/**
* @brief Start Bit Method to USART AutoBaudRate.
* @param None
* @retval None
*/
static void AutoBauRate_StartBitMethod(void)
{
/* USART enable */
USART_Cmd(USART1, ENABLE);
/* Configure the AutoBaudRate method */
USART_AutoBaudRateConfig(USART1, USART_AutoBaudRate_StartBit);
/* Enable AutoBaudRate feature */
USART_AutoBaudRateCmd(USART1, ENABLE);
/* Wait until Receive enable acknowledge flag is set */
while(USART_GetFlagStatus(USART1, USART_FLAG_REACK) == RESET)
{}
/* Wait until Transmit enable acknowledge flag is set */
while(USART_GetFlagStatus(USART1, USART_FLAG_TEACK) == RESET)
{}
/* Loop until the end of Autobaudrate phase */
while(USART_GetFlagStatus(USART1, USART_FLAG_ABRF) == RESET)
{}
/* If AutoBaudBate error occurred */
if (USART_GetFlagStatus(USART1, USART_FLAG_ABRE) != RESET)
{
/* Turn on LED3 */
STM_EVAL_LEDOn(LED3);
}
else
{
/* Turn on LED2 */
STM_EVAL_LEDOn(LED2);
/* Wait until RXNE flag is set */
while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
{}
/* Wait until TXE flag is set */
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
{}
/* Send received character */
USART_SendData(USART1, USART_ReceiveData(USART1));
/* clear the TE bit (if a transmission is on going or a data is in the TDR, it will be sent before
efectivelly disabling the transmission) */
USART_DirectionModeCmd(USART1, USART_Mode_Tx, DISABLE);
/* Check the Transfer Complete Flag */
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{}
}
/* USART Disable */
USART_Cmd(USART1, DISABLE);
}
/**
* @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_stm32f30x.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f30x.c file
*/
/* Initialize LEDs available on STM32303C-EVAL board ************************/
STM_EVAL_LEDInit(LED1);
STM_EVAL_LEDInit(LED2);
STM_EVAL_LEDInit(LED3);
STM_EVAL_LEDInit(LED4);
/* Enable PWR APB clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* USART configuration to Wake up from STOP mode by Start bit Method */
USART_Config();
/* Waiting Wake Up interrupt */
while(InterruptCounter == 0x00)
{}
/* Disable USART peripheral in STOP mode */
USART_STOPModeCmd(USART1, DISABLE);
while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
{}
DataReceived = USART_ReceiveData(USART1);
/* Clear the TE bit (if a transmission is on going or a data is in the TDR, it will be sent before
effectively disabling the transmission) */
USART_DirectionModeCmd(USART1, USART_Mode_Tx, DISABLE);
/* Check the Transfer Complete Flag */
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{}
/* USART Disable */
USART_Cmd(USART1, DISABLE);
/* Configure SystemClock*/
RestoreConfiguration();
/* Configure and enable the systick timer to generate an interrupt each 1 ms */
SysTick_Config((SystemCoreClock / 1000));
while(1)
{}
}
/**
* @brief Start Bit Method to Wake Up USART from Stop mode Test.
* @param None
* @retval None
*/
static void WakeUp_StartBitMethod(void)
{
/* Configure the wake up Method = Start bit */
USART_StopModeWakeUpSourceConfig(USART1, USART_WakeUpSource_StartBit);
/* Enable USART1 */
USART_Cmd(USART1, ENABLE);
/* Before entering the USART in STOP mode the REACK flag must be checked to ensure the USART RX is ready */
while(USART_GetFlagStatus(USART1, USART_FLAG_REACK) == RESET)
{}
/* Enable USART STOP mode by setting the UESM bit in the CR1 register.*/
USART_STOPModeCmd(USART1, ENABLE);
/* Enable the wake up from stop Interrupt */
USART_ITConfig(USART1, USART_IT_WU, ENABLE);
/* Enable PWR APB clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Enter USART in STOP mode with regulator in low power mode */
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
/* Waiting Wake Up interrupt */
while(InterruptCounter == 0x00)
{}
/* Disable USART peripheral in STOP mode */
USART_STOPModeCmd(USART1, DISABLE);
while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
{}
DataReceived = USART_ReceiveData(USART1);
/* Clear the TE bit (if a transmission is on going or a data is in the TDR, it will be sent before
efectivelly disabling the transmission) */
USART_DirectionModeCmd(USART1, USART_Mode_Tx, DISABLE);
/* Check the Transfer Complete Flag */
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{}
/* USART Disable */
USART_Cmd(USART1, DISABLE);
}
