102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/*
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* usart-gd32vf103.c - USART driver for GD32VF103 (USART0)
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*
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* Copyright (C) 2017, 2019 g10 Code GmbH
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* Author: NIIBE Yutaka <gniibe@fsij.org>
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*
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* This file is a part of Chopstx, a thread library for embedded.
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*
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* Chopstx is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Chopstx is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* As additional permission under GNU GPL version 3 section 7, you may
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* distribute non-source form of the Program without the copy of the
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* GNU GPL normally required by section 4, provided you inform the
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* recipients of GNU GPL by a written offer.
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <chopstx.h>
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#include <mcu/stm32.h>
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#include <contrib/usart.h>
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#include <contrib/usart-impl.h>
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#include <contrib/usart-impl-f103.h>
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#define USART0_BASE (APB2PERIPH_BASE + 0x3800)
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#define USART0 ((struct USART *)USART0_BASE)
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static struct usart_stat usart0_stat;
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static struct chx_intr usart0_intr;
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#define BUF_A2H_SIZE 256
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#define BUF_H2A_SIZE 512
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static uint8_t buf_usart0_rb_a2h[BUF_A2H_SIZE];
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static uint8_t buf_usart0_rb_h2a[BUF_H2A_SIZE];
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static struct rb usart0_rb_a2h;
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static struct rb usart0_rb_h2a;
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static chopstx_poll_cond_t usart0_app_write_event;
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/* Global variables so that it can be easier to debug. */
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static int usart0_tx_ready;
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#define INTR_REQ_USART0 56
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#define USART_DEVNO_START 0
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#define USART_DEVNO_END 0
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static const struct usart usart_array[] =
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{
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{ USART0, &usart0_intr, INTR_REQ_USART0,
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&usart0_stat, &usart0_rb_a2h, &usart0_rb_h2a, buf_usart0_rb_a2h,
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buf_usart0_rb_h2a, &usart0_app_write_event, &usart0_tx_ready },
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};
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/* It's 96MHz f_PCLK */
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static const struct brr_setting brr_table[] = {
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/* Can't be represented in 16-bit { B600, (10000 << 4)}, */
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/* Can't be represented in 16-bit { B1200, (5000 << 4)}, */
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{ B2400, ( 2500 << 4)|0},
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{ B9600, ( 625 << 4)|0},
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{ B19200, ( 312 << 4)|8},
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{ B57600, ( 104 << 4)|3},
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{ B115200, ( 52 << 4)|1},
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{ B230400, ( 26 << 4)|0},
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{ B460800, ( 13 << 4)|0},
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{ B921600, ( 6 << 4)|8},
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{ BSCARD1, ( 620 << 4)|0}, /* 9677 */
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{ BSCARD2, ( 310 << 4)|0}, /* 19354 */
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{ BSCARD4, ( 155 << 4)|0}, /* 38709 */
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{ BSCARD8, ( 77 << 4)|8}, /* 77419 */
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{ BSCARD12, ( 51 << 4)|11}, /* 116129 */
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{ BSCARD16, ( 38 << 4)|13}, /* 154506 */
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{ BSCARD20, ( 31 << 4)|0}, /* 193548 */
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};
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#include "usart-common.c"
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static void
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usart_rcc_setup (void)
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{
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/* Enable USART0 clock, and strobe reset. */
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RCC->APB2ENR |= (1 << 14);
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RCC->APB2RSTR = (1 << 14);
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RCC->APB2RSTR = 0;
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}
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#include "usart-common-f103.c"
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