IEEE 802.15.4 subsystem
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Source at commit 10fb0146c3c2b3eac4481ac59af2658bdf4b8006 created 13 years 1 month ago. By Werner Almesberger, fw3/: remove probably useless RF debug output code from board.c | |
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1 | /* |
2 | * fw/board.c - Board-specific functions |
3 | * |
4 | * Written 2011 by Werner Almesberger |
5 | * Copyright 2011 Werner Almesberger |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | */ |
12 | |
13 | |
14 | #include <stdint.h> |
15 | |
16 | #include <avr/io.h> |
17 | #include <avr/interrupt.h> |
18 | |
19 | #define F_CPU 8000000UL |
20 | #include <util/delay.h> |
21 | |
22 | #include "at86rf230.h" |
23 | #include "board.h" |
24 | #include "spi.h" |
25 | |
26 | |
27 | static void set_clkm(void) |
28 | { |
29 | /* switch CLKM to 8 MHz */ |
30 | |
31 | /* |
32 | * @@@ Note: Atmel advise against changing the external clock in |
33 | * mid-flight. We should therefore switch to the RC clock first, then |
34 | * crank up the external clock, and finally switch back to the external |
35 | * clock. The clock switching procedure is described in the ATmega32U2 |
36 | * data sheet in secton 8.2.2. |
37 | */ |
38 | |
39 | spi_begin(); |
40 | spi_send(AT86RF230_REG_WRITE | REG_TRX_CTRL_0); |
41 | spi_send(CLKM_CTRL_8MHz); |
42 | spi_end(); |
43 | } |
44 | |
45 | |
46 | void reset_rf(void) |
47 | { |
48 | /* AT86RF231 data sheet, 12.4.13, reset pulse width: 625 ns (min) */ |
49 | |
50 | CLR(nRST_RF); |
51 | _delay_us(1); |
52 | SET(nRST_RF); |
53 | |
54 | /* 12.4.14: SPI access latency after reset: 625 ns (min) */ |
55 | |
56 | _delay_us(1); |
57 | |
58 | /* we must restore TRX_CTRL_0 after each reset (9.6.4) */ |
59 | |
60 | set_clkm(); |
61 | } |
62 | |
63 | |
64 | uint8_t read_irq(void) |
65 | { |
66 | return PIN(IRQ_RF); |
67 | } |
68 | |
69 | |
70 | void led(int on) |
71 | { |
72 | if (on) |
73 | SET(LED); |
74 | else |
75 | CLR(LED); |
76 | } |
77 | |
78 | |
79 | void panic(void) |
80 | { |
81 | cli(); |
82 | while (1) { |
83 | SET(LED); |
84 | _delay_ms(100); |
85 | CLR(LED); |
86 | _delay_ms(100); |
87 | } |
88 | } |
89 | |
90 | |
91 | void board_init(void) |
92 | { |
93 | /* We start with a 1 MHz/8 clock. Disable the prescaler. */ |
94 | |
95 | CLKPR = 1 << CLKPCE; |
96 | CLKPR = 0; |
97 | |
98 | /* set up all the outputs; default port value is 0 */ |
99 | |
100 | OUT(LED); |
101 | OUT(nRST_RF); /* resets the transceiver */ |
102 | OUT(SLP_TR); |
103 | } |
104 |