1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
* Copyright (c) 2011, 2012 LeafLabs, LLC.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
/**
* @file wirish/HardwareSerial.cpp
* @brief Wirish serial port implementation.
*/
#include <wirish/HardwareSerial.h>
#include <libmaple/libmaple.h>
#include <libmaple/gpio.h>
#include <libmaple/timer.h>
#include <libmaple/usart.h>
#define DEFINE_HWSERIAL(name, n) \
HardwareSerial name(USART##n, \
BOARD_USART##n##_TX_PIN, \
BOARD_USART##n##_RX_PIN)
#if BOARD_HAVE_USART1
DEFINE_HWSERIAL(Serial1, 1);
#endif
#if BOARD_HAVE_USART2
DEFINE_HWSERIAL(Serial2, 2);
#endif
#if BOARD_HAVE_USART3
DEFINE_HWSERIAL(Serial3, 3);
#endif
#if BOARD_HAVE_UART4
DEFINE_HWSERIAL(Serial4, 4);
#endif
#if BOARD_HAVE_UART5
DEFINE_HWSERIAL(Serial5, 5);
#endif
#if BOARD_HAVE_USART6
DEFINE_HWSERIAL(Serial6, 6);
#endif
HardwareSerial::HardwareSerial(usart_dev *usart_device,
uint8 tx_pin,
uint8 rx_pin) {
this->usart_device = usart_device;
this->tx_pin = tx_pin;
this->rx_pin = rx_pin;
}
/*
* Set up/tear down
*/
#if STM32_MCU_SERIES == STM32_SERIES_F1
/* F1 MCUs have no GPIO_AFR[HL], so turn off PWM if there's a conflict
* on this GPIO bit. */
static void disable_timer_if_necessary(timer_dev *dev, uint8 ch) {
if (dev != NULL) {
timer_set_mode(dev, ch, TIMER_DISABLED);
}
}
#elif (STM32_MCU_SERIES == STM32_SERIES_F2) || \
(STM32_MCU_SERIES == STM32_SERIES_F4)
#define disable_timer_if_necessary(dev, ch) ((void)0)
#else
#warning "Unsupported STM32 series; timer conflicts are possible"
#endif
void HardwareSerial::begin(uint32 baud) {
ASSERT(baud <= this->usart_device->max_baud);
if (baud > this->usart_device->max_baud) {
return;
}
const stm32_pin_info *txi = &PIN_MAP[this->tx_pin];
const stm32_pin_info *rxi = &PIN_MAP[this->rx_pin];
disable_timer_if_necessary(txi->timer_device, txi->timer_channel);
usart_config_gpios_async(this->usart_device,
rxi->gpio_device, rxi->gpio_bit,
txi->gpio_device, txi->gpio_bit,
0);
usart_init(this->usart_device);
usart_set_baud_rate(this->usart_device, USART_USE_PCLK, baud);
usart_enable(this->usart_device);
}
void HardwareSerial::end(void) {
usart_disable(this->usart_device);
}
/*
* I/O
*/
uint8 HardwareSerial::read(void) {
// Block until a byte becomes available, to save user confusion.
while (!this->available())
;
return usart_getc(this->usart_device);
}
uint32 HardwareSerial::available(void) {
return usart_data_available(this->usart_device);
}
void HardwareSerial::write(unsigned char ch) {
usart_putc(this->usart_device, ch);
}
void HardwareSerial::flush(void) {
usart_reset_rx(this->usart_device);
}
|
