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msxmap.cpp
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msxmap.cpp
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/** @addtogroup 03 msxmap MSX Interface Translator
*
* @ingroup MSX_specific_definitions
*
* @file msxmap.cpp Get a PS/2 key, translates it, put in keyboard interface buffer, dispatch smooth type buffer and process MSX interrupt of reading colunms.
*
* @brief <b>Get a PS/2 key, translates it, put in keyboard interface buffer, dispatch smooth type buffer and process MSX interrupt of reading colunms.</b>
*
* @version 1.0.0
*
* @author @htmlonly © @endhtmlonly 2022
* Evandro Souza <evandro.r.souza@gmail.com>
*
* @date 25 September 2022
*
* This library executes functions to get a PS/2 key, translates it, put
* in keyboard interface buffer, dispatch smooth type buffer and process
* MSX interrupt of reading colunms on the STM32F4 and STM32F1 series of
* ARM Cortex Microcontrollers by ST Microelectronics.
*
* LGPL License Terms ref lgpl_license
*/
/*
* This file is part of the PS/2 to MSX Keyboard converter enviroment:
* PS/2 to MSX keyboard Converter and MSX Keyboard Subsystem Emulator
* designs, based on libopencm3 project.
*
* Copyright (C) 2022 Evandro Souza <evandro.r.souza@gmail.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
//Use Tab width=2
#include "msxmap.h"
#define MAX_TIME_OF_IDLE_KEYSCAN_SYSTICKS 4 //30 / 4 = 7.5 times per second is the maximum sweep speed
#define NIBBLE 4
#define CASE_MASK 0x03
#define CASEx_TYPE 3 //Relative position within a line of Case type
#define CASE0_KEY0 4 //Relative position within a line of first key of case 0
#define CASE0_KEY1 5 // " " " " " " second " " case 0
#define CASE1_KEY0 6 // " " " " " " first " " case 1
#define CASE1_KEY1 7 // " " " " " " second " " case 1
#define CASE2_KEY0 6 //Cases 1 and 2 share the same database positions as they don't overlap
#define CASE2_KEY1 7 //Cases 1 and 2 share the same database positions as they don't overlap
#define X_POLARITY_BIT_POSITION 3
#define X_POLARITY_BIT_MASK (1 << X_POLARITY_BIT_POSITION) //8
#define Y_LOCAL_MASK 0xF0//Mask of Y on press/release command byte
#define X_LOCAL_MASK 7 //Mask of X on press/release command byte
#define Y_SHIFT 6 //Shift colunm
#define X_SHIFT 0 //Shift line
#define MSX_SHIFT_PRESS (Y_SHIFT<<NIBBLE)|X_SHIFT//Shift press will be resolved as 0x60
#define Y_GRAPH 6 //Graph colunm
#define X_GRAPH 2 //Graph line
#define Y_CTRL 6 //CTRL colunm
#define X_CTRL 1 //CTRL line
#define Y_STOP 7 //Stop key colunm
#define X_STOP 4 //Stop key line
//Variáveis globais: Visíveis por todo o contexto do programa
uint8_t* base_of_database;
extern uint32_t systicks; //Declared on sys_timer.cpp
extern bool ps2numlockstate; //Declared on ps2handl.c
bool do_next_keep_alive;
volatile bool shiftstate;
extern volatile bool update_ps2_leds; //Declared on ps2handl.c
volatile uint16_t linhavarrida;
//Place to store previous time for each Y last scan
volatile uint32_t previous_y_systick[ 16 ] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
//Variable used to store the values of the X for each Y scan - Each Y has its own image of BSSR register
uint32_t x_bits[ 16 ]; //All pins that interface with PORT B of 8255 must have high level as default
uint8_t y_dummy; //Read from MSX Database to sinalize "No keys mapping"
volatile uint32_t formerscancode;
volatile uint8_t scancode[4]; //scancode[0] stores the quantity of bytes;
uint8_t CtrlAltDel;
//First record of unused V.1.0 Database
uint8_t UNUSED_DATABASE[(uint8_t)DB_NUM_COLS] = {0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x04, 0x08};
extern bool enable_xon_xoff; //Declared on serial.c
#define DISPATCH_QUEUE_SIZE 16
uint8_t dispatch_keys_queue_buffer[DISPATCH_QUEUE_SIZE];
struct sring dispatch_keys_queue;
// Table to translate the Y order: From port read to the expected one:
const uint8_t Y_XLAT_TABLE[uint8_t(16)] = { 0b0000, 0b1000, 0b0100, 0b1100,
0b0010, 0b1010, 0b0110, 0b1110,
0b0001, 0b1001, 0b0101, 0b1101,
0b0011, 0b1011, 0b0111, 0b1111};
void msxmap::msx_interface_setup(void)
{
//Set Alternate function
#if MCU == STM32F401
gpio_set_af(Y0_PORT, GPIO_AF3, Y0_PIN | Y1_PIN | Y2_PIN | Y3_PIN);
gpio_set_af( X_PORT, GPIO_AF3, X0_PIN | X1_PIN | X2_PIN | X3_PIN | X4_PIN | X5_PIN | X6_PIN | X7_PIN);
