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main.c
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/*-------------------------------------------------------------------------- *
* *
* *
* ____ _____ *
* / ___| ___ __ _ _ __ ___| ___| _ _ __ *
* \___ \ / __/ _` | '__/ __| |_ | | | | '_ \ *
* ___) | (_| (_| | | \__ \ _|| |_| | | | | *
* |____/ \___\__,_|_| |___/_| \__,_|_| |_| *
* *
* *
* 15/07/2019 *
* *
* *
* https://github.com/ScarsFun *
* littleVgl DEMO. *
* *
* LittleVgl (6.0) *
* Custom STM32F103RC Board (72Mhz, 64K ram, 256K Flash) . *
* ILI9341 display over SPI with DMA. rotary encoder. *
* KEIL RTX v5. *
* LVGL event driven refresh. Standby after 10 Secs Encoder inactivity. *
* *
* *
* *
* *
* ILI9341 SPI CONNECTIONS: *
* TFT_RESET PA2 *
* TFT_DC PA3 *
* TFT_CS PA4 *
* TFT_SCK PA5 *
* TFT_MISO PA6 *
* TFT_MOSI PA7 *
* *
* ROTARY ENCODER CONNECTIONS: *
* CLK PB7 *
* DT PB6 *
* SWITCH PB5 *
* *
* PWM LED PB0 *
* Blinky LED PB8 *
* *
* *
*---------------------------------------------------------------------------*/
#define osObjectsPublic // define objects in main module
#include <stdlib.h>
#include "cmsis_os2.h"
#include "stm32f10x.h"
#include "lvgl/lvgl.h"
#include "ili9341/core.h"
#include "ili9341/lv_driver.h"
#include "encoder/encoder.h"
#include "pwm/pwm.h"
#include "misc/led.h"
static lv_group_t* g; //An Object Group
static lv_indev_t* encoder_indev; //The input device
const uint32_t led_intensity[10] = { 1, 14, 68, 207, 490, 990, 1793, 2998, 4718, 70199 };
lv_obj_t* chart1, *slider, *spinbox;
lv_chart_series_t* dl2_1;
const osThreadAttr_t lvgl_refresh_Thread_attr = {
.stack_size = 1024 // Create the thread stack with a size of 1024 bytes
};
const osThreadAttr_t main_app_attr = {
.stack_size = 1280 // Create the thread stack with a size of 1024 bytes
};
void timer1_callback(void* param);
void lvgl_refresh_Thread(void* argument);
osThreadId_t T_lvgl_refresh_Thread;
osMutexId_t lvgl_upd_mutex;
osTimerId_t timer0_id, timer1_id;
osEventFlagsId_t LVGL_rfr_evt_id;
osStatus_t status;
void button_event_cb(lv_obj_t* btn, lv_event_t event)
{
// button is clicked
if (event == LV_EVENT_CLICKED) {
if (lv_btn_get_state(btn) == 0)
{
TIM3->CCR3 = 0;
lv_group_remove_obj(slider);
lv_obj_set_hidden(slider, true);
}
else {
TIM3->CCR3 = led_intensity[lv_slider_get_value(slider) - 1];
lv_group_add_obj(g, slider);
lv_obj_set_hidden(slider, false);
}
}
}
static void slider_event_cb(lv_obj_t* slider, lv_event_t event)
{
if (event == LV_EVENT_VALUE_CHANGED)
TIM3->CCR3 = led_intensity[lv_slider_get_value(slider) - 1];
}
static void checkb_event_cb(lv_obj_t* checkb, lv_event_t event)
{
if (event == LV_EVENT_CLICKED) //A check box is clicked
{
if (lv_cb_is_checked(checkb)) {
status = osTimerStart(timer0_id, 1000);
}
else
osTimerStop(timer0_id);
}
}
static void spinbox_event_cb(lv_obj_t* spinbox, lv_event_t event)
{
if (event == LV_EVENT_VALUE_CHANGED) {
uint16_t spinbox_value = lv_spinbox_get_value(spinbox);
if (spinbox_value == 0) {
osTimerStop(timer1_id);
GPIO_WriteBit(GPIOB, GPIO_Pin_8, Bit_RESET);
}
else {
osTimerStop(timer1_id);
osTimerStart(timer1_id, spinbox_value * 50);
}
}
}
static void gui_create(void)
{
lv_theme_t* th = lv_theme_zen_init(240, NULL);
lv_theme_set_current(th);
lv_obj_t* scr = lv_cont_create(NULL, NULL);
lv_scr_load(scr);
// Create Power toggle button
lv_obj_t* btn = lv_btn_create(lv_scr_act(), NULL);
lv_obj_set_size(btn, 30, 30);
lv_btn_set_toggle(btn, true);
lv_obj_set_event_cb(btn, button_event_cb);
lv_obj_t* btn_label = lv_label_create(btn, NULL);
