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possible implementation for MCP23S

This commit is contained in:
lady ada 2021-06-24 13:24:04 -04:00
parent 4b4f880e4f
commit 3b9b0e6a2c
2 changed files with 30 additions and 1 deletions
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21
Adafruit_BusIO_Register.cpp
View File

@ -101,6 +101,17 @@ bool Adafruit_BusIO_Register::write(uint8_t *buffer, uint8_t len) {
return _i2cdevice->write(buffer, len, true, addrbuffer, _addrwidth);
}
if (_spidevice) {
if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
// very special case!
// pass the special opcode address which we set as the high byte of the regaddr
addrbuffer[0] = (uint8_t)(_address >> 8) & ~0x01; // set bottom bit low to write
// the 'actual' reg addr is the second byte then
addrbuffer[1] = (uint8_t)(_address & 0xFF);
// the address appears to be a byte longer
return _spidevice->write(buffer, len, addrbuffer, _addrwidth+1);
}
if (_spiregtype == ADDRBIT8_HIGH_TOREAD) {
addrbuffer[0] &= ~0x80;
}
@ -190,6 +201,16 @@ bool Adafruit_BusIO_Register::read(uint8_t *buffer, uint8_t len) {
return _i2cdevice->write_then_read(addrbuffer, _addrwidth, buffer, len);
}
if (_spidevice) {
if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
// very special case!
// pass the special opcode address which we set as the high byte of the regaddr
addrbuffer[0] = (uint8_t)(_address >> 8) | 0x01; // set bottom bit high to read
// the 'actual' reg addr is the second byte then
addrbuffer[1] = (uint8_t)(_address & 0xFF);
// the address appears to be a byte longer
return _spidevice->write(buffer, len, addrbuffer, _addrwidth+1);
}
if (_spiregtype == ADDRBIT8_HIGH_TOREAD) {
addrbuffer[0] |= 0x80;
}

10
Adafruit_BusIO_Register.h
View File

@ -15,13 +15,21 @@ typedef enum _Adafruit_BusIO_SPIRegType {
*/
AD8_HIGH_TOREAD_AD7_HIGH_TOINC = 1,
ADDRBIT8_HIGH_TOWRITE = 2,
/*!<
* ADDRBIT8_HIGH_TOWRITE
* When writing to a register you must actually send the value 0x80 +
* the register address to the device. e.g. To write to the register 0x19 the
* register value 0x99 is sent and to read 0x19 is sent.
*/
ADDRBIT8_HIGH_TOWRITE = 2,
/*!<
* ADDRESSED_OPCODE_LOWBIT_TO_WRITE
* Used by the MCP23S series, we send 0x40 |'rd with the opcode
* Then set the lowest bit to write
*/
ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE = 3,
} Adafruit_BusIO_SPIRegType;
/*!