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10 check-ins using file LPCWorkspace/PDMSPL/src/pwm.c or LCPworkspace/PDMSPL/src/pwm.c version de1f6dc46d
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2015-03-27
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| 01:04 | Added second sonar driving the blue LED. The GRN sonar is active low during PCM sample processing. The BLU sonar is active low in the main loop. check-in: 1fe01e0ab5 user: rberteig tags: trunk | |
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2015-03-17
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| 00:48 | Added a mu-Law codec to the record over UART feature to provide for 14-bit effective dynamic range in the captured recordings, which matches the dynamic range actually produced by the PDM to PCM conversion as implemented. check-in: 1d38441bbc user: rberteig tags: trunk | |
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2015-03-10
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| 22:54 | Replaced subtracting average sample value with a simple single pole IIR high pass filter rolling off at 20Hz. Added mechanism for dumping scaled 8-bit PCM samples to the UART for analysis on the PC. Tested with recording of room audio. check-in: 5218c33e38 user: rberteig tags: trunk | |
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2015-03-06
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| 00:24 | Merged latest demo board documentation improvements. check-in: 8de46c10f4 user: rberteig tags: trunk | |
| 00:22 | Added documentation on wiring the demo board for the SPL firmware demo. Leaf check-in: 395121d803 user: rberteig tags: LPC | |
| 00:08 | Clarify license terms for the repository as a whole and the PDMSPL firmware specifically. Also better document the process of getting started with the firmware in LPCXpresso. check-in: cf49dbb08b user: rberteig tags: LPC | |
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2015-03-05
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| 23:27 | Rename workspace folder to fix typo. check-in: 383d02d249 user: rberteig tags: LPC | |
| 02:49 | Source code for the SPL meter using a PDM microphone running on an NXP LPC812 CPU. This is a snapshot of the build environment, and testing here has concentrated on whether it builds for me in LPCXpresso running on Windows 7 Pro. check-in: 2dd7a655f3 user: rberteig tags: trunk | |
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2015-03-04
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| 22:22 | Fixed project configuration issue in the board and chip sub-projects that caused the IDE to use the wrong runtime library and fail to locate printf(). The IDE can now build both release and debug configurations. Closed-Leaf check-in: 0873085600 user: rberteig tags: LPC | |
| 20:02 | Snapshot of LPCXpresso project first import of firmware that worked when built outside of this repository. Not yet ready for publication as it doesn't quite build without error in this snapshot. check-in: b4d3161963 user: rberteig tags: LPC | |