410 lines
9.4 KiB
C
410 lines
9.4 KiB
C
/*
|
|
* Copyright (c) 2017 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/*
|
|
* References:
|
|
*
|
|
* https://www.microbit.co.uk/device/screen
|
|
* https://lancaster-university.github.io/microbit-docs/ubit/display/
|
|
*/
|
|
|
|
#include <zephyr.h>
|
|
#include <init.h>
|
|
#include <board.h>
|
|
#include <gpio.h>
|
|
#include <device.h>
|
|
#include <string.h>
|
|
#include <misc/printk.h>
|
|
|
|
#include <display/mb_display.h>
|
|
|
|
#include "mb_font.h"
|
|
|
|
#define MODE_MASK BIT_MASK(16)
|
|
|
|
#define DISPLAY_ROWS 3
|
|
#define DISPLAY_COLS 9
|
|
|
|
#define SCROLL_OFF 0
|
|
#define SCROLL_START 1
|
|
|
|
#define SCROLL_DEFAULT_DURATION K_MSEC(80)
|
|
|
|
struct mb_display {
|
|
struct device *dev; /* GPIO device */
|
|
|
|
struct k_timer timer; /* Rendering timer */
|
|
|
|
uint8_t img_count; /* Image count */
|
|
|
|
uint8_t cur_img; /* Current image or character to show */
|
|
|
|
uint8_t scroll:3, /* Scroll shift */
|
|
first:1, /* First frame of a scroll sequence */
|
|
loop:1, /* Loop to beginning */
|
|
text:1, /* We're showing a string (not image) */
|
|
img_sep:1; /* One column image separation */
|
|
|
|
/* The following variables track the currently shown image */
|
|
uint8_t cur; /* Currently rendered row */
|
|
uint32_t row[3]; /* Content (columns) for each row */
|
|
int64_t expiry; /* When to stop showing current image */
|
|
int32_t duration; /* Duration for each shown image */
|
|
|
|
union {
|
|
const struct mb_image *img; /* Array of images to show */
|
|
const char *str; /* String to be shown */
|
|
};
|
|
|
|
/* Buffer for printed strings */
|
|
char str_buf[CONFIG_MICROBIT_DISPLAY_STR_MAX];
|
|
};
|
|
|
|
struct x_y {
|
|
uint8_t x:4,
|
|
y:4;
|
|
};
|
|
|
|
/* Where the X,Y coordinates of each row/col are found.
|
|
* The top left corner has the coordinates 0,0.
|
|
*/
|
|
static const struct x_y map[DISPLAY_ROWS][DISPLAY_COLS] = {
|
|
{{0, 0}, {2, 0}, {4, 0}, {4, 3}, {3, 3}, {2, 3}, {1, 3}, {0, 3}, {1, 2} },
|
|
{{4, 2}, {0, 2}, {2, 2}, {1, 0}, {3, 0}, {3, 4}, {1, 4}, {0, 0}, {0, 0} },
|
|
{{2, 4}, {4, 4}, {0, 4}, {0, 1}, {1, 1}, {2, 1}, {3, 1}, {4, 1}, {3, 2} },
|
|
};
|
|
|
|
/* Mask of all the column bits */
|
|
static const uint32_t col_mask = (((~0UL) << LED_COL1_GPIO_PIN) &
|
|
((~0UL) >> (31 - LED_COL9_GPIO_PIN)));
|
|
|
|
static inline const struct mb_image *get_font(char ch)
|
|
{
|
|
if (ch < MB_FONT_START || ch > MB_FONT_END) {
|
|
return &mb_font[' ' - MB_FONT_START];
|
|
}
|
|
|
|
return &mb_font[ch - MB_FONT_START];
|
|
}
|
|
|
|
#define GET_PIXEL(img, x, y) ((img)->row[y] & BIT(x))
|
|
|
|
/* Precalculate all three rows of an image and start the rendering. */
|
|
static void start_image(struct mb_display *disp, const struct mb_image *img)
|
|
{
|
|
int row, col;
|
|
|
|
for (row = 0; row < DISPLAY_ROWS; row++) {
|
|
disp->row[row] = 0;
|
|
|
|
for (col = 0; col < DISPLAY_COLS; col++) {
|
|
if (GET_PIXEL(img, map[row][col].x, map[row][col].y)) {
|
|
disp->row[row] |= BIT(LED_COL1_GPIO_PIN + col);
|
|
}
|
|
}
|
|
|
|
disp->row[row] = ~disp->row[row] & col_mask;
|
|
disp->row[row] |= BIT(LED_ROW1_GPIO_PIN + row);
|
|
}
|
|
|
|
disp->cur = 0;
|
|
|
|
if (disp->duration == K_FOREVER) {
|
|
disp->expiry = K_FOREVER;
|
|
} else {
|
|
disp->expiry = k_uptime_get() + disp->duration;
|
|
}
|
|
|
|
k_timer_start(&disp->timer, K_NO_WAIT, K_MSEC(5));
|
|
}
|
|
|
|
#define ROW_PIN(n) (LED_ROW1_GPIO_PIN + (n))
|
|
|
|
static inline void update_pins(struct mb_display *disp, uint32_t val)
|
|
{