#endif
//Not the STM32 default, but it is the default MSX state: Release MSX keys;
gpio_set(X_PORT,
X7_PIN | X6_PIN | X5_PIN | X4_PIN | X3_PIN | X2_PIN | X1_PIN | X0_PIN);
//Init output port B
//gpio_mode_setup(X7_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN,
//X7_PIN | X6_PIN | X5_PIN | X4_PIN | X3_PIN | X2_PIN | X1_PIN | X0_PIN);
#if MCU == STM32F103
gpio_set_mode(X7_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN,
X7_PIN | X6_PIN | X5_PIN | X4_PIN | X3_PIN | X2_PIN | X1_PIN | X0_PIN);
#endif //#if MCU == STM32F103
#if MCU == STM32F401
gpio_mode_setup(X_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP,
X7_PIN | X6_PIN | X5_PIN | X4_PIN | X3_PIN | X2_PIN | X1_PIN | X0_PIN);
gpio_set_output_options(X_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_100MHZ,
X7_PIN | X6_PIN | X5_PIN | X4_PIN | X3_PIN | X2_PIN | X1_PIN | X0_PIN);
#endif
//Init startup state of BSSR image to each Y scan
for(uint8_t i = 0; i < 16; i++)
x_bits[ i ] = X7_SET_OR | X6_SET_OR | X5_SET_OR | X4_SET_OR | X3_SET_OR | X2_SET_OR | X1_SET_OR | X0_SET_OR;
// Initialize dispatch_keys_queue ringbuffer
ring_init(&dispatch_keys_queue, dispatch_keys_queue_buffer, DISPATCH_QUEUE_SIZE);
for(uint16_t i=0; i<DISPATCH_QUEUE_SIZE; ++i)
dispatch_keys_queue.data[i]=0;
// GPIO pins for MSX keyboard Y scan (PC3:0 of the MSX 8255 - PC3 MSX 8255 Pin 17)
//gpio_set(Y3_PORT, Y3_PIN); //pull up resistor
#if MCU == STM32F103
gpio_set(Y3_PORT, Y3_PIN); //pull up resistor
gpio_set_mode(Y3_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, Y3_PIN); // PC3 (MSX 8255 Pin 17)
exti_select_source(Y3_exti, Y3_PORT);
exti_set_trigger(Y3_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y3_exti);
exti_enable_request(Y3_exti);
gpio_port_config_lock(Y3_PORT, Y3_PIN);
#endif //#if MCU == STM32F103
#if MCU == STM32F401
gpio_mode_setup(Y3_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, Y3_PIN); // PC3 (MSX 8255 Pin 17)
exti_select_source(Y3_exti, Y3_PORT);
exti_set_trigger(Y3_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y3_exti);
exti_enable_request(Y3_exti);
gpio_port_config_lock(Y3_PORT, Y3_PIN);
#endif
// GPIO pins for MSX keyboard Y scan (PC3:0 of the MSX 8255 - PC2 MSX 8255 Pin 16)
//gpio_set(Y2_PORT, Y2_PIN); //pull up resistor
#if MCU == STM32F103
gpio_set(Y2_PORT, Y2_PIN); //pull up resistor
gpio_set_mode(Y2_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, Y2_PIN); // PC2 (MSX 8255 Pin 16)
exti_select_source(Y2_exti, Y2_PORT);
exti_set_trigger(Y2_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y2_exti);
exti_enable_request(Y2_exti);
gpio_port_config_lock(Y2_PORT, Y2_PIN);
#endif //#if MCU == STM32F103
#if MCU == STM32F401
gpio_mode_setup(Y2_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, Y2_PIN); // PC2 (MSX 8255 Pin 16)
exti_select_source(Y2_exti, Y2_PORT);
exti_set_trigger(Y2_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y2_exti);
exti_enable_request(Y2_exti);
gpio_port_config_lock(Y2_PORT, Y2_PIN);
#endif
// GPIO pins for MSX keyboard Y scan (PC3:0 of the MSX 8255 - PC1 MSX 8255 Pin 15)
//gpio_set(Y1_PORT, Y1_PIN); //pull up resistor
#if MCU == STM32F103
gpio_set(Y1_PORT, Y1_PIN); //pull up resistor
gpio_set_mode(Y1_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, Y1_PIN); // PC1 (MSX 8255 Pin 15)
exti_select_source(Y1_exti, Y1_PORT);
exti_set_trigger(Y1_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y1_exti);
exti_enable_request(Y1_exti);
gpio_port_config_lock(Y1_PORT, Y1_PIN);
#endif //#if MCU == STM32F103
#if MCU == STM32F401
gpio_mode_setup(Y1_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, Y1_PIN); // PC1 (MSX 8255 Pin 15)
exti_select_source(Y1_exti, Y1_PORT);
exti_set_trigger(Y1_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y1_exti);
exti_enable_request(Y1_exti);
gpio_port_config_lock(Y1_PORT, Y1_PIN);
#endif
// GPIO pins for MSX keyboard Y scan (PC3:0 of the MSX 8255 - PC0 MSX 8255 Pin 14)
//gpio_set(Y0_PORT, Y0_PIN); //pull up resistor
#if MCU == STM32F103
gpio_set(Y0_PORT, Y0_PIN); //pull up resistor
gpio_set_mode(Y0_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, Y0_PIN); // PC0 (MSX 8255 Pin 14)
exti_select_source(Y0_exti, Y0_PORT);
exti_set_trigger(Y0_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y0_exti);
exti_enable_request(Y0_exti);
