diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 37cc4c40d..985c9ef34 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,6 +15,8 @@ jobs:
     steps:
     - name: Setup Ruby
       uses: actions/setup-ruby@v1
+      with:
+        ruby-version: '2.7'
 
     - name: Checkout TinyUSB
       uses: actions/checkout@v2
diff --git a/examples/device/usbtmc/src/usb_descriptors.c b/examples/device/usbtmc/src/usb_descriptors.c
index 505456769..2336266b8 100644
--- a/examples/device/usbtmc/src/usb_descriptors.c
+++ b/examples/device/usbtmc/src/usb_descriptors.c
@@ -80,10 +80,11 @@ uint8_t const * tud_descriptor_device_cb(void)
      TUD_USBTMC_BULK_DESCRIPTORS(/* OUT = */0x01, /* IN = */ 0x81, /* packet size = */USBTMCD_MAX_PACKET_SIZE)
 
 #if CFG_TUD_USBTMC_ENABLE_INT_EP
-// Interrupt endpoint should be 2 bytes on a FS USB link
+// USBTMC Interrupt xfer always has length of 2, but we use epMaxSize=8 for
+//  compatibility with mcus that only allow 8, 16, 32 or 64 for FS endpoints
 #  define TUD_USBTMC_DESC(_itfnum) \
      TUD_USBTMC_DESC_MAIN(_itfnum, /* _epCount = */ 3), \
-     TUD_USBTMC_INT_DESCRIPTOR(/* INT ep # */ 0x82, /* epMaxSize = */ 2, /* bInterval = */16u )
+     TUD_USBTMC_INT_DESCRIPTOR(/* INT ep # */ 0x82, /* epMaxSize = */ 8, /* bInterval = */16u )
 #  define TUD_USBTMC_DESC_LEN (TUD_USBTMC_IF_DESCRIPTOR_LEN + TUD_USBTMC_BULK_DESCRIPTORS_LEN + TUD_USBTMC_INT_DESCRIPTOR_LEN)
 
 #else
diff --git a/src/class/midi/midi_device.c b/src/class/midi/midi_device.c
index ce4c9cafe..9fff20be2 100644
--- a/src/class/midi/midi_device.c
+++ b/src/class/midi/midi_device.c
@@ -192,6 +192,7 @@ uint32_t tud_midi_n_write(uint8_t itf, uint8_t jack_id, uint8_t const* buffer, u
         if (midi->write_buffer[0] == 0x4) {
             if (data == 0xf7) {
                 midi->write_buffer[0] = 0x5;
+                midi->write_target_length = 2;
             } else {
                 midi->write_target_length = 4;
             }
diff --git a/src/portable/raspberrypi/rp2040/dcd_rp2040.c b/src/portable/raspberrypi/rp2040/dcd_rp2040.c
index aaaa22e55..a54f579b8 100644
--- a/src/portable/raspberrypi/rp2040/dcd_rp2040.c
+++ b/src/portable/raspberrypi/rp2040/dcd_rp2040.c
@@ -38,8 +38,6 @@
 
 #include "device/dcd.h"
 
-#include "pico/stdlib.h"
-
 /*------------------------------------------------------------------*/
 /* Low level controller
  *------------------------------------------------------------------*/
@@ -66,11 +64,7 @@ static struct hw_endpoint *hw_endpoint_get_by_addr(uint8_t ep_addr)
 }
 static void _hw_endpoint_alloc(struct hw_endpoint *ep)
 {
-    uint size = 64;
-    if (ep->wMaxPacketSize > 64)
-    {
-        size = ep->wMaxPacketSize;
-    }
+    uint size = TU_MIN(64, ep->wMaxPacketSize);
 
     // Assumes single buffered for now
     ep->hw_data_buf = next_buffer_ptr;
@@ -243,7 +237,7 @@ static void reset_ep0(void)
     // If we have finished this transfer on EP0 set pid back to 1 for next
     // setup transfer. Also clear a stall in case
     uint8_t addrs[] = {0x0, 0x80};
-    for (uint i = 0 ; i < count_of(addrs); i++)
+    for (uint i = 0 ; i < TU_ARRAY_SIZE(addrs); i++)
     {
         struct hw_endpoint *ep = hw_endpoint_get_by_addr(addrs[i]);
         ep->next_pid = 1u;
@@ -474,4 +468,10 @@ void dcd_edpt_close (uint8_t rhport, uint8_t ep_addr)
 
