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USB: add some grace time after address setup

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This commit is contained in:
Gyorgy Szombathelyi
2022-08-04 15:19:32 +02:00
parent dbd05d5aa3
commit 9c1fb3ba76
3 changed files with 12 additions and 3 deletions
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5
usb/timer.c
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@@ -13,6 +13,11 @@ msec_t timer_get_msec() {
return GetRTTC();
}
bool timer_check(msec_t ref, msec_t delay) {
msec_t now = GetRTTC();
return ((now-ref) >= delay);
}
void timer_delay_msec(msec_t t) {
msec_t now = GetRTTC();

2
usb/timer.h
View File

@@ -4,10 +4,12 @@
#define TIMER_H
#include <inttypes.h>
#include <stdbool.h>
typedef uint32_t msec_t;
void timer_init();
msec_t timer_get_msec();
void timer_delay_msec(msec_t t);
bool timer_check(msec_t ref, msec_t delay);
#endif // TIMER_H

8
usb/usb.c
View File

@@ -80,9 +80,11 @@ uint8_t usb_configure(uint8_t parent, uint8_t port, bool lowspeed) {
iprintf("failed to assign address (rcode=%d)", rcode);
return rcode;
}
if(rcode = usb_get_dev_descr( d, 8, &dev_desc ))
return rcode;
uint32_t timer = timer_get_msec();
do {
rcode = usb_get_dev_descr( d, 8, &dev_desc );
} while (rcode && !timer_check(timer, 5)); // Some recovery interval (2 ms as USB 2.0 9.2.6.3)
if(rcode) return rcode;
// --- enumerate device ---
if(rcode = usb_get_dev_descr( d, sizeof(usb_device_descriptor_t), &dev_desc ))