Posted on May 06, 2016 at 03:59thanks clive1,
you've seen that it returns a uint16_t...however, I changed that from a uint8_t as I thought that might have been the problem. It made no difference. not sure if that is what you meant?
there is no other code from what I've posted, other than initialization.
let me ask this - when running in polling mode, as this does, should this:
while ( !(USART2->SR & USART_FLAG_RXNE) );
exit on any 8-bit ascii character? In case you're wondering, I've out the initialization below....thanks
void UART2_Config(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef USART_InitStruct;
NVIC_InitTypeDef NVIC_InitStructure;
//enable USART peripheral clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
//enable peripheral A clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStruct.GPIO_Pin = UART2_TX | UART2_RX;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//set to alternate function 1 for UART operation
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
//set UART specific configuration properties
USART_InitStruct.USART_BaudRate = UART_BAUD_RATE;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART2, &USART_InitStruct);
//enable the UART
USART_Cmd(USART2, ENABLE);
}
