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| toh:seeed:linkit7688 [2020/11/20 20:17] – add Breakoutboard patchfile novski | toh:seeed:linkit7688 [2022/06/03 11:57] – link to post for other undocumented uboot options frollic | ||
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| Use the UART Console and *Hidden* Option 5 | Use the UART Console and *Hidden* Option 5 | ||
| + | There are other hidden options available, read https:// | ||
| <WRAP bootlog> | <WRAP bootlog> | ||
| < | < | ||
| Line 701: | Line 701: | ||
| Digital pin input voltage(on WM8960 ): 1.71~3.6V | Digital pin input voltage(on WM8960 ): 1.71~3.6V | ||
| - | **Build changes are needed to use Audio** | + | **some Build changes are needed to use Audio** |
| - | This is a `git patch` file so copy that to a file in the /openwrt bildroot folder and execute it with git patch < | + | We add i2s as audio i/o and define i2c to control the audio chip so a volume and other controls is present afterwards. |
| + | |||
| + | This is a `git patch` file so copy that to a file in the /openwrt bildroot folder and execute it with `patch -p1 < {filename}` or `git am {filename}. | ||
| < | < | ||
| diff --git a/ | diff --git a/ | ||
| Line 788: | Line 790: | ||
| </ | </ | ||
| + | **Build** | ||
| + | go to your buildpath and type < | ||
| + | After flashing the image you can use < | ||
| + | ** Be careful! High volumes can damage your ears.** | ||
| + | * Headphone (if you use external Amplifier or headphone via 3.5mm jack outlet) = choose volume | ||
| + | * Speaker (About -10dB is a good test volume) = choose volume | ||
| + | * Speaker AC = 0 | ||
| + | * Speaker DC = 0 | ||
| + | * Left Mixer Output PCM = unmute | ||
| + | * Right Mixer Output PCM = unmute | ||
| + | |||
| + | Then try to play with alsa-utils-test like this in the terminal of the device:< | ||
| + | You then should hear a woman speaking " | ||
| + | |||
| + | If you want to mix an external signal over the aux input try to higher the input 2 volumes in $alsamixer. (untested) | ||
| + | Try playing a .wav file with: < | ||