企业网站模板带后台,做招聘网站怎么办营业执照,有人看片吗免费观看,贵阳网站建开发STM32存储左右互搏 I2C总线读写FRAM MB85RC16
在较低容量存储领域#xff0c;除了EEPROM的使用#xff0c;还有铁电存储器FRAM的使用#xff0c;相对于EEPROM, 同样是非易失性存储单元#xff0c;FRAM支持更高的访问速度#xff0c; 其主要优点为没有EEPROM持续写操作跨页…STM32存储左右互搏 I2C总线读写FRAM MB85RC16
在较低容量存储领域除了EEPROM的使用还有铁电存储器FRAM的使用相对于EEPROM, 同样是非易失性存储单元FRAM支持更高的访问速度 其主要优点为没有EEPROM持续写操作跨页地址需要变换的要求没有写之后的延时等待要求。MB85RC16是2K Byte16K bit的FRAM能够按字节进行写入且没有写入等待时间。其管脚功能兼容相应容量的EEPOM I2C总线访问的FRAM更大容量的型号还有MB85RC128及MB85RC256等。 这里介绍STM32访问FRAM MB85RC16的例程。采用STM32CUBEIDE开发平台以STM32F401CCU6芯片为例通过STM32 I2C硬件电路实现读写操作通过USB虚拟串口进行控制。
STM32工程配置
首先建立基本工程并设置时钟 配置硬件I2C接口STM32F401CCU6的I2C快速模式只支持400KHz速率
中断不用开
然后配置USB虚拟串口 保存并生成初始工程代码
STM32工程代码
USB虚拟串口的使用参考STM32 USB VCOM和HID的区别配置及Echo功能实现HAL
这里的测试逻辑比较简单当USB虚拟串口收到任何数据时STM32在内部对MB85RC16写入从USB虚拟串口收到的数据然后再回读出来通过USB虚拟串口发送出去。
USB接收数据的代码
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
{/* USER CODE BEGIN 6 */extern uint8_t cmd;extern uint8_t * RData;extern uint32_t RDataLen;RData Buf;RDataLen *Len;cmd 1;USBD_CDC_SetRxBuffer(hUsbDeviceFS, Buf[0]);USBD_CDC_ReceivePacket(hUsbDeviceFS);return (USBD_OK);/* USER CODE END 6 */
}MB85RC16的设备默认访问地址为0xA0 MB85RC16的存储单元地址访问略为特殊11位地址分为两部分高位的3位放置于I2C设备默认访问地址的第3~第1位I2C设备默认访问地址第0位仍然为读写控制位由于采用硬件I2C控制库函数自行通过识别调用的是发送还是接收函数对第0位进行发送前设置因此不管是调用库函数的I2C写操作还是读操作提供的地址相同。11位地址的低8位通过在发送设备地址后的作为跟随的第一个字节发送。
完成的main.c文件代码如下
/* USER CODE BEGIN Header */
/********************************************************************************* file : main.c* brief : Main program body******************************************************************************* attention** Copyright (c) 2023 STMicroelectronics.* All rights reserved.** This software is licensed under terms that can be found in the LICENSE file* in the root directory of this software component.* If no LICENSE file comes with this software, it is provided AS-IS.********************************************************************************/
//Written by Pegasus Yu in 2023
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include main.h
#include usb_device.h/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include string.h
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len);
/* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD *//* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM *//* USER CODE END PM *//* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;/* USER CODE BEGIN PV *//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint8_t cmd0; //for status control
uint8_t * RData; //USB rx data pointer
uint32_t RDataLen; //USB rx data length
uint8_t * TData; //USB tx data pointer
uint32_t TDataLen; //USB tx data lengthuint16_t MB85RC16_Access_Addr 0; //FRAM MB85RC16 access address (11-bit)#define MB85RC16_Default_I2C_Addr 0xA0void MB85RC16_Write(uint32_t addr, uint8_t * data, uint32_t len)
{uint8_t MB85RC16_I2C_Addr;MB85RC16_I2C_Addr MB85RC16_Default_I2C_Addr | ((addr8)1); //high 3-bit access address placed into I2C addressuint8_t TD[len1];TD[0] addr 0x00FF; //low 8-bit access address placed into I2C first datamemcpy(TD1, data, len);HAL_I2C_Master_Transmit(hi2c1, MB85RC16_I2C_Addr, TD, len1, 2700); //Write data
}void MB85RC1M_Read(uint32_t addr, uint8_t * data, uint32_t len)
{uint8_t MB85RC16_I2C_Addr;MB85RC16_I2C_Addr MB85RC16_Default_I2C_Addr | ((addr8)1); //high 3-bit access address placed into I2C addressuint8_t RA[1];RA[0] addr 0x00FF; //low 8-bit access address placed into I2C first dataHAL_I2C_Master_Transmit(hi2c1, MB85RC16_I2C_Addr, RA[0], 1, 2700); //Write address for readHAL_I2C_Master_Receive(hi2c1, MB85RC16_I2C_Addr, data, len, 2700); //Read data}
/* USER CODE END 0 *//*** brief The application entry point.* retval int*/
