Initial USB debug changes

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2187 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/stm32/stm32_rcc.c

@@ -145,6 +145,22 @@ static inline void rcc_enableapb1(void)
 {
   uint32 regval;
 
+#if CONFIG_STM32_USB
+  /* USB clock divider. This bit must be valid before enabling the USB
+   * clock in the RCC_APB1ENR register. This bit can’t be reset if the USB
+   * clock is enabled.
+   */
+
+  regval  = getreg32(STM32_RCC_CFGR);
+  regval &= ~RCC_CFGR_USBPRE;
+  regval |= STM32_CFGR_USBPRE;
+  putreg32(regval, STM32_RCC_CFGR);
+#endif
+
+  /* Set the appropriate bits in the APB1ENR register to enabled the
+   * selected APB1 peripherals.
+   */
+
   regval  = getreg32(STM32_RCC_APB1ENR);
 #if CONFIG_STM32_TIM2
   /* Timer 2 clock enable */
@@ -266,21 +282,16 @@ static inline void rcc_enableapb1(void)
   regval |= RCC_APB1ENR_DACEN;
 #endif
   putreg32(regval, STM32_RCC_APB1ENR);
-
-#if CONFIG_STM32_USB
-  /* USB clock divider */
-
-  regval  = getreg32(STM32_RCC_CFGR);
-  regval &= ~RCC_CFGR_USBPRE;
-  regval |= STM32_CFGR_USBPRE;
-  putreg32(regval, STM32_RCC_CFGR);
-#endif
 }
 
 static inline void rcc_enableapb2(void)
 {
   uint32 regval;
 
+  /* Set the appropriate bits in the APB2ENR register to enabled the
+   * selected APB2 peripherals.
+   */
+
   /* Enable GPIOA, GPIOB, ... and AFIO clocks */
 
   regval = getreg32(STM32_RCC_APB2ENR);

arch/arm/src/stm32/stm32_rcc.h

@@ -153,6 +153,7 @@
 #  define RCC_CFGR_PLLMUL_CLKx14    (12 << RCC_CFGR_PLLMUL_SHIFT) /* 1100: PLL input clock x 14 */
 #  define RCC_CFGR_PLLMUL_CLKx15    (13 << RCC_CFGR_PLLMUL_SHIFT) /* 1101: PLL input clock x 15 */
 #  define RCC_CFGR_PLLMUL_CLKx16    (14 << RCC_CFGR_PLLMUL_SHIFT) /* 111x: PLL input clock x 16 */
+#define RCC_CFGR_USBPRE             (1 << 22) /* Bit 22: USB prescaler */
 #define RCC_CFGR_MCO_SHIFT          (24)      /* Bits 26-24: Microcontroller Clock Output */
 #define RCC_CFGR_MCO_MASK           (7 << RCC_CFGR_MCO_SHIFT)
 #  define RCC_CFGR_NOCLK            (0 << RCC_CFGR_MCO_SHIFT) /* 0xx: No clock */
@@ -160,7 +161,6 @@
 #  define RCC_CFGR_INTCLK           (5 << RCC_CFGR_MCO_SHIFT) /* 101: Internal 8 MHz RC oscillator clock selected */
 #  define RCC_CFGR_EXTCLK           (6 << RCC_CFGR_MCO_SHIFT) /* 110: External 1-25 MHz oscillator clock selected */
 #  define RCC_CFGR_PLLCLKd2         (7 << RCC_CFGR_MCO_SHIFT) /* 111: PLL clock divided by 2 selected */
-#define RCC_CFGR_USBPRE             (1 << 22) /* Bit 22: USB prescaler */
 
 /* Clock interrupt register */
 

arch/arm/src/stm32/stm32_usbdev.c

@@ -335,9 +335,11 @@ struct stm32_usbdev_s
 #if defined(CONFIG_STM32_USBDEV_REGDEBUG) && defined(CONFIG_DEBUG)
 static uint16 stm32_getreg(uint32 addr);
 static void stm32_putreg(uint16 val, uint32 addr);
+static void stm32_checksetup(void);
 #else
 # define stm32_getreg(addr)     getreg16(addr)
 # define stm32_putreg(val,addr) putreg16(val,addr)
+# define stm32_checksetup()
 #endif
 
 /* Low-Level Helpers ********************************************************/
@@ -566,6 +568,27 @@ static void stm32_putreg(uint16 val, uint32 addr)
 }
 #endif
 
+/****************************************************************************
+ * Name: stm32_checksetup
+ ****************************************************************************/
+
+#if defined(CONFIG_STM32_USBDEV_REGDEBUG) && defined(CONFIG_DEBUG)
+static void stm32_checksetup(void)
+{
+  uint32 cfgr = getreg32(STM32_RCC_CFGR);
+  uint32 apb1rstr = getreg32(STM32_RCC_APB1RSTR);
+  uint32 apb1enr  = getreg32(STM32_RCC_APB1ENR);
+
+  lldbg("CFGR: %08x APB1RSTR: %08x APB1ENR: %08x\n", cfgr, apb1rstr, apb1enr);
+
+  if ((apb1rstr & RCC_APB1RSTR_USBRST) != 0 ||
+      (apb1enr & RCC_APB1ENR_USBEN) == 0)
+    {
+      lldbg("ERROR: USB is NOT setup correctly\n");
+    }
+}
+#endif
+
 /****************************************************************************
  * Low-Level Helpers
  ****************************************************************************/
@@ -1106,7 +1129,7 @@ static int stm32_wrrequest(struct stm32_usbdev_s *priv, struct stm32_ep_s *prive
   bytesleft         = privreq->req.len - privreq->req.xfrd;
   nbytes            = bytesleft;
 
-#warning REVISIT... If the EP supports double buffering, then we can do better
+#warning "REVISIT: If the EP supports double buffering, then we can do better"
 
   /* Send the next packet */
 
@@ -2440,6 +2463,7 @@ static int stm32_epconfigure(struct usbdev_ep_s *ep,
       break;
 
     case USB_EP_ATTR_XFER_ISOC: /* Isochronous endpoint */
+#warning "REVISIT: Need to review isochronous EP setup"
       setting = USB_EPR_EPTYPE_ISOC;
       break;
 
@@ -2456,7 +2480,7 @@ static int stm32_epconfigure(struct usbdev_ep_s *ep,
 
   /* Get the address of the PMA buffer allocated for this endpoint */
 
-#warning "Should configure BULK EPs using double buffer feature"
+#warning "REVISIT: Should configure BULK EPs using double buffer feature"
   pma = STM32_BUFNO2BUF(privep->bufno);
 
   /* Get the maxpacket size of the endpoint. */
@@ -2877,7 +2901,7 @@ static struct usbdev_ep_s *stm32_allocep(struct usbdev_s *dev, ubyte epno,
 
   /* Allocate a PMA buffer for this endpoint */
 
-#warning "Should configure BULK EPs using double buffer feature"
+#warning "REVISIT: Should configure BULK EPs using double buffer feature"
   bufno = stm32_allocpma(priv);
   if (bufno < 0)
     {
@@ -3134,6 +3158,7 @@ void up_usbinitialize(void)
   int epno;
 
   usbtrace(TRACE_DEVINIT, 0);
+  stm32_checksetup();
 
   /* Disable the USB controller, disable all USB interrupts */