Integrated MK22FN512xx USB VCOM driver with stdio system

meson.build

@@ -128,7 +128,7 @@ mk22fn512_src = ['platform/mcu/MK22FN512xxx12/boot/startup.c',
                  'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_descriptor.c',
                  'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_khci.c',
                  'platform/mcu/MK22FN512xxx12/drivers/usb/usb_osa_bm.c',
-                 'platform/mcu/MK22FN512xxx12/drivers/virtual_com.c',
+                 'platform/mcu/MK22FN512xxx12/drivers/usb_vcom.c',
                  'platform/mcu/CMSIS/Device/NXP/MK22FN512xxx12/Source/system_MK22F51212.c',
                  'rtos/uC-OS3/Ports/ARM-Cortex-M/ARMv7-M/os_cpu_c.c',
                  'rtos/uC-OS3/Ports/ARM-Cortex-M/ARMv7-M/os_cpu_a.s',

platform/mcu/MK22FN512xxx12/boot/libc_integration.c

@@ -24,6 +24,7 @@
 #include <sys/fcntl.h>
 #include <unistd.h>
 #include <errno.h>
+#include <usb_vcom.h>
 
 
 void pthread_mutex_unlock(){}
@@ -198,11 +199,7 @@ int _write_r(struct _reent *ptr, int fd, const void *buf, size_t cnt)
 {
     if(fd == STDOUT_FILENO || fd == STDERR_FILENO)
     {
-        //vcom_writeBlock(buf, cnt);
-        //return cnt;
-        (void) buf;
-        (void) cnt;
-        return -1;
+        return vcom_writeBlock(buf, cnt);
     }
 
     /* If fd is not stdout or stderr */
@@ -220,11 +217,8 @@ int _read_r(struct _reent *ptr, int fd, void *buf, size_t cnt)
     {
         for(;;)
         {
-            //ssize_t r = vcom_readBlock(buf, cnt);
-            //if((r < 0) || (r == (ssize_t)(cnt))) return r;
-            (void) buf;
-            (void) cnt;
-            return -1;
+            ssize_t r = vcom_readBlock(buf, cnt);
+            if((r < 0) || (r == (ssize_t)(cnt))) return r;
         }
     }
     else

platform/mcu/MK22FN512xxx12/boot/startup.c

@@ -17,10 +17,11 @@
  ***************************************************************************/
  
 
-#include <string.h>
 #include <stdio.h>
-#include "MK22F51212.h"
-#include "system_MK22F51212.h"
+#include <string.h>
+#include <usb_vcom.h>
+#include <MK22F51212.h>
+#include <system_MK22F51212.h>
 
 ///< Entry point for system bootstrap after initial configurations.
 void systemBootstrap();
@@ -83,8 +84,8 @@ void Reset_Handler()
 
     SIM->SCGC5 |= 0x3E00;   // Enable GPIO clock
 
-//     // Enable virtual com port (for stdin, stdout and stderr redirection)
-//     vcom_init();
+    // Enable virtual com port (for stdin, stdout and stderr redirection)
+    vcom_init();
 
     // Set no buffer for stdin, required to make scanf, getchar, ... working
     // correctly

platform/mcu/MK22FN512xxx12/drivers/usb_vcom.c

@@ -34,8 +34,8 @@
 #include <stdbool.h>
 #include <MK22F51212.h>
 
-#include "virtual_com.h"
 #include "usb/usb.h"
+#include "usb_vcom.h"
 #include "usb/fsl_common.h"
 #include "usb/usb_device.h"
 #include "usb/usb_device_ch9.h"
@@ -627,13 +627,21 @@ void vcom_init()
 
 ssize_t vcom_writeBlock(const void *buf, size_t len)
 {
-    memcpy(sendBuf, buf, len);
     if((cdcVcom.attach == 1) && (cdcVcom.startTransactions == 1))
     {
-        usb_status_t st = USB_DeviceSendRequest(cdcVcom.deviceHandle,
-                                                USB_CDC_VCOM_BULK_IN_ENDPOINT,
-                                                sendBuf, len);
-        if(st != kStatus_USB_Success) return -1;
+        uint32_t bytesToSend = len;
+        while(bytesToSend > 0)
+        {
+            uint32_t xFerLen = (bytesToSend > FS_CDC_VCOM_BULK_OUT_PACKET_SIZE)
+                             ? FS_CDC_VCOM_BULK_OUT_PACKET_SIZE : bytesToSend;
+
+            memcpy(sendBuf, buf, xFerLen);
+            usb_status_t st = USB_DeviceSendRequest(cdcVcom.deviceHandle,
+                                                  USB_CDC_VCOM_BULK_IN_ENDPOINT,
+                                                  sendBuf, xFerLen);
+            if(st != kStatus_USB_Success) return -1;
+            bytesToSend -= xFerLen;
+        }
     }
 
     return len;