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add refPortWrite.begin(strobeOn) to Scanner_IOE::begin(), update unit tests

tags/v0.6.0
wolfv6 7 years ago
parent
59565dacb4
commit
f24ea7aa76
6 changed files with 18 additions and 31 deletions
Unified View Show Diff Stats
  1. 3
    11
      src/PortMCP23S17.cpp
  2. 1
    3
      src/Scanner_IOE.cpp
  3. BIN
      tutorials/breadboard_keyboard_supplies.ods
  4. 0
    0
      unit_tests/PortMCP23S17_read/PortMCP23S17_bb.JPG
  5. 6
    7
      unit_tests/PortMCP23S17_read/PortMCP23S17_read.ino
  6. 8
    10
      unit_tests/PortMCP23S17_write/PortMCP23S17_write.ino

+ 3
- 11
src/PortMCP23S17.cpp View File

MCP23S17 SPI interface is 10 MHz max. MCP23S17 SPI interface is 10 MHz max.
The electrical limitation to bus speed is bus capacitance and the length of the wires involved. The electrical limitation to bus speed is bus capacitance and the length of the wires involved.
Longer wires require lower clock speeds. Longer wires require lower clock speeds.

begin() is called from Scanner_IOE::begin() twice, once each for refPortWrite and refPortRead.
The first 4 lines only need to be called once, but seem to work OK if called a second time.
*/ */
void PortMCP23S17::begin(const uint8_t strobeOn) void PortMCP23S17::begin(const uint8_t strobeOn)
{ {
{ {
pullUp = 0; pullUp = 0;
} }
//todo
Keyboard.print(" strobeOn="); Keyboard.print(strobeOn);
Keyboard.print(" readPins="); Keyboard.print(readPins, BIN);
Keyboard.print(" pullUp="); Keyboard.println(pullUp, BIN);


transfer(port.DEVICE_ADDR << 1, port.num, readPins); //configure IODIR transfer(port.DEVICE_ADDR << 1, port.num, readPins); //configure IODIR
transfer(port.DEVICE_ADDR << 1, port.num + 0x0C, pullUp); //configure GPPU transfer(port.DEVICE_ADDR << 1, port.num + 0x0C, pullUp); //configure GPPU
{ {
port.outputVal |= pin; //set pin output to high port.outputVal |= pin; //set pin output to high
} }
//todo
//Keyboard.print(" readPins="); Keyboard.print(readPins, BIN);
Keyboard.print(" pin="); Keyboard.print(pin, BIN);
Keyboard.print(" logicLevel="); Keyboard.print(logicLevel);
Keyboard.print(" outputVal="); Keyboard.println(port.outputVal, BIN);
//Keyboard.print(" ="); Keyboard.print();
//delay(200);


transfer(port.DEVICE_ADDR << 1, port.num + 0x12, port.outputVal); //set GPIO port to outputVal transfer(port.DEVICE_ADDR << 1, port.num + 0x12, port.outputVal); //set GPIO port to outputVal
} }

+ 1
- 3
src/Scanner_IOE.cpp View File

void Scanner_IOE::begin() void Scanner_IOE::begin()
{ {
refPortRead.begin(strobeOn); refPortRead.begin(strobeOn);
refPortWrite.begin(strobeOn);
} }


/* scan() is called on every iteration of sketch loop(). /* scan() is called on every iteration of sketch loop().
{ {
uint8_t readState; //bits, 1 means key is pressed, 0 means released uint8_t readState; //bits, 1 means key is pressed, 0 means released


delay(2000);//todo
//strobe on //strobe on
refPortWrite.write(strobePin, strobeOn); refPortWrite.write(strobePin, strobeOn);
delayMicroseconds(3); //time to stabilize voltage delayMicroseconds(3); //time to stabilize voltage
//delayMicroseconds(300); //todo


delay(2000);
//read the port pins //read the port pins
readState = refPortRead.read(); readState = refPortRead.read();



