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Fix the OSTC4 firmware upgrade

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Commit d1b865d192afc9efde337b5cff8a239366f15565 breaks the OSTC4
firmware upgrade because the OSTC4 expects to receive the service init
command and the service key all at once, before sending any response.

The hwOS firmware still reads the service init command one byte at a
time, and sends the echo immediately after each byte. But in the
meantime, the hwos firmware has also been optimized. The processing time
for an incoming byte is now always faster then the time it takes for the
next byte to physically arrive via the serial line between the USB/BT
chip and the processor. Thus, even without any buffering, sending all
bytes at once should no longer be a problem.

This partially reverts commit d1b865d192afc9efde337b5cff8a239366f15565.

Reported-by: Anton Lundin <glance@acc.umu.se>
Suggested-by: Ralph Lembcke <mail@ralph-lembcke.de>
This commit is contained in:
Jef Driesen 2020-08-14 15:14:05 +02:00
parent c77551b366
commit 9dace57814
1 changed files with 15 additions and 29 deletions
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44
src/hw_ostc3.c
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@ -468,39 +468,25 @@ hw_ostc3_device_init_service (hw_ostc3_device_t *device)
const unsigned char command[] = {S_INIT, 0xAB, 0xCD, 0xEF};
unsigned char answer[5] = {0};
for (size_t i = 0; i < 4; ++i) {
// Send the command.
status = hw_ostc3_write (device, NULL, command + i, 1);
if (status != DC_STATUS_SUCCESS) {
ERROR (abstract->context, "Failed to send the command.");
return status;
}
// Read the answer.
status = hw_ostc3_read (device, NULL, answer + i, 1);
if (status != DC_STATUS_SUCCESS) {
ERROR (abstract->context, "Failed to receive the answer.");
return status;
}
// Verify the answer.
const unsigned char expected = (i == 0 ? 0x4B : command[i]);
if (answer[i] != expected) {
ERROR (abstract->context, "Unexpected answer byte.");
return DC_STATUS_PROTOCOL;
}
}
// Read the ready byte.
status = hw_ostc3_read (device, NULL, answer + 4, 1);
// Send the command and service key.
status = hw_ostc3_write (device, NULL, command, sizeof (command));
if (status != DC_STATUS_SUCCESS) {
ERROR (abstract->context, "Failed to receive the ready byte.");
ERROR (abstract->context, "Failed to send the command.");
return status;
}
// Verify the ready byte.
if (answer[4] != S_READY) {
ERROR (abstract->context, "Unexpected ready byte.");
// Read the response.
status = hw_ostc3_read (device, NULL, answer, sizeof (answer));
if (status != DC_STATUS_SUCCESS) {
ERROR (abstract->context, "Failed to receive the answer.");
return status;
}
// Verify the response to service mode.
if (answer[0] != 0x4B || answer[1] != 0xAB ||
answer[2] != 0xCD || answer[3] != 0xEF ||
answer[4] != S_READY) {
ERROR (abstract->context, "Failed to verify the answer.");
return DC_STATUS_PROTOCOL;
}