493 lines
16 KiB
C
493 lines
16 KiB
C
/**
|
||
******************************************************************************
|
||
* @file I2C/I2C_TwoBoards_RestartComIT/Src/main.c
|
||
* @author MCD Application Team
|
||
* @brief This sample code shows how to use STM32F1xx 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 ------------------------------------------------------------------*/
|
||
#include "main.h"
|
||
|
||
/** @addtogroup STM32F1xx_HAL_Examples
|
||
* @{
|
||
*/
|
||
|
||
/** @addtogroup I2C_TwoBoards_RestartComIT
|
||
* @{
|
||
*/
|
||
|
||
/* 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 0x30F
|
||
|
||
/* I2C SPEEDCLOCK define to max value: 400 KHz on STM32F1xx*/
|
||
#define I2C_SPEEDCLOCK 400000
|
||
#define I2C_DUTYCYCLE I2C_DUTYCYCLE_2
|
||
/* Private macro -------------------------------------------------------------*/
|
||
/* Private variables ---------------------------------------------------------*/
|
||
/* I2C handler declaration */
|
||
I2C_HandleTypeDef I2cHandle;
|
||
|
||
/* Buffer used for transmission */
|
||
uint8_t aTxBuffer[] = " ****I2C_TwoBoards advanced communication based on IT**** ****I2C_TwoBoards advanced communication based on IT**** ****I2C_TwoBoards advanced communication based on IT**** ";
|
||
|
||
/* Buffer used for reception */
|
||
uint8_t aRxBuffer[RXBUFFERSIZE];
|
||
|
||
#ifndef MASTER_BOARD
|
||
/* Variable used to trig an address match code event */
|
||
__IO uint32_t uwTransferReadRequested = 0;
|
||
__IO uint32_t uwTransferWriteRequested = 0;
|
||
#endif
|
||
|
||
/* Private function prototypes -----------------------------------------------*/
|
||
void SystemClock_Config(void);
|
||
static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);
|
||
static void Error_Handler(void);
|
||
|
||
/* Private functions ---------------------------------------------------------*/
|
||
|
||
/**
|
||
* @brief Main program
|
||
* @param None
|
||
* @retval None
|
||
*/
|
||
int main(void)
|
||
{
|
||
/* STM32F1xx 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 64 MHz */
|
||
SystemClock_Config();
|
||
|
||
/* Configure LED2 */
|
||
BSP_LED_Init(LED2);
|
||
|
||
|
||
/*##-1- Configure the I2C peripheral ######################################*/
|
||
I2cHandle.Instance = I2Cx;
|
||
I2cHandle.Init.ClockSpeed = I2C_SPEEDCLOCK;
|
||
I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE;
|
||
I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_10BIT;
|
||
I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
|
||
I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
|
||
I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
|
||
I2cHandle.Init.OwnAddress1 = I2C_ADDRESS;
|
||
I2cHandle.Init.OwnAddress2 = 0xFF;
|
||
|
||
if(HAL_I2C_Init(&I2cHandle) != HAL_OK)
|
||
{
|
||
/* Initialization Error */
|
||
Error_Handler();
|
||
}
|
||
|
||
|
||
#ifdef MASTER_BOARD
|
||
|
||
/* Configure Key push-button */
|
||
BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO);
|
||
|
||
/* Wait for Key push-button press before starting the Communication */
|
||
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
|
||
{
|
||
}
|
||
|
||
/* Wait for Key push-button release before starting the Communication */
|
||
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_SET)
|
||
{
|
||
}
|
||
|
||
/* The board sends the message and expects to receive it back */
|
||
|
||
/*##-2- Start the transmission process #####################################*/
|
||
/* While the I2C in reception process, user can transmit data through
|
||
"aTxBuffer" buffer */
|
||
do
|
||
{
|
||
if(HAL_I2C_Master_Seq_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE, I2C_FIRST_FRAME)!= HAL_OK)
|
||
{
|
||
/* Error_Handler() function is called when error occurs. */
|
||
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<69>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)
|
||
{
|
||
}
|
||
|
||
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
|
||
Master restarts communication */
|
||
}
|
||
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
|
||
|
||
/* Wait for Key push-button press before starting the Communication */
|
||
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
|
||
{
|
||
}
|
||
|
||
/* Wait for Key push-button release before starting the Communication */
|
||
while (BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_SET)
|
||
{
|
||
}
|
||
|
||
/*##-4- Put I2C peripheral in reception process ############################*/
|
||
do
|
||
{
|
||
if(HAL_I2C_Master_Seq_Receive_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE, I2C_LAST_FRAME) != HAL_OK)
|
||
{
|
||
/* Error_Handler() function is called when error occurs. */
|
||
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<69>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)
|
||
{
|
||
}
|
||
|
||
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
|
||
Master restarts communication */
|
||
}
|
||
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
|
||
|
||
#else
|
||
|
||
/* The board receives the message and sends it back */
|
||
|
||
/*##-3- Put I2C peripheral in listen mode process ###########################*/
|
||
if(HAL_I2C_EnableListen_IT(&I2cHandle) != HAL_OK)
|
||
{
|
||
/* Transfer error in reception process */
|
||
Error_Handler();
|
||
}
|
||
|
||
/*##-4- Wait Address Match Code event ######################################*/
|
||
/* 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(uwTransferReadRequested != 1)
|
||
{
|
||
}
|
||
|
||
/*##-5- Put I2C peripheral in reception process ############################*/
|
||
if(HAL_I2C_Slave_Seq_Receive_IT(&I2cHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE, I2C_FIRST_FRAME) != HAL_OK)
|
||
{
|
||
/* Transfer error in reception process */
|
||
Error_Handler();
|
