Update readme.md

Author: n19k6

v11_honda_v1/readme.md

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+a)
+
+push: i2s data via dma
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+https://www.reddit.com/r/raspberrypipico/comments/lcmhs5/got_i2s_dac_working_with_pico/
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+ 
+
+spi via dma
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+https://vanhunteradams.com/Pico/DAC/DMA_DAC.html (SPI interface)
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+https://mcturra2000.wordpress.com/2021/08/09/rp2040-using-dma-to-set-spi-dac-mcp4921/
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+ 
+
+ 
+
+b)
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+convert pwm to analog using low filter
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+https://github.com/romilly/pico-code/blob/master/docs/fungen.md
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+ 
+
+c) r2r DAC
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+ 
+
+ 
+
+ 
+
+hardware:
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+* adafruit circuitpython DAC
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+https://www.instructables.com/Arbitrary-Wave-Generator-With-the-Raspberry-Pi-Pic/
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+ 
+
+https://learn.adafruit.com/mcp4725-12-bit-dac-tutorial
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+ 
+
+https://www.hackster.io/news/learn-how-to-use-pwm-to-generate-an-audio-signal-from-your-raspberry-pi-pico-00347dece8b8
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+ 
+
+https://github.com/rgrosset/pico-pwm-audio
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+https://datasheets.raspberrypi.com/rp2040/hardware-design-with-rp2040.pdf#page=24
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+ 
+
+ 
+
+https://datasheets.raspberrypi.com/rp2040/hardware-design-with-rp2040.pdf#page=24
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+ 
+
+ 
+
+ 
+
+a) Resistor DAC
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+https://datasheets.raspberrypi.com/rp2040/hardware-design-with-rp2040.pdf#page=24 (3.2.1. Resistor DAC)
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+https://digilent.com/reference/_media/reference/pmod/pmodr2r/pmodr2r_sch.pdf
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+ 
+
+ 
+
+ 
+
+ 
+
+b) Low Passfilter (PWM -> Analog)
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+https://github.com/romilly/pico-code/blob/master/docs/fungen.md
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+ 
+
+ 
+
+c) Dedicated DAC
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+https://datasheets.raspberrypi.com/rp2040/hardware-design-with-rp2040.pdf#page=24 (3.4.2. PCM(I2S audio, PCM5101A) [PCM]
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+https://github.com/miketeachman/micropython-i2s-examples (I2S DAC)
+
+https://github.com/romilly/pico-code/blob/master/src/pico_code/pico/experiments/pio_dac.py
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+http://blog.rareschool.com/2021/02/raspberry-pi-pico-simple-projects.html
+
+ 
+
+d) DMA
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+https://iosoft.blog/category/dma/
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+ 
+
+Kaufen (boards):
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+Berrybase:
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+Adafruit MCP4725 Breakout Board - 12-Bit DAC mit I2C Interface
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+MCP4725
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+5,10
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+12-Bit
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+I2C
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+ 
+
+Kaufen (ics):
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+ 
+
+ 
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+Hardware:
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+Pmod R2R: Resistor Ladder D/A Converter, digilent
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+ 
+
+https://circuitdigest.com/tags/mcp4725
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+