@@ -13,14 +13,14 @@ AVR port classes do not need a similar class because PORTx is global in the Ardu | |||
Instantiation | |||
------------ | |||
Example PortIOE::ADDR initilization: | |||
const uint8_t PortIOE::ADDR = 0x18; | |||
Be careful with the ADDR. | |||
Example PortIOE::DEVICE_ADDR initilization: | |||
const uint8_t PortIOE::DEVICE_ADDR = 0x18; | |||
Be careful with the DEVICE_ADDR. | |||
Table 6 in PCA9655E datasheet lists 8-bit versions of I2C addresses. | |||
The Arduino Wire library uses 7-bit addresses throughout, so drop the low bit. | |||
For example, I2C address with AD2=GND AD1=SCL AD0=SCL, | |||
Table 6 lists 8-bit ADDR = 0x30 (b 00110000) | |||
while Arduino uses 7-bit ADDR = 0x18 (b 00011000) | |||
Table 6 lists 8-bit DEVICE_ADDR = 0x30 (b 00110000) | |||
while Arduino uses 7-bit DEVICE_ADDR = 0x18 (b 00011000) | |||
http://playground.arduino.cc/Main/WireLibraryDetailedReference | |||
The PCA9655E data sheet is on http://www.onsemi.com/pub_link/Collateral/PCA9655E-D.PDF | |||
@@ -39,7 +39,7 @@ Example instantiation for portB with active high rows on pins 0,1,2: | |||
*/ | |||
struct PortIOE | |||
{ | |||
static const uint8_t ADDR; //I2C address | |||
static const uint8_t DEVICE_ADDR; | |||
const uint8_t num; //port number | |||
uint8_t outputVal; //bitwise value of output register | |||
@@ -22,13 +22,13 @@ void PortRead_MCP23S17::begin(const uint8_t strobeOn) | |||
SPI.beginTransaction(SPISettings (SPI_CLOCK_DIV8, MSBFIRST, SPI_MODE0)); //control SPI bus todo is slow clock needed? | |||
digitalWrite(SS, LOW); //enable Slave Select | |||
SPI.transfer(port.ADDR << 1); //write command | |||
SPI.transfer(port.DEVICE_ADDR << 1); //write command | |||
SPI.transfer(port.num); //configure IODIR | |||
SPI.transfer(readPins); //0=output (for LED), 1=input (for read) | |||
digitalWrite(SS, LOW); //enable Slave Select | |||
digitalWrite(SS, HIGH); //disable Slave Select | |||
SPI.transfer(port.ADDR << 1); //write command | |||
SPI.transfer(port.DEVICE_ADDR << 1); //write command | |||
SPI.transfer(port.num + 0x0C); //configure GPPU | |||
SPI.transfer(pullUp); //0=pull-up disabled (for LED), 1=pull-up enabled (for read) | |||
digitalWrite(SS, HIGH); //disable Slave Select | |||
@@ -45,7 +45,7 @@ uint8_t PortRead_MCP23S17::read() | |||
uint8_t portState; //bit wise | |||
digitalWrite(SS, LOW); //enable Slave Select | |||
SPI.transfer(port.ADDR << 1 | 1); //read command | |||
SPI.transfer(port.DEVICE_ADDR << 1 | 1); //read command | |||
SPI.transfer(port.num + 0x12); //GPIO register address to read data from | |||
portState = SPI.transfer(0); //save the data (0 is dummy data to send) | |||
digitalWrite(SS, HIGH); //disable Slave Select |
@@ -10,7 +10,7 @@ PortRead_PCA9655E::PortRead_PCA9655E (PortIOE& port, const uint8_t readPins) | |||
void PortRead_PCA9655E::begin() | |||
{ | |||
Wire.beginTransmission(port.ADDR); | |||
Wire.beginTransmission(port.DEVICE_ADDR); | |||
Wire.write(configurationByteCommand); | |||
Wire.write(readPins); //0=configure as output (for LED), 1=configure as input (for read) | |||
Wire.endTransmission(); | |||
@@ -21,11 +21,11 @@ returns port value | |||
*/ | |||
uint8_t PortRead_PCA9655E::read() | |||
{ | |||
Wire.beginTransmission(port.ADDR); | |||
Wire.beginTransmission(port.DEVICE_ADDR); | |||
Wire.write(inputByteCommand); //input immediately before requestFrom | |||
Wire.endTransmission(false); //PCA9655E needs false to send a restart | |||
Wire.requestFrom(port.ADDR, 1u); //request one byte from input port | |||
Wire.requestFrom(port.DEVICE_ADDR, 1u); //request one byte from input port | |||
return Wire.read(); | |||
} |
@@ -5,7 +5,7 @@ | |||
void PortWrite_MCP23S17::writePort(const uint8_t registerAddr, const uint8_t data) | |||
{ | |||
digitalWrite(SS, LOW); //enable Slave Select | |||
SPI.transfer(port.ADDR << 1); //write command | |||
SPI.transfer(port.DEVICE_ADDR << 1); //write command | |||
SPI.transfer(registerAddr); //register address to write data to | |||
SPI.transfer(data); //data | |||
digitalWrite(SS, HIGH); //disable Slave Select |
@@ -12,7 +12,7 @@ Otherwise readPins could be overwritten. | |||
*/ | |||
void PortWrite_PCA9655E::begin() | |||
{ | |||
Wire.beginTransmission(port.ADDR); | |||
Wire.beginTransmission(port.DEVICE_ADDR); | |||
Wire.write(configurationByteCommand); | |||
Wire.write(0); //0=configure as output (for strobe pins and LED) | |||
Wire.endTransmission(); | |||
@@ -35,7 +35,7 @@ void PortWrite_PCA9655E::write(const uint8_t pin, const bool value) | |||
port.outputVal |= pin; //set pin output to high | |||
} | |||
Wire.beginTransmission(port.ADDR); | |||
Wire.beginTransmission(port.DEVICE_ADDR); | |||
Wire.write(outputByteCommand); | |||
Wire.write(port.outputVal); | |||
Wire.endTransmission(); |
@@ -39,7 +39,7 @@ uint8_t readPins[] = {14, 15}; | |||
const bool Scanner_Port::STROBE_ON = HIGH; //active high | |||
const bool Scanner_Port::STROBE_OFF = LOW; | |||
const uint8_t PortIOE::ADDR = 0x18; | |||
const uint8_t PortIOE::DEVICE_ADDR = 0x18; | |||
// ------------------ PORT 1 ------------------- | |||
PortIOE port1_R(1, 0); |
@@ -14,7 +14,7 @@ http://arduino.stackexchange.com/questions/28792/reading-an-mcp23s17-i-o-expande | |||
const bool Scanner_Port::STROBE_ON = LOW; | |||
const bool Scanner_Port::STROBE_OFF = HIGH; | |||
const uint8_t PortIOE::ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins are grounded | |||
const uint8_t PortIOE::DEVICE_ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins are grounded | |||
PortIOE portB(1, 0); | |||
PortRead_MCP23S17 portBRead(portB, ~0); |
@@ -11,7 +11,7 @@ MCP23S17 on 3.3v does not output enough power to reliable light LEDs | |||
#include "PortIOE.h" | |||
#include "PortWrite_MCP23S17.h" | |||
const uint8_t PortIOE::ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins are grounded | |||
const uint8_t PortIOE::DEVICE_ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins are grounded | |||
PortIOE portA(0, 0); | |||
PortWrite_MCP23S17 portAWrite(portA); //PortAWrite needed for begin() |