Enable system clock before enabling ADC0 (#26)

* NOT FOR RELEASE: Disable ADC

* NOT FOR RELEASE: Check if ADC0 is available on testing boards

* NOT FOR RELEASE: System clock before ADC0 enable

* NOT FOR RELEASE: Confirm clock needed to be enabled

* NOT FOR RELEASE: Check if ADC0 is available on testing boards (again)

* NOT FOR RELEASE: System clock before ADC0 enable (again)

* NOT FOR RELEASE: Confirm bug

* Final sanity check

Author: WhiteHoodHacker

docker_env/src/bin/fob.rs

@@ -238,15 +238,6 @@ fn paired_fob_pairing() {
     return
   }
 
-  // Took too long...
-  if get_remaining_us_delay_timer() < 100_000 {
-    wait_delay_timer();
-    sleep_us(4_000_000);
-    uart_writeb_board(MAGIC_PAIR_RST);
-    log!("Paired fob: Sent PAIR_RST to unpaired fob");
-    return
-  }
-
   // 5. Compute hash equality
   let mut eeprom_pin_hash_w: [u32; LENW_PIN_HASH] = [0; LENW_PIN_HASH];
   eeprom_read(&mut eeprom_pin_hash_w, FOBMEM_PIN_HASH);

docker_env/tivaware/driverlib/wrapper.c

@@ -118,6 +118,9 @@ static void tick_timer_init(void) {
  * This function initializes the system peripherals and sets up the board link.
  */
 void init_system(void) {
+  // Set the clocking to run directly from the crystal.
+  SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_INT);
+
   // Initialize the ADC temperature sensor
   adc_init();