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SPITFT: work with any SERCOM SPIs

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This commit is contained in:
Phillip Burgess 2019-05-03 11:36:29 -07:00
parent 85023ccbaf
commit a453d081b4
2 changed files with 45 additions and 6 deletions
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47
Adafruit_SPITFT.cpp
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@ -255,9 +255,16 @@ Adafruit_SPITFT::Adafruit_SPITFT(uint16_t w, uint16_t h, int8_t cs,
@param rst Arduino pin # for display reset (optional, display reset @param rst Arduino pin # for display reset (optional, display reset
can be tied to MCU reset, default of -1 means unused). can be tied to MCU reset, default of -1 means unused).
@return Adafruit_SPITFT object. @return Adafruit_SPITFT object.
@note Output pins are not initialized; application typically will @note Output pins are not initialized in constructor; application
need to call subclass' begin() function, which in turn calls typically will need to call subclass' begin() function, which
this library's initSPI() function to initialize pins. in turn calls this library's initSPI() function to initialize
pins. EXCEPT...if you have built your own SERCOM SPI peripheral
(calling the SPIClass constructor) rather than one of the
built-in SPI devices (e.g. &SPI, &SPI1 and so forth), you will
need to call the begin() function for your object as well as
pinPeripheral() for the MOSI, MISO and SCK pins to configure
GPIO manually. Do this BEFORE calling the display-specific
begin or init function. Unfortunate but unavoidable.
*/ */
Adafruit_SPITFT::Adafruit_SPITFT(uint16_t w, uint16_t h, SPIClass *spiClass, Adafruit_SPITFT::Adafruit_SPITFT(uint16_t w, uint16_t h, SPIClass *spiClass,
int8_t cs, int8_t dc, int8_t rst) : Adafruit_GFX(w, h), int8_t cs, int8_t dc, int8_t rst) : Adafruit_GFX(w, h),
@ -517,8 +524,40 @@ void Adafruit_SPITFT::initSPI(uint32_t freq) {
#else #else
hwspi._freq = freq; // Save freq value for later hwspi._freq = freq; // Save freq value for later
#endif #endif
// Call hwspi._spi->begin() ONLY if this is among the 'established'
// SPI interfaces in variant.h. For DIY roll-your-own SERCOM SPIs,
// begin() and pinPeripheral() calls MUST be made in one's calling
// code, BEFORE the screen-specific begin/init function is called.
// Reason for this is that SPI::begin() makes its own calls to
// pinPeripheral() based on g_APinDescription[n].ulPinType, which
// on non-established SPI interface pins will always be PIO_DIGITAL
// or similar, while we need PIO_SERCOM or PIO_SERCOM_ALT...it's
// highly unique between devices and variants for each pin or
// SERCOM so we can't make those calls ourselves here. And the SPI
// device needs to be set up before calling this because it's
// immediately followed with initialization commands. Blargh.
if(
#if SPI_INTERFACES_COUNT > 0
(hwspi._spi == &SPI)
#endif
#if SPI_INTERFACES_COUNT > 1
|| (hwspi._spi == &SPI1)
#endif
#if SPI_INTERFACES_COUNT > 2
|| (hwspi._spi == &SPI2)
#endif
#if SPI_INTERFACES_COUNT > 3
|| (hwspi._spi == &SPI3)
#endif
#if SPI_INTERFACES_COUNT > 4
|| (hwspi._spi == &SPI4)
#endif
#if SPI_INTERFACES_COUNT > 5
|| (hwspi._spi == &SPI5)
#endif
) {
hwspi._spi->begin(); hwspi._spi->begin();
}
} else if(connection == TFT_SOFT_SPI) { } else if(connection == TFT_SOFT_SPI) {
pinMode(swspi._mosi, OUTPUT); pinMode(swspi._mosi, OUTPUT);

2
library.properties
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@ -1,5 +1,5 @@
name=Adafruit GFX Library name=Adafruit GFX Library
version=1.4.11 version=1.4.12
author=Adafruit author=Adafruit
maintainer=Adafruit <info@adafruit.com> maintainer=Adafruit <info@adafruit.com>
sentence=Adafruit GFX graphics core library, this is the 'core' class that all our other graphics libraries derive from. sentence=Adafruit GFX graphics core library, this is the 'core' class that all our other graphics libraries derive from.