BIN
tutorials/breadboard_keyboard_supplies.ods View File


unit_tests/PortRead_MCP23S17/PortRead_MCP23S17_bb.JPG → unit_tests/PortMCP23S17_read/PortMCP23S17_bb.JPG View File


unit_tests/PortRead_MCP23S17/PortRead_MCP23S17.ino → unit_tests/PortMCP23S17_read/PortMCP23S17_read.ino View File

/* unit test for PortRead_MCP23S17
Picture of hardware is in unit_tests/PortRead_MCP23S17/PortRead_MCP23S17_bb.JPG
/* unit test for PortMCP23S17
Picture of hardware is in unit_tests/PortMCP23S17_read/PortMCP23S17_bb.JPG
The setup is an MCP23S17 I/O expander on a Teensy LC controller. The setup is an MCP23S17 I/O expander on a Teensy LC controller.
MCP23S17 port-B pins are alternately grounded and energized. MCP23S17 port-B pins are alternately grounded and energized.
portBState is a bitwise reading of port B. portBState is a bitwise reading of port B.
*/ */


#include "PortIOE.h" #include "PortIOE.h"
#include "PortRead_MCP23S17.h"
#include "Scanner_IOE.h"
#include "PortMCP23S17.h"


const uint8_t PortIOE::DEVICE_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);
PortIOE portB(1);


PortRead_MCP23S17 portBRead(portB, ~0);
PortMCP23S17 portBRead(portB, ~0);


void setup() void setup()
{ {
uint8_t portBState; //bit pattern uint8_t portBState; //bit pattern


delay(6000); delay(6000);
portBRead.begin(LOW);
portBRead.begin(HIGH); //HIGH or LOW, not matter


portBState = portBRead.read(); portBState = portBRead.read();
Keyboard.print("portBState = "); Keyboard.print("portBState = ");

unit_tests/PortWrite_MCP23S17/PortWrite_MCP23S17.ino → unit_tests/PortMCP23S17_write/PortMCP23S17_write.ino View File

/* unit test for PortWrite_MCP23S17
Picture of hardware is in unit_tests/PortRead_MCP23S17/PortRead_MCP23S17_bb.JPG
/* unit test for PortMCP23S17
Picture of hardware is in unit_tests/PortMCP23S17_read/PortMCP23S17_bb.JPG
The setup is an MCP23S17 I/O expander on a Teensy LC controller. The setup is an MCP23S17 I/O expander on a Teensy LC controller.
MCP23S17 port-A GPIO pins are not connected to anything. MCP23S17 port-A GPIO pins are not connected to anything.
Port-A GPIO-pin ouputs alternate between 0 and 3.3 volts. Port-A GPIO-pin ouputs alternate between 0 and 3.3 volts.


Use a volt meter to measure port-A GPIO-pin outputs. Use a volt meter to measure port-A GPIO-pin outputs.
MCP23S17 on 3.3v does not output enough power to reliable light LEDs
LED lights w/o resistor
LED not light with 56 ohm resistor
OR low-voltage LED, with forward voltage less than 2 volts.
*/ */
#include "PortIOE.h" #include "PortIOE.h"
#include "PortWrite_MCP23S17.h"
#include "PortMCP23S17.h"


const uint8_t PortIOE::DEVICE_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);
PortIOE portA(0);


PortWrite_MCP23S17 portAWrite(portA); //PortAWrite needed for begin()
PortMCP23S17 portAWrite(portA, 0); //PortAWrite needed for begin()


//const uint8_t GPIOA = 0x12; //LEDs are on port A //const uint8_t GPIOA = 0x12; //LEDs are on port A


void setup() void setup()
{ {
delay(6000); delay(6000);
portAWrite.begin();
//Keyboard.print("start blinking");
portAWrite.begin(LOW); //HIGH or LOW, not matter if readPins=0
Keyboard.print("start writing");
} }


void loop() void loop()