int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_I2C1_Init();MX_USB_DEVICE_Init();/* USER CODE BEGIN 2 *//* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){if(cmd1){cmd0;MB85RC16_Access_Addr 0; //Set FRAM access address hereMB85RC16_Write(MB85RC16_Access_Addr, RData, RDataLen);TDataLen RDataLen;uint8_t TD[TDataLen];TData TD;MB85RC1M_Read(MB85RC16_Access_Addr, TData , TDataLen);CDC_Transmit_FS(TData, TDataLen);}/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}/*** brief System Clock Configuration* retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct {0};RCC_ClkInitTypeDef RCC_ClkInitStruct {0};/** Configure the main internal regulator output voltage*/__HAL_RCC_PWR_CLK_ENABLE();__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);/** Initializes the RCC Oscillators according to the specified parameters* in the RCC_OscInitTypeDef structure.*/RCC_OscInitStruct.OscillatorType RCC_OSCILLATORTYPE_HSE;RCC_OscInitStruct.HSEState RCC_HSE_ON;RCC_OscInitStruct.PLL.PLLState RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLM 25;RCC_OscInitStruct.PLL.PLLN 336;RCC_OscInitStruct.PLL.PLLP RCC_PLLP_DIV4;RCC_OscInitStruct.PLL.PLLQ 7;if (HAL_RCC_OscConfig(RCC_OscInitStruct) ! HAL_OK){Error_Handler();}/** Initializes the CPU, AHB and APB buses clocks*/RCC_ClkInitStruct.ClockType RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;RCC_ClkInitStruct.SYSCLKSource RCC_SYSCLKSOURCE_PLLCLK;RCC_ClkInitStruct.AHBCLKDivider RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider RCC_HCLK_DIV2;RCC_ClkInitStruct.APB2CLKDivider RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(RCC_ClkInitStruct, FLASH_LATENCY_2) ! HAL_OK){Error_Handler();}
}/*** brief I2C1 Initialization Function* param None* retval None*/
static void MX_I2C1_Init(void)
{/* USER CODE BEGIN I2C1_Init 0 *//* USER CODE END I2C1_Init 0 *//* USER CODE BEGIN I2C1_Init 1 *//* USER CODE END I2C1_Init 1 */hi2c1.Instance I2C1;hi2c1.Init.ClockSpeed 400000;hi2c1.Init.DutyCycle I2C_DUTYCYCLE_2;hi2c1.Init.OwnAddress1 0;hi2c1.Init.AddressingMode I2C_ADDRESSINGMODE_7BIT;hi2c1.Init.DualAddressMode I2C_DUALADDRESS_DISABLE;hi2c1.Init.OwnAddress2 0;hi2c1.Init.GeneralCallMode I2C_GENERALCALL_DISABLE;hi2c1.Init.NoStretchMode I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(hi2c1) ! HAL_OK){Error_Handler();}/* USER CODE BEGIN I2C1_Init 2 *//* USER CODE END I2C1_Init 2 */}/*** brief GPIO Initialization Function* param None* retval None*/
static void MX_GPIO_Init(void)
{
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 *//* GPIO Ports Clock Enable */__HAL_RCC_GPIOH_CLK_ENABLE();__HAL_RCC_GPIOA_CLK_ENABLE();__HAL_RCC_GPIOB_CLK_ENABLE();/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}/* USER CODE BEGIN 4 *//* USER CODE END 4 *//*** brief This function is executed in case of error occurrence.* retval None*/
void Error_Handler(void)
{/* USER CODE BEGIN Error_Handler_Debug *//* User can add his own implementation to report the HAL error return state */__disable_irq();while (1){}/* USER CODE END Error_Handler_Debug */
}#ifdef USE_FULL_ASSERT
/*** brief Reports the name of the source file and the source line number* where the assert_param error has occurred.* param file: pointer to the source file name* param line: assert_param error line source number* retval None*/
void assert_failed(uint8_t *file, uint32_t line)
{/* USER CODE BEGIN 6 *//* User can add his own implementation to report the file name and line number,ex: printf(Wrong parameters value: file %s on line %d\r\n, file, line) *//* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
STM32范例测试
上述范例的测试效果如下
STM32例程下载
STM32F401CCU6 I2C总线读写FRAM MB85RC16例程
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