STM32存储左右互搏 SPI总线读写FRAM MB85RS2M
在中低容量存储领域，除了FLASH的使用，，还有铁电存储器FRAM的使用，相对于FLASH，FRAM写操作时不需要预擦除，所以执行写操作时可以达到更高的速度，其主要优点为没有FLASH持续写操作跨页地址需要变换的要求。相比于SRAM则具有非易失性, 因此价格方面会高一些。MB85RS2M是512K Byte（2M 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FLASH：
这里介绍STM32访问FRAM MB85RS2M的例程。采用STM32CUBEIDE开发平台，以STM32F401CCU6芯片为例，通过STM32 SPI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SPI接口:
增加配置PA4作为SPI软件代码控制输出的片选管脚
并增加PA2和PA3连接到/WP和/HOLD管脚，并保持输出高电平:
配置USB作为通讯口：
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）
代码里用到的微秒延时函数参考： STM32 HAL us delay（微秒延时）的指令延时实现方式及优化
这里的测试逻辑实现为：当USB虚拟串口收到任何数据时，STM32在内部对MB85RS2M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 */
}
新建MB85RS2M访问函数头文件MB85RS2M.h
#ifndef INC_MB85RS2M_H_
#define INC_MB85RS2M_H_
#include "main.h"/*To define operation code*/
#define WREN 0x06 //Set Write Enable Latch
#define WRDI 0x04 //Reset Write Enable Latch
#define RDSR 0x05 //Read Status Register
#define WRSR 0x01 //Write Status Register
#define READ 0x03 //Read Memory Code
#define WRITE 0x02 //Write Memory Code
#define RDID 0x9F //Read Device ID#define MB85RS2M_ID 0x03487F04uint32_t MB85RS2M_ReadID(void);
uint8_t MB85RS2M_Init(void);
void MB85RS2M_Set_Write_Enable_Latch(void);
void MB85RS2M_Reset_Write_Enable_Latch(void);
void MB85RS2M_Write_Status_Register(uint8_t SRV);
uint8_t MB85RS2M_Read_Status_Register(void);
void MB85RS2M_Write_Memory(uint8_t * wd, uint32_t addr, uint32_t len);
void MB85RS2M_Read_Memory(uint8_t * rd, uint32_t addr, uint32_t len);#endif /* INC_MB85RS2M_H_ */新建MB85RS16访问函数源文件MB85RS2M.c
//Written by Pegasus Yu in 2023#include "MB85RS2M.h"
#include <string.h>#define SPI1_CS_L HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET)
#define SPI1_CS_H HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET)
extern SPI_HandleTypeDef hspi1;
extern void PY_Delay_us_t(uint32_t Delay);uint32_t MB85RS2M_ReadID(void)
{uint8_t ftd[5];uint8_t frd[5];uint8_t Manufacturer_ID;uint8_t Continuation_Code;uint8_t Product_ID_L;uint8_t Product_ID_H;ftd[0]=RDID;SPI1_CS_L;HAL_SPI_TransmitReceive(&hspi1, ftd, frd, 5, 0xFFFFFFFF);SPI1_CS_H;Manufacturer_ID = frd[1];Continuation_Code = frd[2];Product_ID_L = frd[3];Product_ID_H = frd[4];return ((Product_ID_H<<24)|(Product_ID_L<<16)|(Continuation_Code<<8)|(Manufacturer_ID));
}uint8_t MB85RS2M_Init(void)
{uint8_t st = 0;for(uint8_t i=0; i<4; i++){if(MB85RS2M_ReadID()==MB85RS2M_ID){st = 1;break;}}return st;}/** WEL is reset after the following operations which means every write operation must follow once WREN operation MB85RS2M_Set_Write_Enable_Latch().* After power ON.* After WRDI command recognition.* At the rising edge of CS after WRSR command recognition.* At the rising edge of CS after WRITE command recognition.*/
void MB85RS2M_Set_Write_Enable_Latch(void)
{uint8_t cmd = WREN;SPI1_CS_L;HAL_SPI_Transmit(&hspi1, &cmd, 1, 0xFFFFFFFF);SPI1_CS_H;
}void MB85RS2M_Reset_Write_Enable_Latch(void)
{uint8_t cmd = WRDI;SPI1_CS_L;HAL_SPI_Transmit(&hspi1, &cmd, 1, 0xFFFFFFFF);SPI1_CS_H;
}void MB85RS2M_Write_Status_Register(uint8_t SRV)
{uint8_t data[2];data[0] = WRSR;data[1] = SRV;MB85RS2M_Set_Write_Enable_Latch();PY_Delay_us_t(2);SPI1_CS_L;HAL_SPI_Transmit(&hspi1, data, 2, 0xFFFFFFFF);SPI1_CS_H;
}uint8_t MB85RS2M_Read_Status_Register(void)
{uint8_t cmd[2];uint8_t data[2];uint8_t SRV;cmd[0] = RDSR;SPI1_CS_L;HAL_SPI_TransmitReceive(&hspi1, cmd, data, 2, 0xFFFFFFFF);SPI1_CS_H;SRV = data[1];return SRV;}/** wd: data buffer pointer* addr: address to operate for MB85RS2M* len: data length to be written*/void MB85RS2M_Write_Memory(uint8_t * wd, uint32_t addr, uint32_t len)
{uint8_t data[len+4];data[0] = WRITE;data[1] = (uint8_t)(addr>>16);data[2] = (uint8_t)(addr>>8);data[3] = (uint8_t)addr;memcpy(data+4, wd, len);MB85RS2M_Set_Write_Enable_Latch();PY_Delay_us_t(2);SPI1_CS_L;HAL_SPI_Transmit(&hspi1, data, len+4, 0xFFFFFFFF);SPI1_CS_H;
