cmsis和stm32中std库的关系

Referneces:

以下基于cmsis和stm32 std库进行一个对比

对比前准备工作

下载cmsis

arm官方提供的cmsis可以在github找到。链接如下：
https://github.com/ARM-software/CMSIS_6
（以上仅用于对比）

repo目录如下：
image

为构建stm32工程，配置好cmsis以及stm32 std库

随便在keil官网里找一款stm32的package，然后导入keil中。链接如下：
https://www.keil.arm.com/packs/stm32f1xx_dfp-keil/versions/
然后还有cmsis的package，下载好之后导入keil中。链接如下：
https://www.keil.arm.com/packs/cmsis-arm/versions/
（用于对stm32 std工程的创建，因为stm32的std库是基于cmsis的描述进行构建的）

完成之后可以用两种方式查看是否导入成功：
1)查看keil目录
cmsis：
image
stm32 package
image

2)在keil中的Pack Installer查看
image

基于构建stm32 std库构建工程

image

对比

先看stm32工程，然后对比cmsis。

1)stm32 std库工程对于core_cm3.h的头文件包含关系如下，即core_cm3.h包含于stm32f10x.h包含于stm32f10x_gpio.h
image

2)之后观察CMSIS/Core/Template/Device_M目录下system_Device.c和system_Device.h
image
然后对比stm32工程下的system_stm32f10x.c和system_stm32f10x.h文件

```c
// file name: system_stm32f10x.c
/**
* @brief Setup the microcontroller system
* Initialize the Embedded Flash Interface, the PLL and update the
* SystemCoreClock variable.
* @note This function should be used only after reset.
* @param None
* @retval None
/
void SystemInit (void)
{
/ Reset the RCC clock configuration to the default reset state(for debug purpose) /
/ Set HSION bit */
RCC->CR |= (uint32_t)0x00000001;

/* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits /
#ifndef STM32F10X_CL
RCC->CFGR &= (uint32_t)0xF8FF0000;
#else
RCC->CFGR &= (uint32_t)0xF0FF0000;
#endif / STM32F10X_CL */

/* Reset HSEON, CSSON and PLLON bits */
RCC->CR &= (uint32_t)0xFEF6FFFF;

/* Reset HSEBYP bit */
RCC->CR &= (uint32_t)0xFFFBFFFF;

/* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
RCC->CFGR &= (uint32_t)0xFF80FFFF;

ifdef STM32F10X_CL

/* Reset PLL2ON and PLL3ON bits */
RCC->CR &= (uint32_t)0xEBFFFFFF;

/* Disable all interrupts and clear pending bits */
RCC->CIR = 0x00FF0000;

/* Reset CFGR2 register /
RCC->CFGR2 = 0x00000000;
#elif defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
/ Disable all interrupts and clear pending bits */
RCC->CIR = 0x009F0000;

/* Reset CFGR2 register /
RCC->CFGR2 = 0x00000000;
#else
/ Disable all interrupts and clear pending bits /
RCC->CIR = 0x009F0000;
#endif / STM32F10X_CL */

if defined (STM32F10X_HD) || (defined STM32F10X_XL) || (defined STM32F10X_HD_VL)

ifdef DATA_IN_ExtSRAM

SystemInit_ExtMemCtl();
#endif /* DATA_IN_ExtSRAM */
#endif

/* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers /
/ Configure the Flash Latency cycles and enable prefetch buffer */
SetSysClock();

ifdef VECT_TAB_SRAM

SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. /
#else
SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; / Vector Table Relocation in Internal FLASH. */
#endif
}
```

```c
// file name: system_Device.c
/---------------------------------------------------------------------------
System initialization function
---------------------------------------------------------------------------/
void SystemInit (void)
{
/ ToDo: Add code to initialize the system.
Do not use global variables because this function is called before
reaching pre-main. RW section maybe overwritten afterwards. */

/* ToDo: Initialize VTOR if available */
#if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
SCB->VTOR = (uint32_t)(&__VECTOR_TABLE[0]);
#endif

/* ToDo: Enable co-processor if it is used /
#if (defined (__FPU_USED) && (__FPU_USED == 1U)) ||
(defined (__ARM_FEATURE_MVE) && (__ARM_FEATURE_MVE > 0U))
SCB->CPACR |= ((3U << 10U2U) | /* enable CP10 Full Access /
(3U << 11U2U) ); /* enable CP11 Full Access */
#endif

/* ToDo: Initialize SAU if TZ is used */
#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
TZ_SAU_Setup();
#endif

SystemCoreClock = SYSTEM_CLOCK;
}
```

可以发现stm32工程下的SystemInit是根据cmsis下的ToDo注释实现的。

在stm32工程中，除了还有一个名为stm32f10x.h的头文件，与system_stm32f10x.c和system_stm32f10x.h基于cmsis的实现紧密相关。其中stm32f10x.h中实现了内存映射的功能，如下：

```c
...
/** @addtogroup Peripheral_memory_map
* @{
*/

define FLASH_BASE ((uint32_t)0x08000000) /*!< FLASH base address in the alias region */

define SRAM_BASE ((uint32_t)0x20000000) /*!< SRAM base address in the alias region */

define PERIPH_BASE ((uint32_t)0x40000000) /*!< Peripheral base address in the alias region */

define SRAM_BB_BASE ((uint32_t)0x22000000) /*!< SRAM base address in the bit-band region */

define PERIPH_BB_BASE ((uint32_t)0x42000000) /*!< Peripheral base address in the bit-band region */

define FSMC_R_BASE ((uint32_t)0xA0000000) /*!< FSMC registers base address */

/*!< Peripheral memory map */
#define APB1PERIPH_BASE PERIPH_BASE
#define APB2PERIPH_BASE (PERIPH_BASE + 0x10000)
#define AHBPERIPH_BASE (PERIPH_BASE + 0x20000)

define TIM2_BASE (APB1PERIPH_BASE + 0x0000)

define TIM3_BASE (APB1PERIPH_BASE + 0x0400)

define TIM4_BASE (APB1PERIPH_BASE + 0x0800)

define TIM5_BASE (APB1PERIPH_BASE + 0x0C00)

...
```

3)以下则为stm32 std固件库基于cmsis的外设部分的实现，这里只列举gpio。其他timer/uart/i2c/spi等以此类推

stm32 std固件库包含关系：
image

cmsis包含关系：
image

（PS：对于其他使用arm内核的方案，如rlt，其外设驱动固件库的结构都大同小异，都是以cmsis为蓝本进行功能实现的r）

posted @ 2024-09-26 10:23  stitchCat  阅读(253)  评论(0)    收藏  举报