/**
* \brief Graph task
*
* This task runs in the background to draw a pseudo-random graph to a dedicated
* display buffer. If the user selects a different screen than the graph, it
* will continue to update even though it is not visible until the graph screen
* is selected again.
*
* \param params Parameters for the task. (Not used.)
*/
static void graph_task(void *params)
{
gfx_coord_t x, y, old_y;
uint8_t current_value;
EventBits_t event_bits;
const TickType_t ticks_to_wait = 10 / portTICK_PERIOD_MS;
x = 0;
current_value = graph_noise;
for(;;) {
/* Wait a maximum of 10ms for either bit 0 or bit 1 to be set within
the event group. Not clear the bits before exiting. */
event_bits = xEventGroupWaitBits(
event_group, /* The event group being tested. */
EVENT_DISPLAY_INIT | EVENT_DISPLAY_GRAPH, /* The bits within the event group to wait for. */
pdFALSE, /* Bit should not be cleared before returning. */
pdFALSE, /* Don't wait for both bits, either bit will do. */
ticks_to_wait);/* Wait a maximum of 10ms for either bit to be set. */
if((event_bits & EVENT_DISPLAY_INIT) ||
(event_bits & EVENT_DISPLAY_GRAPH)) {
oled1_set_led_state(&oled1, OLED1_LED1_ID, true);
// Compute new noise sample and value of current graph sample
graph_noise = (graph_noise * 173) + 1;
current_value = ((uint16_t)graph_noise + current_value) / 2;
xSemaphoreTake(display_mutex, portMAX_DELAY);
// Scale graph value so it fits within the canvas
y = CANVAS_GRAPH_Y_OFFSET
+ ((uint16_t)CANVAS_HEIGHT * current_value) / 256;
// Clear previous graph point..
gfx_mono_draw_vertical_line(x, CANVAS_GRAPH_Y_OFFSET, CANVAS_HEIGHT,
GFX_PIXEL_CLR);
// ..and draw a continuous graph using lines
if (x == 0) {
gfx_mono_draw_pixel(x, y, GFX_PIXEL_SET);
} else {
gfx_mono_draw_line(x - 1, old_y, x, y, GFX_PIXEL_SET);
}
xSemaphoreGive(display_mutex);
old_y = y;
if (++x >= CANVAS_WIDTH) {
x = 0;
}
oled1_set_led_state(&oled1, OLED1_LED1_ID, false);
}
vTaskDelay(GRAPH_TASK_DELAY);
}
}
int main(void){
struct gfx_mono_bitmap smiley;
struct gfx_mono_bitmap smiley_flash;
board_init();
sysclk_init();
/* Initialize GFX lib. Will configure the display controller and
* create a framebuffer in RAM if the controller lack two-way communication
*/
gfx_mono_init();
// Setup bitmap struct for bitmap stored in RAM
smiley.type = GFX_MONO_BITMAP_RAM;
smiley.width = 8;
smiley.height = 16;
smiley.data.pixmap = smiley_data;
// Setup bitmap for bitmap stored in FLASH
smiley_flash.type = GFX_MONO_BITMAP_PROGMEM;
smiley_flash.width = 8;
smiley_flash.height = 16;
smiley_flash.data.progmem = flash_bitmap;
// Output bitmaps to display
gfx_mono_put_bitmap(&smiley, 50, 0);
gfx_mono_put_bitmap(&smiley_flash, 0, 0);
//Draw horizontal an vertical lines with length 128 and 32 pixels
gfx_mono_draw_vertical_line(1, 0, 32, GFX_PIXEL_SET);
gfx_mono_draw_horizontal_line(0, 2, 128, GFX_PIXEL_SET);
// Draw a line from the top-left corner to the bottom right corner
gfx_mono_draw_line(0, 0, 127, 31, GFX_PIXEL_SET);
// Draw a rectangle with upper left corner at x=20,y=10 - width=height=10px
gfx_mono_draw_rect(20, 10, 10, 10,GFX_PIXEL_SET);
// Draw a 10x10 filled rectangle at x=10,y=10
gfx_mono_draw_filled_rect(10, 10, 10, 10, GFX_PIXEL_SET);
// Draw a whole circle at x=50,y=16 with radios=8 and all octants drawn
gfx_mono_draw_circle(50, 16, 8, GFX_PIXEL_SET,GFX_WHOLE);
// Draw a filled circle with all quadrant drawn
gfx_mono_draw_filled_circle(80, 16, 10, GFX_PIXEL_SET, GFX_WHOLE);
while(true) {
// This while left intentionally blank to halt execution.