}/** rd: data buffer pointer* addr: address to operate for MB85RS2M* len: data length to be written*/void MB85RS2M_Read_Memory(uint8_t * rd, uint32_t addr, uint32_t len)
{uint8_t cmd[len+4];uint8_t data[len+4];cmd[0] = READ;cmd[1] = (uint8_t)(addr>>16);cmd[2] = (uint8_t)(addr>>8);cmd[3] = (uint8_t)addr;SPI1_CS_L;HAL_SPI_TransmitReceive(&hspi1, cmd, data , len+4, 0xFFFFFFFF);SPI1_CS_H;memcpy(rd, data+4, len);
}完整的main.c主文件代码如下：
/* 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>
#include "MB85RS2M.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 */
__IO float usDelayBase;
void PY_usDelayTest(void)
{__IO uint32_t firstms, secondms;__IO uint32_t counter = 0;firstms = HAL_GetTick()+1;secondms = firstms+1;while(uwTick!=firstms) ;while(uwTick!=secondms) counter++;usDelayBase = ((float)counter)/1000;
}void PY_Delay_us_t(uint32_t Delay)
{__IO uint32_t delayReg;__IO uint32_t usNum = (uint32_t)(Delay*usDelayBase);delayReg = 0;while(delayReg!=usNum) delayReg++;
}void PY_usDelayOptimize(void)
{__IO uint32_t firstms, secondms;__IO float coe = 1.0;firstms = HAL_GetTick();PY_Delay_us_t(1000000) ;secondms = HAL_GetTick();coe = ((float)1000)/(secondms-firstms);usDelayBase = coe*usDelayBase;
}void PY_Delay_us(uint32_t Delay)
{__IO uint32_t delayReg;__IO uint32_t msNum = Delay/1000;__IO uint32_t usNum = (uint32_t)((Delay%1000)*usDelayBase);if(msNum>0) HAL_Delay(msNum);delayReg = 0;while(delayReg!=usNum) delayReg++;
}
/* USER CODE END PD *//* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM *//* USER CODE END PM *//* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi1;/* USER CODE BEGIN PV *//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_SPI1_Init(void);
/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint8_t cmd=0; //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 lengthuint8_t MB85RS2M_Status = 0;
uint16_t MB85RS2M_OPADDR = 0;
/* 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_USB_DEVICE_Init();MX_SPI1_Init();/* USER CODE BEGIN 2 */PY_usDelayTest();PY_usDelayOptimize();MB85RS2M_Status = MB85RS2M_Init();/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){if(cmd==1){cmd = 0;if(MB85RS2M_Status==1){MB85RS2M_OPADDR = 0; //Set operation address hereMB85RS2M_Write_Memory(RData, MB85RS2M_OPADDR, RDataLen);PY_Delay_us_t(2);uint8_t rd[RDataLen];MB85RS2M_Read_Memory(rd, MB85RS2M_OPADDR, RDataLen);TData = rd;TDataLen = RDataLen;CDC_Transmit_FS(TData, TDataLen);}else{CDC_Transmit_FS("MB85RS2M ID read failure!\r\n", strlen("MB85RS2M ID read failure!\r\n"));}}/* 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 SPI1 Initialization Function* @param None* @retval None*/
static void MX_SPI1_Init(void)
{/* USER CODE BEGIN SPI1_Init 0 *//* USER CODE END SPI1_Init 0 *//* USER CODE BEGIN SPI1_Init 1 *//* USER CODE END SPI1_Init 1 *//* SPI1 parameter configuration*/hspi1.Instance = SPI1;hspi1.Init.Mode = SPI_MODE_MASTER;hspi1.Init.Direction = SPI_DIRECTION_2LINES;hspi1.Init.DataSize = SPI_DATASIZE_8BIT;hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;hspi1.Init.NSS = SPI_NSS_SOFT;hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;hspi1.Init.TIMode = SPI_TIMODE_DISABLE;hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;hspi1.Init.CRCPolynomial = 10;if (HAL_SPI_Init(&hspi1) != HAL_OK){Error_Handler();}/* USER CODE BEGIN SPI1_Init 2 *//* USER CODE END SPI1_Init 2 */}/*** @brief GPIO Initialization Function* @param None* @retval None*/
static void MX_GPIO_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct = {0};
/* 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();/*Configure GPIO pin Output Level */HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4, GPIO_PIN_SET);/*Configure GPIO pins : PA2 PA3 PA4 */GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4;GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);/* 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 MB85RS2M例程
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