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doc/Buzzer-melodies: update for fc-pwt-comp and Tourmaline BUZM
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 29 Mar 2022 07:49:05 +0000
parents 2f401860e9ad
children 8ff9bce1b56e
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1 The Calypso chip includes a built-in hardware provision for driving
2f401860e9ad documentation update for buzzer melodies
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2 old-fashioned cellphone ringing buzzers. Not all Calypso phones use a buzzer
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3 as their ringing noise generator - many of the higher-end Calypso phones like
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4 Mot C155/156 and Pirelli DP-L10 use a loudspeaker driven by a MIDI player chip
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5 instead, and it appears that the legendary TSM30 phone may have used TI's
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6 Melody E1 mechanism as its ringer. However, Motorola C11x/12x and C139/140
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7 phones do use an old-fashioned buzzer, and in FreeCalypso we also work with some
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8 development boards that include one. Having thus established the relevance of
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9 the buzzer feature for FreeCalypso, we have done a bit of work toward exercising
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10 the buzzer and playing melodies through it. This article describes the
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11 available support for buzzer melodies in FC host tools.
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12
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13 Buzzer hardware capabilities
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14 ============================
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15
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16 The actual noise-making element in phones like Mot C1xx appears to be a magnetic
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17 buzzer - I previously assumed that it was a piezoelectic buzzer, but this
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18 assumption now appears to be incorrect. However, the relevant capabilities of
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19 this old-fashioned cellphone ringing buzzer are determined not so much by the
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20 physics of the actual noise-making element, but by the circuit with which it is
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21 driven. The buzzer is controlled by a single-bit digital output from the
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22 Calypso chip, different tone frequencies are generated by Calypso as digital
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23 square wave outputs, and different power control levels (for louder or softer
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24 ringing sound volume) are produced by applying PWM to the "on" phase of the tone
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25 square wave.
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26
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27 The Calypso chip allows its buzzer output to be driven with one of two different
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28 internal logic blocks: either BU or PWT. We don't have any authoritative
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29 documentation for TI's earlier DBB chips prior to Calypso, but it appears that
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30 LT and BU functions for light and buzzer control came first, built into the
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31 ARMIO block which appears to precede the GSM Skunkworks business altogether, and
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32 then at some later point the alternative PWL and PWT implementations were added.
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33
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34 When driven as BU, Calypso buzzer output can produce 255 different frequencies
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35 ranging from 99 Hz to 12.7 kHz, produced by taking the 13 MHz master clock,
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36 dividing it by 512, and then dividing it again by a programmable integer factor
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37 in the range [2,256]. This mode of driving the buzzer works ideally when
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38 non-musical output frequencies are needed, i.e., frequencies that are expressed
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39 in absolute Hz rather than musical notes.
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40
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41 PWT appears to have been added specifically to facilitate playing of ringtones
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42 that are composed of musical notes. Compared to the range of 255 possible
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43 frequencies that can be produced by BU, PWT can only produce 48 different tone
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44 frequencies, but these 48 possible PWT frequencies are special in that they
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45 closely approximate the 48 musical notes ranging from F4 to E8 in the scientific
2f401860e9ad documentation update for buzzer melodies
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46 pitch notation. These 48 musical notes of PWT range cannot be reproduced as
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47 distinct frequencies in BU mode: at the upper range beginning with A6, two or
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48 three different notes collapse to the same BU tone frequency, as the possible
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49 frequencies that can be produced from 13 MHz by the simple division implemented
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50 in BU get farther apart than successive notes of the chromatic scale. Thus if
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51 you are seeking to play ringtones that are composed of musical notes, use of PWT
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52 should be considered mandatory rather than optional. OTOH, if you are playing
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53 non-musical tones like SIT that are defined in absolute Hz, then BU will often
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54 work better.
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55
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56 Concept of buzzer melodies
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57 ==========================
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58
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59 The Calypso buzzer (either BU or PWT) is monophonic, meaning that it can only
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60 play one note at a time. Given this constraint, a playable buzzer melody can be
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61 defined as a list of {tone, volume, duration} tuples, where <tone> is the
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62 frequency to be played (BU or PWT), <volume> is the relative volume for this
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63 note (PWM volume control), and <duration> is how long this note should sound.
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64
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65 The definitions for <tone> and <volume> are straightforward - they are numbers
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66 going directly into hardware registers - but in what units should the duration
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67 of notes be reckoned? In FreeCalypso we have adopted TDMA frames of 4.615 ms
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68 (or more precisely 60/13 ms) as our unit of duration for buzzer melodies, based
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69 on this reasoning: if playing of buzzer melodies is to be incorporated into
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70 operational phone handset firmware, then TDMA frames will be the only time unit
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71 that is available natively and directly, whereas any other measurement such as
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72 milliseconds would have to be converted to TDMA frames by the firmware code.
