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//===============================
// LCD Test Program
//-------------------------------
// for VirtexE Evaluation Board
// May.1 2003 Ver.1
//===============================
 
//======================================================
// Address Map
//======================================================
// address           sz  wt wd device
// 00000000-00001FFF  8K 0  32 ROM (code)
// 00002000-00003DFF  6K 0  32 RAM (data)
// 00003E00-00003FFF 512 0  32 RAM (stack)
//
// 00000000-0000FFFF 64K 0  32 RAM (shadow every 16KB)
// 00010000-0001FFFF 64K 3  32 RAM (shadow every 16KB)
// 00020000-0002FFFF 64K 0  16 RAM (shadow every 16KB)
// 00030000-0003FFFF 64K 3  16 RAM (shadow every 16KB)
// 00040000-ABCCFFFF (shadow RAM)
// ABCD0000-ABCD00FF 256 3  32 PIO (shadow every 4B)
// ABCD0100-ABCD01FF 256 3  32 UART(shadow every 4B)
// ABCD0200-ABCD02FF 256 3  32 SYS (shadow every 8B)
// ABCD0300-FFFBFFFF (shadow RAM)
// FFFC0000-FFFCFFFF 64K 0  32 RAM (shadow every 16KB)
// FFFD0000-FFFDFFFF 64K 3  32 RAM (shadow every 16KB)
// FFFE0000-FFFEFFFF 64K 0  16 RAM (shadow every 16KB)
// FFFF0000-FFFFFFFF 64K 3  16 RAM (shadow every 16KB)
// 
//======================================================
// PORT OUTPUT
//======================================================
// ABCD0000 : reserved
//   31    30    29    28    27    26    25    24
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |     |     |     |     |     |     |     |     |
//  -----------------------------------------------;
// 
// ABCD0001 : KEYYO (Key SCAN Y-axis out)
//   23    22    21    20    19    18    17    16
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |     |     |     | KY4 | KY3 | KY2 | KY1 | KY0 |
//  -----------------------------------------------
// 
// ABCD0002 : LCDCON (LCD Control Signal)
//   15    14    13    12    11    10     9     8
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |     |     |     |     |     |  E  | R/W |  RS |
//  -----------------------------------------------
// 
// ABCD0003 : LCDOUT (Write Data to LCD)
//    7     6     5     4     3     2     1     0
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// | DW7 | DW6 | DW5 | DW4 | DW3 | DW2 | DW1 | DW0 |
//  -----------------------------------------------
// 
//======================================================
// PORT INPUT
//======================================================
// ABCD0000 : reserved
//   31    30    29    28    27    26    25    24
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |     |     |     |     |     |     |     |     |
//  -----------------------------------------------;
// 
// ABCD0001 : KEYXI (Key SCAN X-axis in)
//   23    22    21    20    19    18    17    16
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |     |     |     | KX4 | KX3 | KX2 | KX1 | KX0 |
//  -----------------------------------------------
// 
// ABCD0002 : reserved
//  15    14    13    12    11    10     9     8
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |     |     |     |     |     |     |     |    |
//  -----------------------------------------------
// 
// ABCD0003 : LCDIN (Read Data from LCD)
//    7     6     5     4     3     2     1     0
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 | DR0 |
//  -----------------------------------------------
// 
//======================================================
// UART: SASC (www.opencores.com)
// Simple Asynchronous Serial Communication Device
//======================================================
// ABCD0100 : UARTBG0 Baud Rate Generator Div0 (R/W)
