STM32存储左右互搏 I2C总线读写EEPROM ZD24C1MA
在较低容量存储领域，EEPROM是常用的存储介质，不同容量的EEPROM的地址对应位数不同，在发送字节的格式上有所区别。EEPROM是非快速访问存储，因为EEPROM按页进行组织，在连续操作模式，当跨页时访问地址不是跳到下一页到开始，而是跳到当前页的首地址，因此跨页时要重新指定起始地址。而在控制端发送写操作I2C数据后还需要有等待EEPROM内部操作完成的时间才能进行下一次操作。ZD24C1MA是1M bit / 128K Byte容量的EEPROM,ZD24C1MA的管脚定义为：
这里介绍STM32访问1Mbit EEPROM ZD24C1MA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UART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：
配置UART1作为通讯串口：
保存并生成初始工程代码：
STM32工程代码
这里的测试逻辑比较简单：
当串口收到指令0x01时向EEPROM 地址0写入预设的256个字节0x00~0xFF（不跨页），然后读出并通过串口打印出
当串口收到指令0x02时向EEPROM 地址600写入预设的256个字节0xFF~0x00（跨页），然后读出并通过串口打印出
ZD24C1MA的设备默认访问地址为0xA0， ZD24C1MA的存储单元地址访问略为特殊，17位地址分为两部分，最高位的1位放置于I2C设备默认访问地址的第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。17位地址的低16位通过在发送设备地址后的作为跟随的第一，二个字节发送。
建立ZD24C1MA.h库头文件
#ifndef INC_ZD24C1MA_H_
#define INC_ZD24C1MA_H_
#include "main.h"
void PY_Delay_us_t(uint32_t Delay);
void ZD24C1MA_Read(uint32_t addr, uint8_t * data, uint32_t len);
void ZD24C1MA_Write(uint32_t addr, uint8_t * data, uint32_t len);
#endif
建立ZD24C1MA.c库源文件：
#include <string.h>
#include <ZD24C1MA.h>
#define Page_Size 256
#define Delay_Param 5
extern I2C_HandleTypeDef hi2c1;
extern uint8_t ZD24C1MA_Default_I2C_Addr ;
void ZD24C1MA_Read(uint32_t addr, uint8_t * data, uint32_t len)
{
uint8_t ZD24C1MA_I2C_Addr;
ZD24C1MA_I2C_Addr = ZD24C1MA_Default_I2C_Addr | ((addr>>16)<<1); //highest 1-bit access address placed into I2C address
uint8_t RA[2];
RA[0] = (addr & 0xFF00)>>8; //high 8-bit access address placed into I2C first data
RA[1] =addr & 0x00FF; //low 8-bit access address placed into I2C first data
HAL_I2C_Master_Transmit(&hi2c1, ZD24C1MA_I2C_Addr, &RA[0], 2, 2700); //Write address for read
HAL_I2C_Master_Receive(&hi2c1, ZD24C1MA_I2C_Addr, data, len, 2700); //Read data
}
void ZD24C1MA_Write(uint32_t addr, uint8_t * data, uint32_t len)
{
uint8_t ZD24C1MA_I2C_Addr;
uint32_t addr_page = addr/Page_Size;
uint32_t addr_index = addr%Page_Size;
uint32_t TLEN;
uint8_t TAD[Page_Size+2];
uint32_t i=0;
if(len<=(Page_Size-addr_index))
{
TAD[0] = (addr & 0xFF00) >> 8;
TAD[1] = addr & 0x00FF ;
memcpy(TAD+2, data, len);
ZD24C1MA_I2C_Addr = ZD24C1MA_Default_I2C_Addr | ((addr>>16)<<1); //highest 1-bit access address placed into I2C address
HAL_I2C_Master_Transmit(&hi2c1, ZD24C1MA_I2C_Addr, TAD, len+2, 2700); //Write data
PY_Delay_us_t(Delay_Param*1000);
}
else
{
TAD[0] = (addr & 0xFF00) >> 8;
TAD[1] = addr & 0x00FF ;
memcpy(TAD+2, data, (Page_Size-addr_index));
ZD24C1MA_I2C_Addr = ZD24C1MA_Default_I2C_Addr | ((addr>>16)<<1); //highest 1-bit access address placed into I2C address
HAL_I2C_Master_Transmit(&hi2c1, ZD24C1MA_I2C_Addr, TAD, (Page_Size-addr_index)+2, 2700); //Write data
PY_Delay_us_t(Delay_Param*1000);
TLEN = (len-(Page_Size-addr_index));
while( TLEN >= Page_Size )
{
addr_page += 1;
TAD[0] = ((addr_page*Page_Size) & 0xFF00 ) >> 8;
TAD[1] = (addr_page*Page_Size) & 0x00FF ;
