avr/avrdude
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Rearrange the pinout for the programmer to be a little more logical.

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Provide hooks to support a buffered programmer, pin 6 is now used to
enable a buffer that can be used to isolate the target system from the
parallel port pins.  This is important when programming the target
in-system.

Totally change the way the pin definitions are defined.  Actually
set/clear pins based on the way more intuitive pin number, instead of
PPI data register, bit number combination.  A table of pin data is
used so that any hardware inversion done by the parallel port is
accounted for, what you set is actually what appears at the pin.
Retain the old method for handling Vcc, however, because the hold
method is much easier to use when setting / retrieving multiple pins
simultaneously.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@49 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Brian S. Dean
2001-01-24 18:45:58 +00:00
parent 6593c1e534
commit fc56e6b4f9
5 changed files with 218 additions and 67 deletions
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63
main.c
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@@ -32,25 +32,44 @@
/*
* Code to program an Atmel AVR AT90S device using the parallel port.
*
* Make the following connections:
* Make the following (minimal) connections:
*
* Parallel Port Atmel AVR
* ------------- ----------------------------
* Pin 2 -> Vcc (see NOTE below)
* Pin 3 -> SCK CLOCK IN
* Pin 4 -> MOSI Instruction input
* Pin 5 -> /RESET
* Pin 6,7,8,9 -> Vcc (Can be tied together with Schottky diodes)
* Pin 10 <- MISO Data out
* Pin 18 <- GND
* Parallel Port Programmer Function
* ------------- -----------------------------
* Pins 2-5 -> Vcc (see note below)
* Pin 7 -> AVR /RESET
* Pin 8 -> AVR SCK (clock input)
* Pin 9 -> AVR MOSI (instruction in)
* Pin 10 <- AVR MISO (data out)
* Pin 18 Signal Ground
*
* Additionally, the following conntections can be made to enable
* additional features:
*
* Parallel Port Programmer Function
* ------------- -----------------------------
* Pin 1 STATUS LED, active low (program or verify error)
* Pin 6 -> /ENABLE ('367 bus driver)
* Pin 14 STATUS LED, active low (ready)
* Pin 16 STATUS LED, active low (programming)
* Pin 17 STATUS LED, active low (verifying)
*
* Pin 6 can be tied to the enable line of a 74HC367 in order to
* isolate and buffer the data to and from the PC parallel port.
* This is useful for connecting to a device in-circuit, and keeps
* the state of the parallel port pins from interfering with the
* normal operation of the target system. When programming is
* complete, this pin is driven high, causing to pins of the '367 to
* float.
*
* NOTE on Vcc connection: make sure your parallel port can supply an
* adequate amount of current to power your device. 6-10 mA is
* common for parallel port signal lines, but is not guaranteed,
* especially for notebook computers. Optionally, you can tie pins
* 6, 7, 8, and 9 also to Vcc with Schottky diodes to supply
* additional current. If in doubt, don't risk damaging your
* parallel port, use an external power supply.
* adequate amount of current to power your device. 6-10 mA per pin
* is common for parallel port signal lines, but is not guaranteed,
* especially for notebook computers. For additional power, use
* multiple pins tied together with Schottky diodes. If in doubt,
* don't risk damaging your parallel port, use an external power
* supply.
*
*/
#include <stdio.h>
@@ -104,16 +123,16 @@ int getexitspecs ( char *s, int *set, int *clr )
while ((cp = strtok(s, ","))) {
if (strcmp(cp, "reset") == 0) {
*clr |= AVR_RESET;
*clr |= ppi_getpinmask(PIN_AVR_RESET);
}
else if (strcmp(cp, "noreset") == 0) {
*set |= AVR_RESET;
*set |= ppi_getpinmask(PIN_AVR_RESET);
}
else if (strcmp(cp, "vcc") == 0) {
*set |= AVR_POWER;
*set |= PPI_AVR_VCC;
}
else if (strcmp(cp, "novcc") == 0) {
*clr |= AVR_POWER;
*clr |= PPI_AVR_VCC;
}
else {
return -1;
@@ -374,6 +393,10 @@ int main ( int argc, char * argv [] )
exitrc = 0;
#if 0
ppi_sense(fd);
#endif
ppidata = ppi_getall(fd, PPIDATA);
if (ppidata < 0) {
fprintf ( stderr, "%s: error reading status of ppi data port\n", progname);