IEEE 802.15.4 subsystem
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IEEE 802.15.4 subsystem Git Source Tree
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| Source at commit c2dd23840ce5875deca09673fcb8abb8dc3a8e7a created 9 years 1 month ago. By Werner Almesberger, Moved fw/ and tools/ into atrf/ as well. | |
|---|---|
| 1 | /* |
| 2 | * atspi/atspi.c - ATSPI initialization and main loop |
| 3 | * |
| 4 | * Written 2008-2010 by Werner Almesberger |
| 5 | * Copyright 2008-2010 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 "regs.h" |
| 15 | #include "io.h" |
| 16 | #include "usb.h" |
| 17 | #include "atspi/ep0.h" |
| 18 | #include "version.h" |
| 19 | |
| 20 | |
| 21 | void reset_rf(void) |
| 22 | { |
| 23 | int i; |
| 24 | |
| 25 | nRST_RF = 0; |
| 26 | /* |
| 27 | * 11.4.12: min 625 ns. |
| 28 | * The pulse we generate is slightly longer than 4 us. |
| 29 | */ |
| 30 | for (i = 0; i != 10; i++); |
| 31 | nRST_RF = 1; |
| 32 | } |
| 33 | |
| 34 | |
| 35 | static void init_io(void) |
| 36 | { |
| 37 | /* |
| 38 | * Signal Mode Value |
| 39 | * |
| 40 | * MOSI push-pull 0 |
| 41 | * MISO open drain 1 (input) |
| 42 | * SCLK push-pull 0 |
| 43 | * nSS push-pull 1 |
| 44 | * nRST_RF push-pull 1 |
| 45 | * IRQ_RF open drain 1 (input) |
| 46 | * SLP_TR push-pull 0 |
| 47 | * |
| 48 | * LED push-pull 0 (set up by boot loader) |
| 49 | * |
| 50 | * all unused open drain 0 |
| 51 | */ |
| 52 | |
| 53 | MOSI = 0; |
| 54 | MOSI_MODE |= 1 << MOSI_BIT; |
| 55 | |
| 56 | SCLK = 0; |
| 57 | SCLK_MODE |= 1 << SCLK_BIT; |
| 58 | |
| 59 | nSS_MODE |= 1 << nSS_BIT; |
| 60 | |
| 61 | nRST_RF_MODE |= 1 << nRST_RF_BIT; |
| 62 | |
| 63 | SLP_TR = 0; |
| 64 | SLP_TR_MODE |= 1 << SLP_TR_BIT; |
| 65 | |
| 66 | P0 &= |
| 67 | ~((1 << 0) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7)); |
| 68 | /* change 1 << 0 to 1 << 2 once 100813 boards are reworked */ |
| 69 | P3 = 0; |
| 70 | |
| 71 | #if 0 |
| 72 | /* |
| 73 | * We can *almost* disable the pull-ups. The only obstacle is that |
| 74 | * MISO is not driven when not in use. So we either need an external |
| 75 | * pull-up/down or keep all the pull-ups on. |
| 76 | */ |
| 77 | |
| 78 | /* |
| 79 | * Disable pull-ups |
| 80 | */ |
| 81 | GPIOCN |= WEAKPUD; |
| 82 | #endif |
| 83 | |
| 84 | /* |
| 85 | * The manual says the reset is optional, but reality disagrees with |
| 86 | * this optimistic assessment quite violently. |
| 87 | */ |
| 88 | |
| 89 | reset_rf(); |
| 90 | } |
| 91 | |
| 92 | |
| 93 | void main(void) |
| 94 | { |
| 95 | init_io(); |
| 96 | |
| 97 | usb_init(); |
| 98 | ep0_init(); |
| 99 | |
| 100 | while (1) { |
| 101 | usb_poll(); |
| 102 | } |
| 103 | } |
| 104 | |