memcpy(TAD+2, data + (Page_Size-addr_index) + i*Page_Size, Page_Size);
ZD24C1MA_I2C_Addr = ZD24C1MA_Default_I2C_Addr | (((addr_page*Page_Size)>>16)<<1); //highest 1-bit access address placed into I2C address
HAL_I2C_Master_Transmit(&hi2c1, ZD24C1MA_I2C_Addr, TAD, Page_Size+2, 2700); //Write data
HAL_Delay(Delay_Param);
i++;
TLEN -= Page_Size;
PY_Delay_us_t(Delay_Param*1000);
}
if(TLEN>0)
{
addr_page += 1;
TAD[0] = ((addr_page*Page_Size) & 0xFF00 ) >> 8;
TAD[1] = (addr_page*Page_Size) & 0x00FF ;
memcpy(TAD+2, data + (Page_Size-addr_index) + i*Page_Size, TLEN);
ZD24C1MA_I2C_Addr = ZD24C1MA_Default_I2C_Addr | (((addr_page*Page_Size)>>16)<<1); //highest 1-bit access address placed into I2C address
HAL_I2C_Master_Transmit(&hi2c1, ZD24C1MA_I2C_Addr, TAD, TLEN+2, 2700); //Write data
PY_Delay_us_t(Delay_Param*1000);
}
}
}
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"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <string.h>
#include <ZD24C1MA.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* 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 ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;
UART_HandleTypeDef huart1;
/* 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);
static void MX_USART1_UART_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 length
uint8_t ZD24C1MA_Default_I2C_Addr = 0xA0; //Pin A2=A1=0
uint32_t ZD24C1MA_Access_Addr = 0; //ZD24C1MA access address (17-bit)
uint8_t testdata[256];
uint8_t URX;
/* 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_USART1_UART_Init();
/* USER CODE BEGIN 2 */
PY_usDelayTest();
PY_usDelayOptimize();
HAL_UART_Receive_IT(&huart1, &URX, 1);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if(cmd==1)
{
cmd=0;
for(uint32_t j=0; j<256; j++)
{
testdata[j] = j;
}
ZD24C1MA_Access_Addr = 0; //Set access address here
ZD24C1MA_Write(ZD24C1MA_Access_Addr, testdata, 256); //Write data
memset(testdata, 0, 256);
ZD24C1MA_Read(ZD24C1MA_Access_Addr, testdata, 256); //Read data
HAL_UART_Transmit(&huart1, testdata, 256, 2700);
}
if(cmd==2)
{
cmd=0;
for(uint32_t j=0; j<256; j++)
{
testdata[j] = 255-j;
}
ZD24C1MA_Access_Addr = 600; //Set access address here
ZD24C1MA_Write(ZD24C1MA_Access_Addr, testdata, 256); //Write data
memset(testdata, 0, 256);
ZD24C1MA_Read(ZD24C1MA_Access_Addr, testdata, 256); //Read data
HAL_UART_Transmit(&huart1, testdata, 256, 2700);
}
PY_Delay_us_t(100);
/* 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 USART1 Initialization Function
* @param None
* @retval None
*/
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_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 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if(huart==&huart1)
{
cmd = URX;
HAL_UART_Receive_IT(&huart1, &URX, 1);
}
}
/* 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：
指令0x01不跨页写读：
指令0x02跨页写读：
STM32例程下载
STM32F401CCU6 I2C总线读写EEPROM ZD24C1MA例程
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