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Implement a hashfast get_header function which reads till it finds a header preamble or times out.

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This commit is contained in:
Con Kolivas 2013-10-13 21:39:59 +11:00
parent 4b9eb3707b
commit 58dd80e459
2 changed files with 45 additions and 3 deletions
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44
driver-hashfast.c
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@ -138,13 +138,44 @@ static bool hashfast_send_header(struct cgpu_info *hashfast, struct hf_header *h
len = sizeof(*h);
ret = usb_write(hashfast, (char *)h, len, &amount, hf_cmds[cmd].usb_cmd);
if (ret < 0 || amount != len) {
applog(LOG_WARNING, "HFA%d: send_header: USB Send error, ret %d amount %d vs. length %d",
hashfast->device_id, ret, amount, len);
applog(LOG_WARNING, "HFA%d: send_header: %s USB Send error, ret %d amount %d vs. length %d",
hashfast->device_id, hf_cmds[cmd].cmd_name, ret, amount, len);
return false;
}
return true;
}
static bool hashfast_get_header(struct cgpu_info *hashfast, struct hf_header *h,
uint8_t *computed_crc)
{
int amount, ret, orig_len, len, ofs = 0, reads = 0;
char buf[512];
char *header;
/* Read for up to 200ms till we find the first occurrence of HF_PREAMBLE
* though it should be the first byte unless we get woefully out of
* sync. */
orig_len = len = sizeof(*h);
do {
if (++reads > 20)
return false;
ret = usb_read_timeout(hashfast, buf + ofs, len, &amount, 10, C_HF_GETHEADER);
if (unlikely(ret))
return false;
ofs += amount;
header = memchr(buf, HF_PREAMBLE, ofs);
if (header)
len -= ofs - (header - buf);
} while (len);
memcpy(h, header, orig_len);
*computed_crc = hf_crc8((uint8_t *)h);
return true;
}
static bool hashfast_reset(struct cgpu_info *hashfast, struct hashfast_info *info)
{
struct hf_usb_init_header usb_init, *hu = &usb_init;
@ -154,6 +185,7 @@ static bool hashfast_reset(struct cgpu_info *hashfast, struct hashfast_info *inf
uint8_t hcrc;
uint8_t addr;
uint16_t hdata;
int i;
info->hash_clock_rate = 550; // Hash clock rate in Mhz
// Assemble the USB_INIT request
@ -169,6 +201,14 @@ static bool hashfast_reset(struct cgpu_info *hashfast, struct hashfast_info *inf
if (!hashfast_send_header(hashfast, (struct hf_header *)hu, HF_USB_CMD(OP_USB_INIT)))
return false;
// Check for the correct response.
// We extend the normal timeout - a complete device initialization, including
// bringing power supplies up from standby, etc., can take over a second.
for (i = 0; i < 30; i++) {
if (hashfast_get_header(hashfast, h, &hcrc))
break;
}
return true;
}

4
usbutils.h
View File

@ -359,7 +359,9 @@ struct cg_usb_info {
USB_ADD_COMMAND(C_HF_DIE_STATUS, "HFDieStatus") \
USB_ADD_COMMAND(C_HF_GWQ_STATUS, "HFGWQStatus") \
USB_ADD_COMMAND(C_HF_WORK_RESTART, "HFWorkRestart") \
USB_ADD_COMMAND(C_HF_GWQSTATS, "HFGWQStats")
USB_ADD_COMMAND(C_HF_GWQSTATS, "HFGWQStats") \
USB_ADD_COMMAND(C_HF_GETHEADER, "HFGetHeader") \
USB_ADD_COMMAND(C_HF_GETDATA, "HFGetData")
/* Create usb_cmds enum from USB_PARSE_COMMANDS macro */
enum usb_cmds {