devices: add basic support for ATtiny1626

Pull in the ATDF file from Microchip and add all the necessary plumbing
around the code-base to make it compile.

It hasn't been tested much yet. So far, I've tested some accesses to the
PORTx register on hardware. The common patches for the xmega series seem
reasonable, so I've applied them. Additionally, VPORTA.DIR was patched
out for 2 series devices because it doesn't work. VPORTA.DIR is mapped
to memory address 0x0. This address is commonly used as NULL pointer and
it looks like rust isn't able to handle accesses to that address [1]. To
check that, I've created a short example programm accessing VPORTA.DIR
[2] and checking the resulting binary with avr-objdump [3]. The produced
binary panics as soon as I'm trying to access VPORTA.DIR [4]. By
changing the code to access a different register of VPORTA like OUT, the
code produces a sane binary [5].

[1] https://users.rust-lang.org/t/reading-from-physical-address-0x0/117408/2
[2]
```
#![no_std]
#![no_main]

use panic_halt as _;

pub extern "C" fn main() -> ! {
    let dp = unsafe { avr_device::attiny1626::Peripherals::steal() };
    dp.vporta.dir().write(|w| w.set(1 << 7));
    loop {}
}
```
[3] `avr-objdump -D -m tinyavr2 target/avr-none/debug/test.elf`
[4]
```
000000a0 <main>:
  a0:   81 e0           ldi     r24, 0x01       ; 1
  a2:   80 93 00 38     sts     0x3800, r24     ; 0x803800 <DEVICE_PERIPHERALS>
  a6:   0e 94 59 00     call    0xb2    ; 0xb2 <_ZN4core9panicking14panic_nounwind17h63d81beb9bde1088E>
```
[5]
```
000000a0 <main>:
  a0:   81 e0           ldi     r24, 0x01       ; 1
  a2:   80 93 00 38     sts     0x3800, r24     ; 0x803800 <DEVICE_PERIPHERALS>
  a6:   80 e8           ldi     r24, 0x80       ; 128
  a8:   81 b9           out     0x01, r24       ; 1
  aa:   ff cf           rjmp    .-2             ; 0xaa <.Luint32_t_name+0x3>
```

Signed-off-by: Corvin Köhne <c.koehne@beckhoff.com>

Author: ckoehne

Cargo.toml

@@ -77,6 +77,7 @@ attiny861 = ["device-selected"]
 attiny88 = ["device-selected"]
 attiny1606 = ["device-selected"]
 attiny1614 = ["device-selected"]
+attiny1626 = ["device-selected"]
 avr64du32 = ["device-selected"]
 avr64du28 = ["device-selected"]
 rt = ["avr-device-macros"]

README.md

@@ -35,6 +35,7 @@ Via the feature you can select which chip you want the register specifications f
 |                 |              |                   |               |  `attiny861`  |
 |                 |              |                   |               | `attiny1606`  |
 |                 |              |                   |               | `attiny1614`  |
+|                 |              |                   |               | `attiny1626`  |
 |                 |              |                   |               | `attiny2313`  |
 |                 |              |                   |               | `attiny2313a` |
 

src/devices.rs

@@ -183,6 +183,12 @@ pub mod attiny1614 {
     include!(concat!(env!("OUT_DIR"), "/pac/attiny1614.rs"));
 }
 
+/// [ATtiny1626](https://www.microchip.com/wwwproducts/en/ATtiny1626)
+#[cfg(feature = "attiny1626")]
+pub mod attiny1626 {
+    include!(concat!(env!("OUT_DIR"), "/pac/attiny1626.rs"));
+}
+
 /// [ATtiny202](https://www.microchip.com/wwwproducts/en/ATtiny202)
 #[cfg(feature = "attiny202")]
 pub mod attiny202 {

src/lib.rs

@@ -30,6 +30,7 @@
 #![cfg_attr(feature = "attiny167", doc = "**attiny167**,")]
 #![cfg_attr(feature = "attiny1606", doc = "**attiny1606**,")]
 #![cfg_attr(feature = "attiny1614", doc = "**attiny1614**,")]
+#![cfg_attr(feature = "attiny1626", doc = "**attiny1626**,")]
 #![cfg_attr(feature = "attiny202", doc = "**attiny202**,")]
 #![cfg_attr(feature = "attiny212", doc = "**attiny212**,")]
 #![cfg_attr(feature = "attiny214", doc = "**attiny214**,")]
@@ -89,6 +90,7 @@
 //! `attiny13a`,
 //! `attiny167`,
 //! `attiny1614`,
+//! `attiny1626`,
 //! `attiny202`,
 //! `attiny212`,
 //! `attiny214`,
@@ -264,6 +266,7 @@ compile_error!(
     * attiny167
     * attiny1606
     * attiny1614
+    * attiny1626
     * attiny202
     * attiny212
     * attiny214
@@ -351,6 +354,8 @@ pub use crate::devices::attiny13a;
 pub use crate::devices::attiny1606;
 #[cfg(feature = "attiny1614")]
 pub use crate::devices::attiny1614;
+#[cfg(feature = "attiny1626")]
+pub use crate::devices::attiny1626;
 #[cfg(feature = "attiny167")]
 pub use crate::devices::attiny167;
 #[cfg(feature = "attiny202")]