diff --git a/cdc_app.c b/cdc_app.c
index fac6649..3b4ac43 100644
--- a/cdc_app.c
+++ b/cdc_app.c
@@ -61,6 +61,16 @@ void cdc_app_task(void) {
       }
     }
   }
+  for (uint8_t idx = 0; idx < CFG_TUH_CDC; idx++) {
+    if (tuh_cdc_mounted(idx)) {
+      char chaine[1024];
+      log_get(idx, chaine);
+      if(strlen(chaine)> 0){
+        printf("%s", chaine);
+      }
+    }
+  }
+
 }
 
 //--------------------------------------------------------------------+
@@ -73,33 +83,16 @@ void tuh_cdc_rx_cb(uint8_t idx) {
     printf("already processing data\n");
     return;
   }
-
-  absolute_time_t current_time_us, start_time_us;
-	
-	start_time_us = get_absolute_time();
-
   in_transfert_cb = 1;
   uint8_t buf[64 + 1]; // +1 for extra null character
-  char chaine[1024];
   uint32_t const bufsize = sizeof(buf) - 1;
 
   // forward cdc interfaces -> console
   uint32_t count = tuh_cdc_read(idx, buf, bufsize);
   buf[count] = 0;
 
-  log_analyse_input_string(buf, count);
-  log_get(chaine);
-
-  
-
-  current_time_us = get_absolute_time();
-  if(strlen(chaine)> 0){
-    printf("%s", chaine);
-    printf(">temp_rec:%d\n", current_time_us);
-    chaine[0] = '\0';
-  }
-
 
+  log_analyse_input_string(idx, buf, count);
   in_transfert_cb = 0;
 }
 
@@ -111,6 +104,7 @@ void tuh_cdc_mount_cb(uint8_t idx) {
 
   printf("CDC Interface is mounted: address = %u, itf_num = %u\r\n", itf_info.daddr,
          itf_info.desc.bInterfaceNumber);
+  log_create(idx);
 
 #ifdef CFG_TUH_CDC_LINE_CODING_ON_ENUM
   // If CFG_TUH_CDC_LINE_CODING_ON_ENUM is defined, line coding will be set by tinyusb stack
@@ -134,4 +128,6 @@ void tuh_cdc_umount_cb(uint8_t idx) {
 
   printf("CDC Interface is unmounted: address = %u, itf_num = %u\r\n", itf_info.daddr,
          itf_info.desc.bInterfaceNumber);
+
+  log_destroy(idx);
 }
diff --git a/log_usb.c b/log_usb.c
index 4ce009d..0f2cec2 100644
--- a/log_usb.c
+++ b/log_usb.c
@@ -1,27 +1,76 @@
 #include <string.h>
+#include "pico/platform/panic.h"
 
-char tampon[1020];
-char log_dispo[1020]={'\0'};
-unsigned int index_tampon=0;
+#define NB_MAX_CDC_CONNEXION 10
+#define INVALID_ID  ((char)-1)
 
-void log_analyse_input_string(const char * input_data, unsigned int str_len){
+struct log_buffer_t{
+    char idx;
+    char copy_active;
+    char tampon[1020];
+    char log_dispo[1020];
+    unsigned int index_tampon;
+}log_buffer[10];
+
+static struct log_buffer_t * get_buffer(const char idx);
+
+static struct log_buffer_t * get_buffer(const char idx){
+    for (int i=0; i<NB_MAX_CDC_CONNEXION; i++){
+        if(log_buffer[i].idx == idx){
+            return &(log_buffer[i]);
+        }
+    }
+    /// TODO: panic ?
+    panic("Buffer IDX not found: %d\n", idx);
+    return NULL;
+}
+
+/// @brief Initialisation des structure de reception des données USB-CDC
+void log_init(){
+    for (int i=0; i<NB_MAX_CDC_CONNEXION; i++){
+        log_buffer[i].log_dispo[0] = '\0';
+        log_buffer[i].index_tampon = 0;
+        log_buffer[i].copy_active = 0;
+        log_buffer[i].idx = INVALID_ID;
+    }
+}
+
+/// @brief Affectation des tampons de reception à une liaison USB-CDC
+/// @param idx : 
+void log_create(const char idx){
+    for (int i=0; i<NB_MAX_CDC_CONNEXION; i++){
+        if(log_buffer[i].idx == INVALID_ID){
+            log_buffer[i].idx = idx;
+            return;
+        }
+    }
+    panic("Creation impossible: idx: %d\n", idx);
+}
+
+void log_destroy(const char idx){
+    struct log_buffer_t * p_log_bufffer;
+    p_log_bufffer = get_buffer(idx);
+    p_log_bufffer->idx = INVALID_ID;
+}
+
+void log_analyse_input_string(const char idx, const char * input_data, unsigned int str_len){
     // On charge les données dans le tampon
     // Si on a un message complet, on charge dans log dispo (s'il y a la place)
-    static int copy = 0;
+    struct log_buffer_t * p_log_bufffer;
+    p_log_bufffer = get_buffer(idx);
     for(int i=0; i< str_len; i++){
         if(input_data[i] == '>'){
-            copy = 1;
+            p_log_bufffer->copy_active = 1;
         }
-        if(copy == 1){
-            tampon[index_tampon] = input_data[i];
-            index_tampon++;
-
+        if(p_log_bufffer->copy_active == 1){
+            p_log_bufffer->tampon[p_log_bufffer->index_tampon] = input_data[i];
+            p_log_bufffer->index_tampon++;
 
