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Merge pull request #20 from adafruit/mosi_fix 

adding check for _mosi== -1
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siddacious 2020-04-20 17:21:27 -07:00 committed by GitHub
parent 4cf47a3fef be95f9da0b
commit f9b3c37ed3
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 2 deletions
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9
Adafruit_SPIDevice.cpp
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@ -124,7 +124,9 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
for (int b = 7; b >= 0; b--) {
reply <<= 1;
if (_dataMode == SPI_MODE0) {
digitalWrite(_mosi, send & (1 << b));
if (_mosi != -1) {
digitalWrite(_mosi, send & (1 << b));
}
digitalWrite(_sck, HIGH);
if ((_miso != -1) && digitalRead(_miso)) {
reply |= 1;
@ -133,13 +135,16 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
}
if (_dataMode == SPI_MODE1) {
digitalWrite(_sck, HIGH);
digitalWrite(_mosi, send & (1 << b));
if (_mosi != -1) {
digitalWrite(_mosi, send & (1 << b));
}
digitalWrite(_sck, LOW);
if ((_miso != -1) && digitalRead(_miso)) {
reply |= 1;
}
}
}
// Serial.print(" : 0x"); Serial.print(reply, HEX);
if (_dataOrder == SPI_BITORDER_LSBFIRST) {
// LSB is rare, if it happens we'll just flip the bits around for them