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/**
******************************************************************************
* @file I2C/I2C_TwoBoards_RestartAdvComIT/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use STM32F4xx I2C HAL API to transmit
* and receive a data buffer with a communication process based on
* IT transfer and with a repeated start condition between the transmit
* and receive process..
* The communication is done using 2 Boards.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#if defined(__GNUC__)
#include <stdio.h> /*rtt*/
#include <stdlib.h> /*rtt*/
#endif
#include "main.h"
/** @addtogroup STM32F4xx_HAL_Examples
* @{
*/
/** @addtogroup I2C_TwoBoards_RestartAdvComIT
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Uncomment this line to use the board as master, if not it is used as slave */
#define MASTER_BOARD
#define I2C_ADDRESS 0x3C /* Real 7 bits slave address value in Datasheet is: b0011110
mean in uint8_t equivalent at 0x1E and this value can be
seen in the OAR1 register in bits ADD[1:7] */
/**
* @brief Defines related to Slave process
*/
#define SLAVE_CHIP_NAME 0
#define SLAVE_CHIP_REVISION 1
#define SLAVE_LAST_INFO SLAVE_CHIP_REVISION
/**
* @brief Defines related to Timeout to keep Leds status
*/
#define LED_STATUS_TIMEOUT 1000 /* 1 Second */
/**
* @brief Defines related to I2C clock speed
*/
/* I2C SPEEDCLOCK define to max value: 400 KHz on STM32F4xx*/
#define I2C_SPEEDCLOCK 400000
#define I2C_DUTYCYCLE I2C_DUTYCYCLE_2
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* I2C handler declaration */
I2C_HandleTypeDef I2cHandle;
/**
* @brief Variables related to Master process
*/
/* aCommandCode declaration array */
/* [CommandCode][RequestSlaveAnswer] */
/* {CODE, YES/NO} */
const char* aCommandCode[4][4] = {
{"CHIP_NAME", "YES"},
{"CHIP_REVISION", "YES"},
{"LOW_POWER", "NO"},
{"WAKE_UP", "NO"}};
uint8_t* pMasterTransmitBuffer = (uint8_t*)(&aCommandCode[0]);
uint8_t ubMasterNbCommandCode = sizeof(aCommandCode[0][0]);
uint8_t aMasterReceiveBuffer[0xF] = {0};
__IO uint8_t ubMasterNbDataToReceive = sizeof(aMasterReceiveBuffer);
__IO uint8_t ubMasterNbDataToTransmit = 0;
uint8_t ubMasterCommandIndex = 0;
__IO uint8_t ubMasterReceiveIndex = 0;
/**
* @brief Variables related to Slave process
*/
const char* aSlaveInfo[] = {
"STM32F401xx",
"1.2.3"};
uint8_t aSlaveReceiveBuffer[0xF] = {0};
uint8_t* pSlaveTransmitBuffer = 0;
__IO uint8_t ubSlaveNbDataToTransmit = 0;
uint8_t ubSlaveInfoIndex = 0xFF;
__IO uint8_t ubSlaveReceiveIndex = 0;
__IO uint32_t uwTransferDirection = 0;
__IO uint32_t uwTransferInitiated = 0;
__IO uint32_t uwTransferEnded = 0;
/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void FlushBuffer8(uint8_t* pBuffer1, uint16_t BufferLength);
static void Error_Handler(void);
#if defined(__GNUC__) && defined(MASTER_BOARD)
extern void initialise_monitor_handles(void); /*rtt*/
#endif
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
#if defined(__GNUC__) && defined(MASTER_BOARD)
initialise_monitor_handles(); /*rtt*/
#endif
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 84 MHz */
SystemClock_Config();
/* Configure LED4, LED6, LED3 and LED5 */
BSP_LED_Init(LED4);
BSP_LED_Init(LED6);
BSP_LED_Init(LED3);
BSP_LED_Init(LED5);
/*##-1- Configure the I2C peripheral ######################################*/
I2cHandle.Instance = I2Cx;
I2cHandle.Init.ClockSpeed = I2C_SPEEDCLOCK;
I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE;
I2cHandle.Init.OwnAddress1 = I2C_ADDRESS;
I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
I2cHandle.Init.OwnAddress2 = 0xFE;
I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if(HAL_I2C_Init(&I2cHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