gpio_port_config_lock(Y0_PORT, Y0_PIN);
#endif //#if MCU == STM32F103
#if MCU == STM32F401
gpio_mode_setup(Y0_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, Y0_PIN); // PC0 (MSX 8255 Pin 14)
exti_select_source(Y0_exti, Y0_PORT);
exti_set_trigger(Y0_exti, EXTI_TRIGGER_BOTH); //Interrupt on change
exti_reset_request(Y0_exti);
exti_enable_request(Y0_exti);
gpio_port_config_lock(Y0_PORT, Y0_PIN);
#endif
// GPIO pins for MSX keyboard Y scan (PC3:0 of the MSX 8255 - PC0 MSX 8255 Pin 14),
// CAPS_LED and KANA/Cyrillic_LED (mapped to scroll lock) to replicate in PS/2 keyboard
// Set both to input and enable internal pullup
// CAPS_LED
#if MCU == STM32F103
gpio_set_mode(CAPSLOCK_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, CAPSLOCK_PIN); // CAP_LED (MSX 8255 Pin 11)
gpio_set(CAPSLOCK_PORT, CAPSLOCK_PIN); //pull up resistor
gpio_port_config_lock(CAPSLOCK_PORT, CAPSLOCK_PIN);
#endif //#if MCU == STM32F103
#if MCU == STM32F401
gpio_mode_setup(CAPSLOCK_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, CAPSLOCK_PIN); // CAP_LED (MSX 8255 Pin 11)
gpio_set(CAPSLOCK_PORT, CAPSLOCK_PIN); //pull up resistor
gpio_port_config_lock(CAPSLOCK_PORT, CAPSLOCK_PIN);
#endif
// Kana LED
#if MCU == STM32F103
gpio_set_mode(KANA_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, KANA_PIN); // KANA_LED - Mapeado para Scroll Lock
gpio_set(KANA_PORT, KANA_PIN); //pull up resistor
gpio_port_config_lock(KANA_PORT, KANA_PIN);
// Enable EXTI9_5 interrupt. (for Y - bits 0 and 1 - Pins PA8 and PA9)
nvic_enable_irq(NVIC_EXTI9_5_IRQ);
// Enable EXTI15_10 interrupt. (for Y - bits 2 and 3 - Pins PA11 and PA12)
nvic_enable_irq(NVIC_EXTI15_10_IRQ);
//Highest priority to avoid interrupt Y scan
nvic_set_priority(NVIC_EXTI9_5_IRQ, IRQ_PRI_Y_SCAN); //Y0 and Y1
nvic_set_priority(NVIC_EXTI15_10_IRQ, IRQ_PRI_Y_SCAN); //Y2 and Y3
#endif //#if MCU == STM32F103
#if MCU == STM32F401
gpio_mode_setup(KANA_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, KANA_PIN); // KANA_LED - Mapeado para Scroll Lock
gpio_set(KANA_PORT, KANA_PIN); //pull up resistor
gpio_port_config_lock(KANA_PORT, KANA_PIN);
// Enable EXTI9_5 interrupt. (for Y - bits 3 to 0)
nvic_enable_irq(NVIC_EXTI9_5_IRQ);
//Highest priority to avoid interrupt Y scan loss
nvic_set_priority(NVIC_EXTI9_5_IRQ, IRQ_PRI_Y_SCAN); //Y3 to Y0
#endif
#if MCU == STM32F401
DBGMCU_APB1_FZ = DBG_IWDG_STOP | DBG_WWDG_STOP
//Workaround here to stop iwdg, wwdg and TIMx counters during halt
#if TIM_HR == TIM2
| DBG_TIM2_STOP
#endif //#if TIM_HR == TIM2
#if TIM_HR == TIM3
| DBG_TIM3_STOP
#endif //#if TIM_HR == TIM3
#if TIM_HR == TIM4
| DBG_TIM4_STOP
#endif //#if TIM_HR == TIM4
#if TIM_HR == TIM5
| DBG_TIM5_STOP
#endif //#if TIM_HR == TIM5
;
#endif //#if MCU == STM32F401
}
// Verify if there is an available ps2_byte_received on the receive ring buffer, but does not fetch this one
//Input: void
//Output: True if there is char available in input buffer or False if none
bool msxmap::available_msx_disp_keys_queue_buffer(void)
{
uint8_t i = dispatch_keys_queue.get_ptr;
if(i == dispatch_keys_queue.put_ptr) //msx_dispatch_kq_put)
return false; //No char in buffer
else
return true;
}
// Fetches the next ps2_byte_received from the receive ring buffer
//Input: void
//Outut: Available byte read
uint8_t msxmap::get_msx_disp_keys_queue_buffer(void)
{
uint8_t i, result;
i = dispatch_keys_queue.get_ptr;
if(i == dispatch_keys_queue.put_ptr)
//No char in buffer
return 0;
result = dispatch_keys_queue.data[i];
i++;
dispatch_keys_queue.get_ptr = i & (uint8_t)(DISPATCH_QUEUE_SIZE- 1); //if(i) >= (uint16_t)DISPATCH_QUEUE_SIZE) i = 0;
return result;
}
/*Put a MSX Key (byte) into a buffer to get it mounted to x_bits
* Input: uint8_t as parameter
* Output: Total number of bytes in buffer, or ZERO if buffer was already full.*/
uint8_t msxmap::put_msx_disp_keys_queue_buffer(uint8_t data_word)
{
uint8_t i, i_next;
i = dispatch_keys_queue.put_ptr;
i_next = i + 1;
i_next &= (uint8_t)(DISPATCH_QUEUE_SIZE - 1);
if (i_next != dispatch_keys_queue.get_ptr)
{
dispatch_keys_queue_buffer[i] = data_word;
dispatch_keys_queue.put_ptr = i_next;
return (uint8_t)(DISPATCH_QUEUE_SIZE - dispatch_keys_queue.get_ptr + dispatch_keys_queue.put_ptr) & (uint8_t)(DISPATCH_QUEUE_SIZE - 1);
}
else
return 0;
}
//The objective of this routine is implement a smooth typing.
