adapt SAM core to PluggableUSB stable API

Author: facchinm

hardware/arduino/sam/cores/arduino/USB/PluggableUSB.cpp

@@ -19,80 +19,89 @@
 
 #include "USBAPI.h"
 #include "USBDesc.h"
+#include "USBCore.h"
 #include "PluggableUSB.h"
 
+#if defined(USBCON)
 #ifdef PLUGGABLE_USB_ENABLED
 
-#define MAX_MODULES	6
-
-static uint8_t lastIf = CDC_ACM_INTERFACE + CDC_INTERFACE_COUNT;
-static uint8_t lastEp = CDC_FIRST_ENDPOINT + CDC_ENPOINT_COUNT;
-
 extern uint32_t EndPoints[];
 
-//PUSBCallbacks cbs[MAX_MODULES];
-static uint8_t modules_count = 0;
-
-static PUSBListNode* rootNode = NULL;
-
-int PUSB_GetInterface(uint8_t* interfaceNum)
+int PluggableUSB_::getInterface(uint8_t* interfaceCount)
 {
-	int ret = 0;
-	PUSBListNode* node = rootNode;
-	for (uint8_t i=0; i<modules_count; i++) {
-		ret = node->cb->getInterface(interfaceNum);
-		node = node->next;
+	int sent = 0;
+	PluggableUSBModule* node;
+	for (node = rootNode; node; node = node->next) {
+		int res = node->getInterface(interfaceCount);
+		if (res < 0)
+			return -1;
+		sent += res;
 	}
-	return ret;
+	return sent;
 }
 
-int PUSB_GetDescriptor(int8_t t)
+int PluggableUSB_::getDescriptor(USBSetup& setup)
 {
-	int ret = 0;
-	PUSBListNode* node = rootNode;
-	for (uint8_t i=0; i<modules_count && ret == 0; i++) {
-		ret = node->cb->getDescriptor(t);
-		node = node->next;
+	PluggableUSBModule* node;
+	for (node = rootNode; node; node = node->next) {
+		int ret = node->getDescriptor(setup);
+		// ret!=0 -> request has been processed
+		if (ret)
+			return ret;
 	}
-	return ret;
+	return 0;
 }
 
-bool PUSB_Setup(USBSetup& setup, uint8_t j)
+bool PluggableUSB_::setup(USBSetup& setup)
 {
-	bool ret = false;
-	PUSBListNode* node = rootNode;
-	for (uint8_t i=0; i<modules_count && ret == false; i++) {
-		ret = node->cb->setup(setup, j);
-		node = node->next;
+	PluggableUSBModule* node;
+	for (node = rootNode; node; node = node->next) {
+		if (node->setup(setup)) {
+			return true;
+		}
 	}
-	return ret;
+	return false;
 }
 
-int8_t PUSB_AddFunction(PUSBListNode *node, uint8_t* interface)
+bool PluggableUSB_::plug(PluggableUSBModule *node)
 {
-	if (modules_count >= MAX_MODULES) {
-		return 0;
+	if ((lastEp + node->numEndpoints) > USB_ENDPOINTS) {
+		return false;
 	}
 
-	if (modules_count == 0) {
+	if (!rootNode) {
 		rootNode = node;
 	} else {
-		PUSBListNode *current = rootNode;
-		while(current->next != NULL) {
+		PluggableUSBModule *current = rootNode;
+		while (current->next) {
 			current = current->next;
 		}
 		current->next = node;
 	}
 
-	*interface = lastIf;
-	lastIf += node->cb->numInterfaces;
-	for ( uint8_t i = 0; i< node->cb->numEndpoints; i++) {
-		EndPoints[lastEp] = node->cb->endpointType[i];
+	node->pluggedInterface = lastIf;
+	node->pluggedEndpoint = lastEp;
+	lastIf += node->numInterfaces;
+	for (uint8_t i = 0; i < node->numEndpoints; i++) {
+		EndPoints[lastEp] = node->endpointType[i];
 		lastEp++;
 	}
-	modules_count++;
-	return lastEp - node->cb->numEndpoints;
+	return true;
 	// restart USB layer???
 }
 
+PluggableUSB_& PluggableUSB()
+{
+	static PluggableUSB_ obj;
+	return obj;
+}
+
+PluggableUSB_::PluggableUSB_() : lastIf(CDC_ACM_INTERFACE + CDC_INTERFACE_COUNT),
+                                 lastEp(CDC_FIRST_ENDPOINT + CDC_ENPOINT_COUNT),
+                                 rootNode(NULL)
+{
+	// Empty
+}
+
+#endif
 #endif

hardware/arduino/sam/cores/arduino/USB/PluggableUSB.h

@@ -25,30 +25,47 @@
 
 #if defined(USBCON)
 
