Start writing USART driver of STM32.
This commit is contained in:
NIIBE Yutaka
123
contrib/usart-stm32.c
Normal file
123
contrib/usart-stm32.c
Normal file
@@ -0,0 +1,123 @@
|
|||||||
|
/*
|
||||||
|
* usart-stm32.c - USART driver for STM32F103 (USART2 and USART3)
|
||||||
|
*
|
||||||
|
* Copyright (C) 2017 g10 Code GmbH
|
||||||
|
* Author: NIIBE Yutaka <gniibe@fsij.org>
|
||||||
|
*
|
||||||
|
* This file is a part of Chopstx, a thread library for embedded.
|
||||||
|
*
|
||||||
|
* Chopstx is free software: you can redistribute it and/or modify it
|
||||||
|
* under the terms of the GNU General Public License as published by
|
||||||
|
* the Free Software Foundation, either version 3 of the License, or
|
||||||
|
* (at your option) any later version.
|
||||||
|
*
|
||||||
|
* Chopstx is distributed in the hope that it will be useful, but
|
||||||
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
* General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
*
|
||||||
|
* As additional permission under GNU GPL version 3 section 7, you may
|
||||||
|
* distribute non-source form of the Program without the copy of the
|
||||||
|
* GNU GPL normally required by section 4, provided you inform the
|
||||||
|
* receipents of GNU GPL by a written offer.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <chopstx.h>
|
||||||
|
#include <mcu/stm32.h>
|
||||||
|
|
||||||
|
struct USART {
|
||||||
|
volatile uint32_t SR;
|
||||||
|
volatile uint32_t DR;
|
||||||
|
volatile uint32_t BRR;
|
||||||
|
volatile uint32_t CR1;
|
||||||
|
volatile uint32_t CR2;
|
||||||
|
volatile uint32_t CR3;
|
||||||
|
volatile uint32_t GTPR;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define USART2_BASE (APB1PERIPH_BASE + 0x4400)
|
||||||
|
#define USART3_BASE (APB1PERIPH_BASE + 0x4800)
|
||||||
|
static struct USART *const USART2 = (struct SYSCFG *)USART2_BASE;
|
||||||
|
static struct USART *const USART3 = (struct SYSCFG *)USART3_BASE;
|
||||||
|
|
||||||
|
#define USART_SR_CTS 0x0200
|
||||||
|
#define USART_SR_LBD 0x0100
|
||||||
|
#define USART_SR_TXE 0x0080
|
||||||
|
#define USART_SR_TC 0x0040
|
||||||
|
#define USART_SR_RXNE 0x0020
|
||||||
|
#define USART_SR_IDLE 0x0010
|
||||||
|
#define USART_SR_ORE 0x0008
|
||||||
|
#define USART_SR_NE 0x0004
|
||||||
|
#define USART_SR_FE 0x0002
|
||||||
|
#define USART_SR_PE 0x0001
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
static struct USART *
|
||||||
|
get_usart_dev (uint8_t dev_no)
|
||||||
|
{
|
||||||
|
if (dev_no == 2)
|
||||||
|
return USART2;
|
||||||
|
else if (dev_no == 3)
|
||||||
|
return USART3;
|
||||||
|
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* We assume 36MHz f_PCLK */
|
||||||
|
struct brr_setting { uint8_t baud_spec, uint16_t brr_value };
|
||||||
|
#define NUM_BAUD (sizeof (brr_table) / sizeof (struct brr_setting))
|
||||||
|
|
||||||
|
static const struct brr_setting brr_table[] = {
|
||||||
|
{ B600, (3750 << 4)},
|
||||||
|
{ B1200, (1875 << 4)},
|
||||||
|
{ B2400, ( 937 << 4)|8},
|
||||||
|
{ B9600, ( 234 << 4)|6},
|
||||||
|
{ B19200, ( 117 << 4)|3},
|
||||||
|
{ B57600, ( 39 << 4)|1},
|
||||||
|
{ B115200, ( 19 << 4)|8},
|
||||||
|
{ B230400, ( 9 << 4)|12},
|
||||||
|
{ B460800, ( 4 << 4)|14},
|
||||||
|
{ B921600, ( 2 << 4)|7},
|
||||||
|
};
|
||||||
|
|
||||||
|
void
|
||||||
|
usart_init (void)
|
||||||
|
{
|
||||||
|
RCC->APB1ENR |= ((1 << 18) | (1 << 17));
|
||||||
|
RCC->APB1RSTR = ((1 << 18) | (1 << 17));
|
||||||
|
RCC->APB1RSTR = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* CONFIG_BITS includes
|
||||||
|
* baud_rate
|
||||||
|
* char-bit size
|
||||||
|
* stop-bit
|
||||||
|
* parity
|
||||||
|
* mode: Normal, LIN, Smartcard, etc.
