Posted on February 20, 2013 at 11:31
hello
I want to use synchronous mode Usart
But I'm totally confused
When I activate the clock
I can not determine if Master or Slave?
Please help Me
USART_InitTypeDef USART_InitStruct;
GPIO_InitTypeDef GPIO_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
//-----------------------------------------------------------------------
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA ,ENABLE);
RCC_APB1PeriphClockCmd( RCC_APB1Periph_USART2 , ENABLE );
//---------Configure USART1 Tx (PA.09) as alternate function push-pull
// GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_KeyBoard_TXD ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIO_KeyBoard, &GPIO_InitStructure);
//------------------------------------------------------------------------
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_KeyBoard_SCK ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIO_KeyBoard, &GPIO_InitStructure);
//------------------------------------------------------------------------
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_KeyBoard_RXD;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIO_KeyBoard, &GPIO_InitStructure);
// ----------------------------------------------------------------------
/* USART_InitStruct members default value */
USART_InitStruct.USART_BaudRate = 9600;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity =USART_Parity_No ;//USART_Parity_No;// USART_Parity_Odd ;
USART_InitStruct.USART_Mode = USART_Mode_Tx ;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_ClockStructInit(&USART_ClockInitStructure);
//-------------------------------------------------------------------------
USART_ClockInitStructure.USART_Clock = USART_Clock_Enable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
//-------------------------------------------------------------------------
USART_ClockInit(USART2, &USART_ClockInitStructure);
USART_Init(USART2, &USART_InitStruct);/* Configure the USART2 */
USART_Cmd(USART2,ENABLE); /* Enable the USART2 */
USART_ITConfig(USART2, USART_IT_RXNE , ENABLE);/* Enable USART2 interrupt */
NVIC_Configuration_Usart2();
