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。
" Y: u$ m0 D) B2 @* Z, _$ G) s        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

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。

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1. 
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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"
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6. #include "stm32u5xx_ll_bus.h"
   
7. #include "stm32u5xx_ll_system.h"
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8. #include "stm32u5xx_ll_exti.h"
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9. #include "stm32u5xx_ll_cortex.h"
   
10. #include "stm32u5xx_ll_utils.h"
    
11. #include "stm32u5xx_ll_dma.h"
    
12. #include "stm32u5xx_ll_gpio.h"
    
13. #include "stm32u5xx_ll_lpgpio.h"
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14. 
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15. 
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16. 
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17. 
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18. #define LED1_Pin LL_GPIO_PIN_7
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19. #define LED1_GPIO_Port GPIOC
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20. 
    
21. 
    
22. 
    
23. /**
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24.   * @brief Power Configuration
    
25.   * @retval None
    
26.   */
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27. static void SystemPower_Config(void)
    
28. {
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29. 
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30.   /*
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31.    * Disable the internal Pull-Up in Dead Battery pins of UCPD peripheral
    
32.    */
    
33.   LL_PWR_DisableUCPDDeadBattery();
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34. 
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35.   /*
    
36.    * Switch to SMPS regulator instead of LDO
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37.    */
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38.   LL_PWR_SetRegulatorSupply(LL_PWR_SMPS_SUPPLY);
    
39. 
    
40.   while(LL_PWR_IsActiveFlag_REGULATOR()!=1)
    
41.   {
    
42.   }
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43. }
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44. 
    
45. /**
    
46.   * @brief ICACHE Initialization Function
    
47.   * @param None
    
48.   * @retval None
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49.   */
    
50. static void MX_ICACHE_Init(void)
    
51. {
    
52. 
    
53.   /** Enable instruction cache in 1-way (direct mapped cache)
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54.   */
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55.   LL_ICACHE_SetMode(LL_ICACHE_1WAY);
    
56.   LL_ICACHE_Enable();
    
57.   /* USER CODE BEGIN ICACHE_Init 2 */
    
58. 
    
59.   /* USER CODE END ICACHE_Init 2 */
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60. 
    
61. }
    
62. 
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63. 
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64. void SystemClock_Config(void)
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65. {
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66.   LL_FLASH_SetLatency(LL_FLASH_LATENCY_4);
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67.   while(LL_FLASH_GetLatency()!= LL_FLASH_LATENCY_4)
    
68.   {
    
69.   }
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70. 
    
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 */
    
75.   while(LL_RCC_MSIS_IsReady() != 1)
    
76.   {
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77.   }
    
78. 
    
79.   LL_RCC_MSI_EnableRangeSelection();
    
80.   LL_RCC_MSIS_SetRange(LL_RCC_MSISRANGE_4);
    
81.   LL_RCC_MSI_SetCalibTrimming(16, LL_RCC_MSI_OSCILLATOR_1);
    
82.   LL_RCC_PLL1_ConfigDomain_SYS(LL_RCC_PLL1SOURCE_MSIS, 1, 80, 2);
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83.   LL_RCC_PLL1_EnableDomain_SYS();
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84.   LL_RCC_SetPll1EPodPrescaler(LL_RCC_PLL1MBOOST_DIV_1);
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85.   LL_RCC_PLL1_SetVCOInputRange(LL_RCC_PLLINPUTRANGE_4_8);
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86.   LL_RCC_PLL1_Enable();
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87. 
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88.    /* Wait till PLL is ready */
    
89.   while(LL_RCC_PLL1_IsReady() != 1)
    
90.   {
    
91.   }
    
92. 
    
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);
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95. 
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96.   LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL1);
    
97. 
    
98.    /* Wait till System clock is ready */
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99.   while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL1)
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100.   {
     
101.   }
     
102. 
     
103.   /* Insure 1µs transition state at intermediate medium speed clock based on DWT*/
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104.   CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
     
105. 
     
106.   DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
     
107.   DWT->CYCCNT = 0;
     
108.   while(DWT->CYCCNT < 100);
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109. 
     
110.   LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
     
111.   LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
     
112.   LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
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113.   LL_RCC_SetAPB3Prescaler(LL_RCC_APB3_DIV_1);
     
114. 
     
115.   LL_Init1msTick(160000000);
     
116. 
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117.   LL_SetSystemCoreClock(160000000);
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118. }
     
119. 
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120. /**
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121.   * @brief GPIO Initialization Function
     
122.   * @param None
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123.   * @retval None
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124.   */
     
125. static void MX_GPIO_Init(void)
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126. {
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127.   LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
     
128. 
     
129.   /* GPIO Ports Clock Enable */
     
130.   LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);
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131. 
     
132.   /**/
     
133.   LL_GPIO_ResetOutputPin(LED1_GPIO_Port, LED1_Pin);
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134. 
     
135.   /**/
     
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;
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139.   GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
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140.   GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
     
141.   LL_GPIO_Init(LED1_GPIO_Port, &GPIO_InitStruct);
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142. 
     
143. }
     
144. 
     
145. 
     
146. 
     
147. int main(void)
     
148. {
     
149.   LL_AHB3_GRP1_EnableClock(LL_AHB3_GRP1_PERIPH_PWR);
     
150.   SystemClock_Config();
     
151.   SystemPower_Config();
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152.   MX_GPIO_Init();
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153.   MX_ICACHE_Init();
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154.   while (1)
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155.   {
     
156.                 LL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin);
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157.                 LL_mDelay(500);
     
158.   }
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159.   /* USER CODE END 3 */
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160. }
     
161. 
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162. 
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163. 
     
164. #ifdef  USE_FULL_ASSERT
     
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
     
169.   * @param  line: assert_param error line source number
     
170.   * @retval None
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171.   */
     
172. void assert_failed(uint8_t *file, uint32_t line)
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173. {
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174.   /* USER CODE BEGIN 6 */
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175. 
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176.   /* User can add his own implementation to report the file name and line number,
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177.      ex: printf("Wrong parameters value: file %s on line %d", file, line) */
     
178. 
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179.   /* Infinite loop */
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180.   while (1)
     
181.   {
     
182.   }
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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。

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好了，先分享到这，过年后来了的第一篇。

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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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