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Proto.cpp
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Proto.cpp
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#include "Proto.h"
Proto::Proto(){
_initGPIO();
}
void Proto::_initGPIO(){
*(LPC_PINCON_PINSEL4) &= ~(3<<11);
*(LPC_PINCON_PINSEL4) &= ~(3<<9);
*(LPC_GPIO2_FIODIR) |= (1<<5);
*(LPC_GPIO2_FIODIR) |= (1<<4);
*(LPC_PINCON_PINMODE4) |= (3<<10);
*(LPC_PINCON_PINMODE4) |= (3<<8);
}
Command Proto::read(){
char counter=0;
char done = 0;
// int value;
unsigned char result = 0;
unsigned char clk = 0;
unsigned char value = 0;
DigitalIn _clk(p22);
DigitalIn _value(p21);
while(counter < 7)
{
clk = (unsigned char) _clk;
//clk = !!(*(LPC_GPIO2_FIOPIN) & (1 << 4)); // Clock is 0 or 1
//value = !!(*(LPC_GPIO2_FIOPIN) & (1 << 5)); // Bit is 0 or 1
//printf("Clk: %d\n", (int)clk);
//printf("Data: %d\n", value);
// If we did not already read the value and clk == 1
if(clk && !done){
//value = !!(*(LPC_GPIO2_FIOPIN) & (1 << 5)); // Bit is 0 or 1
value = (unsigned char) _value;
if(value) {
result |= (1 << (6 - counter));
}
done = 1;
counter++;
}
else if(!clk){
done=0;
}
wait_us(10);
}
//printf("0x%.2X\n", result);
return getCommand(result);
}
Command Proto::getCommand(unsigned char value){
unsigned char temp;
int counter = 0;
// Start bit == 1
temp = (unsigned char) (value | ~(1 << 6));
if(temp != 0xFF ) {
return ERROR;
}
// Stop bit == 1
temp = (unsigned char) (value | ~(1 << 0));
if(temp != 0xFF ) {
return ERROR;
}
// Parity check
for(int i=5; i>1; i--)
{
temp = (unsigned char) (value | ~(1 << i));
if(temp == 0xFF ) {
counter++;
}
}
temp = (unsigned char) (value | ~(1 << 1));
if((temp == 0xFF)!=(counter%2)) {
return ERROR;
}
// Command On | Off
char cmd = 0;
temp = (unsigned char) (value | ~(1 << 5));
if(temp == 0xFF ) {
cmd = 1;
}
// Function
temp = (value & ~(0b11100011)) >> 2;
switch(temp){
case 0 :
return cmd ? DOT1_ON:DOT1_OFF;
case 1 :
return cmd ? DOT2_ON:DOT2_OFF;
case 2:
return cmd ? DOT3_ON:DOT3_OFF;
case 3:
return cmd ? DOT4_ON:DOT4_OFF;
case 4:
return cmd ? DOT5_ON:DOT5_OFF;
case 5:
return cmd ? DOT6_ON:DOT6_OFF;
case 6:
return cmd ? LIGHT_UP:LIGHT_DOWN;
default:
printf("default\n");
return ERROR;
}
}