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/*
* stm-uart.c
* ----------
* Functions for sending strings and numbers over the uart.
*
* Copyright (c) 2015, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "stm32f4xx_hal.h"
#include "stm-uart.h"
#include <string.h>
/* initialized in MX_USART2_UART_Init() in stm-init.c */
UART_HandleTypeDef huart2;
/* send a single character */
HAL_StatusTypeDef uart_send_char(uint8_t ch)
{
return HAL_UART_Transmit(&huart2, &ch, 1, 0x1);
}
/* receive a single character */
HAL_StatusTypeDef uart_recv_char(uint8_t *cp)
{
return HAL_UART_Receive(&huart2, cp, 1, 0x0);
}
/* send a string */
HAL_StatusTypeDef uart_send_string(char *s)
{
return HAL_UART_Transmit(&huart2, (uint8_t *) s, strlen(s), 0x1);
}
/* Generalized routine to send binary, decimal, and hex integers.
* This code is adapted from Chris Giese's printf.c
*/
HAL_StatusTypeDef uart_send_number(uint32_t num, uint8_t digits, uint8_t radix)
{
#define BUFSIZE 32
char buf[BUFSIZE];
char *where = buf + BUFSIZE;
/* initialize buf so we can add leading 0 by adjusting the pointer */
memset(buf, '0', BUFSIZE);
/* build the string backwards, starting with the least significant digit */
do {
uint32_t temp;
temp = num % radix;
where--;
if (temp < 10)
*where = temp + '0';
else
*where = temp - 10 + 'A';
num = num / radix;
} while (num != 0);
if (where > buf + BUFSIZE - digits)
/* pad with leading 0 */
where = buf + BUFSIZE - digits;
else
/* number is larger than the specified number of digits */
digits = buf + BUFSIZE - where;
return HAL_UART_Transmit(&huart2, (uint8_t *) where, digits, 0x1);
}
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