Posted on November 18, 2014 at 14:33I have STM32RBT6. After initialisation of USART1, the RTS remains high. The code is as follows:
/** USART1 GPIO Configuration
PA9 ------> USART1_TX
PA10 ------> USART1_RX
PA11 ------> USART1_CTS
PA12 ------> USART1_RTS
*/
GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef usartinit;
NVIC_InitTypeDef NVIC_InitStructure;
/* System Clocks Configuration */
/* USART1 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* GPIOA clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/*Enable APB2 peripheral clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Configure USART1 RTS and USART1 Tx as alternate function push-pull */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_12;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// Override RTS ToDo: check for bug in RTS handling !!!!!!!!!!!!!!!!!!!!!!!!!
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_ResetBits(GPIOA, GPIO_Pin_12);
/* Configure USART1 CTS and USART1 Rx as input floating */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_10;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStruct);
/* Configure USART1, 115200 baud, harware flow control, 1 stop bit, no parity */
usartinit.USART_BaudRate = 115200;
usartinit.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS_CTS;
usartinit.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
usartinit.USART_Parity = USART_Parity_No;
usartinit.USART_StopBits = USART_StopBits_1;
usartinit.USART_WordLength = USART_WordLength_8b;
USART_Init(USART1, &usartinit);
USART_Cmd(USART1, ENABLE);
/* Enable USART1 IRQ */
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // enable IRQ on RX
NVIC_EnableIRQ(USART1_IRQn); // Enable IRQ for USART1 in NVIC
I am using STM32F10x Standard Peripherals Library 3.5.1
What am I missing?
Regards,
Marko
#stm32-usart-rts-remains-high