//   31    30    29    28    27    26    25    24
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// | B07 | B06 | B05 | B04 | B03 | B02 | B01 | B00 |
//  -----------------------------------------------
// 
// ABCD0101 : UARTBG1 Baud Rate Generator Div1 (R/W)
//   23    22    21    20    19    18    17    16
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// | B17 | B16 | B15 | B14 | B13 | B12 | B11 | B10 |
//  -----------------------------------------------
// 
// ABCD0102 : UARTCON (TXF=full_o, RXE=empty_o) (R only)
//   15    14    13    12    11    10     9      8
//    7     6     5     4     3     2     1      0
//  -----------------------------------------------
// |     |     |     |     |     |     | TXF | RXE |
//  -----------------------------------------------
// 
// ABCD0103 : UARTTXD(W only)/UARTRXD(R only)
//    7     6     5     4     3     2     1     0
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// | TR7 | TR6 | TR5 | TR4 | TR3 | TR2 | TR1 | TR0 |
//  -----------------------------------------------
// 
//======================================================
// System Controller
// Interrupt and Exception Controller
//======================================================
// ABCD0200 : INTCTL Interrupt Control (32bit R/W only)
//   31    30    29    28    27    26    25    24
//  -----------------------------------------------
// |E_NMI|E_IRQ|E_CER|E_DER|E_MRS|     |TMRON|BRKON|
//  -----------------------------------------------
//   23    22    21    20    19    18    17    16
//  -----------------------------------------------
// |ILVL3|ILVL2|ILVL1|ILVL0|IVEC7|IVEC6|IVEC5|IVEC4|
//  ----------------------------------------------- 
//   15    14    13    12    11    10     9     8
//  -----------------------------------------------
// |IVEC3|IVEC2|IVEC1|IVEC0|TMR11|TMR10|TMR09|TMR08|
//  -----------------------------------------------  
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |TMR07|TMR06|TMR05|TMR04|TMR03|TMR02|TMR01|TMR00|
//  ----------------------------------------------- 
//     bit31: E_NMI Emulate NMI Interrupt     (W only)
//     bit30: E_IRQ Emulate IRQ Interrupt     (W only)
//     bit29: E_CER Emulate CPU Address Error (W only)
//     bit28: E_DER Emulate DMA Address Error (W only)
//     bit27: E_MRS Emulate Manual Reset      (W only)                               
//     bit26: reserved
//     bit25: TMRON INTTMR OFF/ON             (0:OFF, 1:ON)
//     bit24: BRKON Address Break(NMI) OFF/ON (0:OFF, 1:ON)
//     bit23: ILVL3 IRQ ILevel 3
//     bit22: ILVL2 IRQ ILevel 2
//     bit21: ILVL1 IRQ ILevel 1
//     bit20: ILVL0 IRQ ILevel 0
//     bit19: IVEC7 IRQ Vector 7
//     bit18: IVEC6 IRQ Vector 6
//     bit17: IVEC5 IRQ Vector 5
//     bit16: IVEC4 IRQ Vector 4
//     bit15: IVEC3 IRQ Vector 3
//     bit14: IVEC2 IRQ Vector 2
//     bit13: IVEC1 IRQ Vector 1
//     bit12: IVEC0 IRQ Vector 0
//     bit11: TMR11 (12 bit interval timer to generate IRQ)
//     ...
//     bit 0: TMR00 (12 bit interval timer to generate IRQ)
// 
// ABCD0204 : BRKADR Break Address (16bit R/W only)
//   15    14    13    12    11    10     9     8
//  -----------------------------------------------
// |ADR15|ADR14|ADR13|ADR12|ADR11|ADR10|ADR09|ADR08|
//  -----------------------------------------------  
//    7     6     5     4     3     2     1     0
//  -----------------------------------------------
// |ADR07|ADR06|ADR05|ADR04|ADR03|ADR02|ADR01|ADR00|
//  ----------------------------------------------- 
//     bit15: ADR15 Break Address15
//     ...
//     bit00: ADR00 Break Address00
// 
 
