FreeRTOS/Demo/CORTEX_STM32F103_GCC_Rowley/Drivers/STM32_USART.h

/*
 * FreeRTOS Kernel V10.2.0
 * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
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#ifndef STM_32_SERIAL_COMMS_H
#define STM_32_SERIAL_COMMS_H

/*
 * Initialise a COM port.  As supplied 2 COM ports are supported, so ulPort can
 * be either 0 or 1.  Note that COM 0 is in effect USART1 in ST library 
 * terminology.  The baud rate can be any standard baud rate and has been tested
 * up to 115200 baud.
 */
long lCOMPortInit( unsigned long ulPort, unsigned long ulWantedBaud );

/*
 * Output a single char to a COM port.  As supplied 2 COM ports are supported,
 * so ulPort can be 0 or 1.  Note that COM 0 is in effect USART1 in ST library
 * terminology.  cOutChar is the character to be transmit, and xBlockTime is
 * the time the task should be held in the Blocked state (in ticks) for space 
 * to become available in the queue of characters waiting transmission.  pdPASS 
 * will be returned if the character is successfully queued (possible after 
 * waiting in the Blocked state for up to xBlockTime ticks), otherwise pdFAIL 
 * will be returned.
 */
signed long xSerialPutChar( long lPort, signed char cOutChar, TickType_t xBlockTime );

/*
 * Retrieve a character from the queue of received characters.  As supplied 2 
 * COM ports are supported, so ulPort can be 0 or 1.  Note that COM 0 is in 
 * effect USART1 in ST library terminology.  pcRxedChar is the address into
 * which the received character will be copied, and xBlockTime is the time the 
 * task should be held in the Blocked state (in ticks) for a character to be
 * available if one is not available immediately.  pdPASS will be returned if a
 * character is successfully returned (possible after waiting in the Blocked 
 * state for up to xBlockTime ticks), otherwise pdFAIL will be returned.
 */
signed long xSerialGetChar( long lPort, signed char *pcRxedChar, TickType_t xBlockTime );

/*
 * Send a string of characters to a COM port.  As supplied 2 COM ports are 
 * supported, so ulPort can be 0 or 1.  Note that COM 0 is in effect USART1 in 
 * ST library terminology.  pcString contains the address of the first 
 * character to be transmit, and ulStringLength the total number of characters
 * from and including *pcString.  pdPASS will be returned if the entire string
 * is queued for transmission successfully, otherwise pdFAIL will be returned.
 * Note that serPUT_STRING_CHAR_DELAY within STM32_USART.c can be adjusted in
 * accordance with the applications requirements.  Comments are included where
 * serPUT_STRING_CHAR_DELAY is defined.
 */
long lSerialPutString( long lPort, const char * const pcString, unsigned long ulStringLength );

#endif