cfg_reg: add status getter

.cargo/config

@@ -1,5 +1,5 @@
 [target.thumbv7em-none-eabihf]
-runner = "gdb -q -x gdb_config/debug.gdb"
+runner = "gdb -q -x gdb_config/fpga_config.gdb"
 rustflags = [
   "-C", "link-arg=-Tlink.x",
 ]

migen/fpga_config.py

@@ -29,7 +29,7 @@ class UrukulConnector(Module):
 		]
 
 		# Debug purposes: Tie EEM MISO to EEM MOSI
-		self.comb += eem.p[2].eq(eem.n[1])
+		self.comb += eem.p[2].eq(eem.p[1])
 
 
 if __name__ == "__main__":

src/config_register.rs

@@ -82,17 +82,29 @@ where
 		}
 	}
 
+	/*
+	 * Set configuration bits according to data field
+	 * Return status
+	 */
 	fn set_all_configurations(&mut self) -> Result<u32, Error<E>> {
 		match self.spi.transfer(&mut [
 			((self.data & 0x00FF0000) >> 16) as u8,
 			((self.data & 0x0000FF00) >>  8) as u8,
 			((self.data & 0x000000FF) >>  0) as u8,
 		]).map_err(Error::SPI) {
-			Ok(arr) => Ok(self.data),
+			Ok(arr) => Ok(
+				((arr[0] as u32) << 16) |
+				((arr[1] as u32) <<  8) |
+				arr[2] as u32
+			),
 			Err(e) => Err(e),
 		}
 	}
 
+	/*
+	 * Set configuration bits according to supplied configs
+	 * Return status
+	 */	
 	pub fn set_configurations(&mut self, configs: &mut[(CFGMask, u32)]) -> Result<u32, Error<E>> {
 		for config in configs.into_iter() {
 			// Erase the bits in the configuration region
@@ -107,9 +119,22 @@ where
 		self.set_all_configurations()
 	}
 
+	/*
+	 * Return selected configuration field
+	 */
 	pub fn get_configuration(&mut self, config_type: CFGMask) -> u8 {
 		((self.data & config_type.get_bitmask()) >> config_type.get_shift()) as u8
 	}
+
+	/*
+	 * Return status
+	 */
+	pub fn get_status(&mut self, status_type: CFGMask) -> Result<u8, Error<E>> {
+		match self.set_all_configurations() {
+			Ok(val) => Ok(((val & status_type.get_bitmask()) >> status_type.get_shift()) as u8),
+			Err(e) => Err(e),
+		}
+	}
 }
 
 impl<SPI, E> Transfer<u8> for ConfigRegister<SPI>

src/main.rs

@@ -96,7 +96,7 @@ fn main() -> ! {
 
 	let mut config = ConfigRegister::new(parts.spi1);
 	// Target configuration: 0x000FF1CE
-	hprintln!("{}", config.set_configurations(&mut [
+	hprintln!("{:#06X}", config.set_configurations(&mut [
 		(CFGMask::RF_SW,		0xE),
 		(CFGMask::LED,			0xC),
 		(CFGMask::PROFILE,		0x1),