454 lines
10 KiB
C
454 lines
10 KiB
C
/*
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* Copyright (c) 2017 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/*
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* References:
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*
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* https://www.microbit.co.uk/device/screen
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* https://lancaster-university.github.io/microbit-docs/ubit/display/
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*/
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#include <zephyr.h>
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#include <init.h>
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#include <drivers/gpio.h>
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#include <device.h>
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#include <string.h>
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#include <sys/printk.h>
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#include <display/mb_display.h>
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#include "mb_font.h"
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#define MODE_MASK BIT_MASK(16)
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/* Onboard LED Row 1 */
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#define LED_ROW1_GPIO_PIN 13
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#define LED_ROW1_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Row 2 */
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#define LED_ROW2_GPIO_PIN 14
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#define LED_ROW2_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Row 3 */
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#define LED_ROW3_GPIO_PIN 15
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#define LED_ROW3_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 1 */
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#define LED_COL1_GPIO_PIN 4
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#define LED_COL1_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 2 */
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#define LED_COL2_GPIO_PIN 5
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#define LED_COL2_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 3 */
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#define LED_COL3_GPIO_PIN 6
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#define LED_COL3_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 4 */
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#define LED_COL4_GPIO_PIN 7
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#define LED_COL4_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 5 */
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#define LED_COL5_GPIO_PIN 8
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#define LED_COL5_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 6 */
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#define LED_COL6_GPIO_PIN 9
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#define LED_COL6_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 7 */
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#define LED_COL7_GPIO_PIN 10
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#define LED_COL7_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 8 */
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#define LED_COL8_GPIO_PIN 11
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#define LED_COL8_GPIO_PORT DT_GPIO_P0_DEV_NAME
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/* Onboard LED Column 9 */
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#define LED_COL9_GPIO_PIN 12
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#define LED_COL9_GPIO_PORT DT_GPIO_P0_DEV_NAME
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#define DISPLAY_ROWS 3
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#define DISPLAY_COLS 9
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#define SCROLL_OFF 0
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#define SCROLL_START 1
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#define SCROLL_DEFAULT_DURATION K_MSEC(80)
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struct mb_display {
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struct device *dev; /* GPIO device */
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struct k_timer timer; /* Rendering timer */
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u8_t img_count; /* Image count */
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u8_t cur_img; /* Current image or character to show */
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u8_t scroll:3, /* Scroll shift */
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first:1, /* First frame of a scroll sequence */
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loop:1, /* Loop to beginning */
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text:1, /* We're showing a string (not image) */
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img_sep:1; /* One column image separation */
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/* The following variables track the currently shown image */
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u8_t cur; /* Currently rendered row */
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u32_t row[3]; /* Content (columns) for each row */
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s64_t expiry; /* When to stop showing current image */
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s32_t duration; /* Duration for each shown image */
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union {
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const struct mb_image *img; /* Array of images to show */
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const char *str; /* String to be shown */
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};
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/* Buffer for printed strings */
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char str_buf[CONFIG_MICROBIT_DISPLAY_STR_MAX];
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};
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struct x_y {
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u8_t x:4,
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y:4;
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};
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/* Where the X,Y coordinates of each row/col are found.
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* The top left corner has the coordinates 0,0.
