source: fact/tools/hvMCUtest/ARDUINO_FTDI/portmanipulation.h@ 15063

Last change on this file since 15063 was 12143, checked in by neise, 13 years ago
Arduinocode for Arduino-Microcontroller to communicate with PLD
File size: 1.2 KB
Line 
1
2unsigned char ReadFromDataBus(){
3 // The eight bits of the databus are distributed over
4 // the two differen ports of the ATmega. Port C and D
5 // actually they are connected like this:
6 // data0...data3 are connected to Arduino Pins D4..D7
7 // data4...data7 are connected to Arduino Pins C0..D3
8 return ( (PINC&0x0f) << 4 ) | ( (PIND&0xf0) >> 4) ;
9}
10
11void PutOnDataBus ( unsigned char data) {
12 // okay .. .again
13 // data0..3 is connected to PD4..7
14 // data4..7 is connected to PC0..3
15 PORTC = (PORTC & 0xf0) | (data&0xf0)>>4 ;
16 PORTD = (PORTD & 0x0f) | (data&0x0f)<<4 ;
17}
18
19
20void MakeDataBusOutput() {
21 // making the databus out can be done like this:
22 // data0..3 is connected to PD4..7
23 // data4..7 is connected to PC0..3
24
25 // also auf PORTC die bits 0 bis 3 setzen!
26 DDRC |= 0x0f;
27 // und auf PORTD die bits 4 bis 7 setzen!
28 DDRD |= 0xf0;
29
30 // Um die Pullups muss man sicht nicht kümmern, da nach dieser Funktion sowieso ein neuer Wert auf den Bus
31 // geschrieben wird.
32}
33
34void MakeDataBusInput() {
35// see the comments in MakeDataBusOutput()
36
37//first we switch the outs to ins
38// then we switch on the pullups
39
40 DDRC &= 0xf0;
41 DDRD &= 0x0f;
42// now the pull ups
43 PORTC |= 0x0f;
44 PORTD |= 0xf0;
45}
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