//The usage is to put a byte key (bit 7:4 represents Y, bit 3 is the release=1/press=0, bits 2:0 are the X )
//F = 15Hz. This routine is called from Ticks interrupt routine
void msxmap::msxqueuekeys(void)
{
uint8_t x_local, y_local, readkey;
bool x_local_setb;
if (available_msx_disp_keys_queue_buffer())
{
//This routine is allways called AFTER the mapped condition has been tested
readkey = get_msx_disp_keys_queue_buffer();
y_local = (readkey & Y_LOCAL_MASK) >> NIBBLE;
x_local = readkey & X_LOCAL_MASK;
x_local_setb = ((readkey & X_POLARITY_BIT_MASK) >> X_POLARITY_BIT_POSITION) == (uint8_t)1;
// Compute x_bits of ch and verifies when Y was last updated,
// with aim to update MSX keys, no matters if the MSX has the interrupts stucked.
compute_x_bits_and_check_interrupt_stuck(y_local, x_local, x_local_setb);
}
}
void msxmap::convert2msx()
{
switch(CtrlAltDel)
{
case 0:
{
//First state: No reset keys
if (
(scancode[0] == (uint8_t)1) &&
(scancode[1] == (uint8_t)0x14) ) //Left Control
CtrlAltDel = 1;
break;
}
case 1:
{
//Second state: Left Control
if (
(scancode[0] == (uint8_t)1) &&
(scancode[1] == (uint8_t)0x11) ) //Left Alt
//Left Control + Left Alt are pressed together
CtrlAltDel = 2;
else
CtrlAltDel = 0;
break;
}
case 2:
{
//Third state: Num Pad Del
if (
(scancode[0] == (uint8_t)1) &&
(scancode[1] == (uint8_t)0x71) ) //Num pad Del
{
//Left Control + Left Alt + Num Pad Del are pressed together
//User messages
con_send_string((uint8_t*)"Reset requested by user\r\n");
reset_requested();
}
else
CtrlAltDel = 0;
}
}
if (
(scancode[0] == (uint8_t)1) &&
(scancode[1] == (uint8_t)0x77) )
{
//NumLock Pressed. Toggle NumLock status
ps2numlockstate = !ps2numlockstate;
update_ps2_leds = true; //this will force update_leds at main loop
return;
}
if (
(scancode[0] == (uint8_t)2) &&
(scancode[1] == (uint8_t)0xF0) &&
(scancode[2] == (uint8_t)0x77) )
{
//NumLock Released. Return with no action
return;
}
if (
( scancode[0] == (uint8_t)1) &&
((scancode[1] == (uint8_t)0x12) || (scancode[1] == (uint8_t)0x59)) )
{
//Shift Pressed.
shiftstate = true;
}
if (
( scancode[0] == (uint8_t)2) &&
( scancode[1] == (uint8_t)0xF0) &&
((scancode[2] == (uint8_t)0x12) || (scancode[2]== (uint8_t)0x59)) )
{
//Shift Released (Break code).
shiftstate = false;
}
if ( //on release of Shift, Ctrl, Graph or Code, release all presses
//Check PS/2 Shift released
((scancode[0] == (uint8_t)2) &&
( scancode[1] == (uint8_t)0xF0) &&
((scancode[2] == (uint8_t)0x12) || (scancode[2]== (uint8_t)0x59))) ||
//Check PS/2 Windows key (GRAPH) released
((scancode[0] == (uint8_t)3) &&
( scancode[1] == (uint8_t)0xE0) &&
( scancode[2] == (uint8_t)0xF0) &&
((scancode[3] == (uint8_t)0x1F) || (scancode[3]== (uint8_t)0x27))) ||
//Check PS/2 left Ctrl key released
((scancode[0] == (uint8_t)2) &&
( scancode[1] == (uint8_t)0xF0) &&
((scancode[2] == (uint8_t)0x14))) ||
//Check PS/2 right Ctrl key released
((scancode[0] == (uint8_t)3) &&
( scancode[1] == (uint8_t)0xE0) &&
( scancode[2] == (uint8_t)0xF0) &&
( scancode[3] == (uint8_t)0x14)) ||
//Check PS/2 left Alt key (CODE) released
((scancode[0] == (uint8_t)2) &&
( scancode[1] == (uint8_t)0xF0) &&
( scancode[2] == (uint8_t)0x11)) ||
//Check PS/2 right Alt key (CODE) released
((scancode[0] == (uint8_t)3) &&
( scancode[1] == (uint8_t)0xE0) &&
( scancode[2] == (uint8_t)0xF0) &&
( scancode[3] == (uint8_t)0x11))
)
{
//Shift and/or Graph and/or Control and/or Code were/was released, then force release of all other keys
for(uint8_t i = 0; i < 16; i++)
x_bits[ i ] = X7_SET_OR | X6_SET_OR | X5_SET_OR | X4_SET_OR | X3_SET_OR | X2_SET_OR | X1_SET_OR | X0_SET_OR;
return;
}
if (
((scancode[0] == (uint8_t)3) &&
( scancode[1] == (uint8_t)0xE1) &&
( scancode[2] == (uint8_t)0x14) &&
( scancode[3] == (uint8_t)0x77)) ||
((scancode[0] == (uint8_t)2) &&
( scancode[1] == (uint8_t)0xE0) &&
( scancode[2] == (uint8_t)0x7E)) )
{
//Pause Break Key & Control + Break (Control was already sent at this time).
