implement tuh_hid_receive_ready() and tuh_hid_send_ready()

Author: hathach

src/class/hid/hid_host.c

@@ -331,6 +331,15 @@ static bool _hidh_set_idle(uint8_t daddr, uint8_t itf_num, uint16_t idle_rate, t
 // Interrupt Endpoint API
 //--------------------------------------------------------------------+
 
+// Check if HID interface is ready to receive report
+bool tuh_hid_receive_ready(uint8_t dev_addr, uint8_t idx)
+{
+  hidh_interface_t* p_hid = get_hid_itf(dev_addr, idx);
+  TU_VERIFY(p_hid);
+
+  return !usbh_edpt_busy(dev_addr, p_hid->ep_in);
+}
+
 bool tuh_hid_receive_report(uint8_t daddr, uint8_t idx)
 {
   hidh_interface_t* p_hid = get_hid_itf(daddr, idx);
@@ -348,13 +357,13 @@ bool tuh_hid_receive_report(uint8_t daddr, uint8_t idx)
   return true;
 }
 
-//bool tuh_n_hid_n_ready(uint8_t dev_addr, uint8_t instance)
-//{
-//  TU_VERIFY(tuh_n_hid_n_mounted(dev_addr, instance));
-//
-//  hidh_interface_t* hid_itf = get_instance(dev_addr, instance);
-//  return !usbh_edpt_busy(dev_addr, hid_itf->ep_in);
-//}
+bool tuh_hid_send_ready(uint8_t dev_addr, uint8_t idx)
+{
+  hidh_interface_t* p_hid = get_hid_itf(dev_addr, idx);
+  TU_VERIFY(p_hid);
+
+  return !usbh_edpt_busy(dev_addr, p_hid->ep_out);
+}
 
 bool tuh_hid_send_report(uint8_t daddr, uint8_t idx, uint8_t report_id, const void* report, uint16_t len)
 {

src/class/hid/hid_host.h

@@ -62,7 +62,7 @@ typedef struct
 // Interface API
 //--------------------------------------------------------------------+
 
-// Get the number of mounted HID interfaces of a device
+// Get the total number of mounted HID interfaces of a device
 uint8_t tuh_hid_itf_get_count(uint8_t dev_addr);
 
 // Get all mounted interfaces across devices
@@ -109,14 +109,17 @@ bool tuh_hid_set_report(uint8_t dev_addr, uint8_t idx, uint8_t report_id, uint8_
 // Interrupt Endpoint API
 //--------------------------------------------------------------------+
 
-// Check if the interface is ready to use
-//bool tuh_n_hid_n_ready(uint8_t dev_addr, uint8_t idx);
+// Check if HID interface is ready to receive report
+bool tuh_hid_receive_ready(uint8_t dev_addr, uint8_t idx);
 
 // Try to receive next report on Interrupt Endpoint. Immediately return
 // - true If succeeded, tuh_hid_report_received_cb() callback will be invoked when report is available
 // - false if failed to queue the transfer e.g endpoint is busy
 bool tuh_hid_receive_report(uint8_t dev_addr, uint8_t idx);
 
+// Check if HID interface is ready to send report
+bool tuh_hid_send_ready(uint8_t dev_addr, uint8_t idx);
+
 // Send report using interrupt endpoint
 // If report_id > 0 (composite), it will be sent as 1st byte, then report contents. Otherwise only report content is sent.
 bool tuh_hid_send_report(uint8_t dev_addr, uint8_t idx, uint8_t report_id, const void* report, uint16_t len);