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Set clock polarity in software SPI implementations #1224

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Set clock polarity in software SPI implementations #1224

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17 changes: 17 additions & 0 deletions cppsrc/U8x8lib.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -392,6 +392,7 @@ extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uin
uint8_t i, b;
uint8_t *data;
uint8_t takeover_edge = u8x8_GetSPIClockPhase(u8x8);
uint8_t clock_polarity = u8x8_GetSPIClockPolarity(u8x8);
//uint8_t not_takeover_edge = 1 - takeover_edge;

/* the following static vars are recalculated in U8X8_MSG_BYTE_START_TRANSFER */
Expand Down Expand Up @@ -431,6 +432,9 @@ extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uin
*arduino_clock_port |= arduino_clock_mask;
*arduino_clock_port &= arduino_clock_n_mask;
}
if (clock_polarity == 1) {
*arduino_clock_port |= arduino_clock_mask;
}
}
else
#endif
Expand All @@ -446,6 +450,9 @@ extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uin
b <<= 1;
*arduino_clock_port &= arduino_clock_n_mask;
}
if (clock_polarity == 1) {
*arduino_clock_port |= arduino_clock_mask;
}
}
SREG = SREG_backup;
}
Expand All @@ -468,6 +475,9 @@ extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uin
*arduino_clock_port &= arduino_clock_n_mask;
*arduino_clock_port |= arduino_clock_mask;
}
if (clock_polarity == 1) {
*arduino_clock_port |= arduino_clock_mask;
}
}
else
#endif
Expand All @@ -483,6 +493,9 @@ extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uin
b <<= 1;
*arduino_clock_port |= arduino_clock_mask;
}
if (clock_polarity == 1) {
*arduino_clock_port |= arduino_clock_mask;
}
}
SREG = SREG_backup;
}
Expand Down Expand Up @@ -517,6 +530,10 @@ extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uin
arduino_data_port = portOutputRegister(digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_DATA]));
arduino_data_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_DATA]);
arduino_data_n_mask = ~arduino_data_mask;

if (clock_polarity == 1) {
*arduino_clock_port |= arduino_clock_mask;
}

break;
case U8X8_MSG_BYTE_END_TRANSFER:
Expand Down