#include "common.h"
 
//=================
// Define Functions
//=================
void          lcd_message(unsigned char pos, unsigned char *pstr);
void          lcd_disp(unsigned char chr);
void          lcd_pos(unsigned char pos);
void          lcd_ready(void);
unsigned char lcd_rd(int);
void          lcd_wr(int, unsigned char);
void          lcd_init(void);
 
//=============
// Main Routine
//=============
void main_sh(void)
{
    unsigned char mes_welcome[]   = "<SuperH in FPGA>";
    char data;
    int i;
 
    //-----------
    // Initialize
    //-----------
    lcd_init();
    lcd_message(0, mes_welcome);
    data = 0;
 
    //----------
    // Main Loop
    //----------
    while(1)
    {
        if ((data % 16) == 0) lcd_pos(16);
        lcd_disp(data);
        data++;
 
        for (i = 0 ; i < 100000 ; i++);
    }
}
 
//****************************************************
//*                                                  *
//*                 LCD Utilities                    *
//*                                                  *
//****************************************************
 
//========================================
// Print a Message from Current Position
//----------------------------------------
//     Input  : pstr = message top address
//     Outpur : none
//========================================
void lcd_message(unsigned char pos, unsigned char *pstr)
{
    unsigned char *pmessage;
 
    lcd_pos(pos);
    pmessage = pstr;
    while (*pmessage) lcd_disp(*pmessage++);
}
 
//==========================================
// Display One Character on Current Position
//------------------------------------------
//     Input  : chr = display charcter
//     Output : none
//==========================================
void lcd_disp(unsigned char chr)
{
    lcd_ready();
    lcd_wr(DATA, chr);
}
 
//================================
// Set LCD Display Position
//--------------------------------
//     Input  : pos = position
//                1st line = 00-15
//                2nd line = 16-31
//     Ouput  : none
//================================
void lcd_pos(unsigned char pos)
{
    unsigned char phypos;
 
    phypos = pos % 32;
    if (phypos >= 16)
        phypos = (phypos - 16) + 64;
    phypos = phypos | 0x80; 
 
    lcd_ready();
    lcd_wr(INST, phypos);
}
 
//=====================
// Wait until LCD ready
//---------------------
//     Input  : none
//     Output : none 
//=====================
void lcd_ready(void)
{
    while ((lcd_rd(INST) & 0x80) == 0x80); 
}
 
//=================================
// LCD Read
//---------------------------------
//     Input  : rs (0=Instr,1=Data)
//     Output : lcd_rd (Read Data) 
//=================================
unsigned char lcd_rd(int rs)
{
    int i;
    unsigned char dummy;
    unsigned char data;
 
    PORTO.LCDCON.BYTE = 0x02 | (rs & 0x01);
 
    // wait 60ns = 2cyc@20MHz
    dummy = PORTI.RESERVED_0; 
    dummy = PORTI.RESERVED_0;
 
 
    PORTO.LCDCON.BYTE = 0x06 | (rs & 0x01);
 
    // wait 500ns = 10cyc@20MHz
    for (i = 0 ; i <= 10 ; i++) dummy = PORTI.RESERVED_0;
 
    data = PORTI.LCDIN;
 
    PORTO.LCDCON.BYTE = 0x02 | (rs & 0x01);
 
    // wait 500ns = 10cyc@20MHz
    for (i = 0 ; i <= 10 ; i++) dummy = PORTI.RESERVED_0;
 
    return(data);
}
 
//=================================
// LCD Write
//---------------------------------
//     Input  : rs (0=Instr,1=Data)
//              wd (Write Data)
//     Output : none
//=================================
void lcd_wr(int rs, unsigned char wd)
{
    int i;
    unsigned char dummy;
 
    PORTO.LCDOUT = wd;
 
    PORTO.LCDCON.BYTE = 0x00 | (rs & 0x01);
 
    // wait 60ns = 2cyc@20MHz
    dummy = PORTI.RESERVED_0; 
    dummy = PORTI.RESERVED_0;
 
    PORTO.LCDCON.BYTE = 0x04 | (rs & 0x01);
 
    // wait 500ns = 10cyc@20MHz
    for (i = 0 ; i <= 10 ; i++) dummy = PORTI.RESERVED_0;
 
    PORTO.LCDCON.BYTE = 0x00 | (rs & 0x01);
 
    // wait 500ns = 10cyc@20MHz
    for (i = 0 ; i <= 10 ; i++) dummy = PORTI.RESERVED_0;
}
 
//==================
// LCD Initialize
//------------------
//     Input  : none
//     Output : none
//==================
void lcd_init(void)
{
    int i;
    unsigned char dummy;
 
    lcd_wr(INST, 0x30);
 
    // wait 4100us=82000cyc@20MHz
    for (i = 0 ; i < 82000 ; i++) dummy = PORTI.RESERVED_0;
 
    lcd_wr(INST, 0x30);
 
    // wait 100us=2000cyc@20MHz
    for (i = 0 ; i < 2000 ; i++) dummy = PORTI.RESERVED_0;
 
    lcd_wr(INST, 0x30);
 
    // set function (8bit, 2lines)
    lcd_ready();
    lcd_wr(INST, 0x38);
 
    // display (disp on, cursor off, blink off)
    lcd_ready();
    lcd_wr(INST, 0x0c);
 
    // clear
    lcd_ready();
    lcd_wr(INST, 0x01);
 
    // entry mode (increment, no-shift)
    lcd_ready();
    lcd_wr(INST, 0x06);
}
 
//===============
// End of Program
//===============