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esp32_Adafruit_BusIO
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simplifyi LSB/MSB handling for soft spi

This commit is contained in:
lady ada 2020-07-18 15:38:53 -04:00
parent 0b1dbbd0e4
commit 605d437891
1 changed files with 20 additions and 30 deletions
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50
Adafruit_SPIDevice.cpp
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@ -116,6 +116,17 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
return;
}
int8_t startbit, endbit, inc;
if (_dataOrder == SPI_BITORDER_LSBFIRST) {
startbit = 0;
endbit = 8;
inc = 1;
} else {
startbit = 7;
endbit = -1;
inc = -1;
}
// for softSPI we'll do it by hand
for (size_t i = 0; i < len; i++) {
// software SPI
@ -128,26 +139,17 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
Serial.print(" -> 0x");
*/
if (_dataOrder == SPI_BITORDER_LSBFIRST) {
// LSB is rare, if it happens we'll just flip the bits around for them
uint8_t temp = 0;
for (uint8_t b = 0; b < 8; b++) {
temp |= ((send >> b) & 0x1) << (7 - b);
}
send = temp;
}
// Serial.print(send, HEX);
for (int b = 7; b >= 0; b--) {
reply <<= 1;
for (int b = startbit; b != endbit; b += inc) {
if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) {
if (_mosi != -1) {
#ifdef BUSIO_USE_FAST_PINIO
digitalWrite(_mosi, send & (1 << b));
#else
if (send & (1 << b))
*mosiPort |= mosiPinMask;
else
*mosiPort &= ~mosiPinMask;
#else
digitalWrite(_mosi, send & (1 << b));
#endif
}
@ -163,7 +165,7 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
#else
if (digitalRead(_miso)) {
#endif
reply |= 1;
reply |= (1 << b);
}
}
@ -183,12 +185,12 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
if (_mosi != -1) {
#ifdef BUSIO_USE_FAST_PINIO
digitalWrite(_mosi, send & (1 << b));
#else
if (send & (1 << b))
*mosiPort |= mosiPinMask;
else
*mosiPort &= ~mosiPinMask;
#else
digitalWrite(_mosi, send & (1 << b));
#endif
}
@ -204,25 +206,13 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
#else
if (digitalRead(_miso)) {
#endif
reply |= 1;
reply |= (1 << b);
}
}
}
}
// Serial.print(" : 0x"); Serial.print(reply, HEX);
if (_miso != -1) {
if (_dataOrder == SPI_BITORDER_LSBFIRST) {
// LSB is rare, if it happens we'll just flip the bits around for them
uint8_t temp = 0;
for (uint8_t b = 0; b < 8; b++) {
temp |= ((reply >> b) & 0x1) << (7 - b);
}
reply = temp;
if (_miso != -1) {
buffer[i] = reply;
}
// Serial.print(" -> "); Serial.println(reply, HEX);
buffer[i] = reply;
}
}
return;