             if(input_data[i] == '\n'){
-                copy = 0;
-                tampon[index_tampon] = '\0';
-                strcat(log_dispo, tampon);
-                index_tampon=0;
+                p_log_bufffer->copy_active = 0;
+                p_log_bufffer->tampon[p_log_bufffer->index_tampon] = '\0';
+                strcat(p_log_bufffer->log_dispo, p_log_bufffer->tampon);
+                p_log_bufffer->index_tampon=0;
             }
         }
         
@@ -29,9 +78,16 @@ void log_analyse_input_string(const char * input_data, unsigned int str_len){
 }
 
 // On renvoi la chaine et on remet log_dispo à 0;
-void log_get(char * chaine){
-    strcpy(chaine, log_dispo);
-    log_dispo[0] = '\0';
+void log_get(const char idx, char * chaine){
+    struct log_buffer_t * p_log_bufffer;
+    p_log_bufffer = get_buffer(idx);
+    if(p_log_bufffer == NULL){
+        chaine[0] = '\0';
+        return;
+    }
+
+    strcpy(chaine, p_log_bufffer->log_dispo);
+    p_log_bufffer->log_dispo[0] = '\0';
 }
 
 
diff --git a/log_usb.h b/log_usb.h
index ccdc512..b4f707c 100644
--- a/log_usb.h
+++ b/log_usb.h
@@ -1,2 +1,6 @@
-void log_analyse_input_string(char * input_data, unsigned int str_len);
-void log_get(char * chaine);
\ No newline at end of file
+
+void log_init(void);
+void log_create(const char idx);
+void log_destroy(const char idx);
+void log_analyse_input_string(const char idx, char * input_data, unsigned int str_len);
+void log_get(const char idx, char * chaine);
\ No newline at end of file
diff --git a/main.c b/main.c
index 61bfa2d..817f5fe 100644
--- a/main.c
+++ b/main.c
@@ -32,6 +32,7 @@
 #include "tusb.h"
 #include "ff.h"
 #include "f_util.h"
+#include "log_usb.h"
 
 //--------------------------------------------------------------------+
 // MACRO CONSTANT TYPEDEF PROTYPES
@@ -109,6 +110,8 @@ int main(void) {
   printf("TinyUSB Host CDC MSC HID Example - test comparatif\r\n");
 
   // init host stack on configured roothub port
+  // à mettre avant tuh_init
+  log_init();
   tuh_init(BOARD_TUH_RHPORT);
 
   if (board_init_after_tusb) {
diff --git a/tusb_config.h b/tusb_config.h
index a59a0ff..e681ece 100644
--- a/tusb_config.h
+++ b/tusb_config.h
@@ -102,7 +102,7 @@
 #define CFG_TUH_ENUMERATION_BUFSIZE 256
 
 #define CFG_TUH_HUB                 1 // number of supported hubs
-#define CFG_TUH_CDC                 1 // CDC ACM
+#define CFG_TUH_CDC                 3 // CDC ACM
 #define CFG_TUH_CDC_FTDI            1 // FTDI Serial.  FTDI is not part of CDC class, only to re-use CDC driver API
 #define CFG_TUH_CDC_CP210X          1 // CP210x Serial. CP210X is not part of CDC class, only to re-use CDC driver API
 #define CFG_TUH_CDC_CH34X           1 // CH340 or CH341 Serial. CH34X is not part of CDC class, only to re-use CDC driver API