-typedef struct __attribute__((packed))
-{
-  bool (*setup)(USBSetup& setup, uint8_t i);
-  int (*getInterface)(uint8_t* interfaceNum);
-  int (*getDescriptor)(int8_t t);
-  int8_t numEndpoints;
-  int8_t numInterfaces;
-  uint32_t *endpointType;
-} PUSBCallbacks;
-
-class PUSBListNode {
+class PluggableUSBModule {
 public:
-  PUSBListNode *next = NULL;
-  PUSBCallbacks *cb;
-  PUSBListNode(PUSBCallbacks *ncb) {cb = ncb;}
-};
+  PluggableUSBModule(uint8_t numEps, uint8_t numIfs, uint32_t *epType) :
+    numEndpoints(numEps), numInterfaces(numIfs), endpointType(epType)
+  { }
+
+protected:
+  virtual bool setup(USBSetup& setup) = 0;
+  virtual int getInterface(uint8_t* interfaceCount) = 0;
+  virtual int getDescriptor(USBSetup& setup) = 0;
+
+  uint8_t pluggedInterface;
+  uint8_t pluggedEndpoint;
+
+  const uint8_t numEndpoints;
+  const uint8_t numInterfaces;
+  const uint32_t *endpointType;
 
-int8_t PUSB_AddFunction(PUSBListNode *node, uint8_t *interface);
+  PluggableUSBModule *next = NULL;
 
-int PUSB_GetInterface(uint8_t* interfaceNum);
+  friend class PluggableUSB_;
+};
+
+class PluggableUSB_ {
+public:
+  PluggableUSB_();
+  bool plug(PluggableUSBModule *node);
+  int getInterface(uint8_t* interfaceCount);
+  int getDescriptor(USBSetup& setup);
+  bool setup(USBSetup& setup);
 
-int PUSB_GetDescriptor(int8_t t);
+private:
+  uint8_t lastIf;
+  uint8_t lastEp;
+  PluggableUSBModule* rootNode;
+};
 
-bool PUSB_Setup(USBSetup& setup, uint8_t i);
+// Replacement for global singleton.
+// This function prevents static-initialization-order-fiasco
+// https://isocpp.org/wiki/faq/ctors#static-init-order-on-first-use
+PluggableUSB_& PluggableUSB();
 
 #endif
 

hardware/arduino/sam/cores/arduino/USB/USBCore.cpp

@@ -296,7 +296,7 @@ bool USBD_ClassInterfaceRequest(USBSetup& setup)
 #endif
 
 #ifdef PLUGGABLE_USB_ENABLED
-	return PUSB_Setup(setup, i);
+	return PluggableUSB().setup(setup);
 #endif
 
 	return false;
@@ -311,7 +311,7 @@ int USBD_SendInterfaces(void)
 #endif
 
 #ifdef PLUGGABLE_USB_ENABLED
-	PUSB_GetInterface(&interfaces);
+	PluggableUSB().getInterface(&interfaces);
 #endif
 
 	TRACE_CORE(printf("=> USBD_SendInterfaces, interfaces=%d\r\n", interfaces);)
@@ -327,7 +327,7 @@ int USBD_SendOtherInterfaces(void)
 #endif
 
 #ifdef PLUGGABLE_USB_ENABLED
-	PUSB_GetInterface(&interfaces);
+	PluggableUSB().getInterface(&interfaces);
 #endif
 
 	TRACE_CORE(printf("=> USBD_SendInterfaces, interfaces=%d\r\n", interfaces);)
@@ -399,7 +399,7 @@ static bool USBD_SendDescriptor(USBSetup& setup)
 	USBD_InitControl(setup.wLength);
 
 #ifdef PLUGGABLE_USB_ENABLED
-	ret = PUSB_GetDescriptor(t);
+	ret = PluggableUSB().getDescriptor(setup);
 	if (ret != 0) {
 		return (ret > 0 ? true : false);
 	}

hardware/arduino/sam/cores/arduino/USB/USBCore.h

@@ -46,8 +46,9 @@
 #define REQUEST_OTHER				0x03
 #define REQUEST_RECIPIENT			0x1F
 
-#define REQUEST_DEVICETOHOST_CLASS_INTERFACE  (REQUEST_DEVICETOHOST + REQUEST_CLASS + REQUEST_INTERFACE)
-#define REQUEST_HOSTTODEVICE_CLASS_INTERFACE  (REQUEST_HOSTTODEVICE + REQUEST_CLASS + REQUEST_INTERFACE)
+#define REQUEST_DEVICETOHOST_CLASS_INTERFACE    (REQUEST_DEVICETOHOST | REQUEST_CLASS | REQUEST_INTERFACE)
+#define REQUEST_HOSTTODEVICE_CLASS_INTERFACE    (REQUEST_HOSTTODEVICE | REQUEST_CLASS | REQUEST_INTERFACE)
+#define REQUEST_DEVICETOHOST_STANDARD_INTERFACE (REQUEST_DEVICETOHOST | REQUEST_STANDARD | REQUEST_INTERFACE)
 
 //	Class requests
 
@@ -91,6 +92,8 @@
 #define USB_ENDPOINT_OUT(addr)                 ((addr) | 0x00)
 #define USB_ENDPOINT_IN(addr)                  ((addr) | 0x80)
 
+#define USB_ENDPOINTS 							7
+
 #define USB_ENDPOINT_TYPE_MASK                 0x03
 #define USB_ENDPOINT_TYPE_CONTROL              0x00
 #define USB_ENDPOINT_TYPE_ISOCHRONOUS          0x01