Added some helper functions to St7735IO

src/st7735.rs

@@ -332,18 +332,40 @@ impl St7735 {
                 -> St7735IO<SPIAddr, GPIOAddr>
         where SPIAddr: Location,
                 GPIOAddr: Location {
-        St7735IO {
-            st7735: self,
-            spi : spi,
-            gpio : gpio
-        }
+        St7735IO::start(self, spi, gpio)
     }
 }
 
+
 impl<SPIAddr, GPIOAddr> St7735IO<SPIAddr, GPIOAddr>
     where SPIAddr: Location,
             GPIOAddr: Location {
 
+    pub fn start(st7735 : St7735, mut spi : PeripheralRef<spi::SPI, SPIAddr>, gpio : PeripheralRef<gpio::GPIO, GPIOAddr>)
+                -> St7735IO<SPIAddr, GPIOAddr>
+        where SPIAddr: Location,
+                GPIOAddr: Location {
+
+        spi.configure(|s| {
+            s.set_enabled(true)
+            .set_master_mode(true)
+            .set_software_slave_select(true)
+            .set_clock_divider(128)
+            // required for master mode, even if ss is done manually
+            .set_slave_select_output_enabled(true)
+        });
+
+        let mut io = St7735IO {
+            st7735: st7735,
+            spi : spi,
+            gpio : gpio
+        };
+
+        io.set_cs();
+
+        io
+    }
+
     fn set_rs(&mut self) {
         self.gpio.set_bit(self.st7735.rs_pin);
     }
@@ -386,11 +408,39 @@ impl<SPIAddr, GPIOAddr> St7735IO<SPIAddr, GPIOAddr>
         delay_ms(500);
     }
 
+    fn write_byte(&mut self, byte : u8) {
+        self.spi.set_data(byte as u32);
+        while self.spi.busy() {}
+    }
+
+    fn write_data_byte(&mut self, data : u8) {
+        self.set_rs();
+
+        self.reset_cs();
+        self.write_byte(data);
+        self.set_cs();
+    }
+
+    fn write_command_byte(&mut self, cmd : u8) {
+        self.set_rs();
+
+        self.reset_cs();
+        self.write_byte(cmd);
+        self.set_cs();
+    }
+
+    pub fn write_command(&mut self, cmd : Command) {
+        let cmd_byte = command_to_byte(cmd);
+        self.write_command_byte(cmd_byte);
+    }
+
     pub fn init(&mut self) {
 
     }
 
-    pub fn done(self) -> (St7735, PeripheralRef<spi::SPI, SPIAddr>, PeripheralRef<gpio::GPIO, GPIOAddr>) {
+    pub fn done(mut self) -> (St7735, PeripheralRef<spi::SPI, SPIAddr>, PeripheralRef<gpio::GPIO, GPIOAddr>) {
+        self.set_cs();
+        self.spi.set_enabled(false);
         (self.st7735, self.spi, self.gpio)
     }
 }