//Create an effect of press and release of MSX STOP, through:
//dispatch MSX STOP pressed 3 times and 1 MSX STOP release
for(uint16_t i = 0; i < 3; i++) //Keep the MSX STOP key pressed for a while
put_msx_disp_keys_queue_buffer(Y_STOP<<NIBBLE | X_STOP);
put_msx_disp_keys_queue_buffer(Y_STOP<<NIBBLE | X_POLARITY_BIT_MASK | X_STOP); //Then release MSX STOP key
return;
}
//Now searches for PS/2 scan code in Database to match. First search first colunm
linhavarrida = 1;
while (
//(MSX_KEYB_DATABASE_CONVERSION[linhavarrida][0] != scancode[1]) &&
(*(base_of_database+linhavarrida*DB_NUM_COLS+0) != scancode[1]) &&
(linhavarrida < N_DATABASE_REGISTERS) )
{
linhavarrida++;
}
if (
(scancode[0] == (uint8_t)1) &&
(scancode[1] == *(base_of_database+linhavarrida*DB_NUM_COLS+0)) &&
(linhavarrida < N_DATABASE_REGISTERS) )
{
//1 byte key
msx_dispatch();
return;
}
if ((scancode[0] >= (uint8_t)1) &&
(linhavarrida < N_DATABASE_REGISTERS) )
{
//2 bytes key, then now search match on second byte of scancode
while (
(*(base_of_database+linhavarrida*DB_NUM_COLS+1) != scancode[2]) &&
(linhavarrida < N_DATABASE_REGISTERS))
{
linhavarrida++;
}
if(
(scancode[0] == (uint8_t)2) &&
(scancode[1] == *(base_of_database+linhavarrida*DB_NUM_COLS+0)) &&
(scancode[2] == *(base_of_database+linhavarrida*DB_NUM_COLS+1)) )
{
//Ok: Matched code
msx_dispatch();
return;
}
//3 bytes key, then now search match on third byte of scancode
while (
(*(base_of_database+linhavarrida*DB_NUM_COLS+2) != scancode[3]) &&
(linhavarrida < N_DATABASE_REGISTERS) )
{
linhavarrida++;
}
if(
(scancode[0] == 3) &&
(scancode[1] == *(base_of_database+linhavarrida*DB_NUM_COLS+0)) &&
(scancode[2] == *(base_of_database+linhavarrida*DB_NUM_COLS+1)) &&
(scancode[3] == *(base_of_database+linhavarrida*DB_NUM_COLS+2)) )
{
//Ok: Matched code
msx_dispatch();
return;
}
} //if ((scancode[0] >= (uint8_t)1) && (linhavarrida < N_DATABASE_REGISTERS) )
} //void msxmap::convert2msx()
/*
The structure of the Database is:
There are 320 lines, so this structure is capable of manage up to 159 PS/2 keys with their
respective make and break codes. The first and last lines are reserved for control (Database
version, Database unavailable: seek next, double consistensy check, among others);
The three first columns of each line are the mapped scan codes;
The 4th column is The Control Byte, detailed bellow:
CONTROL BYTE:
High nibble is Reserved;
(bit 3) Combined Shift;
(bit 2) Reserved-Not used;
(bits 1-0) Modifyer Type:
.0 - Default mapping
.1 - NumLock Status+Shift changes
.2 - PS/2 Shift
.3 - Reserved-Not used
This table has 3 modifyers: Up two MSX keys are considered to each mapping behavior modifying:
5th and 6th columns have the mapping ".0 - Default mapping";
7th and 8th columns share mappings ".1" and ".2":
".1 - NumLock Status+Shift changes";
".2 - PS/2 Shift", where I need to release the sinalized
Shift in PS/2 to the MSX and put the coded key, and
so, release them, reapplying the Shift key, deppend-
ing on the initial state;
Each column has a MSX coded key with the following structure:
(Bit 7:4) MSX Y PPI 8255 PC3:0 is send to an OC outputs BCD decoder, for example:
In the case of Hotbit HB8000, the keyboard scan is done as a 9 columns scan, CI-16 7445N 08 to 00;
If equals to 1111 (Y=15), there is no MSX key mapped.
(Bit 3) 0: keypress
1: key release;
(Bit 2:0) MSX X, ie, which bit will carry the key, to be read by PPI 8255 PB7:0.
Now in my native language: Português
Primeiramente verifico se este scan, que veio em scancode[n], está referenciado na tabela MSX_KEYB_DATABASE_CONVERSION.
Esta tabela, montada em excel, está pronta para ser colada
A tabela já está com sort, para tornar possível executar uma pesquisa otimizada.
