说实话，我不喜欢hall库，也许很多人用起来很顺手，但是我用起来不习惯，而且LL库效率明显高得多，也许是没有接触过上层代码的原因吧，那么我就来说一下LL库的环境搭建以及点灯。
$ u& T! i9 L% ^1 s) A7 P3 m* y        我们首先根据官方的LL库以及例程做更改，新建文件夹，拷贝文件，具体如下图。
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        并将文件拷贝到个个文件夹内，方便将文件归类以及后期文件管理，具体的可以看附件里，附件内的源码。具体的可以查看keil工程下的文件，如下图

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文件拷贝完成之后，然后添加文件路径和初始化定义，然后增加如下代码到Main.c文件。

1. 
   
2. #include "stm32u5xx_ll_icache.h"
   
3. #include "stm32u5xx_ll_pwr.h"
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4. #include "stm32u5xx_ll_crs.h"
   
5. #include "stm32u5xx_ll_rcc.h"
   
6. #include "stm32u5xx_ll_bus.h"
   
7. #include "stm32u5xx_ll_system.h"
   
8. #include "stm32u5xx_ll_exti.h"
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9. #include "stm32u5xx_ll_cortex.h"
   
10. #include "stm32u5xx_ll_utils.h"
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11. #include "stm32u5xx_ll_dma.h"
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12. #include "stm32u5xx_ll_gpio.h"
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13. #include "stm32u5xx_ll_lpgpio.h"
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14. 
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15. 
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16. 
    # R; \" N: V: ]1 k8 m& X+ N
17. 
    
18. #define LED1_Pin LL_GPIO_PIN_7
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19. #define LED1_GPIO_Port GPIOC
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20. 
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21. 
    
22. 
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23. /**
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24.   * @brief Power Configuration
    
25.   * @retval None
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26.   */
    
27. static void SystemPower_Config(void)
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28. {
    
29. 
    
30.   /*
    
31.    * Disable the internal Pull-Up in Dead Battery pins of UCPD peripheral
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32.    */
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33.   LL_PWR_DisableUCPDDeadBattery();
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34. 
    
35.   /*
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36.    * Switch to SMPS regulator instead of LDO
    
37.    */
    
38.   LL_PWR_SetRegulatorSupply(LL_PWR_SMPS_SUPPLY);
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39. 
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40.   while(LL_PWR_IsActiveFlag_REGULATOR()!=1)
    
41.   {
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42.   }
    
43. }
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44. 
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45. /**
    
46.   * @brief ICACHE Initialization Function
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47.   * @param None
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48.   * @retval None
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49.   */
    
50. static void MX_ICACHE_Init(void)
    
51. {
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52. 
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53.   /** Enable instruction cache in 1-way (direct mapped cache)
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54.   */
    
55.   LL_ICACHE_SetMode(LL_ICACHE_1WAY);
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56.   LL_ICACHE_Enable();
    
57.   /* USER CODE BEGIN ICACHE_Init 2 */
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58. 
      c% m! m  B# Q4 v7 m/ _  \  w* i
59.   /* USER CODE END ICACHE_Init 2 */
    
60. 
    
61. }
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62. 
    
63. 
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64. void SystemClock_Config(void)
    # D( ~* j" n: K3 b
65. {
    
66.   LL_FLASH_SetLatency(LL_FLASH_LATENCY_4);
    
67.   while(LL_FLASH_GetLatency()!= LL_FLASH_LATENCY_4)
    
68.   {
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69.   }
    
70. 
    % R; \* j6 ~" `/ @, u
71.   LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
    
72.   LL_RCC_MSIS_Enable();
    
73. 
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74.    /* Wait till MSIS is ready */
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75.   while(LL_RCC_MSIS_IsReady() != 1)
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76.   {
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77.   }
    
78. 
    
