Felipe Neves
/
lpc4337_mbed_os_thread_demo
Threading of mbed os running in LPC4337 xplorer kit
main.cpp@0:da8a31f3e0f7, 2016-09-26 (annotated)
- Committer:
- uLipe
- Date:
- Mon Sep 26 21:14:47 2016 +0000
- Revision:
- 0:da8a31f3e0f7
First commit: initial implementation
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
uLipe | 0:da8a31f3e0f7 | 1 | /** |
uLipe | 0:da8a31f3e0f7 | 2 | * @brief Simple threading using the mbed os demo |
uLipe | 0:da8a31f3e0f7 | 3 | */ |
uLipe | 0:da8a31f3e0f7 | 4 | #include "mbed.h" |
uLipe | 0:da8a31f3e0f7 | 5 | #include "rtos.h" |
uLipe | 0:da8a31f3e0f7 | 6 | #include "ST7567.h" |
uLipe | 0:da8a31f3e0f7 | 7 | |
uLipe | 0:da8a31f3e0f7 | 8 | /* LCD and font parameters */ |
uLipe | 0:da8a31f3e0f7 | 9 | #define LCD_HEIGHT 64 |
uLipe | 0:da8a31f3e0f7 | 10 | #define LCD_WIDTH 128 |
uLipe | 0:da8a31f3e0f7 | 11 | #define FONT_HEIGHT 10 |
uLipe | 0:da8a31f3e0f7 | 12 | #define FONT_WIDTH 5 |
uLipe | 0:da8a31f3e0f7 | 13 | |
uLipe | 0:da8a31f3e0f7 | 14 | |
uLipe | 0:da8a31f3e0f7 | 15 | /* allocate statically stacks for the three threads */ |
uLipe | 0:da8a31f3e0f7 | 16 | unsigned char rt_stk[1024]; |
uLipe | 0:da8a31f3e0f7 | 17 | unsigned char hp_stk[1024]; |
uLipe | 0:da8a31f3e0f7 | 18 | unsigned char lp_stk[1024]; |
uLipe | 0:da8a31f3e0f7 | 19 | |
uLipe | 0:da8a31f3e0f7 | 20 | /* creates three tread objects with different priorities */ |
uLipe | 0:da8a31f3e0f7 | 21 | Thread real_time_thread(osPriorityRealtime, 1024, &rt_stk[0]); |
uLipe | 0:da8a31f3e0f7 | 22 | Thread high_prio_thread(osPriorityHigh, 1024, &hp_stk[0]); |
uLipe | 0:da8a31f3e0f7 | 23 | Thread low_prio_thread(osPriorityNormal, 1024, &lp_stk[0]); |
uLipe | 0:da8a31f3e0f7 | 24 | |
uLipe | 0:da8a31f3e0f7 | 25 | |
uLipe | 0:da8a31f3e0f7 | 26 | /* create a semaphore to synchronize the threads */ |
uLipe | 0:da8a31f3e0f7 | 27 | Semaphore sync_sema; |
uLipe | 0:da8a31f3e0f7 | 28 | |
uLipe | 0:da8a31f3e0f7 | 29 | /* creates a instance of display */ |
uLipe | 0:da8a31f3e0f7 | 30 | ST7567 disp(D11, D13, D12, D9, D10); |
uLipe | 0:da8a31f3e0f7 | 31 | |
uLipe | 0:da8a31f3e0f7 | 32 | |
uLipe | 0:da8a31f3e0f7 | 33 | |
uLipe | 0:da8a31f3e0f7 | 34 | |
uLipe | 0:da8a31f3e0f7 | 35 | /** |
uLipe | 0:da8a31f3e0f7 | 36 | * @brief real time prio task function |
uLipe | 0:da8a31f3e0f7 | 37 | */ |
uLipe | 0:da8a31f3e0f7 | 38 | static void rt_task(void) { |
uLipe | 0:da8a31f3e0f7 | 39 | const char rt_message[] = {"Real time prio Task: \0"}; |
uLipe | 0:da8a31f3e0f7 | 40 | |
uLipe | 0:da8a31f3e0f7 | 41 | disp.locate(0, FONT_HEIGHT * 2); |
uLipe | 0:da8a31f3e0f7 | 42 | |
uLipe | 0:da8a31f3e0f7 | 43 | disp.printf(rt_message); |
uLipe | 0:da8a31f3e0f7 | 44 | |
