libraries/RPC: Support adding more endpoints, if needed.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>

Author: iabdalkader

libraries/RPC/src/RPC.cpp

@@ -2,50 +2,57 @@
 // SPDX-License-Identifier: MPL-2.0
 #include "RPC.h"
 
-#define ENDPOINT_ID_RAW     0
-#define ENDPOINT_ID_RPC     1
-
-#define MSGPACK_TYPE_REQUEST    0
-#define MSGPACK_TYPE_RESPONSE   1
-#define MSGPACK_TYPE_NOTIFY     2
+typedef struct {
+    const char *name;
+    bool ready;
+    struct rpmsg_endpoint rpmsg;
+} endpoint_t;
+
+typedef enum {
+    ENDPOINT_ID_RAW,
+    ENDPOINT_ID_RPC,
+    ENDPOINT_ID_MAX
+} endpoint_id_t;
+
+typedef enum {
+    MSGPACK_ID_REQUEST,
+    MSGPACK_ID_RESPONSE,
+    MSGPACK_ID_NOTIFY,
+} msgpack_id_t;
+
+static endpoint_t endpoints[ENDPOINT_ID_MAX] = {
+    [ENDPOINT_ID_RAW] = { .name = "raw", .ready = false, .rpmsg = { 0 } }, 
+    [ENDPOINT_ID_RPC] = { .name = "rpc", .ready = false, .rpmsg = { 0 } }, 
+};
 
 arduino::RPCClass RPC;
-
-osThreadId eventHandlerThreadId;
 static rtos::Mutex mutex;
-static struct rpmsg_endpoint endpoints[2];
-#ifdef CORE_CM4
-static bool endpoints_init[2] = { 0 };
-#endif
+osThreadId eventHandlerThreadId;
 
 void RPCClass::new_service_cb(struct rpmsg_device *rdev, const char *name, uint32_t dest) {
     uint8_t buffer[1] = {0};
-    struct rpmsg_endpoint *ept = NULL;
-
-    if (strcmp(name, "rpc") == 0) {
-        ept = &endpoints[ENDPOINT_ID_RPC];
-    } else if (strcmp(name, "raw") == 0) {
-        ept = &endpoints[ENDPOINT_ID_RAW];
-    }
-
-    if (ept) {
-        OPENAMP_create_endpoint(ept, name, dest, rpmsg_recv_callback, NULL);
-        OPENAMP_send(ept, buffer, sizeof(buffer));
+    for (size_t i=0; i<ENDPOINT_ID_MAX; i++) {
+        endpoint_t *ep = &endpoints[i];
+        if (strcmp(name, ep->name) == 0) {
+            OPENAMP_create_endpoint(&ep->rpmsg, name, dest, rpmsg_recv_callback, NULL);
+            OPENAMP_send(&ep->rpmsg, buffer, sizeof(buffer));
+            break;
+        }
     }
 }
 
 int RPCClass::rpmsg_recv_callback(struct rpmsg_endpoint *ept, void *data, size_t len, uint32_t src, void *priv) {
     #ifdef CORE_CM4
-    if (!endpoints_init[ENDPOINT_ID_RPC] && ept == &endpoints[ENDPOINT_ID_RPC]) {
-        endpoints_init[ENDPOINT_ID_RPC] = true;
-        return 0;
-    } else if (!endpoints_init[ENDPOINT_ID_RAW] && ept == &endpoints[ENDPOINT_ID_RAW]) {
-        endpoints_init[ENDPOINT_ID_RAW] = true;
-        return 0;
+    for (size_t i=0; i<ENDPOINT_ID_MAX; i++) {
+        endpoint_t *ep = &endpoints[i];
+        if (ept == &ep->rpmsg && !ep->ready) {
+            ep->ready = true;
+            return 0;
+        }
     }
     #endif
 
