diff --git a/api/HardwareSPI.h b/api/HardwareSPI.h
index a851b937..d6609469 100644
--- a/api/HardwareSPI.h
+++ b/api/HardwareSPI.h
@@ -104,22 +104,24 @@ const SPISettings DEFAULT_SPI_SETTINGS = SPISettings();
class HardwareSPI
{
public:
- virtual uint8_t transfer(uint8_t data);
- virtual uint16_t transfer16(uint16_t data);
- virtual void transfer(void *buf, size_t count);
+ virtual ~HardwareSPI() { }
+
+ virtual uint8_t transfer(uint8_t data) = 0;
+ virtual uint16_t transfer16(uint16_t data) = 0;
+ virtual void transfer(void *buf, size_t count) = 0;
// Transaction Functions
- virtual void usingInterrupt(int interruptNumber);
- virtual void notUsingInterrupt(int interruptNumber);
- virtual void beginTransaction(SPISettings settings);
- virtual void endTransaction(void);
+ virtual void usingInterrupt(int interruptNumber) = 0;
+ virtual void notUsingInterrupt(int interruptNumber) = 0;
+ virtual void beginTransaction(SPISettings settings) = 0;
+ virtual void endTransaction(void) = 0;
// SPI Configuration methods
- virtual void attachInterrupt();
- virtual void detachInterrupt();
+ virtual void attachInterrupt() = 0;
+ virtual void detachInterrupt() = 0;
- virtual void begin();
- virtual void end();
+ virtual void begin() = 0;
+ virtual void end() = 0;
};
// Alias SPIClass to HardwareSPI since it's already the defacto standard for SPI classe name
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