Posted on May 17, 2011 at 12:56Hello,
in the first, sorry for my bad english.
I have make a Board wit h the STM32F103R8 and will use the
PA01 as a Input-Pin (Switch) and use the USART2 as 2-Wire about Handshake.
We use the IAR EWARM 5.2 and hthe STM-Lib 2.0
My SW-Application is running without the usart-function. When i include the usart-function is the PA01 fix on high.
my start-function:
Init the GPIOs with GPIO-Clock (PA01 as IN_FLOATING
Init the USART2 with USART-Clock and the GPIO´s TxD und RxD
void Misc_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// IO-Vorbereitung
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_Init(GPIOD, &GPIO_InitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO, DISABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
...
// DI_TAST1
GPIO_InitStructure.GPIO_Pin = DI_TAST1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(DI_TAST1_PORT, &GPIO_InitStructure);
// DI_TAST2
GPIO_InitStructure.GPIO_Pin = DI_TAST2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(DI_TAST2_PORT, &GPIO_InitStructure);
}
void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
// USART init
// USART Deinit
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
USART_DeInit(USART2);
GPIO_PinRemapConfig(GPIO_Remap_USART2,DISABLE);
// Initialisiere Portpins
// DO_RS232_TXD
#if DO_RS232_TXD_FUNC == ALTERNATE
GPIO_InitStructure.GPIO_Pin = DO_RS232_TXD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init (DO_RS232_TXD_PORT, &GPIO_InitStructure);
#endif
// DI_RS232_RXD
#if DI_RS232_RXD_FUNC == ALTERNATE
GPIO_InitStructure.GPIO_Pin = DI_RS232_RXD;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init (DI_RS232_RXD_PORT, &GPIO_InitStructure);
#endif
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;
// Configure the USART2
USART_Init(USART2, &USART_InitStructure);
// Enable the USART2
USART_Cmd(USART2, ENABLE);
} /* USART_Config */
in Main
// Init clock system
RCC_Configuration();
// NVIC configuration
NVIC_Configuration();
// Config Miscellaneous
Misc_Config();
// Config I2C-Bus
I2C_Config();
// Config USART2
USART_Config();
// External Interrupt Lines
EXTI_Configuration();
// Config AD-Converter
ADC_Config();
When i run the USART-Config goes the PA01 fix to high.
The transmit is ok.
Thanks for the help
best regards
Jörg
