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change RowScanner_SPIShiftRegisters to work with active high or active low

tags/v0.5.0
wolfv6 7 years ago
parent
f5448b200a
commit
d5cbc3c58c
4 changed files with 31 additions and 16 deletions
Split View Show Diff Stats
  1. 6
    2
      examples/keybrd_shift_register/keybrd_shift_register.ino
  2. 5
    5
      src/RowScanner_PinsArray.h
  3. 2
    2
      src/RowScanner_SPIShiftRegisters.cpp
  4. 18
    7
      src/RowScanner_SPIShiftRegisters.h

+ 6
- 2
examples/keybrd_shift_register/keybrd_shift_register.ino View File

@@ -37,6 +37,10 @@ const bool RowScanner_PinsArray::STROBE_OFF = HIGH;

const uint8_t RowScanner_SPIShiftRegisters::SHIFT_LOAD = 10;

//active state of right matrix
const bool RowScanner_SPIShiftRegisters::STROBE_ON = LOW;
const bool RowScanner_SPIShiftRegisters::STROBE_OFF = HIGH;

Debug debug;

// ================= LEFT PINS =================
@@ -144,7 +148,7 @@ Key* ptrsKeys_R0[] = { &s_0, &s_z, &s_z, &s_z, &s_1, &s_z, &s_z, &s_z,
&s_4, &s_z, &s_z, &s_z, &s_5, &s_z, &s_z, &s_z,
&s_6, &s_z, &s_z, &s_z, &s_3, &s_4, &s_5, &s_6 };
const uint8_t KEY_R0_COUNT = sizeof(ptrsKeys_R0)/sizeof(*ptrsKeys_R0);
Row_ShiftRegisters row_R0(8, ptrsKeys_R0, KEY_R0_COUNT);
Row_ShiftRegisters row_R0(0, ptrsKeys_R0, KEY_R0_COUNT);

//prints a b c d u v w x
Key* ptrsKeys_R1[] = { &s_a, &s_z, &s_z, &s_z, &s_b, &s_z, &s_z, &s_z,
@@ -152,7 +156,7 @@ Key* ptrsKeys_R1[] = { &s_a, &s_z, &s_z, &s_z, &s_b, &s_z, &s_z, &s_z,
&s_e, &s_z, &s_z, &s_z, &s_f, &s_z, &s_z, &s_z,
&s_g, &s_z, &s_z, &s_z, &s_u, &s_v, &s_w, &s_x };
const uint8_t KEY_R1_COUNT = sizeof(ptrsKeys_R1)/sizeof(*ptrsKeys_R1);
Row_ShiftRegisters row_R1(9, ptrsKeys_R1, KEY_R1_COUNT);
Row_ShiftRegisters row_R1(1, ptrsKeys_R1, KEY_R1_COUNT);

// ################### MAIN ####################
void setup()

+ 5
- 5
src/RowScanner_PinsArray.h View File

@@ -12,11 +12,11 @@ Constructor is in RowScanner_PinsArray.cpp
class RowScanner_PinsArray
{
private:
static const bool STROBE_ON; //logic level of strobe on, HIGH or LOW
static const bool STROBE_OFF; //logic level of strobe off, HIGH or LOW
const uint8_t STROBE_PIN; //Arduino pin number connected to this row
const uint8_t* const READ_PINS; //array of read pin numbers
const uint8_t READ_PIN_COUNT; //number of read pins
static const bool STROBE_ON; //logic level of strobe on, HIGH or LOW
static const bool STROBE_OFF; //logic level of strobe off, complement of STROBE_ON
const uint8_t STROBE_PIN; //Arduino pin number connected to this row
const uint8_t* const READ_PINS; //array of read pin numbers
const uint8_t READ_PIN_COUNT; //number of read pins
public:
RowScanner_PinsArray(const uint8_t STROBE_PIN,
const uint8_t READ_PINS[], const uint8_t READ_PIN_COUNT); //todo rename READ_PIN_COUNT to KEY_COUNT ??

+ 2
- 2
src/RowScanner_SPIShiftRegisters.cpp View File

@@ -23,7 +23,7 @@ read_pins_t RowScanner_SPIShiftRegisters::scan(uint8_t& keyCount)
read_pins_t rowState = 0;

//strobe row on
digitalWrite(STROBE_PIN, HIGH);
digitalWrite(STROBE_PIN, STROBE_ON);
delayMicroseconds(3); //time to stablize voltage

//read all the column pins
@@ -32,7 +32,7 @@ read_pins_t RowScanner_SPIShiftRegisters::scan(uint8_t& keyCount)
SPI.transfer(&rowState, BYTE_COUNT);

//strobe row off
digitalWrite(STROBE_PIN, LOW);
digitalWrite(STROBE_PIN, STROBE_OFF);

keyCount = KEY_COUNT;


+ 18
- 7
src/RowScanner_SPIShiftRegisters.h View File

@@ -8,20 +8,29 @@
#include <ColPort.h>

/* RowScanner_SPIShiftRegisters reads shift registers.
shift registers 74HC165 Parallel-In-Serial-Out (PISO)
shift registers 74HC165 is Parallel-In-Serial-Out (PISO)
Upto 4 shift registers can be in a daisy chained.

in sketch:
In sketch:
const uint8_t RowScanner_SPIShiftRegisters::SHIFT_LOAD = 10;
call begin() from setup()

Upto 4 shift registers can be in a daisy chained.
For active low:
const bool RowScanner_SPIShiftRegisters::STROBE_ON = LOW;
const bool RowScanner_SPIShiftRegisters::STROBE_OFF = HIGH;
//shift register parallel input pins have 10k pull-down resistors powered
//controller's MISO pin is connected to shift register's complementary serial output (/QH) pin

The shift registers are active high:
10k pull-down resistors are grounded
connect controller's MISO pin to shift register's QH pin
For active high:
const bool RowScanner_SPIShiftRegisters::STROBE_ON = HIGH;
const bool RowScanner_SPIShiftRegisters::STROBE_OFF = LOW;
//shift register parallel input pins have 10k pull-down resistors grounded
//controller's MISO pin is connected to shift register's serial output (QH) pin

The shift register needs 5 wires.
In addition, each row needs to be connected to a strobe pin from controller.

todo move this to tutorial
The shift register needs 5 wires.
The two parts of a split keyboard can be connected by one of:
* eSATA cable (has 7 wires, good for 2 rows)
* Ethernet cable (has 8 wires, good for 3 rows)
@@ -31,6 +40,8 @@ class RowScanner_SPIShiftRegisters
{
private:
static const uint8_t SHIFT_LOAD; //controller's pin number that is connected to shift register's SHIFT_LOAD pin
static const bool STROBE_ON; //logic level of strobe on, active state HIGH or LOW
static const bool STROBE_OFF; //logic level of strobe off, complement of active state
const uint8_t STROBE_PIN; //Arduino pin number connected to this row
const uint8_t BYTE_COUNT; //number of bytes to read from shift registers
uint8_t KEY_COUNT;