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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* Copyright (c) 2020, Shenzhen Academy of Aerospace Technology
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-10-16 Dystopia the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#include <interrupt.h>
#include "uart.h"
#include "uart_reg.h"
struct bm3803_uart
{
void *uart_base;
int irq;
};
static void bm3803_uart_isr(int tt, void *param)
{
struct bm3803_uart *uart;
struct rt_serial_device *serial;
struct uart_reg *uart_base;
serial = (struct rt_serial_device *)param;
uart = (struct bm3803_uart *)serial->parent.user_data;
uart_base = uart->uart_base;
if (uart_base->uartstatus & 0x1)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
}
#define NOT_IMPLEMENTED() RT_ASSERT(0)
static rt_err_t bm3803_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct bm3803_uart *uart;
struct uart_reg *uart_base;
RT_ASSERT(serial != RT_NULL);
uart = (struct bm3803_uart *)serial->parent.user_data;
RT_ASSERT(uart);
uart_base = uart->uart_base;
if (cfg->baud_rate == BAUD_RATE_115200)
{
uart_base->uartscaler = ((((CPU_FREQ * 10) / (8 * 115200)) - 5) / 10);
}
else if (cfg->baud_rate == BAUD_RATE_9600)
{
uart_base->uartscaler = ((((CPU_FREQ * 10) / (8 * 9600)) - 5) / 10);
}
else
{
NOT_IMPLEMENTED();
}
uart_base->uartctrl |= 0x3;
return RT_EOK;
}
static rt_err_t bm3803_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct bm3803_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct bm3803_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
rt_hw_interrupt_mask(uart->irq);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
rt_hw_interrupt_umask(uart->irq);
break;
}
return RT_EOK;
}
static int bm3803_putc(struct rt_serial_device *serial, char c)
{
struct bm3803_uart *uart;
struct uart_reg *uart_base;
RT_ASSERT(serial != RT_NULL);
uart = (struct bm3803_uart *)serial->parent.user_data;
uart_base = uart->uart_base;
while (!(uart_base->uartstatus & 0x4));
uart_base->uartdata = c;
return 1;
}
static int bm3803_getc(struct rt_serial_device *serial)
{
int ch;
struct bm3803_uart *uart;
struct uart_reg *uart_base;
RT_ASSERT(serial != RT_NULL);
uart = (struct bm3803_uart *)serial->parent.user_data;
uart_base = uart->uart_base;
ch = -1;
if (uart_base->uartstatus & 0x1)
{
ch = uart_base->uartdata;
}
return ch;
}
static const struct rt_uart_ops bm3803_uart_ops =
{
bm3803_configure,
bm3803_control,
bm3803_putc,
bm3803_getc,
};
/* UART device driver structure */
#ifdef RT_USING_UART1
struct bm3803_uart uart1 =
{
(void *)UART1_BASE,
UART1_TT,
};
struct rt_serial_device serial1;
#endif
int rt_hw_serial_init(void)
{
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef RT_USING_UART1
volatile struct lregs *regs = (struct lregs *)PREGS;
serial1.ops = &bm3803_uart_ops;
serial1.config = config;
/* configure gpio direction */
regs->piodir |= (1 << 15);
regs->piodir &= ~(1 << 14);
/* enable RX interrupt */
regs->uartctrl1 = 0;
regs->uartctrl1 |= 0x4;
/* install ISR */
rt_hw_interrupt_install(uart1.irq, bm3803_uart_isr, &serial1, "uart1");
rt_hw_interrupt_mask(uart1.irq);
/* register UART1 device */
rt_hw_serial_register(&serial1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
&uart1);
#endif
return 0;
}
INIT_BOARD_EXPORT(rt_hw_serial_init);
|
