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Drawer QR Code ISO/IEC18004 in Software the busy bit

the busy bit
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There is a bit in the LCD that is set to 1 when the LCD is busy and cannot accept any more data from outside. If we want to operate as rapidly as possible, we need to wait until this bit is set to zero and then send the next instruction immediately. The Read/Write bit and the Register Select bit have to be set as shown to access the Busy bit. The code to read the Busy bit is provided in Program 21-4.
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8-bit Mode
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program 21-4
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Code Segment to Check the Busy Bit
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PRI CHECK_BUSY | BUSY_BIT 'routine to check busy bit OUTA[ReadWrite] := 1 'Set to read the busy bit OUTA[RegSelect] := 0 'Set to read the busy bit DIRA[DataBit7..DataBit0] := %0000_0000 'Set the port to be an input REPEAT 'Keep doing it till clear OUTA[Enable] := 1 'set to 1, to toggle H>L this bit BUSY_BIT := INA[DataBit7] 'the busy bit is bit 7 OUTA[Enable] := 0 'enable bit low = H>L toggle WHILE (BUSY_BIT == 1) 'do it as long as the busy bit is 1 DIRA[DataBit7..DataBit0] := %1111_1111 'done, port bck to output
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send CharaCter
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Once we have positioned the cursor, we are ready to send the alphanumeric data we want to display to the LCD. The LCD is prepared for data reception by setting the three control lines as shown in Program 21-5. Each time the Enable line is toggled, the data on the bus is transferred to the LCD. The data must be sent a byte at a time.
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program 21-5 Code Segment to Send a Single Character to the LCD
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PRI SEND_CHAR (DISPLAY_DATA) 'set up for writing to the display CHECK_BUSY 'wait for busy bit to clear before sending OUTA[ReadWrite] := 0 'Set up to read busy bit OUTA[RegSelect] := 1 'Set up to read busy bit OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit0] := DISPLAY_DATA 'Ready to SEND data in OUTA[Enable] := 0 'Toggle the bit H>L
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send instrUCtion
We also need to be able to send the LCD non-alphanumeric instructions. This is similar to the character routine and is shown in Program 21-6.
program 21-6 Code Segment to Send an Instruction to the LCD
PRI SEND_INSTRUCTION (DISPLAY_DATA) 'set up for writing instructions CHECK_BUSY 'wait for busy bit to clear OUTA[ReadWrite] := 0 'Set up to read busy bit OUTA[RegSelect] := 0 'Set up to read busy bit OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit0] := DISPLAY_DATA 'Ready to READ data in OUTA[Enable] := 0 'Toggle the bit H>L
Understanding a 16-CharaCter-by-2-Line LCd dispLay
At this time, all these methods are defined as being private to this object. Later on we will make them public, and any method in another procedure will be able to call and use them. When we combine all the preceding code into a program, we get the listing in Program 21-7.
program 21-7 Minimal Program to Send Characters to the LCD
{{11 Sep 09 Harprit Sandhu LCDminimal.spin Propeller Tool Ver 1.2.6 21 Program 7 PROGRAM TO BEGIN USING THE LCD A minimal LCD implementation to allow us to use the LCD in our experiments immediately. This program is an absolutely minimal implementation to make the LCD usable. You can work on improving it. POWER ETC: - - BASIC CONNECTIONS 1 0 9 8 7 6 5 4 3 X X G 3 2 1 0 9 8 7 6 FOR THE EDUCATION KIT ARE STANDARD PROPELLER CHIP CONNECTIONS AND ARE 0 1 2 3 4 5 6 7 G B R 3 8 9 0 1 2 3 4 5 NOT SHOWN HERE 5VDC --- G 5 G S W E 0 1 2 3 4 5 6 7 16 CHAR BY 2 LINE LCD DISPLAY GND 8 BIT MODE (continued) Schematic
8-bit Mode
program 21-7
Minimal Program to Send Characters to the LCD (continued)
Revisions
}} CON {{ Pin assignments are assigned as constants because the pins are fixed. These numbers reflect the actual wiring on the board between the Propeller and the 16x2 LCD display. If you want the LCD on other lines, that would have to be specified here. We are going to use 8-bit mode to transfer data. All these numbers refer to lines on the Propeller. }} _CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 RegSelect ReadWrite Enable DataBit0 DataBit7 waitPeriod high low = 16 = 17 = 18 = 8 = 15 =500_000 =1 =0 'The system clock spec 'the oscillator frequency
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