168 lines
5.4 KiB
C
168 lines
5.4 KiB
C
//
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//
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// File Name : Brother_Typewriter.c
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// Author : Ted Fried, MicroCore Labs
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// Creation : 8/27/2020
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// Code Type : Synthesizable
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//
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// Description:
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// ============
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//
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// Arduino-Leonardo converter for UART to Brother Word Processor Typewriter
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//
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//
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//------------------------------------------------------------------------
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#define SHIFT_ON 0x80
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#define SHIFT_OFF 0x81
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unsigned int char_count=0;
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unsigned int decoded_character=0;
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unsigned int uart_character=0;
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byte decoder_array[128] = {
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/* 0 1 2 3 4 5 6 7 8 9 */
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/* 0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 1 */ 0xb0, 0x00, 0x00, 0xb0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* 2 */ 0x00, 0x49, 0x4b, 0x38, 0x37, 0x39, 0x3f, 0x4c, 0x23, 0x16,
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/* 3 */ 0x0c, 0x8c, 0x04, 0x8c, 0xe4, 0xcc, 0x2c, 0xac, 0xec, 0xe4,
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/* 4 */ 0x9c, 0x0c, 0x1c, 0xbc, 0xe4, 0xb4, 0x74, 0xf4, 0x0c, 0x8c,
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/* 5 */ 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0xdc, 0xdc,
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/* 6 */ 0x00, 0xbc, 0x59, 0xf4, 0x4c, 0x86, 0x46, 0xc6, 0x26, 0xa6,
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/* 7 */ 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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/* 8 */ 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e,
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/* 9 */ 0x5e, 0xba, 0x03, 0xba, 0x5e, 0xb4, 0x53, 0x86, 0x46, 0xc6,
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/* 10 */ 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6,
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/* 11 */ 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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/* 12 */ 0x1e, 0x9e, 0x5e, 0xba, 0x5e, 0xba, 0x53, 0x55 };
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//------------------------------------------------------------------------
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//------------------------------------------------------------------------
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void setup()
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{
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Serial.begin(300); // UART to the Host
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pinMode (10, INPUT) ; // hi-Z the CLK Pin
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pinMode (11, INPUT) ; // hi-Z the DATA Pin
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pinMode (12, OUTPUT) ;
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}
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//------------------------------------------------------------------------
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//------------------------------------------------------------------------
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void pause()
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{
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digitalWrite(12, LOW);
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digitalWrite(12, LOW);
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digitalWrite(12, LOW);
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digitalWrite(12, LOW);
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digitalWrite(12, LOW);
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return;
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}
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//------------------------------------------------------------------------
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//------------------------------------------------------------------------
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void send_to_typewriter(unsigned char char_out)
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{
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// Shift out the converted byte to the typewriter.
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// Send as "open collector", or drive logic '0', but
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// let bus go high-impedance (turn off IO output) for logic '1'
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//
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if ((char_out&0x80) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 7
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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if ((char_out&0x40) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 6
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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if ((char_out&0x20) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 5
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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if ((char_out&0x10) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 4
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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if ((char_out&0x08) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 3
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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if ((char_out&0x04) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 2
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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if ((char_out&0x02) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 1
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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if ((char_out&0x01) != 0) pinMode (11, INPUT); else pinMode (11, OUTPUT); pause(); // DATA 0
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pinMode (10, OUTPUT); pause(); // CLK = 0
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pinMode (10, INPUT); pause(); // CLK = hi-Z
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pinMode (11, INPUT) ; // hi-Z the DATA Pin
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return;
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}
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//------------------------------------------------------------------------
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//------------------------------------------------------------------------
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void caps_on(unsigned char char_in)
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{
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// Send the SHIFT key to the typewriter if required.
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//
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if (uart_character>62 && uart_character<92) send_to_typewriter(SHIFT_ON);
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if (uart_character!=39 && uart_character>32 && uart_character<44) send_to_typewriter(SHIFT_ON);
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return;
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}
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//------------------------------------------------------------------------
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//------------------------------------------------------------------------
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void caps_off(unsigned char char_in)
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{
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// Debounce the SHIFT key to the typewriter.
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//
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if (uart_character>62 && uart_character<92) send_to_typewriter(SHIFT_OFF);
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if (uart_character!=39 && uart_character>32 && uart_character<44) send_to_typewriter(SHIFT_OFF);
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return;
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}
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//------------------------------------------------------------------------
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//------------------------------------------------------------------------
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void loop()
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{
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// Poll the Host-side UART for characters to send to the typewriter.
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// Decode the ASCII characters into the sequence of commands to send to the typewriter.
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//
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if (Serial.available())
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{
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uart_character = Serial.read();
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decoded_character = decoder_array[uart_character];
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caps_on(uart_character);
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delay(1);
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send_to_typewriter(decoded_character);
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delay(1);
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caps_off(uart_character);
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delay(1);
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}
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}
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