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Submitted by Dick Streefland: 

patch #6749: make reading from the USBtinyISP programmer more robust

Add code to retry failed communication attempts.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@799 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
joerg_wunsch 2009-02-18 20:10:32 +00:00
parent 4f4b1bce93
commit 1c20a074e3
2 changed files with 40 additions and 15 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2009-02-18 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
Submitted by Dick Streefland:
patch #6749: make reading from the USBtinyISP programmer more robust
* usbtiny.c: Add code to retry failed communication attempts.
2009-02-17 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
Submitted by Nick Hibma:

35
usbtiny.c
View File

@ -55,6 +55,7 @@ struct pdata
usb_dev_handle *usb_handle;
int sck_period;
int chunk_size;
int retries;
};
#define PDATA(pgm) ((struct pdata *)(pgm->cookie))
@ -89,7 +90,7 @@ static int usb_control (PROGRAMMER * pgm,
NULL, 0, // no data buffer in control messge
USB_TIMEOUT ); // default timeout
if(nbytes < 0){
fprintf(stderr, "%s: error: usbtiny_transmit: %s\n", progname, usb_strerror());
fprintf(stderr, "\n%s: error: usbtiny_transmit: %s\n", progname, usb_strerror());
exit(1);
}
@ -103,24 +104,37 @@ static int usb_in (PROGRAMMER * pgm,
{
int nbytes;
int timeout;
int i;
// calculate the amout of time we expect the process to take by
// figuring the bit-clock time and buffer size and adding to the standard USB timeout.
timeout = USB_TIMEOUT + (buflen * bitclk) / 1000;
for (i = 0; i < 10; i++) {
nbytes = usb_control_msg( PDATA(pgm)->usb_handle,
USB_ENDPOINT_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
requestid,
val, index,
(char *)buffer, buflen,
timeout);
if (nbytes != buflen) {
fprintf(stderr, "%s: error: usbtiny_receive: %s (expected %d, got %d)\n",
if (nbytes == buflen) {
return nbytes;
}
PDATA(pgm)->retries++;
}
fprintf(stderr, "\n%s: error: usbtiny_receive: %s (expected %d, got %d)\n",
progname, usb_strerror(), buflen, nbytes);
exit(1);
}
}
return nbytes;
// Report the number of retries, and reset the counter.
static void check_retries (PROGRAMMER * pgm, const char* operation)
{
if (PDATA(pgm)->retries > 0 && quell_progress < 2) {
printf("%s: %d retries during %s\n", progname,
PDATA(pgm)->retries, operation);
}
PDATA(pgm)->retries = 0;
}
// Wrapper for simple usb_control_msg messages to send data to programmer
@ -142,7 +156,7 @@ static int usb_out (PROGRAMMER * pgm,
(char *)buffer, buflen,
timeout);
if (nbytes != buflen) {
fprintf(stderr, "%s: error: usbtiny_send: %s (expected %d, got %d)\n",
fprintf(stderr, "\n%s: error: usbtiny_send: %s (expected %d, got %d)\n",
progname, usb_strerror(), buflen, nbytes);
exit(1);
}
@ -249,7 +263,10 @@ static int usbtiny_set_sck_period (PROGRAMMER *pgm, double v)
if (PDATA(pgm)->sck_period > SCK_MAX)
PDATA(pgm)->sck_period = SCK_MAX;
printf( "%s: Setting SCK period to %d usec\n", progname, PDATA(pgm)->sck_period );
if (verbose) {
printf( "%s: Setting SCK period to %d usec\n", progname,
PDATA(pgm)->sck_period );
}
// send the command to the usbtiny device.
usb_control(pgm, USBTINY_POWERUP, PDATA(pgm)->sck_period, RESET_LOW); // MEME: for at90's fix resetstate?
@ -318,6 +335,7 @@ static int usbtiny_cmd(PROGRAMMER * pgm, unsigned char cmd[4], unsigned char res
(cmd[1] << 8) | cmd[0], // convert to 16-bit words
(cmd[3] << 8) | cmd[2], // "
res, 4, 8 * PDATA(pgm)->sck_period );
check_retries(pgm, "SPI command");
if (verbose > 1) {
// print out the data we sent and received
printf( "CMD: [%02x %02x %02x %02x] [%02x %02x %02x %02x]\n",
@ -399,6 +417,7 @@ static int usbtiny_paged_load (PROGRAMMER * pgm, AVRPART * p, AVRMEM* m,
report_progress(i + chunk, n_bytes, NULL );
}
check_retries(pgm, "read");
return n_bytes;
}
@ -450,7 +469,7 @@ static int usbtiny_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
m->buf + i, // Pointer to data
chunk, // Number of bytes to write
32 * PDATA(pgm)->sck_period + delay // each byte gets turned into a
// 4-byte SPI cmd usb_in() multiplies
// 4-byte SPI cmd usb_out() multiplies
// this per byte. Then add the cmd-delay
);