uLipe | 0:da8a31f3e0f7 | 45 | for(;;) { |
uLipe | 0:da8a31f3e0f7 | 46 | |
uLipe | 0:da8a31f3e0f7 | 47 | /* take the semaphore allowing less priority |
uLipe | 0:da8a31f3e0f7 | 48 | * tasks to run |
uLipe | 0:da8a31f3e0f7 | 49 | */ |
uLipe | 0:da8a31f3e0f7 | 50 | disp.locate(LCD_WIDTH - (sizeof(rt_message) * FONT_WIDTH), FONT_HEIGHT * 2); |
uLipe | 0:da8a31f3e0f7 | 51 | disp.printf("WAIT!"); |
uLipe | 0:da8a31f3e0f7 | 52 | sync_sema.wait(0); |
uLipe | 0:da8a31f3e0f7 | 53 | |
uLipe | 0:da8a31f3e0f7 | 54 | /* show the message by 1 second */ |
uLipe | 0:da8a31f3e0f7 | 55 | disp.locate(LCD_WIDTH - (sizeof(rt_message) * FONT_WIDTH), FONT_HEIGHT * 2); |
uLipe | 0:da8a31f3e0f7 | 56 | disp.printf("EXEC!"); |
uLipe | 0:da8a31f3e0f7 | 57 | |
uLipe | 0:da8a31f3e0f7 | 58 | disp.locate(LCD_WIDTH - (sizeof(rt_message) * FONT_WIDTH), FONT_HEIGHT * 2); |
uLipe | 0:da8a31f3e0f7 | 59 | disp.printf("DELAY"); |
uLipe | 0:da8a31f3e0f7 | 60 | Thread::wait(50); |
uLipe | 0:da8a31f3e0f7 | 61 | |
uLipe | 0:da8a31f3e0f7 | 62 | } |
uLipe | 0:da8a31f3e0f7 | 63 | |
uLipe | 0:da8a31f3e0f7 | 64 | } |
uLipe | 0:da8a31f3e0f7 | 65 | |
uLipe | 0:da8a31f3e0f7 | 66 | /** |
uLipe | 0:da8a31f3e0f7 | 67 | * @brief high prio task function |
uLipe | 0:da8a31f3e0f7 | 68 | */ |
uLipe | 0:da8a31f3e0f7 | 69 | static void hp_task(void){ |
uLipe | 0:da8a31f3e0f7 | 70 | const char hp_message[] = {"High priority Task: \0"}; |
uLipe | 0:da8a31f3e0f7 | 71 | |
uLipe | 0:da8a31f3e0f7 | 72 | disp.locate(0, FONT_HEIGHT * 3); |
uLipe | 0:da8a31f3e0f7 | 73 | disp.printf(hp_message); |
uLipe | 0:da8a31f3e0f7 | 74 | |
uLipe | 0:da8a31f3e0f7 | 75 | for(;;) { |
uLipe | 0:da8a31f3e0f7 | 76 | /* take the semaphore allowing less priority |
uLipe | 0:da8a31f3e0f7 | 77 | * tasks to run |
uLipe | 0:da8a31f3e0f7 | 78 | */ |
uLipe | 0:da8a31f3e0f7 | 79 | disp.locate(LCD_WIDTH - (sizeof(hp_message) * FONT_WIDTH), FONT_HEIGHT * 3); |
uLipe | 0:da8a31f3e0f7 | 80 | disp.printf("WAIT!"); |
uLipe | 0:da8a31f3e0f7 | 81 | sync_sema.wait(0); |
uLipe | 0:da8a31f3e0f7 | 82 | |
uLipe | 0:da8a31f3e0f7 | 83 | /* show the message by 1 second */ |
uLipe | 0:da8a31f3e0f7 | 84 | disp.locate(LCD_WIDTH - (sizeof(hp_message) * FONT_WIDTH), FONT_HEIGHT * 3); |
uLipe | 0:da8a31f3e0f7 | 85 | disp.printf("EXEC!"); |
uLipe | 0:da8a31f3e0f7 | 86 | |
uLipe | 0:da8a31f3e0f7 | 87 | disp.locate(LCD_WIDTH - (sizeof(hp_message) * FONT_WIDTH), FONT_HEIGHT * 3); |
uLipe | 0:da8a31f3e0f7 | 88 | disp.printf("DELAY"); |
uLipe | 0:da8a31f3e0f7 | 89 | Thread::wait(50); |
uLipe | 0:da8a31f3e0f7 | 90 | |
uLipe | 0:da8a31f3e0f7 | 91 | } |
uLipe | 0:da8a31f3e0f7 | 92 | } |
uLipe | 0:da8a31f3e0f7 | 93 | |
