From bfb86b6c2ac84c691c150e20adcc1b77d57efd10 Mon Sep 17 00:00:00 2001
From: AJM <poslathian@poslathian.(none)>
Date: Tue, 20 Apr 2010 14:35:58 -0400
Subject: finished the entire low level usb app for virtual com minus the
 precise handling of get/send data callbacks and toggle line state. completely
 undebugged for now.

---
 core/usb/usb_hardware.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 core/usb/usb_hardware.c

(limited to 'core/usb/usb_hardware.c')

diff --git a/core/usb/usb_hardware.c b/core/usb/usb_hardware.c
new file mode 100644
index 0000000..10918ca
--- /dev/null
+++ b/core/usb/usb_hardware.c
@@ -0,0 +1,132 @@
+/* *****************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 LeafLabs LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ * ****************************************************************************/
+
+/**
+ *  @file hardware.c
+ *
+ *  @brief init routines to setup clocks and interrupts for usb.
+ *
+ */
+
+#include "hardware.h"
+
+void setPin(u32 bank, u8 pin) {
+  u32 pinMask = 0x1 << (pin);
+  SET_REG(GPIO_BSRR(bank),pinMask);
+}
+
+void resetPin(u32 bank, u8 pin) {
+  u32 pinMask = 0x1 << (16+pin);
+  SET_REG(GPIO_BSRR(bank),pinMask);
+}
+
+void systemReset(void) {
+  SET_REG(RCC_CR, GET_REG(RCC_CR)     | 0x00000001);
+  SET_REG(RCC_CFGR, GET_REG(RCC_CFGR) & 0xF8FF0000);
+  SET_REG(RCC_CR, GET_REG(RCC_CR)     & 0xFEF6FFFF);
+  SET_REG(RCC_CR, GET_REG(RCC_CR)     & 0xFFFBFFFF);
+  SET_REG(RCC_CFGR, GET_REG(RCC_CFGR) & 0xFF80FFFF);
+
+  SET_REG(RCC_CIR, 0x00000000);  /* disable all RCC interrupts */
+}
+
+void setupCLK (void) {
+  /* enable HSE */
+  SET_REG(RCC_CR,GET_REG(RCC_CR) | 0x00010001);
+  while ((GET_REG(RCC_CR) & 0x00020000) == 0); /* for it to come on */
+  
+  /* enable flash prefetch buffer */
+  SET_REG(FLASH_ACR, 0x00000012);
+
+  /* Configure PLL */
+  SET_REG(RCC_CFGR,GET_REG(RCC_CFGR) | 0x001D0400);  /* pll=72Mhz,APB1=36Mhz,AHB=72Mhz */
+  SET_REG(RCC_CR,GET_REG(RCC_CR)     | 0x01000000);  /* enable the pll */
+  while ((GET_REG(RCC_CR) & 0x03000000) == 0);         /* wait for it to come on */
+  
+  /* Set SYSCLK as PLL */
+  SET_REG(RCC_CFGR,GET_REG(RCC_CFGR) | 0x00000002);
+  while ((GET_REG(RCC_CFGR) & 0x00000008) == 0); /* wait for it to come on */
+}
+
+
+void nvicInit(NVIC_InitTypeDef* NVIC_InitStruct) {
+  u32 tmppriority = 0x00;
+  u32 tmpreg      = 0x00;
+  u32 tmpmask     = 0x00;
+  u32 tmppre      = 0;
+  u32 tmpsub      = 0x0F;
+
+  SCB_TypeDef* rSCB = (SCB_TypeDef *) SCB_BASE;
+  NVIC_TypeDef* rNVIC = (NVIC_TypeDef *) NVIC_BASE;
+
+
+  /* Compute the Corresponding IRQ Priority --------------------------------*/    
+  tmppriority = (0x700 - (rSCB->AIRCR & (u32)0x700))>> 0x08;
+  tmppre = (0x4 - tmppriority);
+  tmpsub = tmpsub >> tmppriority;
+  
+  tmppriority = (u32)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
+  tmppriority |=  NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub;
+
+  tmppriority = tmppriority << 0x04;
+  tmppriority = ((u32)tmppriority) << ((NVIC_InitStruct->NVIC_IRQChannel & (u8)0x03) * 0x08);
+    
+  tmpreg = rNVIC->IPR[(NVIC_InitStruct->NVIC_IRQChannel >> 0x02)];
+  tmpmask = (u32)0xFF << ((NVIC_InitStruct->NVIC_IRQChannel & (u8)0x03) * 0x08);
+  tmpreg &= ~tmpmask;
+  tmppriority &= tmpmask;  
+  tmpreg |= tmppriority;
+
+  rNVIC->IPR[(NVIC_InitStruct->NVIC_IRQChannel >> 0x02)] = tmpreg;
+    
+  /* Enable the Selected IRQ Channels --------------------------------------*/
+  rNVIC->ISER[(NVIC_InitStruct->NVIC_IRQChannel >> 0x05)] =
+    (u32)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (u8)0x1F);
+}
+
+void nvicDisableInterrupts() {
+  NVIC_TypeDef* rNVIC = (NVIC_TypeDef *) NVIC_BASE;
+  rNVIC->ICER[0] = 0xFFFFFFFF;
+  rNVIC->ICER[1] = 0xFFFFFFFF;
+  rNVIC->ICPR[0] = 0xFFFFFFFF;
+  rNVIC->ICPR[1] = 0xFFFFFFFF;
+
+  SET_REG(STK_CTRL,0x04); /* disable the systick, which operates separately from nvic */
+}
+
+void systemHardReset(void) {
+  SCB_TypeDef* rSCB = (SCB_TypeDef *) SCB_BASE;
+  typedef void (*funcPtr)(void);
+  
+  /* Reset  */
+  rSCB->AIRCR = (u32)AIRCR_RESET_REQ;
+
+  /*  should never get here */
+  while (1) {
+    asm volatile("nop");
+  }
+}
+
+
+
-- 
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