 }
 
+void dcd_int_handler(uint8_t rhport)
+{
+    (void) rhport;
+    dcd_rp2040_irq();
+}
+
 #endif
diff --git a/src/portable/raspberrypi/rp2040/hcd_rp2040.c b/src/portable/raspberrypi/rp2040/hcd_rp2040.c
index c74578c3c..efb2bd430 100644
--- a/src/portable/raspberrypi/rp2040/hcd_rp2040.c
+++ b/src/portable/raspberrypi/rp2040/hcd_rp2040.c
@@ -86,7 +86,7 @@ static void set_dev_ep(uint8_t dev_addr, uint8_t ep_addr, struct hw_endpoint *ep
     uint8_t num = tu_edpt_number(ep_addr);
     uint8_t in = (ep_addr & TUSB_DIR_IN_MASK) ? 1 : 0;
     uint32_t index = ep - eps;
-    hard_assert(index < count_of(eps));
+    hard_assert(index < TU_ARRAY_SIZE(eps));
     // todo revisit why dev_addr can be 0 here
     if (dev_addr) {
         dev_ep_map[dev_addr-1][num][in] = 128u | index;
@@ -245,7 +245,7 @@ static void hcd_rp2040_irq(void)
 static struct hw_endpoint *_next_free_interrupt_ep(void)
 {
     struct hw_endpoint *ep = NULL;
-    for (uint i = 1; i < count_of(eps); i++)
+    for (uint i = 1; i < TU_ARRAY_SIZE(eps); i++)
     {
         ep = &eps[i];
         if (!ep->configured)
@@ -444,6 +444,7 @@ bool hcd_edpt_xfer(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr, uint8_t *
     
     // Get appropriate ep. Either EPX or interrupt endpoint
     struct hw_endpoint *ep = get_dev_ep(dev_addr, ep_addr);
+    assert(ep);
 
     if (ep_addr != ep->ep_addr)
     {
diff --git a/test/test/device/usbd/test_usbd.c b/test/test/device/usbd/test_usbd.c
index 06372b2e4..c90383b57 100644
--- a/test/test/device/usbd/test_usbd.c
+++ b/test/test/device/usbd/test_usbd.c
@@ -209,10 +209,10 @@ void test_usbd_control_in_zlp(void)
 {
   // 128 byte total len, with EP0 size = 64, and request length = 256
   // ZLP must be return
-  uint8_t zlp_desc_configuration[CFG_TUD_ENDOINT0_SIZE*2] =
+  uint8_t zlp_desc_configuration[CFG_TUD_ENDPOINT0_SIZE*2] =
   {
     // Config number, interface count, string index, total length, attribute, power in mA
-    TUD_CONFIG_DESCRIPTOR(1, 0, 0, CFG_TUD_ENDOINT0_SIZE*2, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
+    TUD_CONFIG_DESCRIPTOR(1, 0, 0, CFG_TUD_ENDPOINT0_SIZE*2, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
   };
 
   desc_configuration = zlp_desc_configuration;
@@ -222,13 +222,13 @@ void test_usbd_control_in_zlp(void)
 
   // 1st transaction
   dcd_edpt_xfer_ExpectWithArrayAndReturn(rhport, EDPT_CTRL_IN,
-                                         zlp_desc_configuration, CFG_TUD_ENDOINT0_SIZE, CFG_TUD_ENDOINT0_SIZE, true);
-  dcd_event_xfer_complete(rhport, EDPT_CTRL_IN, CFG_TUD_ENDOINT0_SIZE, 0, false);
+                                         zlp_desc_configuration, CFG_TUD_ENDPOINT0_SIZE, CFG_TUD_ENDPOINT0_SIZE, true);
+  dcd_event_xfer_complete(rhport, EDPT_CTRL_IN, CFG_TUD_ENDPOINT0_SIZE, 0, false);
 
   // 2nd transaction
   dcd_edpt_xfer_ExpectWithArrayAndReturn(rhport, EDPT_CTRL_IN,
-                                         zlp_desc_configuration + CFG_TUD_ENDOINT0_SIZE, CFG_TUD_ENDOINT0_SIZE, CFG_TUD_ENDOINT0_SIZE, true);
-  dcd_event_xfer_complete(rhport, EDPT_CTRL_IN, CFG_TUD_ENDOINT0_SIZE, 0, false);
+                                         zlp_desc_configuration + CFG_TUD_ENDPOINT0_SIZE, CFG_TUD_ENDPOINT0_SIZE, CFG_TUD_ENDPOINT0_SIZE, true);
+  dcd_event_xfer_complete(rhport, EDPT_CTRL_IN, CFG_TUD_ENDPOINT0_SIZE, 0, false);
 
   // Expect Zero length Packet
   dcd_edpt_xfer_ExpectAndReturn(rhport, EDPT_CTRL_IN, NULL, 0, true);
diff --git a/test/test/support/tusb_config.h b/test/test/support/tusb_config.h
index d80e144da..0455f933b 100644
--- a/test/test/support/tusb_config.h
+++ b/test/test/support/tusb_config.h
@@ -74,7 +74,7 @@
 //--------------------------------------------------------------------
 
 #define CFG_TUD_TASK_QUEUE_SZ    100
-#define CFG_TUD_ENDOINT0_SIZE    64
+#define CFG_TUD_ENDPOINT0_SIZE    64
 
 //------------- CLASS -------------//
 //#define CFG_TUD_CDC              0