101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
/*!
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\file main.c
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\brief USART printf
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\version 2021-10-30, V1.0.0, firmware for GD32W51x
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*/
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/*
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Copyright (c) 2021, GigaDevice Semiconductor Inc.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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#include "gd32w51x.h"
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#include <stdio.h>
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void com_usart_init(void);
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/*!
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\brief main function
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\param[in] none
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\param[out] none
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\retval none
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*/
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int main(void)
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{
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/* initialize the COM */
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com_usart_init();
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printf("usart transmit test example!");
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while(1){
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}
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}
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/*!
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\brief initialize the USART configuration of the COM
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\param[in] none
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\param[out] none
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\retval none
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*/
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void com_usart_init(void)
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{
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/* enable COM GPIO clock */
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rcu_periph_clock_enable(RCU_GPIOB);
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/* enable USART clock */
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rcu_periph_clock_enable(RCU_USART2);
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/* connect port to USART TX */
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gpio_af_set(GPIOB, GPIO_AF_7, GPIO_PIN_10);
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/* connect port to USART RX */
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gpio_af_set(GPIOB, GPIO_AF_7, GPIO_PIN_11);
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/* configure USART Tx as alternate function push-pull */
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gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
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gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, GPIO_PIN_10);
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/* configure USART Rx as alternate function push-pull */
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gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_11);
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gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, GPIO_PIN_11);
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/* USART configuration */
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usart_deinit(USART2);
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usart_word_length_set(USART2, USART_WL_8BIT);
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usart_stop_bit_set(USART2, USART_STB_1BIT);
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usart_parity_config(USART2, USART_PM_NONE);
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usart_baudrate_set(USART2, 115200U);
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usart_receive_config(USART2, USART_RECEIVE_ENABLE);
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usart_transmit_config(USART2, USART_TRANSMIT_ENABLE);
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usart_enable(USART2);
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}
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/* retarget the C library printf function to the USART */
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int fputc(int ch, FILE *f)
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{
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usart_data_transmit(USART2, (uint8_t) ch);
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while(RESET == usart_flag_get(USART2, USART_FLAG_TBE));
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return ch;
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}
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