Curtis Mulady / XMIT_IR

library for implementing ir transmission

XMIT_IR.cpp@1:ae1d2167a10c, 2012-10-06 (annotated)

Committer:
cmulady
Date:
Sat Oct 06 01:44:32 2012 +0000
Revision:
1:ae1d2167a10c
Parent:
0:556f9be6047d
Child:
2:2eb0a3a29b5b
doesnt work!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cmulady 0:556f9be6047d 1 #include "mbed.h"
cmulady 0:556f9be6047d 2 #include "XMIT_IR.h"
cmulady 0:556f9be6047d 3
cmulady 0:556f9be6047d 4
cmulady 0:556f9be6047d 5
cmulady 1:ae1d2167a10c 6 IRTransmitter::IRTransmitter(PinName TX, PinName PWM, PinName RX, int data_buff_len, void (*fptr)(void))
cmulady 0:556f9be6047d 7 {
cmulady 1:ae1d2167a10c 8 ir_serial = new Serial(TX,RX);
cmulady 1:ae1d2167a10c 9 ir_pwm = new PwmOut(PWM);
cmulady 1:ae1d2167a10c 10 data_buffer_out = new char(data_buff_len);
cmulady 1:ae1d2167a10c 11 data_buffer_in = new char(data_buff_len+2);
cmulady 0:556f9be6047d 12
cmulady 1:ae1d2167a10c 13 //Initialize modules
cmulady 1:ae1d2167a10c 14 (*ir_pwm).period(1.0/38000.0); //38kHz Modulation Freq
cmulady 1:ae1d2167a10c 15 (*ir_pwm) = 0.5; //pulse width = 50%
cmulady 1:ae1d2167a10c 16 (*ir_serial).baud(2400);
cmulady 1:ae1d2167a10c 17 (*ir_serial).attach(fptr,Serial::RxIrq);
cmulady 1:ae1d2167a10c 18 }
cmulady 1:ae1d2167a10c 19
cmulady 1:ae1d2167a10c 20 IRTransmitter::~IRTransmitter()
cmulady 1:ae1d2167a10c 21 {
cmulady 1:ae1d2167a10c 22 delete ir_serial;
cmulady 1:ae1d2167a10c 23 delete ir_pwm;
cmulady 1:ae1d2167a10c 24 delete data_buffer_out;
cmulady 1:ae1d2167a10c 25 delete data_buffer_in;
cmulady 0:556f9be6047d 26 }
cmulady 0:556f9be6047d 27
cmulady 1:ae1d2167a10c 28
cmulady 1:ae1d2167a10c 29 void IRTransmitter::MakePacket(char* data,int len)
cmulady 1:ae1d2167a10c 30 {
cmulady 1:ae1d2167a10c 31 char check =0x0;
cmulady 1:ae1d2167a10c 32 (*ir_serial).putc(ASCII_STX);
cmulady 1:ae1d2167a10c 33 for(int i=0; i<len; i++) {
cmulady 1:ae1d2167a10c 34 check^=data[i];
cmulady 1:ae1d2167a10c 35 (*ir_serial).putc(data[i]);
cmulady 1:ae1d2167a10c 36 }
cmulady 1:ae1d2167a10c 37 (*ir_serial).putc(check);
cmulady 1:ae1d2167a10c 38 (*ir_serial).putc(ASCII_ETX);
cmulady 1:ae1d2167a10c 39 }
cmulady 1:ae1d2167a10c 40
cmulady 1:ae1d2167a10c 41 char IRTransmitter::ReadPacket(char* data)
cmulady 0:556f9be6047d 42 {
cmulady 1:ae1d2167a10c 43 osEvent evt = ir_data_mailbox.get();
cmulady 1:ae1d2167a10c 44 if(evt.status == osEventMail) {
cmulady 1:ae1d2167a10c 45 char* mail = (char*)evt.value.p;
cmulady 1:ae1d2167a10c 46 (*data) = (*mail);
cmulady 1:ae1d2167a10c 47 ir_data_mailbox.free(mail);
cmulady 1:ae1d2167a10c 48 return 0;
cmulady 1:ae1d2167a10c 49 }
cmulady 1:ae1d2167a10c 50 return 1;
cmulady 1:ae1d2167a10c 51 }
cmulady 1:ae1d2167a10c 52
cmulady 1:ae1d2167a10c 53 //Handle Reception of RX data (mail it to appropriate thread)
cmulady 1:ae1d2167a10c 54 void IRTransmitter::isr_uartrx(void)
cmulady 1:ae1d2167a10c 55 {
cmulady 1:ae1d2167a10c 56 //get RX data (and prevent ISR from looping forever
cmulady 1:ae1d2167a10c 57 uint32_t RBR = LPC_UART1->RBR; //This only works for p13/p14!
cmulady 1:ae1d2167a10c 58
cmulady 1:ae1d2167a10c 59 //write letter and put in mailbox
cmulady 1:ae1d2167a10c 60 char* mail = ir_data_mailbox.alloc();
cmulady 1:ae1d2167a10c 61 mail[0] = (char)RBR;
cmulady 1:ae1d2167a10c 62 ir_data_mailbox.put(mail);
cmulady 1:ae1d2167a10c 63
cmulady 1:ae1d2167a10c 64 //Let message handler run
cmulady 1:ae1d2167a10c 65 //(*threadptr_irstuff).signal_set(0x1);
cmulady 0:556f9be6047d 66
cmulady 0:556f9be6047d 67 }
cmulady 0:556f9be6047d 68
cmulady 0:556f9be6047d 69