add tusbd_cdc_is_busy

enhance cdc serial device demo
refractor fifo.c

1 files changed, 27 insertions, 15 deletions

diff --git a/demos/device/device_os_none/cdcd_app.c b/demos/device/device_os_none/cdcd_app.c
index 43299cd5a..483312975 100644
--- a/demos/device/device_os_none/cdcd_app.c
+++ b/demos/device/device_os_none/cdcd_app.c
@@ -39,6 +39,9 @@
 #include "cdcd_app.h"

 

 #if TUSB_CFG_DEVICE_CDC

+

+#include "common/fifo.h" // TODO refractor

+

 //--------------------------------------------------------------------+

 // INCLUDE

 //--------------------------------------------------------------------+

@@ -54,18 +57,16 @@ OSAL_SEM_DEF(cdcd_semaphore);
 

 static osal_semaphore_handle_t sem_hdl;

 

-static uint8_t cdcd_app_recv_buffer[CDCD_APP_BUFFER_SIZE] TUSB_CFG_ATTR_USBRAM;

-static uint8_t cdcd_app_send_buffer[CDCD_APP_BUFFER_SIZE] TUSB_CFG_ATTR_USBRAM;

-

-static uint16_t received_bytes; // set by transfer complete callback

+static uint8_t serial_rx_buffer[CDCD_APP_BUFFER_SIZE] TUSB_CFG_ATTR_USBRAM;

+static uint8_t serial_tx_buffer[CDCD_APP_BUFFER_SIZE] TUSB_CFG_ATTR_USBRAM;

 

 //--------------------------------------------------------------------+

 // INTERNAL OBJECT & FUNCTION DECLARATION

 //--------------------------------------------------------------------+

+FIFO_DEF(fifo_serial, CDCD_APP_BUFFER_SIZE, uint8_t, true);

 

 //--------------------------------------------------------------------+

 // IMPLEMENTATION

-//--------------------------------------------------------------------+

 void cdcd_serial_app_init(void)

 {

   sem_hdl = osal_semaphore_create( OSAL_SEM_REF(cdcd_semaphore) );

@@ -78,8 +79,7 @@ void tusbd_cdc_mounted_cb(uint8_t coreid)
 {

   osal_semaphore_reset(sem_hdl);

 

-  received_bytes = 0;

-  tusbd_cdc_receive(coreid, cdcd_app_recv_buffer, CDCD_APP_BUFFER_SIZE, true);

+  tusbd_cdc_receive(coreid, serial_rx_buffer, CDCD_APP_BUFFER_SIZE, true);

 }

 

 void tusbd_cdc_xfer_isr(uint8_t coreid, tusb_event_t event, cdc_pipeid_t pipe_id, uint32_t xferred_bytes)

@@ -90,9 +90,12 @@ void tusbd_cdc_xfer_isr(uint8_t coreid, tusb_event_t event, cdc_pipeid_t pipe_id
       switch(event)

       {

         case TUSB_EVENT_XFER_COMPLETE:

-          received_bytes = min16_of(xferred_bytes, CDCD_APP_BUFFER_SIZE); // discard overflow bytes

+          for(uint8_t i=0; i<xferred_bytes; i++)

+          {

+            fifo_write(&fifo_serial, serial_rx_buffer+i);

+          }

           osal_semaphore_post(sem_hdl);  // notify main task

-          break;

+        break;

 

         case TUSB_EVENT_XFER_ERROR:

           xferred_bytes = 0; // ignore

@@ -122,14 +125,23 @@ OSAL_TASK_FUNCTION( cdcd_serial_app_task ) (void* p_task_para)
 

   if ( tusbd_cdc_is_configured(0) )

   {

-    if ( received_bytes )

-    { // echo back

-      memcpy(cdcd_app_send_buffer, cdcd_app_recv_buffer, received_bytes);

-      tusbd_cdc_send(0, cdcd_app_send_buffer, received_bytes, false);

-      received_bytes = 0;

+    // echo back data in the fifo

+    if ( !tusbd_cdc_is_busy(0, CDC_PIPE_DATA_IN) )

+    {

+      uint16_t count=0;

+      while( fifo_read(&fifo_serial, &serial_tx_buffer[count]) )

+      {

+        count++;

+      }

+

+      if (count)

+      {

+        tusbd_cdc_send(0, serial_tx_buffer, count, false);

+      }

     }

 

-    tusbd_cdc_receive(0, cdcd_app_recv_buffer, CDCD_APP_BUFFER_SIZE, true);

+    // getting next data from host

+    tusbd_cdc_receive(0, serial_rx_buffer, CDCD_APP_BUFFER_SIZE, true);

   }

 

   OSAL_TASK_LOOP_END