#ifdef MASTER_BOARD
/* Configure User push-button button */
BSP_PB_Init(BUTTON_KEY,BUTTON_MODE_GPIO);
/* Infinite loop */
while (1)
{
/* Wait for User push-button press before starting the Communication */
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_SET)
{
}
/* Wait for User push-button release before starting the Communication */
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
{
}
/* The board sends the message and expects to receive it back if necessary. */
/* If Master no request a Slave answer, Run master in transmitter mode only. */
if(strncmp(aCommandCode[ubMasterCommandIndex][1], "NO", 2) == 0)
{
/*##-2- Start the transmission process #####################################*/
/* Master prepare and send the transmission buffer ("pMasterTransmitBuffer")
through a "New" communication frame. The communication will be stopped at
the end of transmission process thanks to "I2C_FIRST_AND_LAST_FRAME" option usage. */
pMasterTransmitBuffer = (uint8_t*)(aCommandCode[ubMasterCommandIndex][0]);
ubMasterNbDataToTransmit = strlen((char *)(aCommandCode[ubMasterCommandIndex][0]));
/* Handle I2C events (Master Transmit only) */
while(HAL_I2C_Master_Seq_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, pMasterTransmitBuffer, ubMasterNbDataToTransmit, I2C_FIRST_AND_LAST_FRAME)!= HAL_OK)
{
/* Error_Handler() function is called when Timeout error occurs.
When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
if (HAL_I2C_GetError(&I2cHandle) != HAL_I2C_ERROR_AF)
{
Error_Handler();
}
}
/*##-3- Wait for the end of the transmission transfer ##################*/
/* For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/*##-4- Monitor Status through Terminal I/O ##############################*/
/* Display through external Terminal IO the Command Code acknowledge by Slave device */
printf("Slave goes to %s.\n", (char*)(aCommandCode[ubMasterCommandIndex][0]));
}
/* Else Master request a Slave answer, Run master in transmitter mode then receiver mode. */
else
{
/*##-2- Start the transmission process #####################################*/
/* Master prepare and send the transmission buffer ("pMasterTransmitBuffer")
through a "New" communication frame. The communication will not stopped thanks
to "I2C_FIRST_FRAME" option usage. This will allow to generate a restart condition
after change the I2C peripheral from transmission process to reception process */
pMasterTransmitBuffer = (uint8_t*)(aCommandCode[ubMasterCommandIndex][0]);
ubMasterNbDataToTransmit = strlen((char *)(aCommandCode[ubMasterCommandIndex][0]));
/* Handle I2C events (Master Transmit only) */
while(HAL_I2C_Master_Seq_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, pMasterTransmitBuffer, ubMasterNbDataToTransmit, I2C_FIRST_FRAME)!= HAL_OK)
{
/* Error_Handler() function is called when Timeout error occurs.
When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
if (HAL_I2C_GetError(&I2cHandle) != HAL_I2C_ERROR_AF)
{
Error_Handler();
}
}
/*##-3- Wait for the end of the transfer ###################################*/
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/*##-4- Put I2C peripheral in reception process ###########################*/
/* Master generate a restart condition and then change the I2C peripheral
from transmission process to reception process, to retrieve information
data from Slave device. */
while(HAL_I2C_Master_Seq_Receive_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, aMasterReceiveBuffer, strlen((char *)(aSlaveInfo[ubMasterCommandIndex])), I2C_LAST_FRAME)!= HAL_OK)
{
/* Error_Handler() function is called when Timeout error occurs.