|
|
if (IS_ENABLED(CONFIG_MICROBIT_DISPLAY_PIN_GRANULARITY)) {
|
|
uint32_t pin, prev = (disp->cur + 2) % 3;
|
|
|
|
/* Disable the previous row */
|
|
gpio_pin_write(disp->dev, ROW_PIN(prev), 0);
|
|
|
|
/* Set the column pins to their correct values */
|
|
for (pin = LED_COL1_GPIO_PIN; pin <= LED_COL9_GPIO_PIN; pin++) {
|
|
gpio_pin_write(disp->dev, pin, !!(val & BIT(pin)));
|
|
}
|
|
|
|
/* Enable the new row */
|
|
gpio_pin_write(disp->dev, ROW_PIN(disp->cur), 1);
|
|
} else {
|
|
gpio_port_write(disp->dev, val);
|
|
}
|
|
}
|
|
|
|
static void reset_display(struct mb_display *disp)
|
|
{
|
|
k_timer_stop(&disp->timer);
|
|
|
|
disp->str = NULL;
|
|
disp->cur_img = 0;
|
|
disp->img = NULL;
|
|
disp->img_count = 0;
|
|
disp->scroll = SCROLL_OFF;
|
|
}
|
|
|
|
static const struct mb_image *current_img(struct mb_display *disp)
|
|
{
|
|
if (disp->scroll && disp->first) {
|
|
return get_font(' ');
|
|
}
|
|
|
|
if (disp->text) {
|
|
return get_font(disp->str[disp->cur_img]);
|
|
} else {
|
|
return &disp->img[disp->cur_img];
|
|
}
|
|
}
|
|
|
|
static const struct mb_image *next_img(struct mb_display *disp)
|
|
{
|
|
if (disp->text) {
|
|
if (disp->first) {
|
|
return get_font(disp->str[0]);
|
|
} else if (disp->str[disp->cur_img]) {
|
|
return get_font(disp->str[disp->cur_img + 1]);
|
|
} else {
|
|
return get_font(' ');
|
|
}
|
|
} else {
|
|
if (disp->first) {
|
|
return &disp->img[0];
|
|
} else if (disp->cur_img < (disp->img_count - 1)) {
|
|
return &disp->img[disp->cur_img + 1];
|
|
} else {
|
|
return get_font(' ');
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline bool last_frame(struct mb_display *disp)
|
|
{
|
|
if (disp->text) {
|
|
return (disp->str[disp->cur_img] == '\0');
|
|
} else {
|
|
return (disp->cur_img >= disp->img_count);
|
|
}
|
|
}
|
|
|
|
static inline uint8_t scroll_steps(struct mb_display *disp)
|
|
{
|
|
return 5 + disp->img_sep;
|
|
}
|
|
|
|
static void update_scroll(struct mb_display *disp)
|
|
{
|
|
if (disp->scroll < scroll_steps(disp)) {
|
|
struct mb_image img;
|
|
int i;
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
const struct mb_image *i1 = current_img(disp);
|
|
const struct mb_image *i2 = next_img(disp);
|
|
|
|
img.row[i] = ((i1->row[i] >> disp->scroll) |
|
|
(i2->row[i] << (scroll_steps(disp) -
|
|
disp->scroll)));
|
|
}
|
|
|
|
disp->scroll++;
|
|
start_image(disp, &img);
|
|
} else {
|
|
if (disp->first) {
|
|
disp->first = 0;
|
|
} else {
|
|
disp->cur_img++;
|
|
}
|
|
|
|
if (last_frame(disp)) {
|
|
if (!disp->loop) {
|
|
reset_display(disp);
|
|
return;
|
|
}
|
|
|
|
disp->cur_img = 0;
|
|
disp->first = 1;
|
|
}
|
|
|
|
disp->scroll = SCROLL_START;
|
|
start_image(disp, current_img(disp));
|
|
}
|
|
}
|
|
|
|
static void update_image(struct mb_display *disp)
|
|
{
|
|
disp->cur_img++;
|
|
|
|
if (last_frame(disp)) {
|
|
if (!disp->loop) {
|
|
reset_display(disp);
|
|
return;
|
|
}
|
|
|
|
disp->cur_img = 0;
|
|
}
|
|
|
|
start_image(disp, current_img(disp));
|
|
}
|
|
|
|
static void show_row(struct k_timer *timer)
|
|
{
|
|
struct mb_display *disp = CONTAINER_OF(timer, struct mb_display, timer);
|
|
|
|
update_pins(disp, disp->row[disp->cur]);
|
|
disp->cur = (disp->cur + 1) % DISPLAY_ROWS;
|
|
|
|
if (disp->cur == 0 && disp->expiry != K_FOREVER &&
|
|
k_uptime_get() > disp->expiry) {
|
|
if (disp->scroll) {
|
|
update_scroll(disp);
|
|
} else {
|
|
update_image(disp);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void clear_display(struct k_timer *timer)
|
|
{
|
|
struct mb_display *disp = CONTAINER_OF(timer, struct mb_display, timer);
