/**
******************************************************************************
* @file stm32f070xb.h
* @author MCD Application Team
* @brief CMSIS Cortex-M0 Device Peripheral Access Layer Header File.
* This file contains all the peripheral register's definitions, bits
* definitions and memory mapping for STM32F0xx devices.
*
* This file contains:
* - Data structures and the address mapping for all peripherals
* - Peripheral's registers declarations and bits definition
* - Macros to access peripheral’s registers hardware
*
******************************************************************************
* @attention
*
*
© COPYRIGHT(c) 2016 STMicroelectronics
*
* 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 of STMicroelectronics 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 HOLDER 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
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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*
******************************************************************************
*/
/** @addtogroup CMSIS
* @{
*/
/** @addtogroup stm32f070xb
* @{
*/
#ifndef __STM32F070xB_H
#define __STM32F070xB_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/** @addtogroup Configuration_section_for_CMSIS
* @{
*/
/**
* @brief Configuration of the Cortex-M0 Processor and Core Peripherals
*/
#define __CM0_REV 0 /*!< Core Revision r0p0 */
#define __MPU_PRESENT 0 /*!< STM32F0xx do not provide MPU */
#define __NVIC_PRIO_BITS 2 /*!< STM32F0xx uses 2 Bits for the Priority Levels */
#define __Vendor_SysTickConfig 0 /*!< Set to 1 if different SysTick Config is used */
/**
* @}
*/
/** @addtogroup Peripheral_interrupt_number_definition
* @{
*/
/**
* @brief STM32F0xx Interrupt Number Definition, according to the selected device
* in @ref Library_configuration_section
*/
/*!< Interrupt Number Definition */
typedef enum
{
/****** Cortex-M0 Processor Exceptions Numbers **************************************************************/
NonMaskableInt_IRQn = -14, /*!< 2 Non Maskable Interrupt */
HardFault_IRQn = -13, /*!< 3 Cortex-M0 Hard Fault Interrupt */
SVC_IRQn = -5, /*!< 11 Cortex-M0 SV Call Interrupt */
PendSV_IRQn = -2, /*!< 14 Cortex-M0 Pend SV Interrupt */
SysTick_IRQn = -1, /*!< 15 Cortex-M0 System Tick Interrupt */
/****** STM32F0 specific Interrupt Numbers ******************************************************************/
WWDG_IRQn //==========================================
// Function : Code Gray counter.
// Coder : Alex Claros F.
// Date : 15/May/2005.
//=======================================
module GrayCounter
#(parameter COUNTER_WIDTH = 4)
(output reg [COUNTER_WIDTH-1:0] GrayCount_out, //'Gray' code count output.
input wire Enable_in, //Count enable.
input wire Clear_in, //Count reset.
input wire Clk);
/////////Internal connections & variables///////
reg [COUNTER_WIDTH-1:0] BinaryCount;
/////////Code///////////////////////
always @ (posedge Clk)
if (Clear_in) begin
BinaryCount <= {COUNTER_WIDTH{1'b 0}} + 1; //Gray count begins @ '1' with
GrayCount_out <= {COUNTER_WIDTH{1'b 0}}; // first 'Enable_in'.
end
else if (Enable_in) begin
BinaryCount <= BinaryCount + 1;
GrayCount_out <= {BinaryCount[COUNTER_WIDTH-1],
BinaryCount[COUNTER_WIDTH-2:0] ^ BinaryCount[COUNTER_WIDTH-1:1]};
end
endmodule