-    if (ept == &endpoints[ENDPOINT_ID_RAW]) {
+    if (ept == &endpoints[ENDPOINT_ID_RAW].rpmsg) {
         // data on raw endpoint
         if (RPC.raw_callback) {
             RPC.raw_callback.call((uint8_t *) data, len);
@@ -59,11 +66,11 @@ int RPCClass::rpmsg_recv_callback(struct rpmsg_endpoint *ept, void *data, size_t
 
     uint8_t msgpack_type = ((uint8_t *) data)[1];
     switch (msgpack_type) {
-        case MSGPACK_TYPE_REQUEST:
-        case MSGPACK_TYPE_NOTIFY:
+        case MSGPACK_ID_REQUEST:
+        case MSGPACK_ID_NOTIFY:
             RPC.request((uint8_t *) data, len);
             break;
-        case MSGPACK_TYPE_RESPONSE:
+        case MSGPACK_ID_RESPONSE:
             RPC.response((uint8_t *) data, len);
             break;
     }
@@ -144,15 +151,18 @@ int RPCClass::begin() {
         return 0;
     }
 
-    // Initialize rpmsg endpoints.
-    memset(endpoints, 0, sizeof(endpoints));
-
     // Boot the CM4.
     cm4_kick();
 
     // Wait for the remote to announce the services with a timeout.
-    uint32_t millis_start = millis();
-    while (endpoints[ENDPOINT_ID_RPC].rdev == NULL || endpoints[ENDPOINT_ID_RAW].rdev == NULL) {
+    for (uint32_t millis_start = millis(); ; ) {
+        size_t ep_count = 0;
+        for (size_t i=0; i<ENDPOINT_ID_MAX; i++) {
+            ep_count += (endpoints[i].rdev != NULL);
+        }
+        if (ep_count == ENDPOINT_ID_MAX) {
+            break;
+        }
         if ((millis() - millis_start) >= 5000) {
             return 0;
         }
@@ -203,20 +213,24 @@ int RPCClass::begin() {
         return 0;
     }
 
-    // Create RAW endpoint.
-    if (OPENAMP_create_endpoint(&endpoints[ENDPOINT_ID_RAW], "raw", RPMSG_ADDR_ANY, rpmsg_recv_callback, NULL) < 0) {
-        return 0;
-    }
-    
-    // Create RPC endpoint.
-    if (OPENAMP_create_endpoint(&endpoints[ENDPOINT_ID_RPC], "rpc", RPMSG_ADDR_ANY, rpmsg_recv_callback, NULL) < 0) {
-        return 0;
+    // Create endpoints.
+    for (size_t i=0; i<ENDPOINT_ID_MAX; i++) {
+        endpoint_t *ep = &endpoints[i];
+        if (OPENAMP_create_endpoint(&ep->rpmsg, ep->name, RPMSG_ADDR_ANY, rpmsg_recv_callback, NULL) < 0) {
+            return 0;
+        }
     }
 
-    // Wait for endpoints to be initialized first by the host before allowing
+    // Wait for endpoints to be ready first by the host before allowing
     // the remote to use the endpoints.
-    uint32_t millis_start = millis();
-    while (!endpoints_init[ENDPOINT_ID_RPC] || !endpoints_init[ENDPOINT_ID_RAW]) {
+    for (uint32_t millis_start = millis(); ; ) {
+        size_t ep_count = 0;
+        for (size_t i=0; i<ENDPOINT_ID_MAX; i++) {
+            ep_count += endpoints[i].ready;
+        }
+        if (ep_count == ENDPOINT_ID_MAX) {
+            break;
+        }
         if ((millis() - millis_start) >= 5000) {
             return 0;
         }
@@ -267,7 +281,8 @@ void RPCClass::request(uint8_t *buf, size_t len) {
         auto resp = rpc::detail::dispatcher::dispatch(msg, false);
         auto data = resp.get_data();
         if (!resp.is_empty()) {
-            OPENAMP_send(&endpoints[ENDPOINT_ID_RPC], data.data(), data.size());
+            endpoint_t *ep = &endpoints[ENDPOINT_ID_RPC];
+            OPENAMP_send(&ep->rpmsg, data.data(), data.size());
         }
     }
 }
@@ -282,7 +297,7 @@ void rpc::client::write(RPCLIB_MSGPACK::sbuffer *buffer) {
 
 size_t RPCClass::write(const uint8_t *buf, size_t len, bool raw) {
     mutex.lock();
-    OPENAMP_send(&endpoints[raw ? ENDPOINT_ID_RAW : ENDPOINT_ID_RPC], buf, len);
+    OPENAMP_send(&endpoints[raw ? ENDPOINT_ID_RAW : ENDPOINT_ID_RPC].rpmsg, buf, len);
     mutex.unlock();
     return len;
 }