262 lines
6.6 KiB
C++
262 lines
6.6 KiB
C++
#include <string.h>
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#include <math.h>
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#include "hardware/pwm.h"
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#include "badger2040.hpp"
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namespace pimoroni {
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Badger2040::Badger2040()
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: uc8151(296, 128, spi0, CS, DC, CLK, MOSI, BUSY, RESET) {
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}
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void Badger2040::init() {
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// set clock speed to 12MHz to reduce the maximum current draw on the
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// battery. when updating a small, monochrome, display only every few
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// seconds or so then you don't need much processing power anyway...
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set_sys_clock_khz(48000, true);
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gpio_set_function(ENABLE_3V3, GPIO_FUNC_SIO);
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gpio_set_dir(ENABLE_3V3, GPIO_OUT);
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gpio_put(ENABLE_3V3, 1);
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gpio_set_function(A, GPIO_FUNC_SIO);
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gpio_set_dir(A, GPIO_IN);
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gpio_put(A, 1);
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gpio_set_function(B, GPIO_FUNC_SIO);
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gpio_set_dir(B, GPIO_IN);
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gpio_put(B, 1);
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gpio_set_function(C, GPIO_FUNC_SIO);
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gpio_set_dir(C, GPIO_IN);
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gpio_put(C, 1);
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gpio_set_function(D, GPIO_FUNC_SIO);
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gpio_set_dir(D, GPIO_IN);
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gpio_put(D, 1);
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gpio_set_function(USER, GPIO_FUNC_SIO);
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gpio_set_dir(USER, GPIO_IN);
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gpio_put(USER, 1);
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gpio_set_function(VBUS_DETECT, GPIO_FUNC_SIO);
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gpio_set_dir(VBUS_DETECT, GPIO_IN);
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gpio_put(VBUS_DETECT, 1);
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// read initial button states
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uint32_t mask = (1UL << A) | (1UL << B) | (1UL << C) | (1UL << D) | (1UL << E);
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_wake_button_states |= gpio_get_all() & mask;
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// wait for button to be released before continuing
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while(gpio_get_all() & mask) {
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tight_loop_contents();
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}
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// led control pin
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pwm_config cfg = pwm_get_default_config();
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pwm_set_wrap(pwm_gpio_to_slice_num(LED), 65535);
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pwm_init(pwm_gpio_to_slice_num(LED), &cfg, true);
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gpio_set_function(LED, GPIO_FUNC_PWM);
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led(0);
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uc8151.init();
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// TODO: set default image?
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}
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void Badger2040::clear() {
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for(uint32_t y = 0; y < 128; y++) {
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for(uint32_t x = 0; x < 296; x++) {
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pixel(x, y);
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}
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}
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}
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void Badger2040::halt() {
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gpio_put(ENABLE_3V3, 0);
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// don't allow any more code to execute while power rail drops
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while(true) {}
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}
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uint8_t _dither_value(int32_t x, int32_t y, uint8_t p) {
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// ordered dither matrix used in 4-bit mode
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static uint8_t _odm[16] = {
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0, 8, 2, 10,
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12, 4, 14, 6,
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3, 11, 1, 9,
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15, 7, 13, 5
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};
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// calculate dither matrix offset
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uint32_t dmo = (x & 0b11) | ((y & 0b11) << 2);
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if(p == 0) {
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return 1;
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}else if(p == 15) {
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return 0;
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}else{
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return p <= _odm[dmo] ? 1 : 0;
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}
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}
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void Badger2040::pixel(int32_t x, int32_t y) {
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if(_thickness == 1) {
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uc8151.pixel(x, y, _dither_value(x, y, _pen));
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}else{
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uint8_t ht = _thickness / 2;
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for(int sy = 0; sy < _thickness; sy++) {
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for(int sx = 0; sx < _thickness; sx++) {
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uc8151.pixel(x + sx - ht, y + sy - ht, _dither_value(x + sx - ht, y + sy - ht, _pen));
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}
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}
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}
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}
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void Badger2040::rectangle(int32_t x, int32_t y, int32_t w, int32_t h) {
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for(int cy = y; cy < y + h; cy++) {
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for(int cx = x; cx < x + w; cx++) {
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pixel(cx, cy);
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}
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}
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}
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void Badger2040::line(int32_t x1, int32_t y1, int32_t x2, int32_t y2) {
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int32_t x = x1, y = y1, dx, dy, incx, incy, balance;
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if(x2 >= x1) {dx = x2 - x1; incx = 1;} else {dx = x1 - x2; incx = -1;}