When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
if (HAL_I2C_GetError(&I2cHandle) != HAL_I2C_ERROR_AF)
{
Error_Handler();
}
}
/*##-5- Wait for the end of the transfer ###################################*/
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/*##-6- Monitor Status through Terminal I/O ##############################*/
/* Display through external Terminal IO the Slave Answer received */
printf("%s : %s\n", (char*)(aCommandCode[ubMasterCommandIndex][0]), (char*)aMasterReceiveBuffer);
}
/* Prepare Index to send next command code */
ubMasterCommandIndex++;
if(ubMasterCommandIndex >= ubMasterNbCommandCode)
{
ubMasterCommandIndex = 0;
}
/* For User help, keep Leds status until timeout */
HAL_Delay(LED_STATUS_TIMEOUT);
/* Then Clear and Reset process variables, arrays and Leds status, for next transfer */
FlushBuffer8(aMasterReceiveBuffer, COUNTOF(aMasterReceiveBuffer));
ubMasterNbDataToTransmit = 0;
ubMasterReceiveIndex = 0;
BSP_LED_Off(LED4);
BSP_LED_Off(LED6);
#else /* SLAVE_BOARD */
/* Infinite loop */
while (1)
{
/*##-2- Put I2C peripheral in Listen address match code process ##########*/
/* This action will allow I2C periphal to able to treat Master request when
necessary depending of transfer direction requested by Master */
if(HAL_I2C_EnableListen_IT(&I2cHandle) != HAL_OK)
{
/* Transfer error in reception process */
Error_Handler();
}
/*##-3- Wait for a new frame communication with a Master #################*/
/* Before starting a transfer, you need to wait a Master request event.
For simplicity reasons, this example is just waiting till an Address callback event,
but application may perform other tasks while transfer operation is ongoing. */
while(uwTransferInitiated != 1)
{
}
/*##-4- Wait for the end of the frame communication ######################*/
/* Before ending a transfer, you need to wait a Master end event.
For simplicity reasons, this example is just waiting till an Stop condition event,
but application may perform other tasks while transfer operation is ongoing. */
while(uwTransferEnded != 1)
{
}
/* For User help, keep Leds status until timeout */
HAL_Delay(LED_STATUS_TIMEOUT);
/*##-5- Clear, reset process variables, arrays and Leds status ###########*/
FlushBuffer8(aSlaveReceiveBuffer, COUNTOF(aSlaveReceiveBuffer));
uwTransferInitiated = 0;
uwTransferEnded = 0;
ubSlaveReceiveIndex = 0;
ubSlaveInfoIndex = 0xFF;
BSP_LED_Off(LED4);
BSP_LED_Off(LED6);
#endif /* MASTER_BOARD */
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 84000000
* HCLK(Hz) = 84000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 336
* PLL_P = 4
* PLL_Q = 7
* VDD(V) = 3.3
* Main regulator output voltage = Scale2 mode
* Flash Latency(WS) = 2
* @param None
* @retval None
*/
static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
/* Enable HSE Oscillator and activate PLL with HSE as source */
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 = 8;
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)
{
/* Initialization Error */
Error_Handler();
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | 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)
{
/* Initialization Error */
Error_Handler();
}
}
/**
* @brief Tx Transfer completed callback.
* @param I2cHandle: I2C handle
* @note This example shows a simple way to report end of IT Tx transfer, and
* you can add your own implementation.
* @retval None
*/
#ifdef MASTER_BOARD
void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
/* Turn LED4 on: Transfer in transmission process is correct */
BSP_LED_On(LED4);
}
#else
void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
/* Turn LED4 on: Transfer in transmission process is correct */
BSP_LED_On(LED4);
}
#endif /* MASTER_BOARD */
/**
* @brief Rx Transfer completed callback.
* @param I2cHandle: I2C handle
* @note This example shows a simple way to report end of IT Rx transfer, and
* you can add your own implementation.
