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bug #28520: Programming with USBasp with low clock speed fails 

* usbasp.c: Change blocksize depending on sck frequency to avoid usb transmition timeouts.



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@897 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Thomas Fischl 2010-01-08 18:33:23 +00:00
parent 0ccd81eb98
commit 9567713246
2 changed files with 54 additions and 32 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2010-01-08 Thomas Fischl <tfischl@gmx.de>
bug #28520: Programming with USBasp with low clock speed fails
* usbasp.c: Change blocksize depending on sck frequency to
avoid usb transmition timeouts.
2010-01-08 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
bug #27505: serbb_posix does not cope with inverted pins

80
usbasp.c
View File

@ -48,6 +48,7 @@
struct pdata
{
usb_dev_handle *usbhandle;
int sckfreq_hz;
};
#define PDATA(pgm) ((struct pdata *)(pgm->cookie))
@ -340,14 +341,18 @@ static int usbasp_paged_load(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
return -2;
}
/* set blocksize depending on sck frequency */
if ((PDATA(pgm)->sckfreq_hz > 0) && (PDATA(pgm)->sckfreq_hz < 10000)) {
blocksize = USBASP_READBLOCKSIZE / 10;
} else {
blocksize = USBASP_READBLOCKSIZE;
}
while (wbytes) {
if (wbytes > USBASP_READBLOCKSIZE) {
blocksize = USBASP_READBLOCKSIZE;
wbytes -= USBASP_READBLOCKSIZE;
} else {
if (wbytes <= blocksize) {
blocksize = wbytes;
wbytes = 0;
}
wbytes -= blocksize;
/* set address (new mode) - if firmware on usbasp support newmode, then they use address from this command */
unsigned char temp[4];
@ -403,15 +408,21 @@ static int usbasp_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
return -2;
}
/* set blocksize depending on sck frequency */
if ((PDATA(pgm)->sckfreq_hz > 0) && (PDATA(pgm)->sckfreq_hz < 10000)) {
blocksize = USBASP_WRITEBLOCKSIZE / 10;
} else {
blocksize = USBASP_WRITEBLOCKSIZE;
}
while (wbytes) {
if (wbytes > USBASP_WRITEBLOCKSIZE) {
blocksize = USBASP_WRITEBLOCKSIZE;
wbytes -= USBASP_WRITEBLOCKSIZE;
} else {
if (wbytes <= blocksize) {
blocksize = wbytes;
wbytes = 0;
blockflags |= USBASP_BLOCKFLAG_LAST;
}
wbytes -= blocksize;
/* set address (new mode) - if firmware on usbasp support newmode, then
they use address from this command */
@ -451,20 +462,20 @@ static int usbasp_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
}
/* The list of SCK frequencies in kHz supported by USBasp */
/* The list of SCK frequencies in Hz supported by USBasp */
static struct sckoptions_t usbaspSCKoptions[] = {
{ USBASP_ISP_SCK_1500, 1500 },
{ USBASP_ISP_SCK_750, 750 },
{ USBASP_ISP_SCK_375, 375 },
{ USBASP_ISP_SCK_187_5, 187.5 },
{ USBASP_ISP_SCK_93_75, 93.75 },
{ USBASP_ISP_SCK_32, 32 },
{ USBASP_ISP_SCK_16, 16 },
{ USBASP_ISP_SCK_8, 8 },
{ USBASP_ISP_SCK_4, 4 },
{ USBASP_ISP_SCK_2, 2 },
{ USBASP_ISP_SCK_1, 1 },
{ USBASP_ISP_SCK_0_5, 0.5 }
{ USBASP_ISP_SCK_1500, 1500000 },
{ USBASP_ISP_SCK_750, 750000 },
{ USBASP_ISP_SCK_375, 375000 },
{ USBASP_ISP_SCK_187_5, 187500 },
{ USBASP_ISP_SCK_93_75, 93750 },
{ USBASP_ISP_SCK_32, 32000 },
{ USBASP_ISP_SCK_16, 16000 },
{ USBASP_ISP_SCK_8, 8000 },
{ USBASP_ISP_SCK_4, 4000 },
{ USBASP_ISP_SCK_2, 2000 },
{ USBASP_ISP_SCK_1, 1000 },
{ USBASP_ISP_SCK_0_5, 500 }
};
@ -481,6 +492,9 @@ static int usbasp_set_sck_period(PROGRAMMER *pgm, double sckperiod)
memset(cmd, 0, sizeof(cmd));
memset(res, 0, sizeof(res));
/* reset global sck frequency to auto */
PDATA(pgm)->sckfreq_hz = 0;
if (sckperiod == 0) {
/* auto sck set */
@ -489,22 +503,21 @@ static int usbasp_set_sck_period(PROGRAMMER *pgm, double sckperiod)
} else {
double sckfreq = 1 / sckperiod / 1000; /* sck in kHz */
double usefreq = 0;
int sckfreq = 1 / sckperiod; /* sck in Hz */
int usefreq = 0;
if (verbose >= 2)
fprintf(stderr, "%s: try to set SCK period to %g s (= %g kHz)\n", progname, sckperiod, sckfreq);
if (sckperiod >= 1500) {
clockoption = USBASP_ISP_SCK_1500;
usefreq = 1500;
fprintf(stderr, "%s: try to set SCK period to %g s (= %i Hz)\n", progname, sckperiod, sckfreq);
if (sckfreq >= usbaspSCKoptions[0].frequency) {
clockoption = usbaspSCKoptions[0].id;
usefreq = usbaspSCKoptions[0].frequency;
} else {
/* find clock option next to given clock */
int i;
for (i = 0; i < sizeof(usbaspSCKoptions) / sizeof(usbaspSCKoptions[0]); i++) {
if (sckfreq >= usbaspSCKoptions[i].frequency) {
if (sckfreq >= usbaspSCKoptions[i].frequency - 1) { /* subtract 1 to compensate round errors */
clockoption = usbaspSCKoptions[i].id;
usefreq = usbaspSCKoptions[i].frequency;
break;
@ -512,7 +525,10 @@ static int usbasp_set_sck_period(PROGRAMMER *pgm, double sckperiod)
}
}
fprintf(stderr, "%s: set SCK frequency to %g kHz\n", progname, usefreq);
/* save used sck frequency */
PDATA(pgm)->sckfreq_hz = usefreq;
fprintf(stderr, "%s: set SCK frequency to %i Hz\n", progname, usefreq);
}
cmd[0] = clockoption;