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*/
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static const struct x_y map[DISPLAY_ROWS][DISPLAY_COLS] = {
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{{0, 0}, {2, 0}, {4, 0}, {4, 3}, {3, 3}, {2, 3}, {1, 3}, {0, 3}, {1, 2} },
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{{4, 2}, {0, 2}, {2, 2}, {1, 0}, {3, 0}, {3, 4}, {1, 4}, {0, 0}, {0, 0} },
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{{2, 4}, {4, 4}, {0, 4}, {0, 1}, {1, 1}, {2, 1}, {3, 1}, {4, 1}, {3, 2} },
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};
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/* Mask of all the column bits */
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static const u32_t col_mask = (((~0UL) << LED_COL1_GPIO_PIN) &
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((~0UL) >> (31 - LED_COL9_GPIO_PIN)));
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static inline const struct mb_image *get_font(char ch)
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{
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if (ch < MB_FONT_START || ch > MB_FONT_END) {
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return &mb_font[' ' - MB_FONT_START];
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}
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return &mb_font[ch - MB_FONT_START];
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}
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#define GET_PIXEL(img, x, y) ((img)->row[y] & BIT(x))
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/* Precalculate all three rows of an image and start the rendering. */
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static void start_image(struct mb_display *disp, const struct mb_image *img)
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{
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int row, col;
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for (row = 0; row < DISPLAY_ROWS; row++) {
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disp->row[row] = 0U;
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for (col = 0; col < DISPLAY_COLS; col++) {
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if (GET_PIXEL(img, map[row][col].x, map[row][col].y)) {
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disp->row[row] |= BIT(LED_COL1_GPIO_PIN + col);
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}
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}
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disp->row[row] = ~disp->row[row] & col_mask;
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disp->row[row] |= BIT(LED_ROW1_GPIO_PIN + row);
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}
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disp->cur = 0U;
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if (disp->duration == K_FOREVER) {
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disp->expiry = K_FOREVER;
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} else {
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disp->expiry = k_uptime_get() + disp->duration;
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}
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k_timer_start(&disp->timer, K_NO_WAIT, K_MSEC(4));
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}
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#define ROW_PIN(n) (LED_ROW1_GPIO_PIN + (n))
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static inline void update_pins(struct mb_display *disp, u32_t val)
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{
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u32_t pin, prev = (disp->cur + 2) % 3;
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/* Disable the previous row */
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gpio_pin_set_raw(disp->dev, ROW_PIN(prev), 0);
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/* Set the column pins to their correct values */
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for (pin = LED_COL1_GPIO_PIN; pin <= LED_COL9_GPIO_PIN; pin++) {
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gpio_pin_set_raw(disp->dev, pin, !!(val & BIT(pin)));
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}
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/* Enable the new row */
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gpio_pin_set_raw(disp->dev, ROW_PIN(disp->cur), 1);
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}
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static void reset_display(struct mb_display *disp)
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{
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k_timer_stop(&disp->timer);
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disp->str = NULL;
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disp->cur_img = 0U;
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disp->img = NULL;
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disp->img_count = 0U;
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disp->scroll = SCROLL_OFF;
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}
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static const struct mb_image *current_img(struct mb_display *disp)
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{
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if (disp->scroll && disp->first) {
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return get_font(' ');
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}
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if (disp->text) {
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return get_font(disp->str[disp->cur_img]);
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} else {
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return &disp->img[disp->cur_img];
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}
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}
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static const struct mb_image *next_img(struct mb_display *disp)
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{
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if (disp->text) {
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if (disp->first) {
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return get_font(disp->str[0]);
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} else if (disp->str[disp->cur_img]) {
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return get_font(disp->str[disp->cur_img + 1]);
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} else {
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return get_font(' ');
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}
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} else {
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if (disp->first) {
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return &disp->img[0];
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} else if (disp->cur_img < (disp->img_count - 1)) {
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return &disp->img[disp->cur_img + 1];
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} else {
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return get_font(' ');
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}
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}
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}
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static inline bool last_frame(struct mb_display *disp)
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{
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if (disp->text) {
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return (disp->str[disp->cur_img] == '\0');
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} else {
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return (disp->cur_img >= disp->img_count);
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}
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}
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static inline u8_t scroll_steps(struct mb_display *disp)
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{
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return 5 + disp->img_sep;
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}
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static void update_scroll(struct mb_display *disp)
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{
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if (disp->scroll < scroll_steps(disp)) {
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struct mb_image img;
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int i;
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for (i = 0; i < 5; i++) {
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const struct mb_image *i1 = current_img(disp);
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const struct mb_image *i2 = next_img(disp);
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img.row[i] = ((i1->row[i] >> disp->scroll) |
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(i2->row[i] << (scroll_steps(disp) -
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disp->scroll)));
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}
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disp->scroll++;
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start_image(disp, &img);
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} else {
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if (disp->first) {
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disp->first = 0U;
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} else {
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disp->cur_img++;
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}
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if (last_frame(disp)) {
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if (!disp->loop) {
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reset_display(disp);
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return;
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}
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disp->cur_img = 0U;
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disp->first = 1U;
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}
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disp->scroll = SCROLL_START;