* @retval None
*/
#ifdef MASTER_BOARD
void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
/* Turn LED6 on: Transfer in reception process is correct */
BSP_LED_On(LED6);
}
#else
void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
/* Turn LED6 on: Transfer in reception process is correct */
BSP_LED_On(LED6);
/* Check Command code receive previously */
/* If data received match with a Internal Command Code, set the associated index */
/* Which will use for Transmission process if requested by Master */
if(strcmp((char *)(aSlaveReceiveBuffer), (char *)(aCommandCode[0][0])) == 0)
{
ubSlaveInfoIndex = SLAVE_CHIP_NAME;
}
else if(strcmp((char *)(aSlaveReceiveBuffer), (char *)(aCommandCode[1][0])) == 0)
{
ubSlaveInfoIndex = SLAVE_CHIP_REVISION;
}
else
{
if(HAL_I2C_Slave_Seq_Receive_IT(I2cHandle, &aSlaveReceiveBuffer[ubSlaveReceiveIndex], 1, I2C_FIRST_FRAME) != HAL_OK)
{
Error_Handler();
}
ubSlaveReceiveIndex++;
}
}
#endif /* MASTER_BOARD */
#ifndef MASTER_BOARD
/**
* @brief Slave Address Match callback.
* @param hi2c Pointer to a I2C_HandleTypeDef structure that contains
* the configuration information for the specified I2C.
* @param TransferDirection: Master request Transfer Direction (Write/Read), value of @ref I2C_XferOptions_definition
* @param AddrMatchCode: Address Match Code
* @retval None
*/
void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode)
{
if(AddrMatchCode == I2C_ADDRESS)
{
uwTransferInitiated = 1;
uwTransferDirection = TransferDirection;
/* A new communication with a Master is initiated */
/* Turn LED3 On: A Communication is initiated */
BSP_LED_On(LED3);
/* First of all, check the transfer direction to call the correct Slave Interface */
if(uwTransferDirection == I2C_DIRECTION_TRANSMIT)
{
if(HAL_I2C_Slave_Seq_Receive_IT(&I2cHandle, &aSlaveReceiveBuffer[ubSlaveReceiveIndex], 1, I2C_FIRST_FRAME) != HAL_OK)
{
Error_Handler();
}
ubSlaveReceiveIndex++;
}
else
{
pSlaveTransmitBuffer = (uint8_t*)(aSlaveInfo[ubSlaveInfoIndex]);
ubSlaveNbDataToTransmit = strlen((char *)(aSlaveInfo[ubSlaveInfoIndex]));
if(HAL_I2C_Slave_Seq_Transmit_IT(&I2cHandle, pSlaveTransmitBuffer, ubSlaveNbDataToTransmit, I2C_LAST_FRAME) != HAL_OK)
{
Error_Handler();
}
}
}
else
{
/* Call Error Handler, Wrong Address Match Code */
Error_Handler();
}
}
/**
* @brief Listen Complete callback.
* @param hi2c Pointer to a I2C_HandleTypeDef structure that contains
* the configuration information for the specified I2C.
* @retval None
*/
void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c)
{
uwTransferEnded = 1;
/* Turn LED3 off: Communication is completed */
BSP_LED_Off(LED3);
}
#endif
/**
* @brief I2C error callbacks.
* @param I2cHandle: I2C handle
* @note This example shows a simple way to report transfer error, and you can
* add your own implementation.
* @retval None
*/
void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *I2cHandle)
{
/** Error_Handler() function is called when error occurs.
* 1- When Slave don't acknowledge it's address, Master restarts communication.
* 2- When Master don't acknowledge the last data transferred, Slave don't care in this example.
*/
if (HAL_I2C_GetError(I2cHandle) != HAL_I2C_ERROR_AF)
{
Error_Handler();
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Turn Off LED4 */
BSP_LED_Off(LED4);
/* Turn Off LED6 */
BSP_LED_Off(LED6);
/* Turn Off LED3 */
BSP_LED_Off(LED3);
/* Turn On LED5 */
BSP_LED_On(LED5);
while(1)
{
}
}
/**
* @brief Flush 8-bit buffer.
* @param pBuffer1: pointer to the buffer to be flushed.
* @param BufferLength: buffer's length
* @retval None
*/
static void FlushBuffer8(uint8_t* pBuffer1, uint16_t BufferLength)
{
uint8_t Index = 0;
for (Index = 0; Index < BufferLength; Index++)
{
pBuffer1[Index] = 0;
}
}
#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
/**
* @}
*/
/**
* @}
*/
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