From 0d2c08efd7145b160ab0ed373b2cf956699cfb74 Mon Sep 17 00:00:00 2001 From: Joel Michael Date: Wed, 16 Apr 2025 20:26:35 +1000 Subject: note potential issues using ep_desc in hcd_edpt_open() --- src/portable/template/hcd_template.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'src') diff --git a/src/portable/template/hcd_template.c b/src/portable/template/hcd_template.c index b073d6057..694fa8550 100644 --- a/src/portable/template/hcd_template.c +++ b/src/portable/template/hcd_template.c @@ -116,6 +116,10 @@ void hcd_device_close(uint8_t rhport, uint8_t dev_addr) { bool hcd_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const * ep_desc) { (void) rhport; (void) dev_addr; + + // NOTE: ep_desc is allocated on the stack when called from usbh_edpt_control_open() + // If you need to persist any ep_desc values across HCD calls (eg ep_desc->wMaxPacketSize), + // then you need to copy the data into another variable inside this function. (void) ep_desc; return false; -- cgit v1.3.1 From 713410997326269b4072dce906933f8f44fd0efe Mon Sep 17 00:00:00 2001 From: HiFiPhile Date: Fri, 18 Apr 2025 11:12:14 +0200 Subject: Update hcd_edpt_open() note. Signed-off-by: HiFiPhile --- src/portable/template/hcd_template.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src') diff --git a/src/portable/template/hcd_template.c b/src/portable/template/hcd_template.c index 694fa8550..fd870c91e 100644 --- a/src/portable/template/hcd_template.c +++ b/src/portable/template/hcd_template.c @@ -118,8 +118,8 @@ bool hcd_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const (void) dev_addr; // NOTE: ep_desc is allocated on the stack when called from usbh_edpt_control_open() - // If you need to persist any ep_desc values across HCD calls (eg ep_desc->wMaxPacketSize), - // then you need to copy the data into another variable inside this function. + // You need to copy the data into a local variable who maintains the state of the endpoint and transfer. + // Check _hcd_data in hcd_dwc2.c for example. (void) ep_desc; return false; -- cgit v1.3.1