Há 320 linhas, assim esta estrutura é capaz de manejar até 159 teclas de teclado PS/2 com seus
respectivos códigos make e break. As primeira e última linhas são reservadas para controle do Database
(versão, Database inválido: vá para próximo, dupla verificação de consistêncoa, entre outros);
As três primeiras posições (colunas) de cada linha são os scan codes mapeados;
A 4ª coluna é o controle, e tem a seguinte estrutura:
CONTROL BYTE:
High nibble is Reserved;
(bit 3) Combined Shift;
(bit 2) Reserved-Not used;
(bits 1-0) Modifyer Type:
.0 - Default mapping
.1 - NumLock Status+Shift changes
.2 - PS/2 Shift
.3 - Reserved-Not used
Esta tabela contém 3 modificadores: São codificadas até 2 teclas do MSX para cada modificador de mapeamento:
5ª e 6ª colunas contém o mapeamento ".0 - Default mapping";
7ª e 8ª colunas compartilham os mapeamentos 1 e 2:
".1 - NumLock Status+Shift changes";
".2 - PS/2 Shift", onde necessito liberar o Shift sinalizado
no PS/2 para o MSX e colocar as teclas codificadas, e liberá-las,
reinserindo o Shift, se aplicável;
Cada coluna contém uma tecla codificada para o MSX, com a seguinte estrutura:
(Bit 7:4) MSX Y PPI 8255 PC3:0 é enviada à um decoder BCD com OC outputs.
MSX Y PPI 8255 PC3:0. No caso do Hotbit, o scan é feito em 9 colunas, CI-16 7445N 08 a 00;
Se 1111 (Y=15), não há tecla MSX mapeada.
(Bit 3) 0: keypress
1: key release;
(Bit 2:0) MSX X, ou seja, qual bit levará a informação da tecla, a ser lida pela PPI 8255 PB7:0.
*/
//void msxmap::msx_dispatch(volatile uint16_t linhavarrida)
void msxmap::msx_dispatch(void)
{
volatile uint8_t y_local, x_local;
volatile bool x_local_setb;
switch(*(base_of_database+linhavarrida*DB_NUM_COLS+CASEx_TYPE) & CASE_MASK)
{
case 0:
{ // .0 - Default mapping (Columns 4 & 5)
// Key 0:
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
// Verify if key is mapped
if (y_local != y_dummy)
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)X_LOCAL_MASK;
x_local_setb = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)X_POLARITY_BIT_MASK) >> X_POLARITY_BIT_POSITION;
// Calcula x_bits da Key 0 e verifica se o tempo em que foi atualizado o dado de Linha X da Coluna Y,
// com a finalidade de atualizar teclas mesmo sem o PPI ser atualizado.
compute_x_bits_and_check_interrupt_stuck(y_local, x_local, x_local_setb);
}
// Key 1:
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
// Verify if key is mapped
if (y_local != y_dummy)
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & (uint8_t)X_LOCAL_MASK;
if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == (MSX_SHIFT_PRESS))
{
//Shift key
if(shiftstate)
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS); //return MSX Shift key as pressed state
else
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS | X_POLARITY_BIT_MASK); //return MSX Shift key as released state
} // if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
else // if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
{
//Other key: different from Shift key
put_msx_disp_keys_queue_buffer(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1));
} //else // if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
} //if (y_local != y_dummy)
break;
} // .0 - Mapeamento default (Colunas 4 e 5)
case 1:
{ // .1 - Mapeamento NumLock (Colunas 6 e 7)
if (ps2numlockstate ^ shiftstate)
{
//numlock and Shift have different status
// Key 0 (PS/2 NumLock ON (Default)):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
// Verify if key is mapped
if (y_local != y_dummy)
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)X_LOCAL_MASK;
x_local_setb = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)X_POLARITY_BIT_MASK) >> X_POLARITY_BIT_POSITION;
compute_x_bits_and_check_interrupt_stuck(y_local, x_local, x_local_setb);
}
// Key 1 (PS/2 NumLock ON (Default)):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
// Verify if key is mapped
if (y_local != y_dummy)
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & (uint8_t)X_LOCAL_MASK;
if( (Y_SHIFT == y_local) && (X_SHIFT == x_local) ) //if SHIFT, return to shiftstate
{
//Shift key
if(shiftstate)
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS); //return MSX Shift key as pressed state
else
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS | X_POLARITY_BIT_MASK); //return MSX Shift key as released state
} //if( (Y_SHIFT == y_local) && (X_SHIFT == x_local) )
else // if( (Y_SHIFT == y_local) && (X_SHIFT == x_local) )
{
//Other key: different from Shift key
put_msx_disp_keys_queue_buffer(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1));
} //else // if( (Y_SHIFT == y_local) && (X_SHIFT == x_local) )
} //if (y_local != y_dummy)
}
else //if (ps2numlockstate ^ shiftstate)
{
//numlock and Shift share the same status
// Verify if there are keys mapped
// Key 0 (PS/2 NumLock OFF):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY0) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
// Verify if key is mapped
if (y_local != y_dummy)
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY0) & (uint8_t)X_LOCAL_MASK;
x_local_setb = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY0) & (uint8_t)X_POLARITY_BIT_MASK) >> X_POLARITY_BIT_POSITION;
// Calcula x_bits da Key 0 e verifica se o tempo em que foi atualizado o dado de Linha X da Coluna Y,
// com a finalidade de atualizar teclas mesmo sem o PPI ser atualizado.