uLipe | 0:da8a31f3e0f7 | 94 | /** |
uLipe | 0:da8a31f3e0f7 | 95 | * @brief normal prio task function |
uLipe | 0:da8a31f3e0f7 | 96 | */ |
uLipe | 0:da8a31f3e0f7 | 97 | static void np_task(void) { |
uLipe | 0:da8a31f3e0f7 | 98 | |
uLipe | 0:da8a31f3e0f7 | 99 | const char lp_message[] = {"Low priority Task: \0"}; |
uLipe | 0:da8a31f3e0f7 | 100 | |
uLipe | 0:da8a31f3e0f7 | 101 | disp.locate(0, FONT_HEIGHT * 4); |
uLipe | 0:da8a31f3e0f7 | 102 | disp.printf(lp_message); |
uLipe | 0:da8a31f3e0f7 | 103 | |
uLipe | 0:da8a31f3e0f7 | 104 | |
uLipe | 0:da8a31f3e0f7 | 105 | for(;;) { |
uLipe | 0:da8a31f3e0f7 | 106 | /* show the message by 1 second */ |
uLipe | 0:da8a31f3e0f7 | 107 | disp.locate(LCD_WIDTH - (sizeof(lp_message) * FONT_WIDTH), FONT_HEIGHT * 4); |
uLipe | 0:da8a31f3e0f7 | 108 | disp.printf("EXEC!"); |
uLipe | 0:da8a31f3e0f7 | 109 | |
uLipe | 0:da8a31f3e0f7 | 110 | disp.locate(LCD_WIDTH - (sizeof(lp_message) * FONT_WIDTH), FONT_HEIGHT * 4); |
uLipe | 0:da8a31f3e0f7 | 111 | disp.printf("DELAY"); |
uLipe | 0:da8a31f3e0f7 | 112 | Thread::wait(50); |
uLipe | 0:da8a31f3e0f7 | 113 | |
uLipe | 0:da8a31f3e0f7 | 114 | /* release the semaphore and syncrhonize the tasks */ |
uLipe | 0:da8a31f3e0f7 | 115 | disp.locate(LCD_WIDTH - (sizeof(lp_message) * FONT_WIDTH), FONT_HEIGHT * 4); |
uLipe | 0:da8a31f3e0f7 | 116 | disp.printf("WAIT!"); |
uLipe | 0:da8a31f3e0f7 | 117 | sync_sema.release(); |
uLipe | 0:da8a31f3e0f7 | 118 | |
uLipe | 0:da8a31f3e0f7 | 119 | } |
uLipe | 0:da8a31f3e0f7 | 120 | } |
uLipe | 0:da8a31f3e0f7 | 121 | |
uLipe | 0:da8a31f3e0f7 | 122 | /** |
uLipe | 0:da8a31f3e0f7 | 123 | * @brief main loop |
uLipe | 0:da8a31f3e0f7 | 124 | */ |
uLipe | 0:da8a31f3e0f7 | 125 | int main(void) { |
uLipe | 0:da8a31f3e0f7 | 126 | const char banner[] = {"Embarcados MBED-OS Thread demo\0"}; |
uLipe | 0:da8a31f3e0f7 | 127 | |
uLipe | 0:da8a31f3e0f7 | 128 | /* configures the display */ |
uLipe | 0:da8a31f3e0f7 | 129 | disp.cls(); |
uLipe | 0:da8a31f3e0f7 | 130 | disp.set_contrast(0x35); |
uLipe | 0:da8a31f3e0f7 | 131 | disp.locate((LCD_WIDTH - (sizeof(banner) * FONT_WIDTH)) / 2, 0); |
uLipe | 0:da8a31f3e0f7 | 132 | disp.printf(banner); |
uLipe | 0:da8a31f3e0f7 | 133 | |
uLipe | 0:da8a31f3e0f7 | 134 | |
uLipe | 0:da8a31f3e0f7 | 135 | /* starts the three tasks */ |
uLipe | 0:da8a31f3e0f7 | 136 | real_time_thread.start(rt_task); |
uLipe | 0:da8a31f3e0f7 | 137 | high_prio_thread.start(hp_task); |
uLipe | 0:da8a31f3e0f7 | 138 | low_prio_thread.start(np_task); |
uLipe | 0:da8a31f3e0f7 | 139 | |
uLipe | 0:da8a31f3e0f7 | 140 | |
uLipe | 0:da8a31f3e0f7 | 141 | return 0; |
uLipe | 0:da8a31f3e0f7 | 142 | } |
uLipe | 0:da8a31f3e0f7 | 143 |