f28f8ba568
This was done to allow greatly granularity when deciding what functionality is built into each board's build. For example, this way pulseio can be omitted to allow for something else such as touchio.
88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "mphalport.h"
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#include "shared-bindings/neopixel_write/__init__.h"
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#include "asf/common2/services/delay/delay.h"
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#include "asf/sam0/drivers/port/port.h"
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void common_hal_neopixel_write(const digitalio_digitalinout_obj_t* digitalinout, uint8_t *pixels, uint32_t numBytes) {
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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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// Make sure the NVM cache is consistently timed.
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NVMCTRL->CTRLB.bit.READMODE = NVMCTRL_CTRLB_READMODE_DETERMINISTIC_Val;
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uint32_t pin = digitalinout->pin->pin;
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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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for(;;) {
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*set = pinMask;
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asm("nop; nop;");
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if(p & bitMask) {
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asm("nop; nop; nop; 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;");
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}
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if((bitMask >>= 1) != 0) {
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asm("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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// Speed up! (But inconsistent timing.)
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NVMCTRL->CTRLB.bit.READMODE = NVMCTRL_CTRLB_READMODE_NO_MISS_PENALTY_Val;
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// Turn on interrupts after timing-sensitive code.
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mp_hal_enable_all_interrupts();
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// 50us 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_us(50);
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}
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