main.c

最新版IAR FOR ARM（EWARM）5.11中的代码例子

/*************************************************************************
 *
 *    Used with ICCARM and AARM.
 *
 *    (c) Copyright IAR Systems 2007
 *
 *    File name   : main.c
 *    Description : Define main module
 *
 *    History :
 *    1. Date        : 18, October 2007
 *       Author      : Stanimir Bonev
 *       Description : Create
 *
 *  This example project shows how to use the IAR Embedded Workbench
 * for ARM to develop code for the IAR STM32-SK board.
 *  It implements usb audio device with one output and one input.
 *
 *  Jumpers:
 *   PWR_SEL - depending of power source
 *
 *    $Revision: 1.1.2.1 $
 **************************************************************************/
#include "includes.h"

#define LOOP_DLY_100US  450

Int32U CriticalSecCntr;

/*************************************************************************
 * Function Name: Clk_Init
 * Parameters: Int32U Frequency
 * Return: Int32U
 *
 * Description: Init clock system
 *
 *************************************************************************/
void Clk_Init (void)
{
  // 1. Clocking the controller from internal HSI RC (8 MHz)
  RCC_HSICmd(ENABLE);
  // wait until the HSI is ready
  while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);
  RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
  // 2. Enable ext. high frequency OSC
  RCC_HSEConfig(RCC_HSE_ON);
  // wait until the HSE is ready
  while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);
  // 3. Init PLL
  RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9); // 72MHz
  RCC_PLLCmd(ENABLE);
  // wait until the PLL is ready
  while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
  // 4. Set system clock dividers
  RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
  RCC_ADCCLKConfig(RCC_PCLK2_Div8);
  RCC_PCLK2Config(RCC_HCLK_Div1);
  RCC_PCLK1Config(RCC_HCLK_Div2);
  RCC_HCLKConfig(RCC_SYSCLK_Div1);
#ifdef EMB_FLASH
  // 5. Init Embedded Flash
  // Zero wait state, if 0 < HCLK 24 MHz
  // One wait state, if 24 MHz < HCLK 56 MHz
  // Two wait states, if 56 MHz < HCLK 72 MHz
  // Flash wait state
  FLASH_SetLatency(FLASH_Latency_2);
  // Half cycle access
  FLASH_HalfCycleAccessCmd(FLASH_HalfCycleAccess_Disable);
  // Prefetch buffer
  FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
#endif // EMB_FLASH
  // 5. Clock system from PLL
  RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
}

/*************************************************************************
 * Function Name: Dly100us
 * Parameters: Int32U Dly
 *
 * Return: none
 *
 * Description: Delay Dly * 100us
 *
 *************************************************************************/
void Dly100us(void *arg)
{
Int32U Dly = (Int32U)arg;
  while(Dly--)
  {
    for(volatile int i = LOOP_DLY_100US; i; i--);
  }
}

/*************************************************************************
 * Function Name: main
 * Parameters: none
 *
 * Return: none
 *
 * Description: main
 *
 *************************************************************************/
void main(void)
{
#ifdef DEBUG
  debug();
#endif
    
  ENTR_CRT_SECTION();

  // Init clock system
  Clk_Init();

  // NVIC init
#ifndef  EMB_FLASH
  /* Set the Vector Table base location at 0x20000000 */
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);

  // Audio Device Class
  UsbAudioClassInit();

  // Soft connection enable
  USB_ConnectRes(TRUE);

  EXT_CRT_SECTION();

  // LCD Init
  HD44780_PowerUpInit();

  // Backlight On
  LCD_LIGHT_ON();
  // Show messages on LCD
  HD44780_StrShow(1, 1,  "  IAR Systems   ");
  HD44780_StrShow(1, 2,  "Audio dev. class");

  while(1)
  {
  }
}
#ifdef  DEBUG
/*******************************************************************************
* Function Name  : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert_param error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert_param error line source number
* Output         : None
* Return         : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif