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/**
******************************************************************************
* @file Examples_LL/I2C/I2C_TwoBoards_MasterTx_SlaveRx_DMA/Src/main.c
* @author MCD Application Team
* @brief This example describes how to send/receive bytes over I2C IP using
* the STM32F4xx I2C LL API.
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @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 STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup I2C_TwoBoards_MasterTx_SlaveRx_DMA
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/**
* @brief Timeout value
*/
#if (USE_TIMEOUT == 1)
#define DMA_SEND_TIMEOUT_TC_MS 5
#ifdef SLAVE_BOARD
#define I2C_SEND_TIMEOUT_STOP_MS 5
#else /* MASTER BOARD */
#define I2C_SEND_TIMEOUT_TXE_MS 5
#define I2C_SEND_TIMEOUT_SB_MS 5
#define I2C_SEND_TIMEOUT_ADDR_MS 5
#endif
#endif /* USE_TIMEOUT */
/**
* @brief I2C devices settings
*/
/* I2C SPEEDCLOCK define to max value: Fast Mode @400kHz */
#define I2C_SPEEDCLOCK 400000
#define I2C_DUTYCYCLE LL_I2C_DUTYCYCLE_2
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#if (USE_TIMEOUT == 1)
uint32_t Timeout = 0; /* Variable used for Timeout management */
#endif /* USE_TIMEOUT */
const uint8_t aLedOn[] = "LED ON";
/**
* @brief Variables related to SlaveReceive process
*/
__IO uint8_t ubNbDataToReceive = sizeof(aLedOn);
uint8_t aReceiveBuffer[sizeof(aLedOn)] = {0};
__IO uint8_t ubSlaveTransferComplete = 0;
/**
* @brief Variables related to MasterTransmit process
*/
__IO uint8_t ubNbDataToTransmit = sizeof(aLedOn);
uint8_t* pTransmitBuffer = (uint8_t*)aLedOn;
__IO uint8_t ubMasterTransferComplete = 0;
/**
* @brief Variables related to MasterReceive and SlaveTransmit process
*/
__IO uint8_t ubButtonPress = 0;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void LED_Init(void);
void LED_On(void);
void LED_Off(void);
void LED_Blinking(uint32_t Period);
void Configure_DMA(void);
void UserButton_Init(void);
void WaitForUserButtonPress(void);
#ifdef SLAVE_BOARD
void Configure_I2C_Slave(void);
void Activate_I2C_Slave(void);
void Handle_I2C_Slave(void);
uint8_t Buffercmp8(uint8_t* pBuffer1, uint8_t* pBuffer2, uint8_t BufferLength);
#else /* MASTER_BOARD */
void Configure_I2C_Master(void);
void Activate_I2C_Master(void);
void Handle_I2C_Master(void);
#endif /* SLAVE_BOARD */
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Set LED2 Off */
LED_Off();
/* Initialize User push-button in EXTI mode */
UserButton_Init();
/* Configure DMA1_Channel5 and DMA1_Channel1 (DMA IP configuration in transfer memory to peripheral (I2C1) */
Configure_DMA();
#ifdef SLAVE_BOARD
/* Configure I2C1 (I2C IP configuration in Slave mode and related GPIO initialization) */
Configure_I2C_Slave();
/* Wait for User push-button press to start transfer */
WaitForUserButtonPress();
/* Enable the I2C1 peripheral (Slave) */
Activate_I2C_Slave();
/* Handle I2C1 events (Slave) */
Handle_I2C_Slave();
#else /* MASTER_BOARD */
/* Configure I2C1 (I2C IP configuration in Master mode and related GPIO initialization) */
Configure_I2C_Master();
/* Wait for User push-button press to start transfer */
WaitForUserButtonPress();
/* Enable the I2C1 peripheral (Master) */
Activate_I2C_Master();
/* Handle I2C1 events (Master) */
Handle_I2C_Master();
#endif /* SLAVE_BOARD */
/* Infinite loop */
while (1)
{
}
}
/**
* @brief This function configures the DMA Channels for I2C1
* @note This function is used to :
* -1- Enable DMA1 clock
* -2- Configure NVIC for DMA1 transfer complete/error interrupts
* -3- Configure the DMA1_Channel5 functional parameters
* -4- Configure the DMA1_Channel1 functional parameters
* -5- Enable DMA1 interrupts complete/error
* @param None
* @retval None
*/
void Configure_DMA(void)
{
/* DMA1_Channel5 used for I2C1 Reception
* DMA1_Channel1 used for I2C1 Transmission
*/
/* (1) Enable the clock of DMA1 */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA1);
/* (2) Configure NVIC for DMA transfer complete/error interrupts */
NVIC_SetPriority(DMA1_Stream5_IRQn, 0);
NVIC_EnableIRQ(DMA1_Stream5_IRQn);
NVIC_SetPriority(DMA1_Stream1_IRQn, 0);
NVIC_EnableIRQ(DMA1_Stream1_IRQn);
/* (3) Configure the DMA1 functional parameters */
LL_DMA_SetChannelSelection(DMA1, LL_DMA_STREAM_5, LL_DMA_CHANNEL_1);
LL_DMA_ConfigTransfer(DMA1, LL_DMA_STREAM_5, LL_DMA_DIRECTION_PERIPH_TO_MEMORY | \
LL_DMA_PRIORITY_HIGH | \
LL_DMA_MODE_NORMAL | \
LL_DMA_PERIPH_NOINCREMENT | \
LL_DMA_MEMORY_INCREMENT | \
LL_DMA_PDATAALIGN_BYTE | \
LL_DMA_MDATAALIGN_BYTE);
LL_DMA_SetDataLength(DMA1, LL_DMA_STREAM_5, ubNbDataToTransmit);
LL_DMA_ConfigAddresses(DMA1, LL_DMA_STREAM_5, (uint32_t)LL_I2C_DMA_GetRegAddr(I2C1), (uint32_t)&(aReceiveBuffer), LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_STREAM_5));
/* (4) Configure the DMA1_Channel1 functional parameters */
LL_DMA_SetChannelSelection(DMA1, LL_DMA_STREAM_1, LL_DMA_CHANNEL_0);
LL_DMA_ConfigTransfer(DMA1, LL_DMA_STREAM_1, LL_DMA_DIRECTION_MEMORY_TO_PERIPH | \
LL_DMA_PRIORITY_HIGH | \
LL_DMA_MODE_NORMAL | \
LL_DMA_PERIPH_NOINCREMENT | \
LL_DMA_MEMORY_INCREMENT | \
LL_DMA_PDATAALIGN_BYTE | \
LL_DMA_MDATAALIGN_BYTE);
LL_DMA_SetDataLength(DMA1, LL_DMA_STREAM_1, ubNbDataToTransmit);
LL_DMA_ConfigAddresses(DMA1, LL_DMA_STREAM_1, (uint32_t)pTransmitBuffer, (uint32_t)LL_I2C_DMA_GetRegAddr(I2C1), LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_STREAM_1));
/* (4) Enable DMA interrupts complete/error */
LL_DMA_EnableIT_TC(DMA1, LL_DMA_STREAM_5);
LL_DMA_EnableIT_TE(DMA1, LL_DMA_STREAM_5);
LL_DMA_EnableIT_TC(DMA1, LL_DMA_STREAM_1);
LL_DMA_EnableIT_TE(DMA1, LL_DMA_STREAM_1);
}
#ifdef SLAVE_BOARD
/**
* @brief This function configures I2C1 in Slave mode.
* @note This function is used to :
* -1- Enables GPIO clock and configures the I2C1 pins.
* -2- Enable the I2C1 peripheral clock.
* -3- Configure I2C1 functional parameters.
* -4- Enable DMA reception requests.
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_I2C_Slave(void)
{
/* (1) Enables GPIO clock and configures the I2C1 pins **********************/
/* (SCL on PB.8, SDA on PB.9) **********************/
/* Enable the peripheral clock of GPIOB */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);
/* Configure SCL Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_8, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_8, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_8, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_8, LL_GPIO_PULL_UP);
/* Configure SDA Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_9, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_9, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_9, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_9, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_9, LL_GPIO_PULL_UP);
/* (2) Enable the I2C1 peripheral clock *************************************/
/* Enable the peripheral clock for I2C1 */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C1);
/* (3) Configure I2C1 functional parameters ********************************/
/* Disable I2C1 prior modifying configuration registers */
LL_I2C_Disable(I2C1);
/* Configure the Own Address1 :
* - OwnAddress1 is SLAVE_OWN_ADDRESS
* - OwnAddrSize is LL_I2C_OWNADDRESS1_7BIT
*/
LL_I2C_SetOwnAddress1(I2C1, SLAVE_OWN_ADDRESS, LL_I2C_OWNADDRESS1_7BIT);
/* Enable Clock stretching */
/* Reset Value is Clock stretching enabled */
//LL_I2C_EnableClockStretching(I2C1);
/* Enable General Call */
/* Reset Value is General Call disabled */
//LL_I2C_EnableGeneralCall(I2C1);
/* Configure the 7bits Own Address2 */
/* Reset Values of :
* - OwnAddress2 is 0x00
* - Own Address2 is disabled
*/
//LL_I2C_SetOwnAddress2(I2C1, 0x00);
//LL_I2C_DisableOwnAddress2(I2C1);
/* Enable Peripheral in I2C mode */
/* Reset Value is I2C mode */
//LL_I2C_SetMode(I2C1, LL_I2C_MODE_I2C);
/* (4) Enable DMA reception requests and I2C1 *******************************/
LL_I2C_EnableDMAReq_RX(I2C1);
}
/**
* @brief This function Activate I2C1 peripheral (Slave)
* @note This function is used to :
* -1- Enable I2C1.
* @param None
* @retval None
*/
void Activate_I2C_Slave(void)
{
/* (1) Enable I2C1 **********************************************************/
LL_I2C_Enable(I2C1);
}
#else /* MASTER_BOARD */
/**
* @brief This function configures I2C1 in Master mode.
* @note This function is used to :
* -1- Enables GPIO clock and configures the I2C1 pins.
* -2- Enable the I2C1 peripheral clock.
* -3- Configure I2C1 functional parameters.
* -4- Enable DMA transmission requests.
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_I2C_Master(void)
{
LL_RCC_ClocksTypeDef rcc_clocks;
/* (1) Enables GPIO clock and configures the I2C1 pins **********************/
/* (SCL on PB.8, SDA on PB.9) **********************/
/* Enable the peripheral clock of GPIOB */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);
/* Configure SCL Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_8, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_8, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_8, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_8, LL_GPIO_PULL_UP);
/* Configure SDA Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_9, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_9, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_9, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_9, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_9, LL_GPIO_PULL_UP);
/* (2) Enable the I2C1 peripheral clock *************************************/
/* Enable the peripheral clock for I2C1 */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C1);
/* (3) Configure I2C1 functional parameters ********************************/
/* Disable I2C1 prior modifying configuration registers */
LL_I2C_Disable(I2C1);
/* Retrieve Clock frequencies */
LL_RCC_GetSystemClocksFreq(&rcc_clocks);
/* Configure the SCL Clock Speed */
LL_I2C_ConfigSpeed(I2C1, rcc_clocks.PCLK1_Frequency, I2C_SPEEDCLOCK, I2C_DUTYCYCLE);
/* Configure the Own Address1 */
/* Reset Values of :
* - OwnAddress1 is 0x00
* - OwnAddrSize is LL_I2C_OWNADDRESS1_7BIT
*/
//LL_I2C_SetOwnAddress1(I2C1, 0x00, LL_I2C_OWNADDRESS1_7BIT);
/* Enable Clock stretching */
/* Reset Value is Clock stretching enabled */
//LL_I2C_EnableClockStretching(I2C1);
/* Enable General Call */
/* Reset Value is General Call disabled */
//LL_I2C_EnableGeneralCall(I2C1);
/* Configure the 7bits Own Address2 */
/* Reset Values of :
* - OwnAddress2 is 0x00
* - Own Address2 is disabled
*/
//LL_I2C_SetOwnAddress2(I2C1, 0x00);
//LL_I2C_DisableOwnAddress2(I2C1);
/* Enable Peripheral in I2C mode */
/* Reset Value is I2C mode */
//LL_I2C_SetMode(I2C1, LL_I2C_MODE_I2C);
/* (4) Enable DMA transmission requests and I2C1 ****************************/
LL_I2C_EnableDMAReq_TX(I2C1);
}
/**
* @brief This function Activate I2C1 peripheral (Master)
* @note This function is used to :
* -1- Enable I2C1.
* @param None
* @retval None
*/
void Activate_I2C_Master(void)
{
/* (1) Enable I2C1 **********************************************************/
LL_I2C_Enable(I2C1);
}
#endif /* SLAVE_BOARD */
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED2 Clock */
LED2_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED2 */
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
/* Reset value is LL_GPIO_PULL_NO */
//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
}
/**
* @brief Turn-on LED2.
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @brief Turn-off LED2.
* @param None
* @retval None
*/
void LED_Off(void)
{
/* Turn LED2 off */
LL_GPIO_ResetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
void LED_Blinking(uint32_t Period)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
/* Toggle IO in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(Period);
}
}
/**
* @brief Configures User push-button in GPIO or EXTI Line Mode.
* @param None
* @retval None
*/
void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Connect External Line to the GPIO*/
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger External line 13 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
}
/**
* @brief Wait for User push-button press to start transfer.
* @param None
* @retval None
*/
/* */
void WaitForUserButtonPress(void)
{
while (ubButtonPress == 0)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(LED_BLINK_FAST);
}
/* Turn LED2 off */
LL_GPIO_ResetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
#ifdef SLAVE_BOARD
/**
* @brief This Function handle Slave events to perform a reception process
* @note This function is composed in different steps :
* -1- Prepare acknowledge for Slave address reception
* -2- Wait ADDR flag and check address match code and direction
* -2.1- Enable DMA transfer(before clearing ADDR FLag).
* -3- Loop until end of transfer completed (DMA TC raised).
* -4- Loop until end of slave reception completed (STOP flag raised).
* -5- Clear pending flags, check Data consistency.
* @param None
* @retval None
*/
void Handle_I2C_Slave(void)
{
/* (1) Prepare acknowledge for Slave address reception **********************/
LL_I2C_AcknowledgeNextData(I2C1, LL_I2C_ACK);
/* (2) Wait ADDR flag and check address match code and direction ************/
while(!LL_I2C_IsActiveFlag_ADDR(I2C1))
{
}
/* Verify the transfer direction, direction at Read (mean write direction for Master), Slave enters receiver mode */
if(LL_I2C_GetTransferDirection(I2C1) == LL_I2C_DIRECTION_READ)
{
/* (1.1) Enable DMA transfer (before clearing ADDR FLag) ****************/
LL_DMA_EnableStream(DMA1, LL_DMA_STREAM_5);
/* Clear ADDR flag value in ISR register */
LL_I2C_ClearFlag_ADDR(I2C1);
}
else
{
/* Clear ADDR flag value in ISR register */
LL_I2C_ClearFlag_ADDR(I2C1);
/* Call Error function */
Error_Callback();
}
/* (3) Loop until end of transfer completed (DMA TC raised) *****************/
#if (USE_TIMEOUT == 1)
Timeout = DMA_SEND_TIMEOUT_TC_MS;
#endif /* USE_TIMEOUT */
/* Loop until DMA transfer complete event */
while(!ubSlaveTransferComplete)
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if(Timeout-- == 0)
{
/* Time-out occurred. Set LED to blinking mode */
LED_Blinking(LED_BLINK_SLOW);
}
}
#endif /* USE_TIMEOUT */
}
/* (4) Loop until end of slave reception completed (STOP flag raised) *******/
#if (USE_TIMEOUT == 1)
Timeout = I2C_SEND_TIMEOUT_STOP_MS;
#endif /* USE_TIMEOUT */
/* Loop until STOP flag is raised */
while(!LL_I2C_IsActiveFlag_STOP(I2C1))
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if(Timeout-- == 0)
{
/* Time-out occurred. Set LED2 to blinking mode */
LED_Blinking(LED_BLINK_SLOW);
}
}
#endif /* USE_TIMEOUT */
}
/* (5) Clear pending flags, Data consistency are checking into Slave process */
/* End of I2C_SlaveReceiver_MasterTransmitter_DMA Process */
LL_I2C_ClearFlag_STOP(I2C1);
/* Check if data request to turn on the LED2 */
if(Buffercmp8((uint8_t*)aReceiveBuffer, (uint8_t*)aLedOn, (ubNbDataToReceive-1)) == 0)
{
/* Turn LED2 On:
* Expected bytes have been received
* Slave Rx sequence completed successfully
*/
LED_On();
}
else
{
/* Call Error function */
Error_Callback();
}
}
/**
* @brief Compares two 8-bit buffers and returns the comparison result.
* @param pBuffer1: pointer to the source buffer to be compared to.
* @param pBuffer2: pointer to the second source buffer to be compared to the first.
* @param BufferLength: buffer's length.
* - 0: Comparison is OK (the two Buffers are identical)
* - Value different from 0: Comparison is NOK (Buffers are different)
*/
uint8_t Buffercmp8(uint8_t* pBuffer1, uint8_t* pBuffer2, uint8_t BufferLength)
{
while (BufferLength--)
{
if (*pBuffer1 != *pBuffer2)
{
return 1;
}
pBuffer1++;
pBuffer2++;
}
return 0;
}
#else /* MASTER_BOARD */
/**
* @brief This Function handle Master events to perform a transmission process
* @note This function is composed in different steps :
* -1- Enable DMA transfer.
* -2- Prepare acknowledge for Master data reception.
* -3- Initiate a Start condition to the Slave device.
* -4- Loop until Start Bit transmitted (SB flag raised).
* -5- Send Slave address with a 7-Bit SLAVE_OWN_ADDRESS for a write request.
* -6- Loop until Address Acknowledgement received (ADDR flag raised).
* -7- Clear ADDR flag and loop until end of transfer completed (DMA TC raised).
* -8- Loop until end of master transfer completed (TXE flag raised) then generate STOP condition
* -8.1- Data consistency are checking into Slave process.
* @param None
* @retval None
*/
void Handle_I2C_Master(void)
{
/* (1) Enable DMA transfer **************************************************/
LL_DMA_EnableStream(DMA1, LL_DMA_STREAM_1);
/* (2) Prepare acknowledge for Master data reception ************************/
LL_I2C_AcknowledgeNextData(I2C1, LL_I2C_ACK);
/* (3) Initiate a Start condition to the Slave device ***********************/
/* Master Generate Start condition */
LL_I2C_GenerateStartCondition(I2C1);
/* (4) Loop until Start Bit transmitted (SB flag raised) ********************/
#if (USE_TIMEOUT == 1)
Timeout = I2C_SEND_TIMEOUT_SB_MS;
#endif /* USE_TIMEOUT */
/* Loop until SB flag is raised */
while(!LL_I2C_IsActiveFlag_SB(I2C1))
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if(Timeout-- == 0)
{
/* Time-out occurred. Set LED2 to blinking mode */
LED_Blinking(LED_BLINK_SLOW);
}
}
#endif /* USE_TIMEOUT */
}
/* (5) Send Slave address with a 7-Bit SLAVE_OWN_ADDRESS for a write request */
LL_I2C_TransmitData8(I2C1, SLAVE_OWN_ADDRESS | I2C_REQUEST_WRITE);
/* (6) Loop until Address Acknowledgement received (ADDR flag raised) *******/
#if (USE_TIMEOUT == 1)
Timeout = I2C_SEND_TIMEOUT_ADDR_MS;
#endif /* USE_TIMEOUT */
/* Loop until ADDR flag is raised */
while(!LL_I2C_IsActiveFlag_ADDR(I2C1))
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if(Timeout-- == 0)
{
/* Time-out occurred. Set LED2 to blinking mode */
LED_Blinking(LED_BLINK_SLOW);
}
}
#endif /* USE_TIMEOUT */
}
/* (7) Clear ADDR flag and loop until end of transfer completed (DMA TC raised) */
/* Clear ADDR flag value in ISR register */
LL_I2C_ClearFlag_ADDR(I2C1);
#if (USE_TIMEOUT == 1)
Timeout = DMA_SEND_TIMEOUT_TC_MS;
#endif /* USE_TIMEOUT */
/* Loop until DMA transfer complete event */
while(!ubMasterTransferComplete)
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if(Timeout-- == 0)
{
/* Time-out occurred. Set LED2 to blinking mode */
LED_Blinking(LED_BLINK_SLOW);
}
}
#endif /* USE_TIMEOUT */
}
/* (8) Loop until end of master transfer completed (TXE flag raised) then generate STOP condition
* -8.1- Data consistency are checking into Slave process. */
#if (USE_TIMEOUT == 1)
Timeout = I2C_SEND_TIMEOUT_TXE_MS;
#endif /* USE_TIMEOUT */
/* Loop until end of master transfer completed (TXE flag raised) */
while(!LL_I2C_IsActiveFlag_TXE(I2C1))
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if(Timeout-- == 0)
{
/* Time-out occurred. Set LED2 to blinking mode */
LED_Blinking(LED_BLINK_SLOW);
}
}
#endif /* USE_TIMEOUT */
}
/* Generate Stop condition */
LL_I2C_GenerateStopCondition(I2C1);
/* Turn LED2 On:
* - Expected bytes have been sent
* - Master Tx sequence completed successfully
*/
LED_On();
}
#endif /* SLAVE_BOARD */
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
/******************************************************************************/
/* IRQ HANDLER TREATMENT Functions */
/******************************************************************************/
/**
* @brief Function to manage User push-button
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
/* Update User push-button variable : to be checked in waiting loop in main program */
ubButtonPress = 1;
}
#ifdef SLAVE_BOARD
/**
* @brief Function called from DMA1 IRQ Handler
* @note This function is executed when the transfer complete interrupt
* is generated
* @retval None
*/
void DMA1_Transfer_Complete_Callback()
{
/* DMA transfer completed */
ubSlaveTransferComplete = 1;
}
/**
* @brief Function called from DMA1 IRQ Handler
* @note This function is executed when the transfer error interrupt
* is generated during DMA transfer
* @retval None
*/
void DMA1_Transfer_Error_Callback()
{
/* Disable DMA1_Stream5_IRQn */
NVIC_DisableIRQ(DMA1_Stream5_IRQn);
/* Error detected during DMA transfer */
LED_Blinking(LED_BLINK_ERROR);
}
#else /* MASTER_BOARD */
/**
* @brief Function called from DMA1 IRQ Handler
* @note This function is executed when the transfer complete interrupt
* is generated
* @retval None
*/
void DMA1_Transfer_Complete_Callback()
{
/* DMA transfer completed */
ubMasterTransferComplete = 1;
}
/**
* @brief Function called from DMA1 IRQ Handler
* @note This function is executed when the transfer error interrupt
* is generated during DMA transfer
* @retval None
*/
void DMA1_Transfer_Error_Callback()
{
/* Disable DMA1_Stream1_IRQn */
NVIC_DisableIRQ(DMA1_Stream1_IRQn);
/* Error detected during DMA transfer */
LED_Blinking(LED_BLINK_ERROR);
}
#endif /* SLAVE_BOARD */
/**
* @brief Function called in case of error detected in I2C IT Handler
* @param None
* @retval None
*/
void Error_Callback(void)
{
/* Disable DMA1_Stream5_IRQn and DMA1_Stream1_IRQn */
NVIC_DisableIRQ(DMA1_Stream5_IRQn);
NVIC_DisableIRQ(DMA1_Stream1_IRQn);
/* Unexpected event : Set LED2 to Blinking mode to indicate error occurs */
LED_Blinking(LED_BLINK_ERROR);
}
#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", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/