}
}
/**
* \brief Graph task
*
* This task runs in the background to draw a pseudo-random graph to a dedicated
* display buffer. If the user selects a different screen than the graph, it
* will continue to update even though it is not visible until the graph screen
* is selected again.
*
* \param params Parameters for the task. (Not used.)
*/
static void graph_task(void *params)
{
gfx_coord_t x, y, old_y;
uint8_t current_value;
x = 0;
current_value = graph_noise;
for(;;) {
oled1_set_led_state(&oled1, OLED1_LED1_ID, true);
// Compute new noise sample and value of current graph sample
graph_noise = (graph_noise * 173) + 1;
current_value = ((uint16_t)graph_noise + current_value) / 2;
xSemaphoreTake(display_mutex, portMAX_DELAY);
// Scale graph value so it fits within the canvas
y = CANVAS_GRAPH_Y_OFFSET
+ ((uint16_t)CANVAS_HEIGHT * current_value) / 256;
// Clear previous graph point..
gfx_mono_draw_vertical_line(x, CANVAS_GRAPH_Y_OFFSET, CANVAS_HEIGHT,
GFX_PIXEL_CLR);
// ..and draw a continuous graph using lines
if (x == 0) {
gfx_mono_draw_pixel(x, y, GFX_PIXEL_SET);
} else {
gfx_mono_draw_line(x - 1, old_y, x, y, GFX_PIXEL_SET);
}
xSemaphoreGive(display_mutex);
old_y = y;
if (++x >= CANVAS_WIDTH) {
x = 0;
}
oled1_set_led_state(&oled1, OLED1_LED1_ID, false);
vTaskDelay(GRAPH_TASK_DELAY);
}
}
/**
* \internal
* \brief Test drawing a vertical line
*
* This test draws a vertical line and checks that this is done.
*
* \param test Current test case.
*/
static void run_draw_vertical_line_test(const struct test_case *test)
{
uint8_t actual[GFX_MONO_LCD_WIDTH];
uint8_t expected_page1[GFX_MONO_LCD_WIDTH];
uint8_t expected_page2[GFX_MONO_LCD_WIDTH];
uint8_t expected_empty[GFX_MONO_LCD_WIDTH];
uint8_t page;
// Clear entire display
gfx_mono_draw_filled_rect(0, 0, GFX_MONO_LCD_WIDTH, GFX_MONO_LCD_HEIGHT,
GFX_PIXEL_CLR);
// Fill page buffer holding the top of the line
set_buffer(expected_page1, 0x00);
expected_page1[4] = 0xFC;
// Fill page buffer holding the bottom of the line
set_buffer(expected_page2, 0x00);
expected_page2[4] = 0x1F;
// Fill empty page buffer
set_buffer(expected_empty, 0x00);
// Draw a vertical line at position 4, 2 with length 11
gfx_mono_draw_vertical_line(4, 2, 11, GFX_PIXEL_SET);
// Get all pages from display and check that the line is drawn
for (page = 0; page < GFX_MONO_LCD_PAGES; page++) {
gfx_mono_get_page(actual, page, 0, GFX_MONO_LCD_WIDTH);
if (page == 0) {
test_assert_true(test, is_page_correct(actual, expected_page1),
"Page %d with line not matching expected page",
page);
} else if (page == 1) {
test_assert_true(test, is_page_correct(actual, expected_page2),
"Page %d with line not matching expected page",
page);
} else {
test_assert_true(test, is_page_correct(actual, expected_empty),
"Empty page %d not matching expected page", page);
}
}
}
/**
* \brief Main demo task
*
* This task keeps track of which screen the user has selected, which tasks
* to resume/suspend to draw the selected screen, and also draws the menu bar.
*
* The menu bar shows which screens the user can select by clicking the
* corresponding buttons on the OLED1 Xplained Pro:
* - \ref graph_task() "graph" (selected at start-up)
* - \ref terminal_task() "term."
* - \ref about_task() "about"
*
* \param params Parameters for the task. (Not used.)
