Update a README.
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Gregory Nutt
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@ -103,14 +103,14 @@ UARTs
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eZ80 PIN BOARD SIGNAL CN1 ACCESS
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eZ80 PIN BOARD SIGNAL CN1 ACCESS
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=======================================
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=======================================
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PD0/TXD1/IR_IXD CN1_TX0 Pin 61
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PD0/TXD0/IR_IXD CN1_TX0 Pin 61
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PD1/RXD1/IR_RXD CN1_RX0 Pin 59
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PD1/RXD0/IR_RXD CN1_RX0 Pin 59
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PD2/RTS1 CN1_RTS0 Pin 63
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PD2/RTS0 CN1_RTS0 Pin 63
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PD3/CTS1 CN1_CTS0 Pin 65
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PD3/CTS0 CN1_CTS0 Pin 65
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PD4/DTR1 CN1_DTR0 Pin 67
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PD4/DTR0 CN1_DTR0 Pin 67
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PD5/DSR1 CN1_DSR0 Pin 69
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PD5/DSR0 CN1_DSR0 Pin 69
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PD6/DCD1 CN1_DCD0 Pin 71
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PD6/DCD0 CN1_DCD0 Pin 71
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PD7/RIO1 CN1_RI0 Pin 73
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PD7/RIO0 CN1_RI0 Pin 73
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UART 0: All of Port C pins can support UART1 functions when configured
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UART 0: All of Port C pins can support UART1 functions when configured
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for the alternate function 7. For typical configurations only RXD and TXD
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for the alternate function 7. For typical configurations only RXD and TXD
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@ -127,14 +127,73 @@ UARTs
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PC6/DCD1 CN1_DCD1 Pin 72
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PC6/DCD1 CN1_DCD1 Pin 72
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PC7/RIO1 CN1_RI1 Pin 74
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PC7/RIO1 CN1_RI1 Pin 74
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For use with a host terminal emulation, it will be necessary to connect
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either a TTL-to-RS232 or a TTL-to-USB Serial adapter to CN1 pins 59 and
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61, and 60 and 62, depending on the selected UART.
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Serial Keyboard and VGA Display
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Serial Keyboard and VGA Display
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-------------------------------
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-------------------------------
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The serial console can also be implemented using the MakerLisp USB
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The serial console can also be implemented using the MakerLisp USB
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Keyboard Controller Board and VGA Display Controller. These are accessed
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Keyboard Controller Board and VGA Display Controller. These are accessed
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via the two UART ports.
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via the one UART port, UART0.
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[more to be provided]
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In the default MakerLisp configuration. These boards are connected as
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follows:
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1. VGA display controller connections (UART0 TX)
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Board interface header
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5 – 5V regulated power input
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RX – VGA Display Controller serial input
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C – VGA Display Controller ready output
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TX – VGA Display Controller serial output
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G – GND
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Connections:
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a. 5V '5' pin on VGA board to expansion board power distribution 5V.
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b. Ground 'G' pin on VGA board to expansion board power distribution
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ground.
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c. Receive 'RX' pin on VGA board to expansion board GPIO PD0 (TXD0).
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d. Communication, terminal ready indicator 'C' pin on VGA board to
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expansion board GPIO PB1.
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e. Transmit 'TX' pin on VGA board to USB keyboard controller 'R'
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TBD: Beyond the simple UART interface, what additional support for the
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ready pin 'C' is required.
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2. USB keyboard controller (UART0 RX)
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Board interface header
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5 – 5V regulated power input
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R – USB Keyboard Controller serial input
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T – USB Keyboard Controller serial output
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G – GND
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Connections:
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a. 5V '5' pin on USB board to (other) expansion board power
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distribution 5V.
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b. Ground 'G' pin on USB board to (other) expansion board power
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distribution ground.
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c. Receive 'R' pin on USB board to VGA board 'TX' (see above).
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d. Transmit 'T' pin on USB board to expansion board GPIO PD1 (RXD0).
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If your keyboard does not seem to be doing anything, check the 'RX'
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jumper on the expansion board. For input from a USB keyboard, and NOT
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the USB/UART connection, you want this jumper REMOVED, not bridging the
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two header pins front to back.
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TBD: What is the UART configuration when used with the VGA and Keyboard
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adapters?
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Default Serial Console
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----------------------
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UART0 is the default serial console in all configurations unless
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otherwise noted in the description of the configuration.
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LEDs and Buttons
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LEDs and Buttons
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================
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================
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@ -222,6 +281,15 @@ Configuration Subdirectories
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NOTES:
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NOTES:
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1. A serial console is provided on UART0. It will be necessary to
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1. A serial console is provided on UART0. This configuration may work
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connect either a TTL-to-RS232 or a TTL-to-USB Serial adapter to CN1
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with or without the the VGA and Keyboard adapter boards. For use
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pins 59 and 61.
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with a host terminal emulation without the accessory boards, it will
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be necessary to connect either a TTL-to-RS232 or a TTL-to-USB Serial
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adapter to CN1 pins 59 and 61.
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The default baud setting is 57600N1.
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TBD: Although the UART0 is the same with the VGA and Keyboard
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controller boards, this configuration may not compatible with
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those accessories. Those may require additional support for
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the VGA data ready pin. A BAUD mismatch is also likely.
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