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Merge pull request #146 from adafruit/spi_bitbang_mode3 

Spi bitbang mode3
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Limor "Ladyada" Fried 2025-09-11 12:41:47 -04:00 committed by GitHub
parent e75ac29ca6 bd4135b50c
commit fccaf61a79
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GPG Key ID: B5690EEEBB952194
1 changed files with 54 additions and 50 deletions
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100
Adafruit_SPIDevice.cpp
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@ -2,6 +2,24 @@
// #define DEBUG_SERIAL Serial
#ifdef BUSIO_USE_FAST_PINIO
#define BUSIO_SET_CLOCK_LOW() (*clkPort = *clkPort & ~clkPinMask)
#define BUSIO_SET_CLOCK_HIGH() (*clkPort = *clkPort | clkPinMask)
#define BUSIO_READ_MISO() (*misoPort & misoPinMask)
#define BUSIO_WRITE_MOSI(value) \
do { \
if (value) \
*mosiPort = *mosiPort | mosiPinMask; \
else \
*mosiPort = *mosiPort & ~mosiPinMask; \
} while (0)
#else
#define BUSIO_SET_CLOCK_LOW() digitalWrite(_sck, LOW)
#define BUSIO_SET_CLOCK_HIGH() digitalWrite(_sck, HIGH)
#define BUSIO_READ_MISO() digitalRead(_miso)
#define BUSIO_WRITE_MOSI(value) digitalWrite(_mosi, value)
#endif
/*!
* @brief Create an SPI device with the given CS pin and settings
* @param cspin The arduino pin number to use for chip select
@ -181,86 +199,72 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) {
towrite = send & b;
if ((_mosi != -1) && (lastmosi != towrite)) {
#ifdef BUSIO_USE_FAST_PINIO
if (towrite)
*mosiPort = *mosiPort | mosiPinMask;
else
*mosiPort = *mosiPort & ~mosiPinMask;
#else
digitalWrite(_mosi, towrite);
#endif
BUSIO_WRITE_MOSI(towrite);
lastmosi = towrite;
}
#ifdef BUSIO_USE_FAST_PINIO
*clkPort = *clkPort | clkPinMask; // Clock high
#else
digitalWrite(_sck, HIGH);
#endif
BUSIO_SET_CLOCK_HIGH();
if (bitdelay_us) {
delayMicroseconds(bitdelay_us);
}
if (_miso != -1) {
#ifdef BUSIO_USE_FAST_PINIO
if (*misoPort & misoPinMask) {
#else
if (digitalRead(_miso)) {
#endif
if (BUSIO_READ_MISO())
reply |= b;
}
BUSIO_SET_CLOCK_LOW();
} else if (_dataMode == SPI_MODE3) {
if (_mosi != -1) { // transmit on falling edge
BUSIO_WRITE_MOSI(send & b);
}
BUSIO_SET_CLOCK_LOW();
if (bitdelay_us) {
delayMicroseconds(bitdelay_us);
}
BUSIO_SET_CLOCK_HIGH();
if (bitdelay_us) {
delayMicroseconds(bitdelay_us);
}
if (_miso != -1) { // read on rising edge
if (BUSIO_READ_MISO()) {
reply |= b;
}
}
#ifdef BUSIO_USE_FAST_PINIO
*clkPort = *clkPort & ~clkPinMask; // Clock low
#else
digitalWrite(_sck, LOW);
#endif
} else { // if (_dataMode == SPI_MODE1 || _dataMode == SPI_MODE3)
} else { // || _dataMode == SPI_MODE1)
#ifdef BUSIO_USE_FAST_PINIO
*clkPort = *clkPort | clkPinMask; // Clock high
#else
digitalWrite(_sck, HIGH);
#endif
BUSIO_SET_CLOCK_HIGH();
if (bitdelay_us) {
delayMicroseconds(bitdelay_us);
}
if (_mosi != -1) {
#ifdef BUSIO_USE_FAST_PINIO
if (send & b)
*mosiPort = *mosiPort | mosiPinMask;
else
*mosiPort = *mosiPort & ~mosiPinMask;
#else
digitalWrite(_mosi, send & b);
#endif
BUSIO_WRITE_MOSI(send & b);
}
#ifdef BUSIO_USE_FAST_PINIO
*clkPort = *clkPort & ~clkPinMask; // Clock low
#else
digitalWrite(_sck, LOW);
#endif
BUSIO_SET_CLOCK_LOW();
if (_miso != -1) {
#ifdef BUSIO_USE_FAST_PINIO
if (*misoPort & misoPinMask) {
#else
if (digitalRead(_miso)) {
#endif
if (BUSIO_READ_MISO()) {
reply |= b;
}
}
}
}
if (_miso != -1) {
buffer[i] = reply;
}
}
}
return;
}