|
||||||
|
* flow_ctrl
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
usart_config (uint8_t dev_no, uint32_t config_bits)
|
||||||
|
{
|
||||||
|
struct USART *dev = get_usart_dev (dev_no);
|
||||||
|
uint8_t baud_spec = (config & 0x3f);
|
||||||
|
int i;
|
||||||
|
|
||||||
|
for (i = 0; i < NUM_BAUD; i++)
|
||||||
|
if (brr_table[i].baud_spec == baud_spec)
|
||||||
|
break;
|
||||||
|
|
||||||
|
if (i >= NUM_BAUD)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
dev->BRR = brr_table[i].brr_value;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
@@ -1,33 +0,0 @@
|
|||||||
/*
|
|
||||||
* usart-stm32f103.c - USART driver for STM32F103
|
|
||||||
*
|
|
||||||
* Copyright (C) 2017 g10 Code GmbH
|
|
||||||
* Author: NIIBE Yutaka <gniibe@fsij.org>
|
|
||||||
*
|
|
||||||
* This file is a part of Chopstx, a thread library for embedded.
|
|
||||||
*
|
|
||||||
* Chopstx is free software: you can redistribute it and/or modify it
|
|
||||||
* under the terms of the GNU General Public License as published by
|
|
||||||
* the Free Software Foundation, either version 3 of the License, or
|
|
||||||
* (at your option) any later version.
|
|
||||||
*
|
|
||||||
* Chopstx is distributed in the hope that it will be useful, but
|
|
||||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
||||||
* General Public License for more details.
|
|
||||||
*
|
|
||||||
* You should have received a copy of the GNU General Public License
|
|
||||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
||||||
*
|
|
||||||
* As additional permission under GNU GPL version 3 section 7, you may
|
|
||||||
* distribute non-source form of the Program without the copy of the
|
|
||||||
* GNU GPL normally required by section 4, provided you inform the
|
|
||||||
* receipents of GNU GPL by a written offer.
|
|
||||||
*
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include <stdint.h>
|
|
||||||
#include <stdlib.h>
|
|
||||||
#include <chopstx.h>
|
|
||||||
#include <mcu/stm32.h>
|
|
||||||
#include <mcu/stm32f103.h>
|
|
||||||
39
contrib/usart.h
Normal file
39
contrib/usart.h
Normal file
@@ -0,0 +1,39 @@
|
|||||||
|
#define B0 0 /* POSIX to hang up */
|
||||||
|
|
||||||
|
/* POSIX supports B75 to B300 */
|
||||||
|
#define B600 16
|
||||||
|
#define B1200 17
|
||||||
|
#define B2400 19
|
||||||
|
#define B9600 21
|
||||||
|
#define B19200 22
|
||||||
|
#define B57600 24
|
||||||
|
#define B115200 25
|
||||||
|
#define B230400 26
|
||||||
|
#define B460800 27
|
||||||
|
#define B921600 28
|
||||||
|
|
||||||
|
/* POSIX supports 5, 6. USB suppots 16 */
|
||||||
|
#define CS7 (2 << 6)
|
||||||
|
#define CS8 (3 << 6)
|
||||||
|
|
||||||
|
#define STOP0B5 (0 << 9) /* Driver only */
|
||||||
|
#define STOP1B (1 << 9) /* USB, POSIX */
|
||||||
|
#define STOP1B5 (2 << 9) /* USB */
|
||||||
|
#define STOP2B (3 << 9) /* USB, POSIX */
|
||||||
|
|
||||||
|
#define PARENB (1 << 11)
|
||||||
|
#define PARODD (2 << 11)
|
||||||
|
/* USB 0: none, 1: odd, 2: even, 3: mark, 4: space */
|
||||||
|
|
||||||
|
#define CRTSCTS (1 << 14)
|
||||||
|
|
||||||
|
/*
|
||||||
|
BAUD_BITS 6
|
||||||
|
CS_BITS 3
|
||||||
|
STOP_BITS 2
|
||||||
|
PAR_BITS 3
|
||||||
|
*/
|
||||||
|
/* USB: SET_CONTROL_LINE_STATE
|
||||||
|
DTR RTS */
|
||||||
|
/* USB: SERIAL_STATE
|
||||||
|
DSR DCD RI */
|
||||||
Reference in New Issue
Block a user