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