79.   LL_RCC_MSI_EnableRangeSelection();
    
80.   LL_RCC_MSIS_SetRange(LL_RCC_MSISRANGE_4);
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81.   LL_RCC_MSI_SetCalibTrimming(16, LL_RCC_MSI_OSCILLATOR_1);
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82.   LL_RCC_PLL1_ConfigDomain_SYS(LL_RCC_PLL1SOURCE_MSIS, 1, 80, 2);
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83.   LL_RCC_PLL1_EnableDomain_SYS();
    
84.   LL_RCC_SetPll1EPodPrescaler(LL_RCC_PLL1MBOOST_DIV_1);
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85.   LL_RCC_PLL1_SetVCOInputRange(LL_RCC_PLLINPUTRANGE_4_8);
    
86.   LL_RCC_PLL1_Enable();
    
87. 
    
88.    /* Wait till PLL is ready */
    
89.   while(LL_RCC_PLL1_IsReady() != 1)
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90.   {
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91.   }
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92. 
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93.    /* Intermediate AHB prescaler 2 when target frequency clock is higher than 80 MHz */
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94.   LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_2);
    
95. 
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96.   LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL1);
    
97. 
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98.    /* Wait till System clock is ready */
    
99.   while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL1)
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100.   {
     
101.   }
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102. 
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103.   /* Insure 1µs transition state at intermediate medium speed clock based on DWT*/
     
104.   CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
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105. 
     
106.   DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
     
107.   DWT->CYCCNT = 0;
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108.   while(DWT->CYCCNT < 100);
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109. 
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110.   LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
     
111.   LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
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112.   LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
     
113.   LL_RCC_SetAPB3Prescaler(LL_RCC_APB3_DIV_1);
     
114. 
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115.   LL_Init1msTick(160000000);
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116. 
     % {& [- ~3 I* S% O$ k
117.   LL_SetSystemCoreClock(160000000);
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118. }
     
119. 
     
120. /**
     
121.   * @brief GPIO Initialization Function
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122.   * @param None
     
123.   * @retval None
     
124.   */
     
125. static void MX_GPIO_Init(void)
     
126. {
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127.   LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
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128. 
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129.   /* GPIO Ports Clock Enable */
     
130.   LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);
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131. 
     
132.   /**/
     % k. S$ f" l7 L+ U
133.   LL_GPIO_ResetOutputPin(LED1_GPIO_Port, LED1_Pin);
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134. 
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135.   /**/
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136.   GPIO_InitStruct.Pin = LED1_Pin;
     
137.   GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
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138.   GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
     
139.   GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
     
140.   GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
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141.   LL_GPIO_Init(LED1_GPIO_Port, &GPIO_InitStruct);
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142. 
     % L; F: V2 K7 G5 x- f# p; A4 p  a, {
143. }
     * X! [) n: v3 `  K
144. 
     " s2 S8 A1 a: q9 U3 r
145. 
     
146. 
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147. int main(void)
     
148. {
     
149.   LL_AHB3_GRP1_EnableClock(LL_AHB3_GRP1_PERIPH_PWR);
     
150.   SystemClock_Config();
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151.   SystemPower_Config();
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152.   MX_GPIO_Init();
     
153.   MX_ICACHE_Init();
     
154.   while (1)
     
155.   {
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156.                 LL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin);
     
157.                 LL_mDelay(500);
     
158.   }
     
159.   /* USER CODE END 3 */
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160. }
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161. 
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162. 
     
163. 
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164. #ifdef  USE_FULL_ASSERT
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165. /**
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166.   * @brief  Reports the name of the source file and the source line number
     
167.   *         where the assert_param error has occurred.
     
168.   * @param  file: pointer to the source file name
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169.   * @param  line: assert_param error line source number
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170.   * @retval None
     
171.   */
     
172. void assert_failed(uint8_t *file, uint32_t line)
     
173. {
     
174.   /* USER CODE BEGIN 6 */
     
175. 
     
176.   /* User can add his own implementation to report the file name and line number,
     
177.      ex: printf("Wrong parameters value: file %s on line %d", file, line) */
     
178. 
     
179.   /* Infinite loop */
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180.   while (1)
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181.   {
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182.   }
     
183.   /* USER CODE END 6 */
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184. }
     
185. #endif /* USE_FULL_ASSERT */
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复制代码

在完成之后，编译，就可成功下载点灯，具体可查看附件。

好了，先分享到这，过年后来了的第一篇。

附件：工程源码 Demo.rar (716.81 KB, 下载次数: 1)

2023-2-2 23:27 上传

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