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Forum Index : Microcontroller and PC projects : PicoMite: MCP4922 DAC on SPI
| Author | Message | ||||
| Calli Regular Member  Joined: 20/10/2021 Location: GermanyPosts: 74 |
I used this DAC before and think it is a nice chip. Here is some code which works for me and might get you started. ' MCP4922 Dual 12bit DAC SetPin GP2,GP3,GP4,SPI SetPin GP6, DOUT Pin(GP6) = 1 SPI open 4000000,0,16 Do For a% = 0 To 4096-8 Step 64 ' CS Down (LOW Active) Pin(GP6)=0 ' DACn Write Buffer Gain_ Shutdown_ ' DWBGS junk = SPI(&B0111000000000000 + a%) ' 1st DAC Pin(GP6)=1 Pin(GP6)=0 junk = SPI(&B1111000000000000 + a%) ' 2nd DAC ' CS Pin(GP6)=1 'Print a% 'Pause 300 Next a% Loop SPI CLose Datasheet: https://www.mouser.de/datasheet/2/268/21897a-70809.pdf Be sure to get the active LOW-Pins LDAC_ and SHDN_ right, LDAC_ to LOW/GND will trigger the conversion every time the CS_ is rised, so we can save one Pin on the Picomite. Tie SHDN_to VDD to have the chip work. Cheers, Carsten |
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| Tinine Guru  Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
Appreciated but can I suggest somewhere that it won't get lost? |
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| Calli Regular Member Joined: 20/10/2021 Location: GermanyPosts: 74 |
http://www.fruitoftheshed.com/MMBasic.PicoMite-MCP4922-DAC-on-SPI.ashx C! |
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| twofingers Guru Joined: 02/06/2014 Location: GermanyPosts: 1526 |
Thanks Carsten!  FYI something similar from Peter (matherp): Micromite MK2: MCP4822 DAC Best regards Michael BTW: Micromite MK2:MCP342x i2c ADCs causality ≠ correlation ≠ coincidence |
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