} else {
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*clr = pinMask;
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asm("nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop;");
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}
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if(bitMask >>= 1) {
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asm("nop; nop; nop; nop; nop; nop; nop; nop; nop;");
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} else {
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if(ptr >= end) break;
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p = *ptr++;
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bitMask = 0x80;
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}
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}
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} else { // 400 KHz bitstream
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for(;;) {
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*set = pinMask;
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asm("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;");
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if(p & bitMask) {
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asm("nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop;");
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*clr = pinMask;
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} else {
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*clr = pinMask;
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asm("nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop;");
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}
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asm("nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;"
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"nop; nop; nop; nop; nop; nop; nop; nop;");
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if(bitMask >>= 1) {
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asm("nop; nop; nop; nop; nop; nop; nop;");
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} else {
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if(ptr >= end) break;
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p = *ptr++;
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bitMask = 0x80;
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}
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}
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}
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// Turn on interrupts after timing-sensitive code.
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mp_hal_enable_all_interrupts();
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// 50ms delay to let pixels latch to the data that was just sent.
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// This could be optimized to only occur before pixel writes when necessary,
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// like in the Arduino library.
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delay_ms(50);
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}
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