Simplify split_common Code significantly (#4772)

* Eliminate separate slave loop

Both master and slave run the standard keyboard_task main loop now.

* Refactor i2c/serial specific code

Simplify some of the preprocessor mess by using common function names.

* Fix missing #endif

* Move direct pin mapping support from miniaxe to split_common

For boards with more pins than sense--sorry, switches.

* Reordering and reformatting only

* Don't run matrix_scan_quantum on slave side

* Clean up the offset/slaveOffset calculations

* Cut undebounced matrix size in half

* Refactor debouncing

* Minor fixups

* Split split_common transport and debounce code into their own files

Can now be replaced with custom versions per keyboard using
CUSTOM_TRANSPORT = yes and CUSTOM_DEBOUNCE = yes

* Refactor debounce for non-split keyboards too

* Update handwired/xealous to build using new split_common

* Fix debounce breaking basic test

* Dodgy method to allow a split kb to only include one of i2c/serial

SPLIT_TRANSPORT = serial or SPLIT_TRANSPORT = i2c will include only
that driver code in the binary.

SPLIT_TRANSPORT = custom (or anything else) will include neither, the
keyboard must supply it's own code

if SPLIT_TRANSPORT is not defined then the original behaviour (include
both avr i2c and serial code) is maintained.

This could be better but it would require explicitly updating all the
existing split keyboards.

* Enable LTO to get lets_split/sockets under the line

* Add docs for SPLIT_TRANSPORT, CUSTOM_MATRIX, CUSTOM_DEBOUNCE

* Remove avr-specific sei() from split matrix_setup

Not needed now that slave doesn't have a separate main loop.
Both sides (on avr) call sei() in lufa's main() after exiting
keyboard_setup().

* Fix QUANTUM_LIB_SRC references and simplify SPLIT_TRANSPORT.

* Add comments and fix formatting.