*/
static void main_task(void *params)
{
bool graph_buffer_initialized = false;
bool selection_changed = true;
bool select_graph_buffer;
enum menu_items current_selection = MENU_ITEM_GRAPH;
gfx_coord_t x, y, display_y_offset;
xTaskHandle temp_task_handle = NULL;
for(;;) {
// Show that task is executing
oled1_set_led_state(&oled1, OLED1_LED3_ID, true);
// Check buttons to see if user changed the selection
if (oled1_get_button_state(&oled1, OLED1_BUTTON1_ID)
&& (current_selection != MENU_ITEM_GRAPH)) {
current_selection = MENU_ITEM_GRAPH;
selection_changed = true;
} else if (oled1_get_button_state(&oled1, OLED1_BUTTON2_ID)
&& (current_selection != MENU_ITEM_TERMINAL)) {
current_selection = MENU_ITEM_TERMINAL;
selection_changed = true;
} else if (oled1_get_button_state(&oled1, OLED1_BUTTON3_ID)
&& (current_selection != MENU_ITEM_ABOUT)) {
current_selection = MENU_ITEM_ABOUT;
selection_changed = true;
}
// If selection changed, handle the selection
if (selection_changed) {
// Wait for and take the display semaphore before doing any changes.
xSemaphoreTake(display_mutex, portMAX_DELAY);
// We can now safely suspend the previously resumed task
if (temp_task_handle) {
vTaskSuspend(temp_task_handle);
temp_task_handle = NULL;
}
// Select the new drawing task and corresponding display buffer
switch (current_selection) {
case MENU_ITEM_GRAPH:
// Graph task runs continuously, no need to set task handle
select_graph_buffer = true;
break;
case MENU_ITEM_TERMINAL:
temp_task_handle = terminal_task_handle;
select_graph_buffer = false;
break;
default:
case MENU_ITEM_ABOUT:
temp_task_handle = about_task_handle;
select_graph_buffer = false;
}
// Select and initialize display buffer to use.
display_y_offset = select_graph_buffer ? CANVAS_GRAPH_Y_OFFSET : 0;
// Draw the menu bar (only needs to be done once for graph)
if (!select_graph_buffer || !graph_buffer_initialized) {
// Clear the selected display buffer first
gfx_mono_draw_filled_rect(0, display_y_offset,
GFX_MONO_LCD_WIDTH, GFX_MONO_LCD_HEIGHT / 2,
GFX_PIXEL_CLR);
// Draw menu lines, each item with height MENU_HEIGHT pixels
y = display_y_offset + CANVAS_HEIGHT;
gfx_mono_draw_horizontal_line(0, y, GFX_MONO_LCD_WIDTH,
GFX_PIXEL_SET);
x = MENU_ITEM_WIDTH;
y++;
for (uint8_t i = 0; i < (MENU_NUM_ITEMS - 1); i++) {
gfx_mono_draw_vertical_line(x, y, MENU_HEIGHT,
GFX_PIXEL_SET);
x += 1 + MENU_ITEM_WIDTH;
}
// Highlight the current selection
gfx_mono_draw_rect(current_selection * (1 + MENU_ITEM_WIDTH), y,
MENU_ITEM_WIDTH, MENU_HEIGHT, GFX_PIXEL_SET);
// Draw the menu item text
x = (MENU_ITEM_WIDTH / 2) - ((5 * SYSFONT_WIDTH) / 2);
y += (MENU_HEIGHT / 2) - (SYSFONT_HEIGHT / 2);
for (uint8_t i = 0; i < MENU_NUM_ITEMS; i++) {
gfx_mono_draw_string(menu_items_text[i], x, y, &sysfont);
x += 1 + MENU_ITEM_WIDTH;
}
graph_buffer_initialized = true;
}
// Set display controller to output the new buffer
ssd1306_set_display_start_line_address(display_y_offset);
// We are done modifying the display, so give back the mutex
xSemaphoreGive(display_mutex);
selection_changed = false;
// If a task handle was specified, resume it now
if (temp_task_handle) {
vTaskResume(temp_task_handle);
}
}
// Show that task is done
oled1_set_led_state(&oled1, OLED1_LED3_ID, false);
vTaskDelay(MAIN_TASK_DELAY);
}
}
