Jeronimo Avelar Filho / Mbed 2 deprecated ChronosTest Featured

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.

Dependencies:   USBHost mbed

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.

/media/uploads/jeroavf/img_20140730_101232.jpg

  • 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.

main.cpp@0:54aa44094993, 2014-07-30 (annotated)

Committer:
jeroavf
Date:
Wed Jul 30 02:07:46 2014 +0000
Revision:
0:54aa44094993
Child:
1:461ba80810ce
Initial tests with TI Chronos Watch sending messages to mBed with  radio dongle connected to usb port of mbed configured as host

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jeroavf 0:54aa44094993 1 #include "mbed.h"
jeroavf 0:54aa44094993 2 #include "USBHostSerial.h"
jeroavf 0:54aa44094993 3
jeroavf 0:54aa44094993 4 DigitalOut led(LED1);
jeroavf 0:54aa44094993 5 DigitalOut led2(LED2);
jeroavf 0:54aa44094993 6 DigitalOut led3(LED3);
jeroavf 0:54aa44094993 7 DigitalOut led4(LED4);
jeroavf 0:54aa44094993 8
jeroavf 0:54aa44094993 9 Serial pc(USBTX, USBRX);
jeroavf 0:54aa44094993 10 int chronos_answer[10] ;
jeroavf 0:54aa44094993 11
jeroavf 0:54aa44094993 12 void serial_task(void const*) {
jeroavf 0:54aa44094993 13 USBHostSerial serial;
jeroavf 0:54aa44094993 14
jeroavf 0:54aa44094993 15
jeroavf 0:54aa44094993 16 while(!serial.connect())
jeroavf 0:54aa44094993 17 Thread::wait(500);
jeroavf 0:54aa44094993 18
jeroavf 0:54aa44094993 19 serial.baud(115200) ;
jeroavf 0:54aa44094993 20
jeroavf 0:54aa44094993 21 pc.printf("chronos init ...\n") ;
jeroavf 0:54aa44094993 22
jeroavf 0:54aa44094993 23 serial.putc(0xff) ;
jeroavf 0:54aa44094993 24 serial.putc(0x07) ;
jeroavf 0:54aa44094993 25 serial.putc(0x03) ;
jeroavf 0:54aa44094993 26 pc.printf("chronos init completed ...\n") ;
jeroavf 0:54aa44094993 27
jeroavf 0:54aa44094993 28
jeroavf 0:54aa44094993 29 while(1) {
jeroavf 0:54aa44094993 30 while (1) {
jeroavf 0:54aa44094993 31
jeroavf 0:54aa44094993 32 // send read request to chronos
jeroavf 0:54aa44094993 33 serial.putc(0xFF);
jeroavf 0:54aa44094993 34 serial.putc(0x08);
jeroavf 0:54aa44094993 35 serial.putc(0x07);
jeroavf 0:54aa44094993 36 serial.putc(0x00);
jeroavf 0:54aa44094993 37 serial.putc(0x00);
jeroavf 0:54aa44094993 38 serial.putc(0x00);
jeroavf 0:54aa44094993 39 serial.putc(0x00);
jeroavf 0:54aa44094993 40 Thread::wait(15);
jeroavf 0:54aa44094993 41
jeroavf 0:54aa44094993 42
jeroavf 0:54aa44094993 43 // put received characters on an array
jeroavf 0:54aa44094993 44 int i = 0 ;
jeroavf 0:54aa44094993 45 while (serial.available()) {
jeroavf 0:54aa44094993 46 int c_in = serial.getc() ;
jeroavf 0:54aa44094993 47 chronos_answer[i++] = c_in ;
jeroavf 0:54aa44094993 48 }
jeroavf 0:54aa44094993 49 int button = chronos_answer[3] ;
jeroavf 0:54aa44094993 50 if(button != 255) {
jeroavf 0:54aa44094993 51 printf("Button received : %d\n", button ) ;
jeroavf 0:54aa44094993 52 switch(button) {
jeroavf 0:54aa44094993 53 case 18 : // * button
jeroavf 0:54aa44094993 54 led2 = 1 ;
jeroavf 0:54aa44094993 55 led3 = 0 ;
jeroavf 0:54aa44094993 56 led4 = 0 ;
jeroavf 0:54aa44094993 57 break ;
jeroavf 0:54aa44094993 58 case 50 : // up button
jeroavf 0:54aa44094993 59 led2 = 0 ;
jeroavf 0:54aa44094993 60 led3 = 1 ;
jeroavf 0:54aa44094993 61 led4 = 0 ;
jeroavf 0:54aa44094993 62 break ;
jeroavf 0:54aa44094993 63 case 34 : // # button
jeroavf 0:54aa44094993 64 led2 = 0 ;
jeroavf 0:54aa44094993 65 led3 = 0 ;
jeroavf 0:54aa44094993 66 led4 = 1 ;
jeroavf 0:54aa44094993 67 break ;
jeroavf 0:54aa44094993 68
jeroavf 0:54aa44094993 69 }
jeroavf 0:54aa44094993 70 }
jeroavf 0:54aa44094993 71
jeroavf 0:54aa44094993 72
jeroavf 0:54aa44094993 73 Thread::wait(50);
jeroavf 0:54aa44094993 74 }
jeroavf 0:54aa44094993 75 }
jeroavf 0:54aa44094993 76 }
jeroavf 0:54aa44094993 77
jeroavf 0:54aa44094993 78 int main() {
jeroavf 0:54aa44094993 79 Thread serialTask(serial_task, NULL, osPriorityNormal, 256 * 4);
jeroavf 0:54aa44094993 80 while(1) {
jeroavf 0:54aa44094993 81 led=!led;
jeroavf 0:54aa44094993 82 Thread::wait(500);
jeroavf 0:54aa44094993 83 }
jeroavf 0:54aa44094993 84 }