From d3699d02619061de902eb7da620d0288a56c51f9 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Tue, 18 May 2010 12:51:31 +0000 Subject: Added new ADC_DisableChannel() function (thanks to Mich Davis). --- LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h | 43 +++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h') diff --git a/LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h b/LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h index 00c18e786..f8f2b4325 100644 --- a/LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h +++ b/LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h @@ -287,6 +287,49 @@ #endif } + /** Deconfigures the given ADC channel, re-enabling digital I/O mode instead of analog. This + * function sets the associated port pin as an input and re-enabled the digital portion of + * the I/O. + * + * \note This must only be called for ADC channels with are connected to a physical port + * pin of the AVR, denoted by its special alternative function ADCx. + * \n\n + * + * \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask. + * + * \param[in] Channel ADC channel number to set up for conversions + */ + static inline void ADC_DisableChannel(const uint8_t Channel) + { + #if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \ + defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \ + defined(__AVR_ATmega32U6__)) + DDRF &= ~(1 << Channel); + DIDR0 &= ~(1 << Channel); + #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) + if (Channel < 8) + { + DDRF &= ~(1 << Channel); + DIDR0 &= ~(1 << Channel); + } + else if (Channel == 8) + { + DDRD &= ~(1 << 4); + DIDR2 &= ~(1 << 0); + } + else if (Channel < 11) + { + DDRD &= ~(1 << (Channel - 3)); + DIDR2 &= ~(1 << (Channel - 8)); + } + else + { + DDRB &= ~(1 << (Channel - 7)); + DIDR2 &= ~(1 << (Channel - 8)); + } + #endif + } + /** Starts the reading of the given channel, but does not wait until the conversion has completed. * Once executed, the conversion status can be determined via the \ref ADC_IsReadingComplete() macro and * the result read via the \ref ADC_GetResult() macro. -- cgit v1.2.3