ST STM32F2 User Manual

UM1940
Overview of HAL drivers
DocID028236 Rev 2
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An example of use is illustrated below:
main.c file:
UART_HandleTypeDef UartHandle;
int main(void)
{
/* Set User Parameters */
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength = UART_DATABITS_8;
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.Instance = USART1;
HAL_UART_Init(&UartHandle);
HAL_UART_SendIT(&UartHandle, TxBuffer, sizeof(TxBuffer));
while (1);
}
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
}
void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)
{
}
stm32f2xx_it.cfile:
extern UART_HandleTypeDef UartHandle;
void USART1_IRQHandler(void)
{
HAL_UART_IRQHandler(&UartHandle);
}
2.12.3.3 DMA mode
In DMA mode, the HAL function returns the process status after starting the data
processing through the DMA and after enabling the appropriate DMA interruption. The end
of the operation is indicated by a callback declared as a weak function and can be
customized by the user to be informed in real-time about the process completion. The user
can also get the process status through the HAL_PPP_GetState() function. For the DMA
mode, three functions are declared in the driver:
HAL_PPP_Process_DMA(): launch the process
HAL_PPP_DMA_IRQHandler(): the DMA interruption used by the PPP peripheral
__weak HAL_PPP_ProcessCpltCallback(): the callback relative to the process
completion.
__weak HAL_PPP_ErrorCpltCallback(): the callback relative to the process Error.
To use a process in DMA mode, HAL_PPP_Process_DMA() is called in the user file and
the HAL_PPP_DMA_IRQHandler() is placed in the stm32f2xx_it.c. When DMA mode is
used, the DMA initialization is done in the HAL_PPP_MspInit() callback. The user should
also associate the DMA handle to the PPP handle. For this purpose, the handles of all the
peripheral drivers that use the DMA must be declared as follows:
typedef struct
{
PPP_TypeDef *Instance; /* Register base address */
PPP_InitTypeDef Init; /* PPP communication parameters */
HAL_StateTypeDef State; /* PPP communication state */
(…)
DMA_HandleTypeDef *hdma; /* associated DMA handle */
} PPP_HandleTypeDef;

ST STM32F2 Specifications

General

Brand	ST
Model	STM32F2
Category	Microcontrollers
Language	English