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mcp23017: read output latch registers during setup (#3744)
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84bac8356a
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5 changed files with 18 additions and 0 deletions
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@ -14,6 +14,9 @@ void MCP23008::setup() {
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return;
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}
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// Read current output register state
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this->read_reg(mcp23x08_base::MCP23X08_OLAT, &this->olat_);
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if (this->open_drain_ints_) {
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// enable open-drain interrupt pins, 3.3V-safe
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this->write_reg(mcp23x08_base::MCP23X08_IOCON, 0x04);
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@ -15,6 +15,10 @@ void MCP23016::setup() {
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return;
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}
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// Read current output register state
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this->read_reg_(MCP23016_OLAT0, &this->olat_0_);
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this->read_reg_(MCP23016_OLAT1, &this->olat_1_);
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// all pins input
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this->write_reg_(MCP23016_IODIR0, 0xFF);
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this->write_reg_(MCP23016_IODIR1, 0xFF);
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@ -14,6 +14,10 @@ void MCP23017::setup() {
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return;
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}
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// Read current output register state
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this->read_reg(mcp23x17_base::MCP23X17_OLATA, &this->olat_a_);
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this->read_reg(mcp23x17_base::MCP23X17_OLATB, &this->olat_b_);
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if (this->open_drain_ints_) {
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// enable open-drain interrupt pins, 3.3V-safe
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this->write_reg(mcp23x17_base::MCP23X17_IOCONA, 0x04);
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@ -23,6 +23,9 @@ void MCP23S08::setup() {
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this->transfer_byte(0b00011000); // Enable HAEN pins for addressing
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this->disable();
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// Read current output register state
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this->read_reg(mcp23x08_base::MCP23X08_OLAT, &this->olat_);
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if (this->open_drain_ints_) {
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// enable open-drain interrupt pins, 3.3V-safe
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this->write_reg(mcp23x08_base::MCP23X08_IOCON, 0x04);
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@ -23,6 +23,10 @@ void MCP23S17::setup() {
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this->transfer_byte(0b00011000); // Enable HAEN pins for addressing
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this->disable();
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// Read current output register state
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this->read_reg(mcp23x17_base::MCP23X17_OLATA, &this->olat_a_);
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this->read_reg(mcp23x17_base::MCP23X17_OLATB, &this->olat_b_);
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if (this->open_drain_ints_) {
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// enable open-drain interrupt pins, 3.3V-safe
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this->write_reg(mcp23x17_base::MCP23X17_IOCONA, 0x04);
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