fixup! cpu/efm32: implement periph_timer_periodic for series 0/1

tests/periph/uart_locate_pins/Makefile

@@ -7,15 +7,11 @@ INCLUDES += -I$(abspath $(CURDIR))/include
 include ../Makefile.periph_common
 
 USEMODULE += soft_uart
+USEMODULE += fmt
+# we do not need stdio
 USEMODULE += stdio_null
 
-include $(RIOTBASE)/Makefile.include
+# We do not need multi-threading for this app
+DISBALE_MODULE += core_thread
 
-ifneq ($(MCU),esp32)
-  # We only need 1 thread (+ the Idle thread on some platforms) and we really
-  # want this app working on all boards.
-  CFLAGS += -DMAXTHREADS=2
-else
-  # ESP32x SoCs uses an extra thread for esp_timer
-  CFLAGS += -DMAXTHREADS=3
-endif
+include $(RIOTBASE)/Makefile.include

tests/periph/uart_locate_pins/main.c

@@ -18,9 +18,10 @@
  *
  * @}
  */
-#include <stdio.h>
+#include <stdint.h>
 
 #include "container.h"
+#include "fmt.h"
 #include "macros/units.h"
 #include "periph/gpio.h"
 #include "periph/timer.h"
@@ -34,8 +35,8 @@
  * pins, e.g. pins connected to crystals, etc. may not react friendly to be
  * used as output */
 static const struct {
-    unsigned port_num;
-    unsigned pin_num;
+    uint8_t port_num;
+    uint8_t pin_num;
 } pins[] = {
     {
         .port_num = 0,
@@ -60,10 +61,20 @@ int main(void)
             soft_uart_config[0].tx_pin = pin;
             soft_uart_init(0, UART_SYMBOL_RATE, NULL, NULL);
             static char buf[32];
-            size_t len = snprintf(buf, sizeof(buf), "P%u.%u / P%c%u\n",
-                    pins[i].port_num, pins[i].pin_num,
-                    (int)'A' + (int)pins[i].port_num, pins[i].pin_num);
-            soft_uart_write(0, (void *)buf, len);
+            char *pos = buf;
+            *pos++ = 'P';
+            pos += fmt_u16_dec(pos, pins[i].port_num);
+            *pos++ = '.';
+            pos += fmt_u16_dec(pos, pins[i].pin_num);
+            *pos++ = ' ';
+            *pos++ = '/';
+            *pos++ = ' ';
+            *pos++ = 'P';
+            *pos++ = (char)((int)'A' + (int)pins[i].port_num);
+            pos += fmt_u16_dec(pos, pins[i].pin_num);
+            *pos++ = '\n';
+
+            soft_uart_write(0, (void *)buf, (size_t)pos - (size_t)buf);
             soft_uart_poweroff(0);
         }
     }