void cpu_init(void) {
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
ErrorStatus HSEStartUpStatus = RCC_WaitForHSEStartUp();
if (HSEStartUpStatus == SUCCESS) {
// Enable flash buffers and prefetching
FLASH_PrefetchBufferCmd(ENABLE);
FLASH_InstructionCacheCmd(ENABLE);
FLASH_DataCacheCmd(ENABLE);
// Set startup speed
cpu_reclock(&sysclock_120m);
}
}
void CLOCK_FLASH_config()
{
// クロックの状態を初期値に戻す
RCC_DeInit();
// wait stateの設定
if (VoltageRange_x == VoltageRange_2) FLASH_SetLatency(FLASH_Latency_6);
else if(VoltageRange_x == VoltageRange_3) FLASH_SetLatency(FLASH_Latency_5);
else while(1);
// ART Acceleratorの設定
FLASH_PrefetchBufferCmd(ENABLE);
FLASH_InstructionCacheCmd(ENABLE);
FLASH_DataCacheCmd(ENABLE);
// HSIのキャリブレーション値を設定する
RCC_AdjustHSICalibrationValue(HSICalibrationValue);
// PLLの設定をする (max. 168 MHz)
// PLLM: division factor, 2-63 --> 1-2 MHz (2MHz is recommended)
// PLLN: multiplication factor, 64-432 --> 64-432 MHz
// PLLP: division factor, 2, 4, 6, or 8 --> max 168 MHz
// PLLQ: division factor, 2-15 --> 48 MHz
RCC_PLLConfig(RCC_PLLSource_HSI, 8, 168, 2, 7); // HSI / 8 * 168 / 2 = 168 MHz
//RCC_PLLConfig(RCC_PLLSource_HSI, 8, 168, 4, 7); // HSI / 8 * 168 / 4 = 84 MHz
RCC_PLLCmd(ENABLE);
while( RCC_GetFlagStatus(RCC_FLAG_PLLRDY) != SET);
// HCLKの分周比を設定する (max. 168 MHz)
RCC_HCLKConfig(RCC_SYSCLK_Div1);
// PCLK2の分周比を設定する (max. 84 MHz)
RCC_PCLK2Config(RCC_HCLK_Div2);
// PLCK1の分周比を設定する (max. 42 MHz)
RCC_PCLK1Config(RCC_HCLK_Div4);
// SYSCLKのクロックソースをPLLに切り替える
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08);
}
/**-----------------------------------------------------------------------------
* @brief Desinitialisation de la carte.
*/
void BSP_DeInit() {
// Desactivation des interruptions
__disable_irq();
// Arret Systick
SysTick->CTRL = 0;
SysTick->LOAD = 0;
SysTick->VAL = 0;
// DeInitialisation des horloges
//RCC_AHB1PeriphClockCmd(0xFFFFFFFF, DISABLE);
RCC_AHB1PeriphResetCmd(0xFFFFFFFF, ENABLE);
RCC_AHB1PeriphResetCmd(0xFFFFFFFF, DISABLE);
//RCC_AHB2PeriphClockCmd(0xFFFFFFFF, DISABLE);
RCC_AHB2PeriphResetCmd(0xFFFFFFFF, ENABLE);
RCC_AHB2PeriphResetCmd(0xFFFFFFFF, DISABLE);
//RCC_AHB3PeriphClockCmd(0xFFFFFFFF, DISABLE);
RCC_AHB3PeriphResetCmd(0xFFFFFFFF, ENABLE);
RCC_AHB3PeriphResetCmd(0xFFFFFFFF, DISABLE);
//RCC_APB1PeriphClockCmd(0xFFFFFFFF, DISABLE);
RCC_APB1PeriphResetCmd(0xFFFFFFFF, ENABLE);
RCC_APB1PeriphResetCmd(0xFFFFFFFF, DISABLE);
//RCC_APB2PeriphClockCmd(0xFFFFFFFF, DISABLE);
RCC_APB2PeriphResetCmd(0xFFFFFFFF, ENABLE);
RCC_APB2PeriphResetCmd(0xFFFFFFFF, DISABLE);
RCC_DeInit();
// ReInit Flash
FLASH_PrefetchBufferCmd(DISABLE);
FLASH_InstructionCacheCmd(DISABLE);
FLASH_DataCacheCmd(DISABLE);
}
static void prvSetupHardware( void )
{
#if 1
ErrorStatus HSEStartUpStatus;
/* RCC system reset(for debug purpose) */
RCC_DeInit(); // 将外设RCC寄存器重设为缺省值
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON); // 设置外部高速晶振（HSE）
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp(); // 等待HSE起振，该函数将等待直到HSE就绪，或者在超时的情况下退出
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(ENABLE); // 使能预取指缓存
FLASH_InstructionCacheCmd(ENABLE);
FLASH_DataCacheCmd(ENABLE);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2); // 设置代码延时值
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1); // 设置AHB时钟（HCLK）
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1); // 设置高速AHB时钟（PCLK2）
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2); // 设置低速AHB时钟（PCLK1）
/* ADCCLK = PCLK2/4 */
//RCC_ADCCLKConfig(RCC_PCLK2_Div4); // 设置ADC时钟（ADCCLK）
if(HSEStartUpStatus == SUCCESS)
{
/* PLLCLK = ((12MHz/12)*336)/4 = 84 MHz */
RCC_PLLConfig(RCC_PLLCFGR_PLLSRC_HSE, 12, 336, 4, 7); // 设置PLL时钟源及倍频系数
HSE_Or_HSI = 1;
//MsTimeTick = 84000;
}
else
{
/* PLLCLK = ((4MHz/7)*336)/4 = 48 MHz */
RCC_PLLConfig(RCC_PLLCFGR_PLLSRC_HSI, 7, 336, 4, 4); // 设置PLL时钟源及倍频系数
HSE_Or_HSI = 0;
//MsTimeTick = 48000;
}
/* Enable PLL */
RCC_PLLCmd(ENABLE); // 使能PLL
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) // 检查指定的RCC标志位设置与否
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); // 设置系统时钟（SYSCLK）
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08) // 返回用作系统时钟的时钟源
{
}
/* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and AFIO clocks */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1 , ENABLE );
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC
| RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOE,ENABLE);
/* Configure HCLK clock as SysTick clock source. */
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK );
#endif
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
}