||
}
|
||
|
||
/*##-6- 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<69>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_LISTEN)
|
||
{
|
||
}
|
||
|
||
/*##-7- Wait Address Match Code event ######################################*/
|
||
/* 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(uwTransferWriteRequested != 1)
|
||
{
|
||
}
|
||
|
||
/*##-8- Start the transmission process #####################################*/
|
||
/* While the I2C in reception process, user can transmit data through
|
||
"aTxBuffer" buffer */
|
||
if(HAL_I2C_Slave_Seq_Transmit_IT(&I2cHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE, I2C_LAST_FRAME)!= HAL_OK)
|
||
{
|
||
/* Transfer error in transmission process */
|
||
Error_Handler();
|
||
}
|
||
|
||
#endif /* MASTER_BOARD */
|
||
|
||
/*##-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<69>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- Compare the sent and received buffers ##############################*/
|
||
if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE))
|
||
{
|
||
/* Processing Error */
|
||
Error_Handler();
|
||
}
|
||
|
||
/* Infinite loop */
|
||
while (1)
|
||
{
|
||
}
|
||
}
|
||
|
||
/**
|
||
* @brief System Clock Configuration
|
||
* The system Clock is configured as follow :
|
||
* System Clock source = PLL (HSI)
|
||
* SYSCLK(Hz) = 64000000
|
||
* HCLK(Hz) = 64000000
|
||
* AHB Prescaler = 1
|
||
* APB1 Prescaler = 2
|
||
* APB2 Prescaler = 1
|
||
* PLLMUL = 16
|
||
* Flash Latency(WS) = 2
|
||
* @param None
|
||
* @retval None
|
||
*/
|
||
void SystemClock_Config(void)
|
||
{
|
||
RCC_ClkInitTypeDef clkinitstruct = {0};
|
||
RCC_OscInitTypeDef oscinitstruct = {0};
|
||
|
||
/* Configure PLL ------------------------------------------------------*/
|
||
/* PLL configuration: PLLCLK = (HSI / 2) * PLLMUL = (8 / 2) * 16 = 64 MHz */
|
||
/* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 64 / 1 = 64 MHz */
|
||
/* Enable HSI and activate PLL with HSi_DIV2 as source */
|
||
oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
|
||
oscinitstruct.HSEState = RCC_HSE_OFF;
|
||
oscinitstruct.LSEState = RCC_LSE_OFF;
|
||
oscinitstruct.HSIState = RCC_HSI_ON;
|
||
oscinitstruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
|
||
oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
|
||
oscinitstruct.PLL.PLLState = RCC_PLL_ON;
|
||
oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
|
||
oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL16;
|
||
if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
|
||
{
|
||
/* Initialization Error */
|
||
while(1);
|
||
}
|
||
|
||
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
|
||
clocks dividers */
|
||
clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
|
||
clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
|
||
clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
|
||
clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
|
||
clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
|
||
if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
|
||
{
|
||
/* Initialization Error */
|
||
while(1);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* @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 LED2 on: Transfer in transmission process is correct */
|
||
BSP_LED_On(LED2);
|
||
}
|
||
#else
|
||
void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
|
||
{
|
||
/* Reset address match code event */
|
||
uwTransferWriteRequested = 0;
|
||
|
||
/* Turn LED2 off: Transfer in transmission process is correct */
|
||
BSP_LED_Off(LED2);
|
||
}
|
||
#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 LED2 off: Transfer in reception process is correct */
|
||
BSP_LED_Off(LED2);
|
||
}
|
||
#else
|
||
void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
|
||
{
|
||
/* Reset address match code event */
|
||
uwTransferReadRequested = 0;
|
||
|
||
/* Turn LED2 on: Transfer in reception process is correct */
|
||
BSP_LED_On(LED2);
|
||
}
|
||
#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_XferDirection_definition
|
||
* @param AddrMatchCode: Address Match Code
|
||
* @retval None
|
||
*/
|
||
void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode)
|
||
{
|
||
if(TransferDirection == I2C_DIRECTION_TRANSMIT)
|
||
{
|
||
uwTransferReadRequested = 1;
|
||
}
|
||
else if(TransferDirection == I2C_DIRECTION_RECEIVE)
|
||
{
|
||
uwTransferWriteRequested = 1;
|
||
}
|
||
|
||
/* A new communication with a Master is initiated */
|
||
/* Turn LED2 On: A Communication is initiated */
|
||
BSP_LED_On(LED2);
|
||
}
|
||
|
||
/**
|
||
* @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)
|
||
{
|
||
/* Turn LED2 off: Communication is completed */
|
||
BSP_LED_Off(LED2);
|
||
}
|
||
#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 doesn't acknowledge its address, Master restarts communication.
|
||
* 2- When Master doesn't acknowledge the last data transferred, Slave doesn'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)
|
||
{
|
||
/* Error if LED2 is slowly blinking (1 sec. period) */
|
||
while(1)
|
||
{
|
||
BSP_LED_Toggle(LED2);
|
||
HAL_Delay(1000);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* @brief Compares two buffers.
|
||
* @param pBuffer1, pBuffer2: buffers to be compared.
|
||
* @param BufferLength: buffer's length
|
||
* @retval 0 : pBuffer1 identical to pBuffer2
|
||
* >0 : pBuffer1 differs from pBuffer2
|
||
*/
|
||
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
|
||
{
|
||
while (BufferLength--)
|
||
{
|
||
if ((*pBuffer1) != *pBuffer2)
|
||
{
|
||
return BufferLength;
|
||
}
|
||
pBuffer1++;
|
||
pBuffer2++;
|
||
}
|
||
|
||
return 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
|
||
|
||
|
||
/**
|
||
* @}
|
||
*/
|
||
|
||
/**
|
||
* @}
|
||
*/
|