compute_x_bits_and_check_interrupt_stuck(y_local, x_local, x_local_setb);
} //if (y_local != y_dummy)
// Key 1 (PS/2 NumLock OFF):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY1) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
// Verify if key is mapped
if (y_local != y_dummy)
{
if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == (MSX_SHIFT_PRESS))
{
//Shift key
if(shiftstate)
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS); //return MSX Shift key as pressed state
else
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS | X_POLARITY_BIT_MASK); //return MSX Shift key as released state
} //if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
else // if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
{
//Other key: different from Shift key
put_msx_disp_keys_queue_buffer(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY1));
} //else // if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE1_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
} //if (y_local != y_dummy)
} //if (ps2numlockstate ^ shiftstate)
break;
} // .1 - Mapeamento NumLock (Colunas 6 e 7)
case 2:
{ // .2 - Mapeamento alternativo (PS/2 Left and Right Shift) (Colunas 6 e 7)
if (!shiftstate)
{
//Shift state is OFF (not pressed), so performs as CASE 0 (see the displacement CASE0_KEY...)
// Key 0 (PS/2 NumLock ON (Default)):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
if (y_local != y_dummy) // Verify if key is mapped
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)X_LOCAL_MASK;
x_local_setb = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY0) & (uint8_t)X_POLARITY_BIT_MASK) >> X_POLARITY_BIT_POSITION;
// Calcula x_bits da Key 0 e verifica se o tempo em que foi atualizado o dado de Linha X da Coluna Y,
// com a finalidade de atualizar teclas mesmo sem o PPI ser atualizado.
compute_x_bits_and_check_interrupt_stuck(y_local, x_local, x_local_setb);
}
// Key 1 (PS/2 NumLock ON (Default)):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
if (y_local != y_dummy) // Verify if key is mapped
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & (uint8_t)X_LOCAL_MASK;
if( ((*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1)) & ~(uint8_t)X_POLARITY_BIT_MASK) == (MSX_SHIFT_PRESS))
{
//Shift key
if(shiftstate)
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS); //return MSX Shift key as pressed state
else
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS | X_POLARITY_BIT_MASK); //return MSX Shift key as released state
} //if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
else // if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
{
//Other key: different from Shift key
put_msx_disp_keys_queue_buffer(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1));
} //else // if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE0_KEY1) & ~(uint8_t)X_POLARITY_BIT_MASK) == MSX_SHIFT_PRESS)
} //if (y_local != y_dummy)
}
else //case 2: shiftstate is ON now!, so it is a true case 2 (see the displacement CASE2_KEY...)
{
// Verifica se ha teclas mapeadas
// Key 0 (PS/2 Left and Right Shift):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY0) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
if (y_local != y_dummy) // Verify if key is mapped
{
//if CODE or GRAPH keys to be pressed, then first release MSX Shift key, and so, press CODE (or GRAPH)
if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY0) == (uint8_t)0x64) || //CODE key pressed
(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY0) == (uint8_t)0x62) ) //GRAPH key pressed
{
//then first release MSX Shift key
compute_x_bits_and_check_interrupt_stuck(Y_SHIFT, X_SHIFT, true);
//and so, press CODE (or GRAPH)
put_msx_disp_keys_queue_buffer(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY0));
} //if (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY0) == 0x64) //if CODE key pressed
else //put default key
{
x_local = *(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY0) & (uint8_t)X_LOCAL_MASK;
x_local_setb = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY0) & (uint8_t)X_POLARITY_BIT_MASK) >> X_POLARITY_BIT_POSITION;
compute_x_bits_and_check_interrupt_stuck(y_local, x_local, x_local_setb);
}
} //if (y_local != y_dummy)
// Key 1 (PS/2 Left and Right Shift):
y_local = (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1) & (uint8_t)Y_LOCAL_MASK) >> NIBBLE;
// Verify if key is mapped
if (y_local != y_dummy)
{
//So, first send CODE (or GRAPH) released, or another one, BUT if is MSX Shift at this position, it is release
if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1) & ~(uint8_t)X_POLARITY_BIT_MASK)
== (MSX_SHIFT_PRESS) )
{
//Shift key
if(shiftstate)
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS); //return MSX Shift key as pressed state
else
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS | X_POLARITY_BIT_MASK); //return MSX Shift key as released state
} //if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1) & ~(uint8_t)X_POLARITY_BIT_MASK) == (MSX_SHIFT_PRESS))
else //if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1) & ~(uint8_t)X_POLARITY_BIT_MASK) == (MSX_SHIFT_PRESS))
{
put_msx_disp_keys_queue_buffer(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1));
//and then, if it is CODE (or GRAPH) Release, reinsert the dropped MSX Shift key