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73 Therefore, it makes the best sense to reckon all note durations in our buzzer
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74 melodies in TDMA frames to begin with.
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75
873
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76 2022 addition: BUZM melody player engine in FC Tourmaline
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77 =========================================================
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78
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79 As of 2022 our FC Tourmaline firmware includes a new buzzer melody player
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80 engine, implemented as a RiViera-based service named BUZM. The new BUZM service
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81 sits on top of the low-level PWT buzzer driver in the same way how RiViera
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82 Audio service sits on top of the low-level DSP+L1 combo, and the API (directed
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83 toward UI firmware layers) of the new BUZM service is modeled after that of RV
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84 Audio service. The primary objective of this BUZM venture is to get rid of the
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85 Condat audio driver layer mess which we inherited from TI (it has buzzer ringing
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86 and audio tone generation entangled together in a gnarly way which we need to
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87 move away from), but this migration also provides a secondary benefit: instead
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88 of being hard-coded, buzzer melodies will now be read from files in FFS, just
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89 like E1 melodies for loudspeaker-based ringing, allowing our UI firmware design
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90 to be harmonized between the two ringer configurations.
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91
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92 The following design decisions underlie our new FC Tourmaline buzzer melody
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93 facility:
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94
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95 * Regarding the choice between BU or PWT driving, PWT has been chosen. All
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96 melodies created for playing via BUZM need to consist of musical notes F4
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97 through E8 (scientific pitch notation, 349 to 5274 Hz), as supported by
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98 Calypso PWT block.
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99
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100 * Each melody is a sequence of sounded tones (PWT), either directly abutted or
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101 separated by pauses. In actual implementation, each melody is a sequence of
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102 directly abutted entries, where each entry can be either a sounded tone or a
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103 pause. Each entry (tone or silence) has a duration, reckoned in TDMA frames
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104 as explained above.
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105
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106 * For every sounded tone in a melody, a note volume in the range [1,64] is
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107 given. If the melody is played at maximum volume, the per-note volumes will
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108 be written directly into the hardware register (PWM control in 1/64 units).
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109 If the user-specified play volume is less than 64, the actual sounding volume
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110 of each note is determined as (play_volume * note_volume / 64), with the
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111 division step rounding up - when both play_volume and note_volume are
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112 constrained in the [1,64] range, the result of the rounding-up division is
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113 also constrained in the same range.
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114
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115 In terms of tool support, each FreeCalypso PWT buzzer melody begins life as an
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116 ASCII text source in the format defined by us. It is then compiled into binary
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117 form with our fc-pwt-comp utility, and the resulting binary melody file is
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118 uploaded into FreeCalypso device FFS. For manual testing, each uploaded buzzer
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119 melody can be played with AT@BUZ command. For finished phone operation, there
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120 will be two ringtone list files (one for play-until-answer ringing tones and
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121 one for non-repeating message alert tones) that will drive ringtone selection
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122 in the phone UI.
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123
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124 The format of ASCII source files for PWT melodies is best documented by
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125 examples: see several in the ringtools/examples directory.
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126
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127 Standalone buzzer exercising (outside of FC firmware)
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128 =====================================================
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129
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130 We have a target utility (running on Calypso devices out of RAM) called
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131 buzplayer, and a front end host program called fc-buzplay. If you load and run
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132 buzplayer manually via fc-iram, you can use it to exercise the buzzer manually,
873
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133 playing any tone at any volume, in either BU or PWT mode.
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134
873
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135 fc-buzplay is a higher-level tool: it establishes out-of-firmware operation on
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136 a target Calypso device similarly to fc-loadtool (based on the same framework),
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137 but running buzplayer instead of loadagent. The original command of meaty
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138 action was/is 'play' - it reads a BU (not PWT) melody from an ASCII source file
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139 in a format that was the predecessor of our current PWT format, feeds it to
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140 buzplayer on the target, and commands buzplayer to actually play it on the
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141 physical buzzer. Later buzplayer (the target utility) was extended to support
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142 PWT in addition to BU, and fc-buzplay got a new 'playt' command - this new
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143 command plays PWT melodies, reading melody files in the same ASCII source format
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144 as fc-pwt-comp. (In actual history this ASCII source format was invented for
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145 fc-buzplay first, and then later we turned it into fc-pwt-comp.)