1 files changed, 224 insertions, 0 deletions

diff --git a/quantum/split_common/transport.c b/quantum/split_common/transport.c
new file mode 100644
index 000000000..95738530e
--- /dev/null
+++ b/quantum/split_common/transport.c
@@ -0,0 +1,224 @@
+
+#include "config.h"
+#include "matrix.h"
+#include "quantum.h"
+
+#define ROWS_PER_HAND (MATRIX_ROWS/2)
+
+#ifdef RGBLIGHT_ENABLE
+#   include "rgblight.h"
+#endif
+
+#ifdef BACKLIGHT_ENABLE
+# include "backlight.h"
+  extern backlight_config_t backlight_config;
+#endif
+
+#if defined(USE_I2C) || defined(EH)
+
+#include "i2c.h"
+
+#ifndef SLAVE_I2C_ADDRESS
+#  define SLAVE_I2C_ADDRESS           0x32
+#endif
+
+#if (MATRIX_COLS > 8)
+#  error "Currently only supports 8 COLS"
+#endif
+
+// Get rows from other half over i2c
+bool transport_master(matrix_row_t matrix[]) {
+  int err = 0;
+
+  // write backlight info
+#ifdef BACKLIGHT_ENABLE
+  if (BACKLIT_DIRTY) {
+    err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
+    if (err) { goto i2c_error; }
+
+    // Backlight location
+    err = i2c_master_write(I2C_BACKLIT_START);
+    if (err) { goto i2c_error; }
+
+    // Write backlight
+    i2c_master_write(get_backlight_level());
+
+    BACKLIT_DIRTY = false;
+  }
+#endif
+
+  err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
+  if (err) { goto i2c_error; }
+
+  // start of matrix stored at I2C_KEYMAP_START
+  err = i2c_master_write(I2C_KEYMAP_START);
+  if (err) { goto i2c_error; }
+
+  // Start read
+  err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
+  if (err) { goto i2c_error; }
+
+  if (!err) {
+    int i;
+    for (i = 0; i < ROWS_PER_HAND-1; ++i) {
+      matrix[i] = i2c_master_read(I2C_ACK);
+    }
+    matrix[i] = i2c_master_read(I2C_NACK);
+    i2c_master_stop();
+  } else {
+i2c_error: // the cable is disconnceted, or something else went wrong
+    i2c_reset_state();
+    return false;
+  }
+
+#ifdef RGBLIGHT_ENABLE
+  if (RGB_DIRTY) {
+    err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
+    if (err) { goto i2c_error; }
+
+    // RGB Location
+    err = i2c_master_write(I2C_RGB_START);
+    if (err) { goto i2c_error; }
+
+    uint32_t dword = eeconfig_read_rgblight();
+
+    // Write RGB
+    err = i2c_master_write_data(&dword, 4);
+    if (err) { goto i2c_error; }
+
+    RGB_DIRTY = false;
+    i2c_master_stop();
+  }
+#endif
+
+  return true;
+}
+
+void transport_slave(matrix_row_t matrix[]) {
+
+  for (int i = 0; i < ROWS_PER_HAND; ++i)
+  {
+    i2c_slave_buffer[I2C_KEYMAP_START + i] = matrix[i];
+  }
+  // Read Backlight Info
+  #ifdef BACKLIGHT_ENABLE
+  if (BACKLIT_DIRTY)
+  {
+    backlight_set(i2c_slave_buffer[I2C_BACKLIT_START]);
+    BACKLIT_DIRTY = false;
+  }
+  #endif
+  #ifdef RGBLIGHT_ENABLE
+  if (RGB_DIRTY)
+  {
+    // Disable interupts (RGB data is big)
+    cli();
+    // Create new DWORD for RGB data
+    uint32_t dword;
+
+    // Fill the new DWORD with the data that was sent over
+    uint8_t * dword_dat = (uint8_t *)(&dword);
+    for (int i = 0; i < 4; i++)
+    {
+      dword_dat[i] = i2c_slave_buffer[I2C_RGB_START + i];
+    }
+
+    // Update the RGB now with the new data and set RGB_DIRTY to false
+    rgblight_update_dword(dword);
+    RGB_DIRTY = false;
+    // Re-enable interupts now that RGB is set
+    sei();
+  }
+  #endif
+}
+
+void transport_master_init(void) {
+  i2c_master_init();
+}
+
+void transport_slave_init(void) {
+  i2c_slave_init(SLAVE_I2C_ADDRESS);
+}
+
+#else // USE_SERIAL
+
+#include "serial.h"
+
+typedef struct _Serial_s2m_buffer_t {
+  // TODO: if MATRIX_COLS > 8 change to uint8_t packed_matrix[] for pack/unpack
+  matrix_row_t smatrix[ROWS_PER_HAND];
+} Serial_s2m_buffer_t;
+
+typedef struct _Serial_m2s_buffer_t {
+#ifdef BACKLIGHT_ENABLE
+    uint8_t backlight_level;
+#endif
+#if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_SPLIT)
+    rgblight_config_t rgblight_config; //not yet use
+    //
+    // When MCUs on both sides drive their respective RGB LED chains,
+    // it is necessary to synchronize, so it is necessary to communicate RGB information.
+    // In that case, define the RGBLIGHT_SPLIT macro.
+    //
+    // Otherwise, if the master side MCU drives both sides RGB LED chains,
+    // there is no need to communicate.
+#endif
+} Serial_m2s_buffer_t;
+
+volatile Serial_s2m_buffer_t serial_s2m_buffer = {};
+volatile Serial_m2s_buffer_t serial_m2s_buffer = {};
+uint8_t volatile status0 = 0;
+
+SSTD_t transactions[] = {
+  { (uint8_t *)&status0,
+    sizeof(serial_m2s_buffer), (uint8_t *)&serial_m2s_buffer,
+    sizeof(serial_s2m_buffer), (uint8_t *)&serial_s2m_buffer
+  }
+};
+
+void transport_master_init(void)
+{ soft_serial_initiator_init(transactions, TID_LIMIT(transactions)); }
+
+void transport_slave_init(void)
+{ soft_serial_target_init(transactions, TID_LIMIT(transactions)); }
+
+bool transport_master(matrix_row_t matrix[]) {
+
+  if (soft_serial_transaction()) {
+    return false;
+  }
+
+  // TODO:  if MATRIX_COLS > 8 change to unpack()
+  for (int i = 0; i < ROWS_PER_HAND; ++i) {
+    matrix[i] = serial_s2m_buffer.smatrix[i];
+  }
+
+  #if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_SPLIT)
+    // Code to send RGB over serial goes here (not implemented yet)
+  #endif
+
+  #ifdef BACKLIGHT_ENABLE
+    // Write backlight level for slave to read
+    serial_m2s_buffer.backlight_level = backlight_config.enable ? backlight_config.level : 0;
+  #endif
+
+  return true;
+}
+
+void transport_slave(matrix_row_t matrix[]) {
+
+  // TODO: if MATRIX_COLS > 8 change to pack()
+  for (int i = 0; i < ROWS_PER_HAND; ++i)
+  {
+    serial_s2m_buffer.smatrix[i] = matrix[i];
+  }
+  #ifdef BACKLIGHT_ENABLE
+    backlight_set(serial_m2s_buffer.backlight_level);
+  #endif
+  #if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_SPLIT)
+  // Add serial implementation for RGB here
+  #endif
+
+}
+
+#endif