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if(y2 >= y1) {dy = y2 - y1; incy = 1;} else {dy = y1 - y2; incy = -1;}
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if(dx >= dy) {
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dy <<= 1; balance = dy - dx; dx <<= 1;
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while(x != x2) {
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pixel(x, y);
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if (balance >= 0) {y += incy; balance -= dx;}
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balance += dy; x += incx;
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}
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} else {
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dx <<= 1; balance = dx - dy; dy <<= 1;
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while(y != y2) {
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pixel(x, y);
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if(balance >= 0) {x += incx; balance -= dy;}
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balance += dx; y += incy;
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}
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}
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}
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void Badger2040::update_button_states() {
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uint32_t mask = (1UL << A) | (1UL << B) | (1UL << C) | (1UL << D) | (1UL << E);
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_button_states |= gpio_get_all() & mask;
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}
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void Badger2040::update() {
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// wait for display to not be busy
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while(uc8151.is_busy()) {
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tight_loop_contents();
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}
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uc8151.update(false);
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_button_states = 0;
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// wait for display to not be busy but sample buttons in case they are
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// pressed during this time
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while(uc8151.is_busy()) {
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update_button_states();
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tight_loop_contents();
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}
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uc8151.off();
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}
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const hershey_font_glyph_t* Badger2040::glyph_data(unsigned char c) {
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if(c < 32 || c > 127) {
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return nullptr;
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}
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return &_font->chars[c - 32];
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}
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int32_t Badger2040::glyph(unsigned char c, int32_t x, int32_t y, float s) {
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// if space character then return a width to move the caret by
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const hershey_font_glyph_t *gd = glyph_data(c);
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// if glyph data not found (id too great) then skip
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if(!gd) {
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return 0;
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}
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const int8_t *pv = gd->vertices;
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int8_t cx = (*pv++) * s;
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int8_t cy = (*pv++) * s;
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bool pen_down = true;
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for(uint32_t i = 1; i < gd->vertex_count; i++) {
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if(pv[0] == -128 && pv[1] == -128) {
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pen_down = false;
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pv += 2;
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}else{
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int8_t nx = (*pv++) * s;
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int8_t ny = (*pv++) * s;
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if(pen_down) {
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line(cx + x, cy + y, nx + x, ny + y);
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}
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cx = nx;
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cy = ny;
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pen_down = true;
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}
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}
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return gd->width * s;
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}
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void Badger2040::text(std::string message, int32_t x, int32_t y, float s) {
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int32_t cx = x;
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int32_t cy = y;
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for(auto &c : message) {
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cx += glyph(c, cx, cy, s);
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}
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}
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void Badger2040::font(std::string name) {
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// check that font exists and assign it
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if(fonts.find(name) != fonts.end()) {
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_font = fonts[name];
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}
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}
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void Badger2040::pen(uint8_t pen) {
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_pen = pen;
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}
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void Badger2040::thickness(uint8_t thickness) {
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_thickness = thickness;
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}
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void Badger2040::led(uint8_t brightness) {
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// set the led brightness from 1 to 256 with gamma correction
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float gamma = 2.8;
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uint16_t v = (uint16_t)(pow((float)(brightness) / 256.0f, gamma) * 65535.0f + 0.5f);
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pwm_set_gpio_level(LED, v);
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}
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bool Badger2040::pressed(uint8_t button) {
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return (_button_states & (1UL << button)) != 0;
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}
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bool Badger2040::pressed_to_wake(uint8_t button) {
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return (_wake_button_states & (1UL << button)) != 0;
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}
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void Badger2040::wait_for_press() {
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while(_button_states == 0) {
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update_button_states();
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tight_loop_contents();
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}
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}
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} |