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esp32_Adafruit_BusIO
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add some delays to slow down fast bitbang on demand

This commit is contained in:
lady ada 2020-07-18 18:40:45 -04:00
parent 3ab09b4a46
commit e7fff533a3
1 changed files with 14 additions and 0 deletions
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14
Adafruit_SPIDevice.cpp
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@ -124,6 +124,7 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
} }
bool towrite, lastmosi = !(buffer[0] & startbit); bool towrite, lastmosi = !(buffer[0] & startbit);
uint8_t bitdelay_us = (1000000 / _freq) / 2;
// for softSPI we'll do it by hand // for softSPI we'll do it by hand
for (size_t i = 0; i < len; i++) { for (size_t i = 0; i < len; i++) {
@ -140,6 +141,11 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
// Serial.print(send, HEX); // Serial.print(send, HEX);
for (uint8_t b = startbit; b != 0; for (uint8_t b = startbit; b != 0;
b = (_dataOrder == SPI_BITORDER_LSBFIRST) ? b << 1 : b >> 1) { b = (_dataOrder == SPI_BITORDER_LSBFIRST) ? b << 1 : b >> 1) {
if (bitdelay_us) {
delayMicroseconds(bitdelay_us);
}
if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) { if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) {
towrite = send & b; towrite = send & b;
if ((_mosi != -1) && (lastmosi != towrite)) { if ((_mosi != -1) && (lastmosi != towrite)) {
@ -160,6 +166,10 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
digitalWrite(_sck, HIGH); digitalWrite(_sck, HIGH);
#endif #endif
if (bitdelay_us) {
delayMicroseconds(bitdelay_us);
}
if (_miso != -1) { if (_miso != -1) {
#ifdef BUSIO_USE_FAST_PINIO #ifdef BUSIO_USE_FAST_PINIO
if (*misoPort & misoPinMask) { if (*misoPort & misoPinMask) {
@ -183,6 +193,10 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
digitalWrite(_sck, HIGH); digitalWrite(_sck, HIGH);
#endif #endif
if (bitdelay_us) {
delayMicroseconds(bitdelay_us);
}
if (_mosi != -1) { if (_mosi != -1) {
#ifdef BUSIO_USE_FAST_PINIO #ifdef BUSIO_USE_FAST_PINIO
if (send & b) if (send & b)