Hi,
I'd like to contribute a driver for the MCP356x ADCs. I have an 8-channel MCP3564 and PicoW (RP2040 & RP2350).
I'm taking a look at the datasheet, a C lib for ESP32 and the existing TinyGo driver for MCP3008.
I'm pretty green to the embedded space and low-level programming in general, but after some head banging and LLM help, I got some single-ended readings off one of the channels.
I do have a few (maybe obvious) questions to start. Since this is a 24-bit ADC, would consumers generally expect [channel].Get() to return
- a scaled-up
int32?
- Or a
uint32 and have them deal with the sign?
- Or a scaled-down
uint16 like the other ADCs and then expose a [channel].Get32() int32?
I did the two Get() uint16 and Get32() imt32 on the for spike, but I wasn't sure.
Also, this chip has a ton of configurable options. Does anyone have an idea about some sane defaults? I haven't used enough ADCs to get a feel for what's expected out of the box. It probably already has some default state, but whatever it was didn't work for my use-case. I just wanted to read a steady voltage off a pot using the internal VREF and clock. I kept getting 0's with the initial config, but honestly, there could have been a ton of other factors preventing the read.
I'll check the C lib and datasheet and see if there's any guidance there.
Hi,
I'd like to contribute a driver for the MCP356x ADCs. I have an 8-channel MCP3564 and PicoW (RP2040 & RP2350).
I'm taking a look at the datasheet, a C lib for ESP32 and the existing TinyGo driver for MCP3008.
I'm pretty green to the embedded space and low-level programming in general, but after some head banging and LLM help, I got some single-ended readings off one of the channels.
I do have a few (maybe obvious) questions to start. Since this is a 24-bit ADC, would consumers generally expect
[channel].Get()to returnint32?uint32and have them deal with the sign?uint16like the other ADCs and then expose a[channel].Get32() int32?I did the two
Get() uint16andGet32() imt32on the for spike, but I wasn't sure.Also, this chip has a ton of configurable options. Does anyone have an idea about some sane defaults? I haven't used enough ADCs to get a feel for what's expected out of the box. It probably already has some default state, but whatever it was didn't work for my use-case. I just wanted to read a steady voltage off a pot using the internal VREF and clock. I kept getting
0's with the initial config, but honestly, there could have been a ton of other factors preventing the read.I'll check the C lib and datasheet and see if there's any guidance there.