feat: Include watchdog register

Also shorten error messages

jacdac-c

@@ -1 +1 @@
-Subproject commit 315e7eb95d44f6685ffabfe7fb4e37a36f79c042
+Subproject commit 4d17c9bdf347956e3edc81a7f3a029f5d758068c

stm32/dspi.c

@@ -345,7 +345,7 @@ static void init_lookup(void) {
 
 // this is only enabled for error events
 void IRQHandler(void) {
-    DMESG("SPI handler!");
+    ERROR("SPI");
 }
 
 void DMA_Handler(void) {

stm32/rtc.c

@@ -211,7 +211,7 @@ void rtc_init() {
 
     int tmp = US_TO_TICKS(RTC_SECOND_IN_US);
     uint32_t h_ms = US_TO_TICKS(100000);
-    DMESG("rtc: 100ms = %d ticks; ctx->presc=%d", h_ms, tmp);
+    DMESG("rtc: 100ms=%d ticks; presc=%d", h_ms, tmp);
     // we're expecting around 4000, but there's large drift possible
     if (!(3000 <= h_ms && h_ms <= 5000))
         jd_panic();

stm32/uart.c

@@ -75,10 +75,10 @@ void DMA_Handler(void) {
         uart_disable();
         if (isr & DMA_ISR_TCIF5) {
             // overrun?
-            DMESG("USARTx RX OK, but how?!");
+            // DMESG("USARTx RX OK, but how?!");
             jd_rx_completed(-1);
         } else {
-            DMESG("USARTx RX Error");
+            // DMESG("USARTx RX Error");
             jd_rx_completed(-2);
         }
     }
@@ -105,7 +105,7 @@ void DMA_Handler(void) {
                 ;
 #endif
         } else {
-            DMESG("USARTx TX Error");
+            ERROR("TX err");
             errCode = -1;
         }