diff --git a/embassy-stm32/gen.py b/embassy-stm32/gen.py
index 97beadab2..4343d775c 100644
--- a/embassy-stm32/gen.py
+++ b/embassy-stm32/gen.py
@@ -108,15 +108,15 @@ for chip in chips.values():
                 f.write(f'impl_usart!({name});')
                 for pin, funcs in af.items():
                     if pin in pins:
-                        if func := funcs.get(f'{name}_RX'):
+                        if (func := funcs.get(f'{name}_RX')) != None:
                             f.write(f'impl_usart_pin!({name}, RxPin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_TX'):
+                        if (func := funcs.get(f'{name}_TX')) != None:
                             f.write(f'impl_usart_pin!({name}, TxPin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_CTS'):
+                        if (func := funcs.get(f'{name}_CTS')) != None:
                             f.write(f'impl_usart_pin!({name}, CtsPin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_RTS'):
+                        if (func := funcs.get(f'{name}_RTS')) != None:
                             f.write(f'impl_usart_pin!({name}, RtsPin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_CK'):
+                        if (func := funcs.get(f'{name}_CK')) != None:
                             f.write(f'impl_usart_pin!({name}, CkPin, {pin}, {func});')
 
             if block_mod == 'rng':
@@ -130,11 +130,11 @@ for chip in chips.values():
                     f.write(f'impl_spi!({name}, {clock});')
                     for pin, funcs in af.items():
                         if pin in pins:
-                            if func := funcs.get(f'{name}_SCK'):
+                            if (func := funcs.get(f'{name}_SCK')) != None:
                                 f.write(f'impl_spi_pin!({name}, SckPin, {pin}, {func});')
-                            if func := funcs.get(f'{name}_MOSI'):
+                            if (func := funcs.get(f'{name}_MOSI')) != None:
                                 f.write(f'impl_spi_pin!({name}, MosiPin, {pin}, {func});')
-                            if func := funcs.get(f'{name}_MISO'):
+                            if (func := funcs.get(f'{name}_MISO')) != None:
                                 f.write(f'impl_spi_pin!({name}, MisoPin, {pin}, {func});')
 
             if block_mod == 'i2c':
@@ -174,25 +174,25 @@ for chip in chips.values():
                 f.write(f'impl_sdmmc!({name});')
                 for pin, funcs in af.items():
                     if pin in pins:
-                        if func := funcs.get(f'{name}_CK'):
+                        if (func := funcs.get(f'{name}_CK')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, CkPin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_CMD'):
+                        if (func := funcs.get(f'{name}_CMD')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, CmdPin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D0'):
+                        if (func := funcs.get(f'{name}_D0')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D0Pin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D1'):
+                        if (func := funcs.get(f'{name}_D1')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D1Pin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D2'):
+                        if (func := funcs.get(f'{name}_D2')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D2Pin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D3'):
+                        if (func := funcs.get(f'{name}_D3')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D3Pin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D4'):
+                        if (func := funcs.get(f'{name}_D4')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D4Pin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D5'):
+                        if (func := funcs.get(f'{name}_D5')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D5Pin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D6'):
+                        if (func := funcs.get(f'{name}_D6')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D6Pin, {pin}, {func});')
-                        if func := funcs.get(f'{name}_D7'):
+                        if (func := funcs.get(f'{name}_D7')) != None:
                             f.write(f'impl_sdmmc_pin!({name}, D7Pin, {pin}, {func});')
 
             if block_name == 'TimGp16':