| 2 Jul 2020 |
 mtthw.meyer | DMA def feels a bit raw still | 17:59:39 |
| mtthw.meyer | I'm going to hardcode settings that work for my board first then go back and make it more general. We'll need to discuss how much of it we want to generalize because there are ALOT of settings. | 18:10:43 |
| mtthw.meyer | Making it somewhat generalized as I go. | 18:11:30 |
 bobmcwhirter | given I'm a new rust coder, anyone willing to critique this nowhere-near-done embedded-nal TcpStack for an esp8266? https://github.com/drogue-iot/drogue-esp8266/blob/master/src/lib.rs | 18:24:49 |
| bobmcwhirter | liberally cribbed from someone's ublox TcpStack. | 18:25:01 |
 agg | mtthw.meyer: I think you can directly get the address of the register, rather than peripheral base and adding an offset yourself | 18:35:43 |
| mtthw.meyer | Hmm, it says it wants the "base address". So it just wants the block location vs the specific data reg? | 18:38:18 |
| agg | Not sure for SAI, does it have its own DMA or is this using the main DMA peripheral? Usually you program the specific register address you want it to read/write | 18:39:18 |
| mtthw.meyer | Main DMA. DMA_SxPAR | 18:40:03 |
| mtthw.meyer | Yeah I guess it wants the data reg addr directly | 18:41:44 |
 Lumpio- | Which chip is it | 18:41:58 |
| mtthw.meyer | stm32h750 | 18:42:11 |
| mtthw.meyer | STM32H750IBK6 | 18:42:22 |
| Lumpio- | lol how many DMA controllers does this thing have | 18:42:57 |
| mtthw.meyer | All of them. | 18:43:04 |
| Lumpio- | >MDMA controller | 18:43:10 |
| Lumpio- | That's illegal | 18:43:12 |
| Lumpio- | Anyways I'm pretty sure the DMA just wants the peripheral address to write to and nothing else | 18:48:19 |
| Lumpio- | And indeed you can get the register address by just taking the address of the register field and casting it to a suitable integer | 18:48:46 |
| mtthw.meyer | stm32::SAI1::ptr() as u32 | 18:50:37 |
| Lumpio- | That's the entire register block | 18:52:02 |
| mtthw.meyer | Ok well I don't see anything to extract the data reg directly so I can just offset it | 19:03:48 |
 adamgreig | Just dereference the struct field | 19:05:20 |
| adamgreig | If you alret have the peripheral instance just like &sai.data as *const u32 as u32 | 19:05:47 |
| mtthw.meyer | Those structs actually point directly to the reg block like that? | 19:06:55 |
| agg | Effectively | 19:14:34 |
| agg | The struct implements Deref to the RegisterBlock | 19:14:51 |
| mtthw.meyer | casting &stm32h7::generic::Reg<u32, stm32h7::stm32h743v::sai4::ch::_DR> as *const u32 is invalid | 19:19:36 |
| mtthw.meyer | audio_ch: &stm32::sai4::CH | 19:20:33 |
| mtthw.meyer | &audio_ch.dr as *const u32 as u32 | 19:20:38 |
