| # iCE40UP5K support |
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| This board directory builds for the iCE40UP5K in the QFN48 (SG48) package. iCE40UP5K SG48 is the part used on the [Gnarly Grey UPDuino Mini board](http://gnarlygrey.atspace.cc/development-platform.html). |
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| ## Peripheral support |
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| So far only UART is tested and supported. Three bits of the PC monitor bus are mapped to the dedicated LED drivers to give some indication of the currently running code. |
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| VGA is brought out to pins but have not been tested. |
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| PS/2, button, and TM1638 front panel are not supported. |
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| At this time, all ROM and RAM are mapped as block RAM, and arachne-pnr reports that 28/30 BRAMs are utilized. If larger ROMs or more RAM is needed, RAM should be moved to SPRAM instead. |
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| The on-chip oscillator and PLL are used to generate the 25MHz clock used by the design. |
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| See the .pcf for pin connections. Note that the iCE40UP5K pin numbers in the .pcf correspond to the UPDuino pin silkscreen labels. |
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| ## Building |
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| Install a recent IceStorm toolchain, and: |
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| ``` |
| $ cd yosys |
| $ make |
| ``` |
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| ## Use |
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| Flash using your method of choice. Attach a 3.3V serial connection to uart_tx (output to PC) and uart_rx (input from PC). Start a terminal at 115200,n,8,1. |
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| Toggling CRESET_B restarts to the Woz monitor. |
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| The Woz monitor is a simple hex debugger. To run BASIC, type: "E000R". Note that both BASIC and the monitor require commands to be input as caps. |
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