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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Copyright (c) 2006-2024, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024-08-25 RT-Thread First version for MCXC444
* 2024-09-03 yandld Updated to support multiple UARTs
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "drv_uart.h"
#include "fsl_lpuart.h"
#include "fsl_port.h"
#include "fsl_clock.h"
#ifdef RT_USING_SERIAL
struct mcxc444_uart
{
LPUART_Type *uart_base;
IRQn_Type irqn;
struct rt_serial_device *serial;
char *device_name;
};
static void uart_isr(struct rt_serial_device *serial);
#define UART_DEVICE(uart_base, irq_name, device_name) \
{ \
uart_base, \
irq_name, \
RT_NULL, \
device_name, \
}
static const struct mcxc444_uart uarts[] = {
#ifdef BSP_USING_UART0
UART_DEVICE(LPUART0, LPUART0_IRQn, "uart0"),
#endif
#ifdef BSP_USING_UART1
UART_DEVICE(LPUART1, LPUART1_IRQn, "uart1"),
#endif
};
#define UART_COUNT (sizeof(uarts) / sizeof(uarts[0]))
static struct rt_serial_device serial_devices[UART_COUNT];
static rt_err_t mcxc444_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct mcxc444_uart *uart = (struct mcxc444_uart *)serial->parent.user_data;
lpuart_config_t config;
LPUART_GetDefaultConfig(&config);
config.baudRate_Bps = cfg->baud_rate;
config.enableTx = true;
config.enableRx = true;
switch (cfg->data_bits)
{
case DATA_BITS_8:
config.dataBitsCount = kLPUART_EightDataBits;
break;
default:
return RT_ERROR;
}
switch (cfg->stop_bits)
{
case STOP_BITS_1:
config.stopBitCount = kLPUART_OneStopBit;
break;
case STOP_BITS_2:
config.stopBitCount = kLPUART_TwoStopBit;
break;
default:
return RT_ERROR;
}
switch (cfg->parity)
{
case PARITY_NONE:
config.parityMode = kLPUART_ParityDisabled;
break;
case PARITY_ODD:
config.parityMode = kLPUART_ParityOdd;
break;
case PARITY_EVEN:
config.parityMode = kLPUART_ParityEven;
break;
default:
return RT_ERROR;
}
if (uart->uart_base == LPUART0)
{
CLOCK_SetLpuart0Clock(0x1U);
}
else if (uart->uart_base == LPUART1)
{
CLOCK_SetLpuart1Clock(0x1U);
}
LPUART_Init(uart->uart_base, &config, CLOCK_GetFreq(kCLOCK_McgIrc48MClk));
return RT_EOK;
}
static rt_err_t mcxc444_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct mcxc444_uart *uart = (struct mcxc444_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
LPUART_DisableInterrupts(uart->uart_base, kLPUART_RxDataRegFullInterruptEnable);
DisableIRQ(uart->irqn);
break;
case RT_DEVICE_CTRL_SET_INT:
LPUART_EnableInterrupts(uart->uart_base, kLPUART_RxDataRegFullInterruptEnable);
EnableIRQ(uart->irqn);
break;
}
return RT_EOK;
}
static int mcxc444_putc(struct rt_serial_device *serial, char ch)
{
struct mcxc444_uart *uart = (struct mcxc444_uart *)serial->parent.user_data;
LPUART_WriteByte(uart->uart_base, ch);
while (!(LPUART_GetStatusFlags(uart->uart_base) & kLPUART_TxDataRegEmptyFlag));
return 1;
}
static int mcxc444_getc(struct rt_serial_device *serial)
{
int ch;
struct mcxc444_uart *uart = (struct mcxc444_uart *)serial->parent.user_data;
if (LPUART_GetStatusFlags(uart->uart_base) & kLPUART_RxDataRegFullFlag)
{
ch = LPUART_ReadByte(uart->uart_base);
return ch;
}
else
{
return -1;
}
}
static void uart_isr(struct rt_serial_device *serial)
{
uint32_t status;
struct mcxc444_uart *uart = (struct mcxc444_uart *)serial->parent.user_data;
status = LPUART_GetStatusFlags(uart->uart_base);
if (status & kLPUART_RxDataRegFullFlag)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
if (status & kLPUART_RxOverrunFlag)
{
LPUART_ClearStatusFlags(uart->uart_base, kLPUART_RxOverrunFlag);
}
}
static const struct rt_uart_ops mcxc444_uart_ops =
{
mcxc444_configure,
mcxc444_control,
mcxc444_putc,
mcxc444_getc,
};
#ifdef BSP_USING_UART0
void LPUART0_IRQHandler(void)
{
uart_isr(&serial_devices[0]);
}
#endif
#ifdef BSP_USING_UART1
void LPUART1_IRQHandler(void)
{
uart_isr(&serial_devices[1]);
}
#endif
int rt_hw_uart_init(void)
{
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
for (rt_size_t i = 0; i < UART_COUNT; i++)
{
serial_devices[i].ops = &mcxc444_uart_ops;
serial_devices[i].config = config;
rt_hw_serial_register(&serial_devices[i], uarts[i].device_name,
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
(void *)&uarts[i]);
}
return 0;
}
INIT_BOARD_EXPORT(rt_hw_uart_init);
#endif /* RT_USING_SERIAL */
|
