Jeronimo Avelar Filho
This program is a initial connection test of mBed and Texas Instruments EZ430 Chronos Watch. The Chronos RF Access Point radio dongle is connected to mBed usb port , and it's configured as a usb host. The program uses the USBHostSerial library.
Chronos Test
- This program is a successful connection test between mBed and the watch EZ430 Chronos Development Tool from texas Instruments.
- The RF Access Point usb dongle, that comes with the watch, emulates a usb serial port when connected to a PC. I connected it to the mBed usb port , configured as host ( two 10 K ohms resistors from D+,D- to gnd , I know the recommended value is 15k ) and based the development on the USBHostSerial HelloWorld example program.
- The mBed leds are activated based on the button received from the watch : led2 goes on when the "*" button is pressed , led3 when the "#" button is pressed and led4 when the "up"button is pressed .
- In order to function , you have to select the "ppt control" mode on the chronos watch and after that , start the transmission pressing the "down" button on the watch.
Diff: main.cpp
- Revision:
- 0:54aa44094993
- Child:
- 1:461ba80810ce
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Jul 30 02:07:46 2014 +0000
@@ -0,0 +1,84 @@
+#include "mbed.h"
+#include "USBHostSerial.h"
+
+DigitalOut led(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+Serial pc(USBTX, USBRX);
+int chronos_answer[10] ;
+
+void serial_task(void const*) {
+ USBHostSerial serial;
+
+
+ while(!serial.connect())
+ Thread::wait(500);
+
+ serial.baud(115200) ;
+
+ pc.printf("chronos init ...\n") ;
+
+ serial.putc(0xff) ;
+ serial.putc(0x07) ;
+ serial.putc(0x03) ;
+ pc.printf("chronos init completed ...\n") ;
+
+
+ while(1) {
+ while (1) {
+
+ // send read request to chronos
+ serial.putc(0xFF);
+ serial.putc(0x08);
+ serial.putc(0x07);
+ serial.putc(0x00);
+ serial.putc(0x00);
+ serial.putc(0x00);
+ serial.putc(0x00);
+ Thread::wait(15);
+
+
+ // put received characters on an array
+ int i = 0 ;
+ while (serial.available()) {
+ int c_in = serial.getc() ;
+ chronos_answer[i++] = c_in ;
+ }
+ int button = chronos_answer[3] ;
+ if(button != 255) {
+ printf("Button received : %d\n", button ) ;
+ switch(button) {
+ case 18 : // * button
+ led2 = 1 ;
+ led3 = 0 ;
+ led4 = 0 ;
+ break ;
+ case 50 : // up button
+ led2 = 0 ;
+ led3 = 1 ;
+ led4 = 0 ;
+ break ;
+ case 34 : // # button
+ led2 = 0 ;
+ led3 = 0 ;
+ led4 = 1 ;
+ break ;
+
+ }
+ }
+
+
+ Thread::wait(50);
+ }
+ }
+}
+
+int main() {
+ Thread serialTask(serial_task, NULL, osPriorityNormal, 256 * 4);
+ while(1) {
+ led=!led;
+ Thread::wait(500);
+ }
+}
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