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ethercat
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Fixed byte order.

This commit is contained in:
Florian Pose 2024-05-15 14:42:45 +02:00
parent f6f4cf74be
commit dd1187d942
1 changed files with 21 additions and 4 deletions
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25
master/fsm_eoe.c
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@ -33,6 +33,23 @@
/****************************************************************************/
/** Host-architecture-independent 32-bit swap function.
*
* The internal storage of struct in_addr is always big-endian.
* The mailbox protocol format to supply IPv4 adresses is little-endian
* (Yuck!). So we need a swap function, that is independent of the CPU
* architecture. ntohl()/htonl() can not be used, because they evaluate to
* NOPs if the host architecture matches the target architecture!
*/
void memcpy_swap32(void *dst, const void *src)
{
for (int i = 0; i < 4; i++) {
((u8 *) dst)[i] = ((const u8 *) src)[3 - i];
}
}
/****************************************************************************/
/** Maximum time to wait for a set IP parameter response.
*/
#define EC_EOE_RESPONSE_TIMEOUT 3000 // [ms]
@ -198,22 +215,22 @@ int ec_fsm_eoe_prepare_set(
cur += ETH_ALEN;
if (req->ip_address_included) {
memcpy(cur, &req->ip_address, 4);
memcpy_swap32(cur, &req->ip_address);
}
cur += 4;
if (req->subnet_mask_included) {
memcpy(cur, &req->subnet_mask, 4);
memcpy_swap32(cur, &req->subnet_mask);
}
cur += 4;
if (req->gateway_included) {
memcpy(cur, &req->gateway, 4);
memcpy_swap32(cur, &req->gateway);
}
cur += 4;
if (req->dns_included) {
memcpy(cur, &req->dns, 4);
memcpy_swap32(cur, &req->dns);
}
cur += 4;