lv_label_set_text(btn_label, LV_SYMBOL_POWER);
lv_group_add_obj(g, btn);
lv_obj_set_pos(btn, 15, 15);
//Create a slider
slider = lv_slider_create(lv_scr_act(), NULL);
lv_obj_set_size(slider, 120, 25);
lv_obj_set_event_cb(slider, slider_event_cb);
lv_obj_align(slider, btn, LV_ALIGN_OUT_RIGHT_TOP, 30, 5);
lv_bar_set_range(slider, 1, 10);
lv_obj_set_hidden(slider, true);
static lv_style_t spinBoxStyle;
lv_style_copy(&spinBoxStyle, th->style.spinbox.bg);
spinBoxStyle.text.font = &lv_font_roboto_28;
spinbox = lv_spinbox_create(lv_scr_act(), NULL);
lv_spinbox_set_style(spinbox, LV_SPINBOX_STYLE_BG, &spinBoxStyle);
lv_spinbox_set_digit_format(spinbox, 2, 0);
lv_spinbox_set_range(spinbox, 0, 99);
lv_obj_set_size(spinbox, 110, 55);
lv_obj_align(spinbox, slider, LV_ALIGN_OUT_RIGHT_TOP, 10, -10);
lv_obj_set_event_cb(spinbox, spinbox_event_cb);
lv_group_add_obj(g, spinbox);
lv_obj_t* checkb = lv_cb_create(lv_scr_act(), NULL); //check box
lv_cb_set_text(checkb, "GRAPH");
lv_group_add_obj(g, checkb); //Add to the group
lv_obj_set_event_cb(checkb, checkb_event_cb);
lv_obj_align(checkb, btn, LV_ALIGN_IN_BOTTOM_LEFT, 0, 40);
lv_obj_t* label = lv_label_create(lv_scr_act(), NULL);
lv_label_set_text(label, "LittleVgl V6.0");
lv_obj_align(label, checkb, LV_ALIGN_IN_BOTTOM_LEFT, 90, 15);
chart1 = lv_chart_create(lv_scr_act(), NULL);
lv_obj_set_size(chart1, 310, 130);
lv_obj_set_pos(chart1, 4, 100);
lv_chart_set_series_width(chart1, 2);
lv_chart_set_type(chart1, LV_CHART_TYPE_POINT | LV_CHART_TYPE_LINE);
lv_chart_set_range(chart1, 0, 120);
lv_chart_set_div_line_count(chart1, 4, 0);
dl2_1 = lv_chart_add_series(chart1, LV_COLOR_RED);
lv_group_set_wrap(g, true);
}
void timer1_callback(void* param)
{
lv_chart_set_next(chart1, dl2_1, rand() % 120);
lv_chart_refresh(chart1);
osEventFlagsSet(LVGL_rfr_evt_id, 0x0001);
}
void timer2_callback(void* param)
{
GPIOB->ODR ^= (1 << 8); //toggle PB8 LED
}
// LVGL refresh thread , Standby after 10secs rotary encoder inactivity
void lvgl_refresh_Thread(void* argument)
{
uint32_t index;
for (;;) {
osEventFlagsWait(LVGL_rfr_evt_id, 0x0001, NULL, osWaitForever);
osMutexAcquire(lvgl_upd_mutex, osWaitForever);
for (index = 0; index < 1000; index++) {
lv_task_handler();
lv_tick_inc(10);
osDelay(10);
}
osMutexRelease(lvgl_upd_mutex);
}
}
void app_main(void* argument)
{
lv_init();
ILI9341_init();
PWM_Init();
LED_PB8_init();
static lv_disp_buf_t disp_buf;
static lv_color_t buf_1[LV_HOR_RES_MAX * 10];
lv_disp_buf_init(&disp_buf, buf_1, NULL, LV_HOR_RES_MAX * 10);
lv_disp_drv_t disp_drv;
lv_disp_drv_init(&disp_drv);
disp_drv.buffer = &disp_buf;
disp_drv.flush_cb = ILI9341_flush;
lv_disp_drv_register(&disp_drv);
encoder_init();
lv_indev_drv_t indev_drv;
lv_indev_drv_init(&indev_drv);
indev_drv.type = LV_INDEV_TYPE_ENCODER;
indev_drv.read_cb = encoder_read;
encoder_indev = lv_indev_drv_register(&indev_drv);
g = lv_group_create();
lv_indev_set_group(encoder_indev, g);
gui_create();
lvgl_upd_mutex = osMutexNew(NULL);
LVGL_rfr_evt_id = osEventFlagsNew(NULL);
timer0_id = osTimerNew(timer1_callback, osTimerPeriodic, (void*)0, NULL);
timer1_id = osTimerNew(timer2_callback, osTimerPeriodic, (void*)0, NULL);
T_lvgl_refresh_Thread = osThreadNew(lvgl_refresh_Thread, NULL, &lvgl_refresh_Thread_attr);
osEventFlagsSet(LVGL_rfr_evt_id, 0x0001);
for (;;) {
}
}
int main(void)
{
// System Initialization
SystemCoreClockUpdate();
osKernelInitialize(); // Initialize CMSIS-RTOS
osThreadNew(app_main, NULL, &main_app_attr); // Create application main thread
osKernelStart(); // Start thread execution
for (;;) {
}
}