Initial PIC32 driver -- now is just a badly hacked STM32 USB driver

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4234 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 136 insertions, 0 deletions

diff --git a/nuttx/configs/sure-pic32mx/src/up_usbdev.c b/nuttx/configs/sure-pic32mx/src/up_usbdev.c
new file mode 100644
index 000000000..5fb12b537
--- /dev/null
+++ b/nuttx/configs/sure-pic32mx/src/up_usbdev.c
@@ -0,0 +1,136 @@
+/************************************************************************************
+ * configs/sure-pic32mx/src/up_usbdev.c
+ * arch/arm/src/board/up_usbdev.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * References:
+ *   - Sample code and schematics provided with the Sure Electronics PIC32 board.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <nuttx/spi.h>
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "chip.h"
+#include "pic32mx-internal.h"
+#include "sure-internal.h"
+
+#if defined(CONFIG_PIC32MX_USBDEV)
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/*
+ * PIN  NAME                            SIGNAL         NOTES
+ * ---- ------------------------------- -------------- ------------------------------
+ *  11  AN5/C1IN+/Vbuson/CN7/RB5        Vbuson/AN5/RB5 To USB VBUS circuitry
+ *  43  U1CTS/SDA1/IC2/INT2/RD9         USB_OPTEN      USB PHY
+ *  44  SCL1/IC3/PMCS2/PMA15/INT3/RD10  USB_OPT        USB PHY
+ */
+
+#define GPIO_USB_VBUSON (GPIO_INPUT|GPIO_PORTB|GPIO_PIN5)
+#define GPIO_USB_OPTEN  (GPIO_OUTPUT|GPIO_VALUE_ZERO|GPIO_PORTD|GPIO_PIN9)
+#define GPIO_USB_OPT    (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTD|GPIO_PIN10)
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: pic32mx_usbdevinitialize
+ *
+ * Description:
+ *   Called to configure the mini-B PHY on the Sure PIC32MX board for the USB device
+ *
+ ************************************************************************************/
+
+void weak_function pic32mx_usbdevinitialize(void)
+{
+  /* Connect the PHY to the USB mini-B port.  Order and timing matter! */
+
+  pic32mx_configgpio(GPIO_USB_OPTEN);
+  pic32mx_configgpio(GPIO_USB_OPT);
+
+  /* Notes from the Sure Electronics sample code:
+   *
+   * "The USB specifications require that USB peripheral devices must never source
+   *  current onto the Vbus pin.  Additionally, USB peripherals should not source
+   *  current on D+ or D- when the host/hub is not actively powering the Vbus line.
+   *  When designing a self powered (as opposed to bus powered) USB peripheral
+   *  device, the firmware should make sure not to turn on the USB module and D+
+   *  or D- pull up resistor unless Vbus is actively powered.  Therefore, the
+   *  firmware needs some means to detect when Vbus is being powered by the host.
+   *  A 5V tolerant I/O pin can be connected to Vbus (through a resistor), and
+   *  can be used to detect when Vbus is high (host actively powering), or low
+   *  (host is shut down or otherwise not supplying power).  The USB firmware
+   *  can then periodically poll this I/O pin to know when it is okay to turn on
+   *  the USB module/D+/D- pull up resistor.  When designing a purely bus powered
+   *  peripheral device, it is not possible to source current on D+ or D- when the
+   *  host is not actively providing power on Vbus. Therefore, implementing this
+   *  bus sense feature is optional. ..."
+   */
+
+#ifdef CONFIG_USBHOST
+ // pic32mx_configgpio(GPIO_USB_VBUSON);
+#endif
+    
+  /* "If the host PC sends a GetStatus (device) request, the firmware must respond
+   *  and let the host know if the USB peripheral device is currently bus powered
+   *  or self powered.  See chapter 9 in the official USB specifications for details
+   *  regarding this request.  If the peripheral device is capable of being both
+   *  self and bus powered, it should not return a hard coded value for this request.
+   *  Instead, firmware should check if it is currently self or bus powered, and
+   *  respond accordingly.  If the hardware has been configured like demonstrated
+   *  on the PICDEM FS USB Demo Board, an I/O pin can be polled to determine the
+   *  currently selected power source. ..."
+   */
+
+#ifdef CONFIG_USB_PWRSENSE
+ // pic32mx_configgpio(GPIO_USB_PWRSENSE);
+#endif
+}
+#endif /* CONFIG_PIC32MX_USBDEV */