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sysclk-lwla: Read test word twice during initialization 

During initialization of the LWLA1034, read the 64-bit test word
twice and verify the result of the second read only. This better
matches what the original vendor software does.
This commit is contained in:
Daniel Elstner 2015-10-25 03:44:55 +01:00
parent 3a322bbc3b
commit e1172cf847
3 changed files with 39 additions and 22 deletions
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27
src/hardware/sysclk-lwla/lwla.c
View File

@ -191,6 +191,33 @@ SR_PRIV int lwla_read_reg(const struct sr_usb_dev_inst *usb,
return ret;
}
SR_PRIV int lwla_read_long_reg(const struct sr_usb_dev_inst *usb,
uint32_t addr, uint64_t *value)
{
uint32_t low, high, dummy;
int ret;
ret = lwla_write_reg(usb, REG_LONG_ADDR, addr);
if (ret != SR_OK)
return ret;
ret = lwla_read_reg(usb, REG_LONG_STROBE, &dummy);
if (ret != SR_OK)
return ret;
ret = lwla_read_reg(usb, REG_LONG_HIGH, &high);
if (ret != SR_OK)
return ret;
ret = lwla_read_reg(usb, REG_LONG_LOW, &low);
if (ret != SR_OK)
return ret;
*value = ((uint64_t)high << 32) | low;
return SR_OK;
}
SR_PRIV int lwla_write_reg(const struct sr_usb_dev_inst *usb,
uint16_t reg, uint32_t value)
{

3
src/hardware/sysclk-lwla/lwla.h
View File

@ -114,6 +114,9 @@ SR_PRIV int lwla_receive_reply(const struct sr_usb_dev_inst *usb,
SR_PRIV int lwla_read_reg(const struct sr_usb_dev_inst *usb,
uint16_t reg, uint32_t *value);
SR_PRIV int lwla_read_long_reg(const struct sr_usb_dev_inst *usb,
uint32_t addr, uint64_t *value);
SR_PRIV int lwla_write_reg(const struct sr_usb_dev_inst *usb,
uint16_t reg, uint32_t value);

31
src/hardware/sysclk-lwla/protocol.c
View File

@ -700,9 +700,9 @@ static void LIBUSB_CALL receive_transfer_in(struct libusb_transfer *transfer)
*/
SR_PRIV int lwla_init_device(const struct sr_dev_inst *sdi)
{
uint64_t value;
struct dev_context *devc;
int ret;
uint32_t value;
devc = sdi->priv;
@ -710,36 +710,23 @@ SR_PRIV int lwla_init_device(const struct sr_dev_inst *sdi)
devc->cur_clock_config = CONF_CLOCK_NONE;
ret = lwla_set_clock_config(sdi);
if (ret != SR_OK)
return ret;
ret = lwla_write_reg(sdi->conn, REG_LONG_ADDR, 100);
ret = lwla_read_long_reg(sdi->conn, 100, &value);
if (ret != SR_OK)
return ret;
ret = lwla_read_reg(sdi->conn, REG_LONG_STROBE, &value);
/* Ignore the value returned by the first read */
ret = lwla_read_long_reg(sdi->conn, 100, &value);
if (ret != SR_OK)
return ret;
sr_dbg("Received test word 0x%08X back.", value);
if (value != 0x12345678)
if (value != UINT64_C(0x1234567887654321)) {
sr_err("Received invalid test word 0x%16" PRIX64 ".", value);
return SR_ERR;
ret = lwla_read_reg(sdi->conn, REG_LONG_HIGH, &value);
if (ret != SR_OK)
return ret;
sr_dbg("Received test word 0x%08X back.", value);
if (value != 0x12345678)
return SR_ERR;
ret = lwla_read_reg(sdi->conn, REG_LONG_LOW, &value);
if (ret != SR_OK)
return ret;
sr_dbg("Received test word 0x%08X back.", value);
if (value != 0x87654321)
return SR_ERR;
return ret;
}
return SR_OK;
}
/* Select the LWLA clock configuration. If the clock source changed from