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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 hathach for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/mphal.h"
#include "shared-bindings/neopixel_write/__init__.h"
#include "csr.h"
// ICE40 LED Driver hard macro.
// See http://www.latticesemi.com/-/media/LatticeSemi/Documents/ApplicationNotes/IK/ICE40LEDDriverUsageGuide.ashx?document_id=50668
enum led_registers {
LEDDCR0 = 8,
LEDDBR = 9,
LEDDONR = 10,
LEDDOFR = 11,
LEDDBCRR = 5,
LEDDBCFR = 6,
LEDDPWRR = 1,
LEDDPWRG = 2,
LEDDPWRB = 3,
};
// Control register definitions
#define LEDDCR0_LEDDEN (1 << 7)
#define LEDDCR0_FR250 (1 << 6)
#define LEDDCR0_OUTPOL (1 << 5)
#define LEDDCR0_OUTSKEW (1 << 4)
#define LEDDCR0_QUICKSTOP (1 << 3)
#define LEDDCR0_PWM_MODE (1 << 2)
#define LEDDCR0_BRMSBEXT (1 << 0)
// Write a value into the LEDDA_IP register.
static void ledda_write(uint8_t value, uint8_t addr) {
rgb_addr_write(addr);
rgb_dat_write(value);
}
static int ledda_init_done;
static void ledda_init(void) {
if (ledda_init_done)
return;
// Enable the driver
rgb_ctrl_write((1 << CSR_RGB_CTRL_EXE_OFFSET) | (1 << CSR_RGB_CTRL_CURREN_OFFSET) | (1 << CSR_RGB_CTRL_RGBLEDEN_OFFSET));
ledda_write(LEDDCR0_LEDDEN | LEDDCR0_FR250 | LEDDCR0_QUICKSTOP, LEDDCR0);
// Set clock register to 12 MHz / 64 kHz - 1
ledda_write((12000000/64000)-1, LEDDBR);
// Ensure LED "breathe" effect is diabled
ledda_write(0, LEDDBCRR);
ledda_write(0, LEDDBCFR);
// Also disable the LED blink time
ledda_write(0, LEDDONR);
ledda_write(0, LEDDOFR);
ledda_init_done = 1;
}
void common_hal_neopixel_write (const digitalio_digitalinout_obj_t* digitalinout, uint8_t *pixels, uint32_t numBytes) {
(void)digitalinout;
(void)numBytes;
ledda_init();
ledda_write(pixels[0], LEDDPWRR); // Red
ledda_write(pixels[1], LEDDPWRG); // Green
ledda_write(pixels[2], LEDDPWRB); // Blue
}
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