main.cpp

00001 #include "mbed.h"
00002 
00003 Serial pc(USBTX, USBRX);
00004 
00005 static char serial_buffer[1024] = { 0 };
00006 static uint32_t serial_ix = 0;
00007 static bool serial_line_ready = false;
00008 static bool button_pressed = false;
00009 static uint32_t button_count = 0;
00010 
00011 static DigitalOut led(LED1);
00012 static InterruptIn btn(BUTTON1);
00013 
00014 void rx_irq() {
00015     char c = pc.getc();
00016 
00017     if (c == '\r') {
00018         serial_line_ready = true;
00019     }
00020     else if (c == '\n') {
00021         return;
00022     }
00023     else {
00024         serial_buffer[serial_ix] = c;
00025 
00026         serial_ix++;
00027     }
00028 
00029     if (serial_ix >= 1023) {
00030         memset(serial_buffer, 0, 1024);
00031         serial_ix = 0;
00032     }
00033 }
00034 
00035 void btn_irq() {
00036     button_pressed = true;
00037     button_count++;
00038 }
00039 
00040 int main() {
00041     pc.baud(115200);
00042     pc.printf("!Hello from proprietary serial device #1\r\n");
00043 
00044     pc.attach(callback(&rx_irq));
00045     btn.fall(callback(&btn_irq));
00046 
00047     while (1) {
00048         if (serial_line_ready) {
00049             if (strcmp(serial_buffer, "+LED1") == 0) {
00050                 led = 1;
00051                 printf(">%s\r\n!LED1 is now on\r\n", serial_buffer);
00052             }
00053             else if (strcmp(serial_buffer, "-LED1") == 0) {
00054                 led = 0;
00055                 printf(">%s\r\n!LED1 is now off\r\n", serial_buffer);
00056             }
00057             else {
00058                 printf(">%s\r\n!Unknown command\r\n", serial_buffer);
00059             }
00060 
00061             serial_line_ready = false;
00062             memset(serial_buffer, 0, 1024);
00063             serial_ix = 0;
00064         }
00065 
00066         if (button_pressed) {
00067             printf("<BTN=%lu\r\n", button_count);
00068             button_pressed = false;
00069         }
00070 
00071         wait_ms(1);
00072     }
00073 }