Juan Angel García
/
7_9
UART
main.cpp
- Committer:
- jangelgm
- Date:
- 2017-03-07
- Revision:
- 0:4ec99b800425
File content as of revision 0:4ec99b800425:
/*Program Example 7.9: Sets the mbed up for async communication, and exchanges data with a similar node, sending its own switch positions, and displaying those of the other. */ #include "mbed.h" Serial async_port(p9, p10); //set up TX and RX on pins 9 and 10 DigitalOut red_led(p25); //red led DigitalOut green_led(p26); //green led DigitalOut strobe(p7); //a strobe to trigger the scope DigitalIn switch_ip1(p5); DigitalIn switch_ip2(p6); char switch_word ; //the word we will send char recd_val; //the received value int main() { async_port.baud(9600); //set baud rate to 9600 (ie default) //accept default format, of 8 bits, no parity while (1) { //Set up the word to be sent, by testing switch inputs switch_word=0xa0; //set up a recognizable output pattern if (switch_ip1==1) switch_word=switch_word | 0x01; //OR in lsb if (switch_ip2==1) switch_word=switch_word | 0x02; //OR in next lsb strobe =1; //short strobe pulse wait_us(10); strobe=0; async_port.putc(switch_word); //transmit switch_word if (async_port.readable()==1) //is there a character to be read? recd_val=async_port.getc(); //if yes, then read it red_led=0; //preset both to 0 green_led=0; recd_val=recd_val & 0x03; //AND out unwanted bits if (recd_val==1) red_led=1; if (recd_val==2) green_led=1; if (recd_val==3) { red_led=1; green_led=1; } } }