Keil uVision5 如何新建專案(不使用官方的函式庫)
在介紹開始前，先把一些重要資料先蒐集到，方便我們後續的程式撰寫，按一下名稱就可以下載了。
開發環境：MDK 5.20
使用MCU：STM32F051R8T6
1.開發板燒錄器：
2.開發板電路訊息：
3.STM32F0時脈設定工具：
開始要來建立第一個專案，亮滅一個LED當作測試。
STEP1:
執行 Keil uVision5 軟體，選擇 Project->New uVision Project...
STEP2:
選擇儲存目錄和輸入檔案名稱之後，再存檔
STEP3:
選擇Device(STM32F051R8)之後，再選OK完成
STEP4:
選擇CMSIS->CORE 和 Device->Startup 兩項打勾，再選擇OK完成
STEP5:
滑鼠選擇Source Group 1 後，按滑鼠右鍵選擇 Add New Item to Group 'Source Group 1'...，
再選擇C File(.c)，並在Name欄位輸入 main，再選擇Add完成
STEP6:
開始寫main.c，代碼如下
#include "stm32f0xx.h" // File name depends on device used
#include "RTE_Components.h" // Component selection
volatile uint32_t msTicks; // Counter for millisecond Interval
/*--------------------------------------------------------------------------------*/
// SysTick Interrupt Handler
/*--------------------------------------------------------------------------------*/
void SysTick_Handler(void)
{
msTicks++; // Increment Counter
}
/*--------------------------------------------------------------------------------*/
// Delay: delay a number of Systicks
/*--------------------------------------------------------------------------------*/
void Delay(uint32_t dlyTicks)
{
uint32_t currentTicks;
currentTicks = msTicks;
while((msTicks - currentTicks) < dlyTicks) __NOP();
}
/*--------------------------------------------------------------------------------*/
// Configure SystemCoreClock using HSI
/*--------------------------------------------------------------------------------*/
void ConfigureSystemClock(void)
{
RCC->CR |= ((uint32_t)RCC_CR_HSION); // Enable 8MHz HSI RC
while ((RCC->CR & RCC_CR_HSIRDY) == 0) __NOP(); // Wait for HSI Ready
RCC->CFGR = RCC_CFGR_SW_HSI; // Set HSI as system clock
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI); // Wait for HSI used as system clock
FLASH->ACR = FLASH_ACR_PRFTBE; // Enable Prefetch Buffer
FLASH->ACR |= FLASH_ACR_LATENCY; // Flash 1 wait state
RCC->CFGR |= RCC_CFGR_HPRE_DIV1; // HCLK = SYSCLK
RCC->CFGR |= RCC_CFGR_PPRE_DIV1; // PCLK = HCLK
RCC->CR &= ~RCC_CR_PLLON; // Disable PLL to set PLL clk
// PLL configuration: = HSI/2 * 12 = 48 MHz
RCC->CFGR &= ~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMUL);
#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F070x6) \
|| defined(STM32F078xx) || defined(STM32F071xB) || defined(STM32F072xB) \
|| defined(STM32F070xB) || defined(STM32F091xC) || defined(STM32F098xx) || defined(STM32F030xC)
/* HSI used as PLL clock source : SystemCoreClock = HSI/PREDIV * PLLMUL */
RCC->CFGR2 = (RCC_CFGR2_PREDIV_DIV2);
RCC->CFGR |= (RCC_CFGR_PLLSRC_HSI_PREDIV | RCC_CFGR_PLLMUL12);
#else
/* HSI used as PLL clock source : SystemCoreClock = HSI/2 * PLLMUL */
RCC->CFGR |= (RCC_CFGR_PLLSRC_HSI_DIV2 | RCC_CFGR_PLLMUL12);
#endif
RCC->CR |= RCC_CR_PLLON; // Enable PLL
while((RCC->CR & RCC_CR_PLLRDY) == 0) __NOP(); // Wait till PLL is ready
RCC->CFGR &= ~RCC_CFGR_SW; // Select PLL as system clock source
RCC->CFGR |= RCC_CFGR_SW_PLL;
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL); // Wait till PLL is system clock src
}
/*--------------------------------------------------------------------------------*/
// GPIOC_Init
/*--------------------------------------------------------------------------------*/
void GPIOC_Init(void)
{
RCC->AHBENR |= (1ul << 19); // Enable GPIOC clock
/* Configure LED (PC.8) pins as push-pull outputs, No pull-up, pull-down */
GPIOC->MODER &= ~((3ul << 2*8)); // set GPIOC pin 8 as output pin
GPIOC->MODER |= ((1ul << 2*8)); // 01: General purpose output mode
GPIOC->OTYPER &= ~((1ul << 8)); // set pin 8 as O/P push-pull
GPIOC->OSPEEDR &= ~((3ul << 2*8)); // set pin 8 as medium speed O/P
GPIOC->OSPEEDR |= ((1ul << 2*8));
GPIOC->PUPDR &= ~((3ul << 2*8)); // set pin 8 as no pull-up & pull-down
}
/*--------------------------------------------------------------------------------*/
// LED_on(); Turn on LED
/*--------------------------------------------------------------------------------*/
void LED_on(void)
{
GPIOC->BSRR |= ((1ul << 8)); // set pin 8 = 1 to turn on LED
}
/*--------------------------------------------------------------------------------*/
// LED_off(); Turn off LED
/*--------------------------------------------------------------------------------*/
void LED_off(void)
{
GPIOC->BSRR |= (1ul << (8+16)); // set pin 8 = 0 to turn off LED
}
/*--------------------------------------------------------------------------------*/
// The processor clock is initialized by CMSIS startup + system file
/*--------------------------------------------------------------------------------*/
// User application starts here
int main(void)
{
ConfigureSystemClock(); // Configure system clock
SystemCoreClockUpdate(); // Set system clock value to variable SystemCoreClock
GPIOC_Init(); // Initialize GPIOC pin 8 to control LED
//System Tick Configuration: Initializes the System Timer and its interrupt,
// and starts the System Tick Timer.
// Counter is in free running mode to generate periodic interrupts.
// param [in] ticks Number of ticks between two interrupts.
SysTick_Config(SystemCoreClock/1000); // set up SysTick 1ms interrupt
while(1)
{
LED_on();
Delay(1000);
LED_off();
Delay(1000);
}
}
STEP7:
設定一些參數，以利於編譯源代碼
先選擇左邊的Project->Target1->Options for Target 'Target 1'... ，會開一個視窗，如圖片並依照相關選項選取後，再點選OK完成。
STEP8:
選擇選單Project->Build Target ，或是下圖點選Icon並編譯。
STEP9:
選擇選單Flash->Download，或是下圖點選Icon，並燒錄到開發板上(必須將開發闆接到電腦並安裝完驅動)。
STEP10:
這樣就完成，LED(PC8)就會一秒亮，一秒滅的循環，如圖片為實物和PC8所量測出的波形。
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