nrf: add NVMC driver.

embassy-nrf/src/chips/nrf52832.rs

@@ -4,6 +4,12 @@ pub use nrf52832_pac as pac;
 pub const EASY_DMA_SIZE: usize = (1 << 8) - 1;
 pub const FORCE_COPY_BUFFER_SIZE: usize = 255;
 
+// There are two variants. We set the higher size to make the entire flash
+// usable in xxAA, but we'll probably split this in two cargi features later.
+// nrf52832xxAA = 512kb
+// nrf52832xxAB = 256kb
+pub const FLASH_SIZE: usize = 512 * 1024;
+
 embassy_hal_common::peripherals! {
     // RTC
     RTC0,
@@ -13,6 +19,9 @@ embassy_hal_common::peripherals! {
     // WDT
     WDT,
 
+    // NVMC
+    NVMC,
+
     // RNG
     RNG,