//****************************************************************************
#define USART_VCP USART2
#ifdef USART_CR1_TXEIE_TXFNFIE // FIFO Support
#define USART_CR1_RXNEIE USART_CR1_RXNEIE_RXFNEIE
#define USART_CR1_TXEIE USART_CR1_TXEIE_TXFNFIE
#define USART_ISR_RXNE USART_ISR_RXNE_RXFNE
#define USART_ISR_TXE USART_ISR_TXE_TXFNF
#endif // Copyright (C) 2018 sourcer32@gmail.com
//****************************************************************************
void OutChar(char c)
{
while((USART_VCP->ISR & USART_ISR_TXE) == 0); // Wait for Empty
USART_VCP->TDR = c; // Send Char
}
//****************************************************************************
void OutString(char *s)
{
while(*s)
{
while((USART_VCP->ISR & USART_ISR_TXE) == 0); // Wait for Empty
USART_VCP->TDR = *s++; // Send Char
}
}
//****************************************************************************
void USART2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = { 0 };
__USART2_CLK_ENABLE();
__GPIOA_CLK_ENABLE();
/* UART RX/TX GPIO pin configuration */
GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/*## Configure the UART peripheral ######################################*/
/* Put the USART peripheral in the Asynchronous mode (UART Mode) */
/* UART1 configured as follow:
- Word Length = 8 Bits
- Stop Bit = One Stop bit
- Parity = NO parity
- BaudRate = 115200 baud
- Hardware flow control disabled (RTS and CTS signals) */
UartHandle.Instance = USART2;
UartHandle.Init.BaudRate = 115200;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
#ifdef UART_ONE_BIT_SAMPLE_DISABLE
UartHandle.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
#endif
if (HAL_UART_Init(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
// HAL_NVIC_SetPriority(USART2_IRQn, 1, 0);
// HAL_NVIC_EnableIRQ(USART2_IRQn);
}
//******************************************************************************
int main(void)
{
/* STM32L4xx HAL library initialization:
- Configure the Flash prefetch, Flash preread and Buffer caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Low Level Initialization
*/
HAL_Init();
/* Configure the System clock to have a frequency of 80 MHz */
SystemClock_Config();
USART2_Init();
OutString("Nucleo L476RG\r\n");
/* Infinite loop */
while (1)
{
}
}
//****************************************************************************
