8000 Wire: if we are reading only one byte, do not send empty read command · maxosprojects/arduino-esp32@04e0902 · GitHub
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Wire: if we are reading only one byte, do not send empty read command
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+11
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‎cores/esp32/esp32-hal-i2c.c

Lines changed: 11 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -267,9 +267,17 @@ i2c_err_t i2cRead(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data
267267
i2cResetFiFo(i2c);
268268
}
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270-
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_READ, willRead, false, false, false);
271-
if((len - willRead) > 1) {
272-
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_END, 0, false, false, false);
270+
if(willRead){
271+
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_READ, willRead, false, false, false);
272+
if((len - willRead) > 1) {
273+
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_END, 0, false, false, false);
274+
} else {
275+
willRead++;
276+
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_READ, 1, true, false, false);
277+
if(sendStop) {
278+
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_STOP, 0, false, false, false);
279+
}
280+
}
273281
} else {
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willRead++;
275283
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_READ, 1, true, false, false);

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