if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1) == (uint8_t)0x6C) || //if CODE key released
(*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1) == (uint8_t)0x6A) ) //if GRAPH key released
{
//and then, as it is CODE (or GRAPH) Release, reinsert the dropped MSX Shift key
if(shiftstate)
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS); //return MSX Shift key as pressed state
else
put_msx_disp_keys_queue_buffer(MSX_SHIFT_PRESS | X_POLARITY_BIT_MASK); //return MSX Shift key as released state
} //if CODE key released or GRAPH key released
} //if( (*(base_of_database+linhavarrida*DB_NUM_COLS+CASE2_KEY1) & ~(uint8_t)X_POLARITY_BIT_MASK) == (MSX_SHIFT_PRESS))
} //if (y_local != y_dummy)
} //case 2: if (!shiftstate)
} // .2 - Alternate Mapping (PS/2 Left and Right Shift) (Colunas 6 e 7)
} //switch(*(base_of_database+linhavarrida*DB_NUM_COLS+3) & CASE_MASK)
} //void msxmap::msx_dispatch(void)
void msxmap::compute_x_bits_and_check_interrupt_stuck (
volatile uint8_t y_local, uint8_t x_local, bool x_local_setb)
{
uint16_t msx_Y_scan;
switch (x_local)
{
case 0:
{
if (x_local_setb) //key release
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X0_SET_OR) & X0_SET_AND;
break;
}
else //keypress
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X0_CLEAR_AND) | X0_CLEAR_OR;
break;
}
}
case 1:
{
if (x_local_setb) //key release
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X1_SET_OR) & X1_SET_AND;
break;
}
else //keypress
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X1_CLEAR_AND) | X1_CLEAR_OR;
break;
}
}
case 2:
{
if (x_local_setb)
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X2_SET_OR) & X2_SET_AND;
break;
}
else
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X2_CLEAR_AND) | X2_CLEAR_OR;
break;
}
}
case 3:
{
if (x_local_setb)
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X3_SET_OR) & X3_SET_AND;
break;
}
else
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X3_CLEAR_AND) | X3_CLEAR_OR;
break;
}
}
case 4:
{
if (x_local_setb)
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X4_SET_OR) & X4_SET_AND;
break;
}
else
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X4_CLEAR_AND) | X4_CLEAR_OR;
break;
}
}
case 5:
{
if (x_local_setb)
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X5_SET_OR) & X5_SET_AND;
break;
}
else
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X5_CLEAR_AND) | X5_CLEAR_OR;
break;
}
}
case 6:
{
if (x_local_setb)
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X6_SET_OR) & X6_SET_AND;
break;
}
else
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X6_CLEAR_AND) | X6_CLEAR_OR;
break;
}
}
case 7:
{
if (x_local_setb)
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] | X7_SET_OR) & X7_SET_AND;
break;
}
else
{
x_bits[Y_XLAT_TABLE[y_local]] = (x_bits[Y_XLAT_TABLE[y_local]] & X7_CLEAR_AND) | X7_CLEAR_OR;
break;
}
}
}
//See when the Y colunm's XLine was updated, in order to update keys even without the PPI being updated.
if (systicks - previous_y_systick[Y_XLAT_TABLE[y_local]] > MAX_TIME_OF_IDLE_KEYSCAN_SYSTICKS)
{
//MSX is not updating Y, so updating keystrokes by interrupts is not working
//Verify the actual hardware Y_SCAN
// First I have to disable Y_SCAN interrupts, to avoid misspelling due to updates
exti_disable_request(Y3_exti | Y2_exti | Y1_exti | Y0_exti);
#if MCU == STM32F401
// Read the MSX keyboard Y scan through GPIO pins A5:A8, mask to 0 other bits and rotate right 5
msx_Y_scan = (gpio_port_read(Y0_PORT) & Y_MASK) >> 5;
if(Y_XLAT_TABLE[y_local] == msx_Y_scan)
GPIO_BSRR(X_PORT) = x_bits[msx_Y_scan]; //Atomic GPIOB update => Release and press MSX keys for this column
#endif //#if MCU == STM32F401
#if MCU == STM32F103
// Read the MSX keyboard Y scan through GPIO pins A12:A8, mask to 0 other bits and rotate right 8 and 9
msx_Y_scan = (gpio_port_read(GPIOA)) & Y_MASK;
msx_Y_scan = ((msx_Y_scan >> 8) & 0x3) | ((msx_Y_scan >> 9) & 0xC);
GPIOB_BSRR = x_bits[msx_Y_scan]; //Atomic GPIOB update => Release and press MSX keys for this column
#endif //#if MCU == STM32F103
//Than reenable Y_SCAN interrupts
exti_enable_request(Y0_exti | Y1_exti | Y2_exti | Y3_exti);
}
}
/*************************************************************************************************/
/*************************************************************************************************/
/******************************************* ISR's ***********************************************/
/*************************************************************************************************/
/*************************************************************************************************/
#if MCU == STM32F103
void exti15_10_isr(void) // PC2 and PC3 - It works like interrupt on change of each one of Y connected pins
{
volatile uint16_t msx_Y_scan;
//Debug & performance measurement
gpio_clear(Dbg_Yint_PORT, Dbg_Yint2and3_PIN); //Signs start of interruption
// Read the MSX keyboard Y scan through GPIO pins A12:A8, mask to 0 other bits and rotate right 8
msx_Y_scan = (gpio_port_read(GPIOA)) & Y_MASK;
msx_Y_scan = ((msx_Y_scan >> 8) & 0x3) | ((msx_Y_scan >> 9) & 0xC);
GPIOB_BSRR = x_bits[msx_Y_scan]; //Atomic GPIOB update => Release and press MSX keys for this column
//Debug & performance measurement
gpio_set(Dbg_Yint_PORT, Dbg_Yint2and3_PIN); //Signs end of interruption. Default condition is "1"