Michiel B.
This code will display two unsigned shorts (representing health & remaining ammo) on a TextLCD display. The mbed receives them via the USB HID interface.
Revision 0:36b4415952d0, committed 2011-12-11
- Comitter:
- mblokzijl
- Date:
- Sun Dec 11 19:14:27 2011 +0000
- Commit message:
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Sun Dec 11 19:14:27 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBDevice.lib Sun Dec 11 19:14:27 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/samux/code/USBDevice/#ef8c6751b185
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sun Dec 11 19:14:27 2011 +0000
@@ -0,0 +1,68 @@
+#include "mbed.h"
+#include "TextLCD.h"
+#include "USBHID.h"
+
+//for debugging
+Serial pc(USBTX, USBRX);
+
+//an LED to display activity
+DigitalOut hid_activity_led(LED2);
+DigitalOut alive_led(LED1);
+
+//The TextLCD
+TextLCD lcd(p21, p22, p17, p18, p19, p20); // rs, e, d4-d7
+
+//the mbed doesn't return the report ID.
+union hid_report_t {
+ uint8_t bytes[sizeof(int16_t)*2];
+ struct {
+ uint16_t health;
+ uint16_t ammo;
+ } data;
+};
+
+//We declare a USBHID device.
+// output report size = 1 (not needed here)
+// input report size matches the one defined above
+USBHID hid(sizeof(int16_t)*2, 1);
+
+//This report will contain data to be received
+HID_REPORT recv_report;
+
+int main() {
+ //initialise the LCD
+ lcd.printf(" CRYSIS\n Maximum mbed");
+ pc.printf("ready!\r\n");
+ uint16_t health, ammo;
+
+ while(1) {
+ if(hid.readNB(&recv_report)) {
+ pc.printf("recv[%d]: ", recv_report.length);
+ for(int i = 0; i < recv_report.length; i++) {
+ pc.printf("%d ", recv_report.data[i]);
+ }
+ pc.printf("\r\n");
+
+ //receive data
+ hid_report_t* pHidData = (hid_report_t*)(recv_report.data);
+
+ //for some reason, the byte order has been changed!
+ //negative number support will need sign extension
+ health = __REV16(pHidData->data.health);
+ ammo = __REV16(pHidData->data.ammo);
+
+ //for debugging...
+ //pc.printf("Health: %d, Ammo: %d\r\n", health, ammo);
+ //pc.printf("HEX: Health: %x, Ammo: %x\r\n", health, ammo);
+
+ //write new values on screen.
+ lcd.cls();
+ lcd.printf("Health: %d\nAmmo: %d", health, ammo);
+ hid_activity_led = hid_activity_led == 0 ? 1 : 0;//show HID activity
+ }
+
+ //toggle an LED to show us, that the mbed is alive.
+ wait(0.1);
+ alive_led = alive_led == 0 ? 1 : 0;
+ }
+}