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start_image(disp, current_img(disp));
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}
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}
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static void update_image(struct mb_display *disp)
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{
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disp->cur_img++;
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if (last_frame(disp)) {
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if (!disp->loop) {
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reset_display(disp);
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return;
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}
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disp->cur_img = 0U;
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}
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start_image(disp, current_img(disp));
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}
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static void show_row(struct k_timer *timer)
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{
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struct mb_display *disp = CONTAINER_OF(timer, struct mb_display, timer);
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update_pins(disp, disp->row[disp->cur]);
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disp->cur = (disp->cur + 1) % DISPLAY_ROWS;
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if (disp->cur == 0U && disp->expiry != K_FOREVER &&
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k_uptime_get() > disp->expiry) {
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if (disp->scroll) {
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update_scroll(disp);
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} else {
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update_image(disp);
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}
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}
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}
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static void clear_display(struct k_timer *timer)
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{
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struct mb_display *disp = CONTAINER_OF(timer, struct mb_display, timer);
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update_pins(disp, col_mask);
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}
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static struct mb_display display = {
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.timer = Z_TIMER_INITIALIZER(display.timer, show_row, clear_display),
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};
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static void start_scroll(struct mb_display *disp, s32_t duration)
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{
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/* Divide total duration by number of scrolling steps */
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if (duration) {
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disp->duration = duration / scroll_steps(disp);
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} else {
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disp->duration = SCROLL_DEFAULT_DURATION;
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}
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disp->scroll = SCROLL_START;
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disp->first = 1U;
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disp->cur_img = 0U;
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start_image(disp, get_font(' '));
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}
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static void start_single(struct mb_display *disp, s32_t duration)
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{
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disp->duration = duration;
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if (disp->text) {
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start_image(disp, get_font(disp->str[0]));
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} else {
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start_image(disp, disp->img);
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}
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}
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void mb_display_image(struct mb_display *disp, u32_t mode, s32_t duration,
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const struct mb_image *img, u8_t img_count)
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{
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reset_display(disp);
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__ASSERT(img && img_count > 0, "Invalid parameters");
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disp->text = 0U;
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disp->img_count = img_count;
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disp->img = img;
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disp->img_sep = 0U;
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disp->cur_img = 0U;
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disp->loop = !!(mode & MB_DISPLAY_FLAG_LOOP);
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switch (mode & MODE_MASK) {
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case MB_DISPLAY_MODE_DEFAULT:
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case MB_DISPLAY_MODE_SINGLE:
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start_single(disp, duration);
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break;
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case MB_DISPLAY_MODE_SCROLL:
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start_scroll(disp, duration);
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break;
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default:
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__ASSERT(0, "Invalid display mode");
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}
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}
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void mb_display_stop(struct mb_display *disp)
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{
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reset_display(disp);
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}
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void mb_display_print(struct mb_display *disp, u32_t mode,
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s32_t duration, const char *fmt, ...)
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{
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va_list ap;
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reset_display(disp);
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va_start(ap, fmt);
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vsnprintk(disp->str_buf, sizeof(disp->str_buf), fmt, ap);
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va_end(ap);
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if (disp->str_buf[0] == '\0') {
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return;
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}
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disp->str = disp->str_buf;
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disp->text = 1U;
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disp->img_sep = 1U;
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disp->cur_img = 0U;
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disp->loop = !!(mode & MB_DISPLAY_FLAG_LOOP);
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switch (mode & MODE_MASK) {
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case MB_DISPLAY_MODE_DEFAULT:
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case MB_DISPLAY_MODE_SCROLL:
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start_scroll(disp, duration);
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break;
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case MB_DISPLAY_MODE_SINGLE:
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start_single(disp, duration);
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break;
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default:
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__ASSERT(0, "Invalid display mode");
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}
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}
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struct mb_display *mb_display_get(void)
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{
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return &display;
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}
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static int mb_display_init(struct device *dev)
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{
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ARG_UNUSED(dev);
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display.dev = device_get_binding(DT_GPIO_P0_DEV_NAME);
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__ASSERT(dev, "No GPIO device found");
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gpio_pin_configure(display.dev, LED_ROW1_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_ROW2_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_ROW3_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL1_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL2_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL3_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL4_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL5_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL6_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL7_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL8_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_configure(display.dev, LED_COL9_GPIO_PIN, GPIO_OUTPUT);
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return 0;
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}
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SYS_INIT(mb_display_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
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