Question
STM32F072 PWR_EnterSTOPMode USART problem
Posted on October 02, 2014 at 16:28
Hi, I have a major problem about mySTM32F I'm trying to join usage ofPWR_EnterSTOPMode with USART. I use USART1 and 3 from my microcontroller, it initialiaze properly and I'm able to communicate through it. Mentioned issue appears after usingPWR_EnterSTOPMode function, USART communication still works but it isn't synchronized, so I get a bunch of incorrect characters on the output. I suposse that there is some kind of mess with system clocks after usage of sleep mode.
I will be very grateful for any help.
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
///////////////////////////////////////////____PIN_CFG____///////////////////////////////////////////
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER8 )) | (GPIO_MODER_MODER8_0 );
//GPIOB->PUPDR |= ~(GPIO_PUPDR_PUPDR3_1);
//GPIOA->PUPDR = (GPIOA->PUPDR & ~(GPIO_PUPDR_PUPDR8_1));
// Port C
RCC->AHBENR |= RCC_AHBENR_GPIOCEN;
GPIOC->MODER = (GPIOC->MODER & ~(GPIO_MODER_MODER9 | GPIO_MODER_MODER7| GPIO_MODER_MODER6)) \
| (GPIO_MODER_MODER9_0 | GPIO_MODER_MODER7_0| GPIO_MODER_MODER6_0);
GPIOC->PUPDR = (GPIOC->PUPDR & ~(GPIO_PUPDR_PUPDR9_1 | GPIO_PUPDR_PUPDR7_1| GPIO_PUPDR_PUPDR6_1));
// Port B
RCC->AHBENR |= RCC_AHBENR_GPIOBEN;
GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER0 |GPIO_MODER_MODER1 | GPIO_MODER_MODER2 | GPIO_MODER_MODER3 )) \
| (GPIO_MODER_MODER0_0 | GPIO_MODER_MODER1_0 | GPIO_MODER_MODER2_0 | GPIO_MODER_MODER3_0);
//GPIOB->PUPDR |= ~(GPIO_PUPDR_PUPDR3_1);
GPIOB->PUPDR = (GPIOB->PUPDR & ~(GPIO_PUPDR_PUPDR0_1 | GPIO_PUPDR_PUPDR1_1 | GPIO_PUPDR_PUPDR2_1 | GPIO_PUPDR_PUPDR3_1));
///////////////////////////////////////____END_OF_PIN_CFG____///////////////////////////////////////
///////////////////////////////////////////____USART_1____///////////////////////////////////////////
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
// Configure USART1 pins: Rx and Tx ----------------------------
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Enable USART1 IRQ
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1,ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // Enable always
///////////////////////////////////////____END_OF_USART_1____///////////////////////////////////////
///////////////////////////////////////////____USART_3____///////////////////////////////////////////
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_4);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_4);
// Configure USART3 pins: and Tx ---------------------------
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Enable USART3 IRQ
NVIC_InitStructure.NVIC_IRQChannel = USART3_4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART3, &USART_InitStructure);
USART_Cmd(USART3,ENABLE);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); // Enable always
// USART3->CR1 |= USART_CR1_TCIE; enable TC interrupt
// NVIC_SetPriority(USART3_4_IRQn, 0); // (3)
// NVIC_EnableIRQ(USART3_4_IRQn); // (4) /
///////////////////////////////////////____END_OF_USART_3____///////////////////////////////////////
Configure_GPIO_LED();
GPIO_SetBits(GPIOB, GPIO_Pin_1);
/* Enable PWR APB1 Clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to Backup */
PWR_BackupAccessCmd(ENABLE);
/* Reset RTC Domain */
RCC_BackupResetCmd(ENABLE);
RCC_BackupResetCmd(DISABLE);
RTCInit();
RTC_SetWakeUpCounter(0x3000-1);
/* Enable the Wakeup Interrupt */
RTC_ITConfig(RTC_IT_WUT, ENABLE);
RTC_WakeUpCmd(ENABLE);
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
RTC_WakeUpCmd(DISABLE);