Simon Nield [simon.nield at quantel.com] says:
one thing to bear in mind when accessing the parallel port in epp mode is that it _does_ drop back into spp mode between reads / writes, so make sure you set up the spp mode correctly first.I have pasted a small code snippet below that worked fine in Win95.
The hardware end of this code was an Altera 7k128 in case you were wondering.
unsigned short PORT=0x378; // parallel base port typedef struct FooCtrl { short position; } FooCtrl; void TalkToFooCtrl( FooCtrl *testboard, unsigned short base, short pwm) { unsigned short address_port, data_port, control_port; short position_delta; control_port = base + 2; // SPP control port address_port = base + 3; // EPP address port data_port = base + 4; // EPP data port _outp(control_port, 0x00); // ensure strobes deasserted in between EPP transfers _outp(address_port, pwm); _outp(data_port, pwm >> 8); position_delta = _inp(data_port); position_delta = position_delta << 8; position_delta += _inp(address_port); testboard->position = position_delta; }
file: /Techref/io/parallel/1284/ecp-ccode-sn.htm, 1KB, , updated: 2002/9/24 06:03, local time: 2024/10/12 01:55,
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