|
|
|
|
update_pins(disp, col_mask);
|
|
}
|
|
|
|
static struct mb_display display = {
|
|
.timer = K_TIMER_INITIALIZER(display.timer, show_row, clear_display),
|
|
};
|
|
|
|
static void start_scroll(struct mb_display *disp, int32_t duration)
|
|
{
|
|
/* Divide total duration by number of scrolling steps */
|
|
if (duration) {
|
|
disp->duration = duration / scroll_steps(disp);
|
|
} else {
|
|
disp->duration = SCROLL_DEFAULT_DURATION;
|
|
}
|
|
|
|
disp->scroll = SCROLL_START;
|
|
disp->first = 1;
|
|
disp->cur_img = 0;
|
|
start_image(disp, get_font(' '));
|
|
}
|
|
|
|
static void start_single(struct mb_display *disp, int32_t duration)
|
|
{
|
|
disp->duration = duration;
|
|
|
|
if (disp->text) {
|
|
start_image(disp, get_font(disp->str[0]));
|
|
} else {
|
|
start_image(disp, disp->img);
|
|
}
|
|
}
|
|
|
|
void mb_display_image(struct mb_display *disp, uint32_t mode, int32_t duration,
|
|
const struct mb_image *img, uint8_t img_count)
|
|
{
|
|
reset_display(disp);
|
|
|
|
__ASSERT(img && img_count > 0, "Invalid parameters");
|
|
|
|
disp->text = 0;
|
|
disp->img_count = img_count;
|
|
disp->img = img;
|
|
disp->img_sep = 0;
|
|
disp->cur_img = 0;
|
|
disp->loop = !!(mode & MB_DISPLAY_FLAG_LOOP);
|
|
|
|
switch (mode & MODE_MASK) {
|
|
case MB_DISPLAY_MODE_DEFAULT:
|
|
case MB_DISPLAY_MODE_SINGLE:
|
|
start_single(disp, duration);
|
|
break;
|
|
case MB_DISPLAY_MODE_SCROLL:
|
|
start_scroll(disp, duration);
|
|
break;
|
|
default:
|
|
__ASSERT(0, "Invalid display mode");
|
|
}
|
|
}
|
|
|
|
void mb_display_stop(struct mb_display *disp)
|
|
{
|
|
reset_display(disp);
|
|
}
|
|
|
|
void mb_display_print(struct mb_display *disp, uint32_t mode,
|
|
int32_t duration, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
reset_display(disp);
|
|
|
|
va_start(ap, fmt);
|
|
vsnprintk(disp->str_buf, sizeof(disp->str_buf), fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (disp->str_buf[0] == '\0') {
|
|
return;
|
|
}
|
|
|
|
disp->str = disp->str_buf;
|
|
disp->text = 1;
|
|
disp->img_sep = 1;
|
|
disp->cur_img = 0;
|
|
disp->loop = !!(mode & MB_DISPLAY_FLAG_LOOP);
|
|
|
|
switch (mode & MODE_MASK) {
|
|
case MB_DISPLAY_MODE_DEFAULT:
|
|
case MB_DISPLAY_MODE_SCROLL:
|
|
start_scroll(disp, duration);
|
|
break;
|
|
case MB_DISPLAY_MODE_SINGLE:
|
|
start_single(disp, duration);
|
|
break;
|
|
default:
|
|
__ASSERT(0, "Invalid display mode");
|
|
}
|
|
}
|
|
|
|
struct mb_display *mb_display_get(void)
|
|
{
|
|
return &display;
|
|
}
|
|
|
|
static int mb_display_init(struct device *dev)
|
|
{
|
|
ARG_UNUSED(dev);
|
|
|
|
display.dev = device_get_binding(CONFIG_GPIO_NRF5_P0_DEV_NAME);
|
|
|
|
__ASSERT(dev, "No GPIO device found");
|
|
|
|
gpio_pin_configure(display.dev, LED_ROW1_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_ROW2_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_ROW3_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL1_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL2_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL3_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL4_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL5_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL6_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL7_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL8_GPIO_PIN, GPIO_DIR_OUT);
|
|
gpio_pin_configure(display.dev, LED_COL9_GPIO_PIN, GPIO_DIR_OUT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
SYS_INIT(mb_display_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
|