1 #include <rthw.h>
2 #include <rtthread.h>
3
4
5 #include <stdio.h>
6 #include <stdint.h>
7 #include <string.h>
8
9 #include "system.h"
10 #include "sys/alt_irq.h"
11 #include "altera_avalon_uart_regs.h"
12
13 extern int alt_irq_register (alt_u32 id,
14 void* context,
15 void (*alt_isr_func)(void* isr_context, alt_u32 id) );
16
set_baudrate(unsigned int baudrate)17 static void set_baudrate(unsigned int baudrate)
18 {
19 IOWR_ALTERA_AVALON_UART_DIVISOR(RS232_BASE,
20 (unsigned int)(ALT_CPU_FREQ/baudrate+0.5) );
21 }
22
23 /********* rt-thread *********/
24 #include <rtthread.h>
25
26 struct rt_device uart_device;
27 uint8_t rx_buf[100];
28 uint32_t rx_put_index;
29 uint32_t rx_get_index;
30
rt_uart_init(rt_device_t dev)31 static rt_err_t rt_uart_init (rt_device_t dev)
32 {
33 set_baudrate(115200);
34
35 IOWR_ALTERA_AVALON_UART_CONTROL(RS232_BASE, 0x80);//接收中断使能
36 IOWR_ALTERA_AVALON_UART_STATUS(RS232_BASE, 0x0); // clean status
37
38 rx_put_index = 0;
39 rx_get_index = 0;
40
41 return RT_EOK;
42 }
43
rt_uart_open(rt_device_t dev,rt_uint16_t oflag)44 static rt_err_t rt_uart_open(rt_device_t dev, rt_uint16_t oflag)
45 {
46 return RT_EOK;
47 }
48
rt_uart_close(rt_device_t dev)49 static rt_err_t rt_uart_close(rt_device_t dev)
50 {
51 return RT_EOK;
52 }
53
rt_uart_read(rt_device_t dev,rt_off_t pos,void * buffer,rt_size_t size)54 static rt_ssize_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
55 {
56 if( rx_get_index )
57 {
58 *(uint8_t *)buffer = rx_buf[0];
59 rx_get_index--;
60 return size;
61 }
62 return 0;
63 }
64
rt_uart_write(rt_device_t dev,rt_off_t pos,const void * buffer,rt_size_t size)65 static rt_ssize_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
66 {
67 const char * write_point = buffer;
68 while(size--)
69 {
70 if(*write_point == '\n')
71 {
72 IOWR_ALTERA_AVALON_UART_TXDATA(RS232_BASE,'\r');
73 while( !(IORD_ALTERA_AVALON_UART_STATUS(RS232_BASE)&(1<<6)) ); // status bit6 : TRDY
74 }
75 IOWR_ALTERA_AVALON_UART_TXDATA(RS232_BASE,*write_point);
76 write_point++;
77 while( !(IORD_ALTERA_AVALON_UART_STATUS(RS232_BASE)&(1<<6)) ); // status bit6 : TRDY
78 }
79
80 return size;
81 }
82
rt_uart_control(rt_device_t dev,int cmd,void * args)83 static rt_err_t rt_uart_control(rt_device_t dev, int cmd, void *args)
84 {
85 return RT_EOK;
86 }
87
uart_isr(void * context,alt_u32 id)88 static void uart_isr(void * context,alt_u32 id)
89 {
90 rx_buf[rx_get_index] = IORD_ALTERA_AVALON_UART_RXDATA(RS232_BASE);
91 rx_get_index++;
92 if (uart_device.rx_indicate != RT_NULL)
93 {
94 uart_device.rx_indicate(&uart_device, 1);
95 }
96 }
97
rt_hw_uart_init(void)98 void rt_hw_uart_init(void)
99 {
100 // init uart
101 set_baudrate(115200);
102 IOWR_ALTERA_AVALON_UART_CONTROL(RS232_BASE, 0x80);//接收中断使能
103 IOWR_ALTERA_AVALON_UART_STATUS(RS232_BASE, 0x0); // clean status
104 alt_irq_register(RS232_IRQ, NULL, uart_isr);
105
106 // register device
107 uart_device.type = RT_Device_Class_Char;
108 /* device interface */
109 uart_device.init = rt_uart_init;
110 uart_device.open = rt_uart_open;
111 uart_device.close = rt_uart_close;
112 uart_device.read = rt_uart_read;
113 uart_device.write = rt_uart_write;
114 uart_device.control = rt_uart_control;
115
116 uart_device.user_data = RT_NULL;
117 uart_device.rx_indicate = RT_NULL;
118 uart_device.tx_complete = RT_NULL;
119
120 rt_device_register(&uart_device,
121 "uart", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
122 }
123