[1970] | 1 | //pwm.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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| 5 | * |
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| 6 | * This file is part of libroardsp a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroardsp is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #include "libroarlight.h" |
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| 26 | |
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[1972] | 27 | uint16_t _g_roar_lpwm16[] = { |
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| 28 | 0x0000, 0x0001, 0x0101, 0x0111, 0x1111, 0x1115, 0x1515, 0x1555, |
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| 29 | 0x5555, 0x5557, 0x5757, 0x5777, 0x7777, 0x777F, 0x7F7F, 0x7FFF, |
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| 30 | 0xFFFF |
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| 31 | }; |
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| 32 | |
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| 33 | int roar_light_pwm_new (struct roar_lpwm_state * state, int bits ) { |
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| 34 | if ( state == NULL ) |
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| 35 | return -1; |
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| 36 | |
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| 37 | if ( bits < 1 || bits > 32 ) |
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| 38 | return -1; |
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| 39 | |
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| 40 | state->bits = bits; |
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| 41 | |
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| 42 | return roar_light_pwm_set(state, 0); |
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| 43 | } |
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| 44 | |
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| 45 | int roar_light_pwm_set (struct roar_lpwm_state * state, int value) { |
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| 46 | if ( state == NULL ) |
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| 47 | return -1; |
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| 48 | |
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| 49 | if ( value < 0 || value > state->bits ) |
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| 50 | return -1; |
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| 51 | |
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| 52 | state->value = value; |
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| 53 | |
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| 54 | return 0; |
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| 55 | } |
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| 56 | |
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| 57 | int roar_light_pwm_send(struct roar_lpwm_state * state, struct roar_vio_calls * vio, size_t len) { |
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| 58 | char * buf; |
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| 59 | int16_t * buf16; |
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| 60 | size_t todo = len; |
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| 61 | uint64_t s; |
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| 62 | |
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| 63 | if ( state == NULL ) |
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| 64 | return -1; |
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| 65 | |
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| 66 | if ( vio == NULL ) |
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| 67 | return -1; |
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| 68 | |
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| 69 | if ( state->bits != 16 ) |
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| 70 | return -1; |
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| 71 | |
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| 72 | if ( (buf = malloc(len)) == NULL ) |
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| 73 | return -1; |
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| 74 | |
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| 75 | buf16 = (int16_t *) buf; |
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| 76 | |
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| 77 | while (todo > 1) { |
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| 78 | if ( state->fill < 16 ) { |
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| 79 | s = _g_roar_lpwm16[state->value]; |
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| 80 | s <<= state->fill; |
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| 81 | state->s |= s; |
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| 82 | } |
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| 83 | |
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| 84 | *buf16 = state->s & 0xFFFF; |
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| 85 | state->s >>= 16; |
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| 86 | state->fill -= 16; |
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| 87 | |
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| 88 | buf16++; |
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| 89 | todo -= 2; |
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| 90 | } |
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| 91 | |
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| 92 | if ( todo ) { |
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| 93 | buf[len-1] = state->s & 0xFF; |
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| 94 | state->s >>= 8; |
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| 95 | state->fill -= 8; |
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| 96 | } |
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| 97 | |
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| 98 | if ( roar_vio_write(vio, buf, len) != len ) { |
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| 99 | free(buf); |
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| 100 | return -1; |
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| 101 | } |
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| 102 | |
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| 103 | free(buf); |
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| 104 | |
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| 105 | return 0; |
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| 106 | } |
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| 107 | |
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[1970] | 108 | //ll |
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