Question
Unable to perform read in AT24c256
Posted on April 08, 2018 at 12:36
Iam trying to write and read to eeprom . I think i have wrote , in the code i have commended out the write function.
Now am trying to read, but the rxne is alwys reset
Please tell the correct usage of the functions for read and write
/**********************************************
*//* Includes ------------------------------------------------------------------*/
#include 'main.h' #include 'stm32f0xx_rcc.h' #include 'stm32f0xx_gpio.h' #include 'stm32f0xx_i2c.h' /** @addtogroup STM32F0xx_StdPeriph_Templates * @{ *//* Private typedef -----------------------------------------------------------*/
#define EEPROM_ADDRESS_R 0xA1 #define EEPROM_ADDRESS_W 0xA0 #define EE_WRITE_ADDRESS 0x52AB /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ uint8_t databuffer=0xAA; char dataread; /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*//**
* @brief Main program. * @param None * @retval None */ int main(void) {/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup file (startup_stm32f0xx.s) before to branch to application main. To reconfigure the default setting of SystemInit() function, refer to system_stm32f0xx.c file */ /* Add your application code here */ //clocks enable RCC_I2CCLKConfig(RCC_I2C1CLK_HSI); RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2,ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB,ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC,ENABLE); GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_1; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; GPIO_Init(GPIOC,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_1; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; GPIO_Init(GPIOC,&GPIO_InitStructure); I2C_DeInit(I2C2); GPIO_InitTypeDef I2C_GPIO_CONGIG; I2C_GPIO_CONGIG.GPIO_Pin=GPIO_Pin_10; I2C_GPIO_CONGIG.GPIO_Mode=GPIO_Mode_AF; I2C_GPIO_CONGIG.GPIO_OType=GPIO_OType_OD; I2C_GPIO_CONGIG.GPIO_PuPd=GPIO_PuPd_NOPULL; I2C_GPIO_CONGIG.GPIO_Speed=GPIO_Speed_2MHz; GPIO_Init(GPIOB,&I2C_GPIO_CONGIG); //SCL I2C_GPIO_CONGIG.GPIO_Pin=GPIO_Pin_11; GPIO_Init(GPIOB,&I2C_GPIO_CONGIG); //SDA GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_1); GPIO_PinAFConfig(GPIOB,GPIO_PinSource11,GPIO_AF_1); //I2C config I2C_InitTypeDef I2C_InitStructure; I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable; I2C_InitStructure.I2C_DigitalFilter = 0x00; I2C_InitStructure.I2C_OwnAddress1 = 0x00; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStructure.I2C_Timing = 0x00201D2B; // I2C_InitStructure.I2C_Timing = 0x1042C3C7; I2C_Init(I2C2,&I2C_InitStructure); //I2c enable I2C_Cmd(I2C2,ENABLE); //I2C_GenerateSTART(I2C2,ENABLE); while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) == SET) {}/* Configure slave address, nbytes, reload and generate start */
I2C_TransferHandling(I2C2, EEPROM_ADDRESS_W, 2, I2C_Reload_Mode, I2C_No_StartStop); I2C_GenerateSTART(I2C2,ENABLE); /* Wait until TXIS flag is set */ while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET) { } /* Send MSB of memory address */ I2C_SendData(I2C2, (uint8_t)((EE_WRITE_ADDRESS & 0xFF00) >> 8)); /* Wait until TXIS flag is set */ while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET) { } /* Send LSB of memory address */ I2C_SendData(I2C2, (uint8_t)(EE_WRITE_ADDRESS & 0x00FF)); /* Wait until TCR flag is set */ while(I2C_GetFlagStatus(I2C2, I2C_ISR_TCR) == RESET) {GPIO_WriteBit(GPIOC,GPIO_Pin_9,Bit_SET); }GPIO_WriteBit(GPIOC,GPIO_Pin_9,Bit_RESET);//WRITE
// I2C_TransferHandling(I2C2, EEPROM_ADDRESS_W, 1, I2C_SoftEnd_Mode, I2C_No_StartStop); // // while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET) // { // // GPIO_WriteBit(GPIOC,GPIO_Pin_8,Bit_SET); // } // GPIO_WriteBit(GPIOC,GPIO_Pin_8,Bit_RESET); // // I2C_SendData(I2C2, databuffer); // //READI2C_SlaveAddressConfig(I2C2,EEPROM_ADDRESS_W);
I2C_ReloadCmd(I2C2,DISABLE); I2C_AutoEndCmd(I2C2,ENABLE); I2C_NumberOfBytesConfig(I2C2,1); I2C_MasterRequestConfig(I2C2,I2C_Direction_Receiver);//Here i tried below function..it also didnt work//PLEASE HELP HERE
//I2C_TransferHandling(I2C2, EEPROM_ADDRESS_R, 1, I2C_SoftEnd_Mode, I2C_No_StartStop); I2C_GenerateSTART(I2C2,ENABLE); while(I2C_GetFlagStatus(I2C2, I2C_ISR_RXNE) == RESET) {GPIO_WriteBit(GPIOC,GPIO_Pin_8,Bit_SET); } GPIO_WriteBit(GPIOC,GPIO_Pin_8,Bit_RESET); /* Read data from RXDR */ dataread= I2C_ReceiveData(I2C2); I2C_GenerateSTOP(I2C2,ENABLE); /* Wait until STOPF flag is set */ while(I2C_GetFlagStatus(I2C2, I2C_ISR_STOPF) == RESET) {GPIO_WriteBit(GPIOC,GPIO_Pin_9,Bit_SET); } GPIO_WriteBit(GPIOC,GPIO_Pin_9,Bit_RESET); /* Clear STOPF flag */ I2C_ClearFlag(I2C2, I2C_ICR_STOPCF); while (1) {}
} #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 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) *//* Infinite loop */
while (1) { } } #endif/**
* @} */ Note: this post was migrated and contained many threaded conversations, some content may be missing.