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Update LiquidCrystal_I2C.cpp

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Ensure that pipelined I/O requests complete before the next one is set up.
This commit is contained in:
Neil McKechnie 2023-02-22 21:06:39 +00:00
parent 4eb277f19e
commit 4deb323802
1 changed files with 3 additions and 0 deletions
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3
LiquidCrystal_I2C.cpp
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@ -194,6 +194,7 @@ void LiquidCrystal_I2C::send(uint8_t value, uint8_t mode) {
uint8_t lownib = ((value & 0x0f) << BACKPACK_DATA_BITS) | mode;
// Send both nibbles
uint8_t len = 0;
rb.wait();
outputBuffer[len++] = highnib|En;
outputBuffer[len++] = highnib;
outputBuffer[len++] = lownib|En;
@ -208,6 +209,7 @@ void LiquidCrystal_I2C::write4bits(uint8_t value) {
// I2C clock cycle time of 2.5us at 400kHz. Data is clocked in to the
// HD44780 on the trailing edge of the Enable pin.
uint8_t len = 0;
rb.wait();
outputBuffer[len++] = _data|En;
outputBuffer[len++] = _data;
I2CManager.write(_Addr, outputBuffer, len, &rb); // Write command asynchronously
@ -216,6 +218,7 @@ void LiquidCrystal_I2C::write4bits(uint8_t value) {
// write a byte to the PCF8574 I2C interface. We don't need to set
// the enable pin for this.
void LiquidCrystal_I2C::expanderWrite(uint8_t value) {
rb.wait();
outputBuffer[0] = value | _backlightval;
I2CManager.write(_Addr, outputBuffer, 1, &rb); // Write command asynchronously
}