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targets: initial implementation for Tillitis TKey device
Signed-off-by: deadprogram <[email protected]>
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‎GNUmakefile‎

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@@ -853,6 +853,8 @@ endif
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@$(MD5SUM) test.hex
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$(TINYGO) build -size short -o test.hex -target=maixbit examples/blinky1
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@$(MD5SUM) test.hex
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$(TINYGO) build -size short -o test.hex -target=tkey examples/blinky1
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@$(MD5SUM) test.hex
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ifneq ($(WASM), 0)
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$(TINYGO) build -size short -o wasm.wasm -target=wasm examples/wasm/export
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$(TINYGO) build -size short -o wasm.wasm -target=wasm examples/wasm/main

‎src/device/tkey/crt0.S‎

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// SPDX-FileCopyrightText: 2022 Tillitis AB <tillitis.se>
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// SPDX-License-Identifier: BSD-2-Clause
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.section ".text.init"
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.global _start
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_start:
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li x1, 0
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li x2, 0
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li x3, 0
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li x4, 0
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li x5, 0
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li x6, 0
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li x7, 0
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li x8, 0
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li x9, 0
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li x10,0
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li x11,0
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li x12,0
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li x13,0
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li x14,0
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li x15,0
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li x16,0
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li x17,0
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li x18,0
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li x19,0
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li x20,0
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li x21,0
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li x22,0
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li x23,0
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li x24,0
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li x25,0
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li x26,0
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li x27,0
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li x28,0
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li x29,0
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li x30,0
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li x31,0
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/* init stack */
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la sp, _stack_top
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/* zero-init bss section */
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la a0, _sbss
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la a1, _ebss
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bge a0, a1, end_init_bss
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loop_init_bss:
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sw zero, 0(a0)
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addi a0, a0, 4
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blt a0, a1, loop_init_bss
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end_init_bss:
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call main

‎src/device/tkey/tkey.go‎

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//go:build tkey
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// Hand written file based on https://github.com/tillitis/tkey-libs/blob/main/include/tkey/tk1_mem.h
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package tkey
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import (
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"runtime/volatile"
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"unsafe"
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)
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// Peripherals
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var (
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TRNG = (*TRNG_Type)(unsafe.Pointer(TK1_MMIO_TRNG_BASE))
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TIMER = (*TIMER_Type)(unsafe.Pointer(TK1_MMIO_TIMER_BASE))
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UDS = (*UDS_Type)(unsafe.Pointer(TK1_MMIO_UDS_BASE))
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UART = (*UART_Type)(unsafe.Pointer(TK1_MMIO_UART_BASE))
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TOUCH = (*TOUCH_Type)(unsafe.Pointer(TK1_MMIO_TOUCH_BASE))
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TK1 = (*TK1_Type)(unsafe.Pointer(TK1_MMIO_TK1_BASE))
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)
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// Memory sections
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const (
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TK1_ROM_BASE uintptr = 0x00000000
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TK1_RAM_BASE uintptr = 0x40000000
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TK1_MMIO_BASE uintptr = 0xc0000000
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TK1_MMIO_TRNG_BASE uintptr = 0xc0000000
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TK1_MMIO_TIMER_BASE uintptr = 0xc1000000
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TK1_MMIO_UDS_BASE uintptr = 0xc2000000
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TK1_MMIO_UART_BASE uintptr = 0xc3000000
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TK1_MMIO_TOUCH_BASE uintptr = 0xc4000000
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TK1_MMIO_FW_RAM_BASE uintptr = 0xd0000000
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TK1_MMIO_TK1_BASE uintptr = 0xff000000
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)
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// Memory section sizes
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const (
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TK1_RAM_SIZE uintptr = 0x20000
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TK1_MMIO_SIZE uintptr = 0x3fffffff
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)
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type TRNG_Type struct {
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_ [36]byte
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STATUS volatile.Register16
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_ [108]byte
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ENTROPY volatile.Register16
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}
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type TIMER_Type struct {
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_ [32]byte
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CTRL volatile.Register16
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_ [2]byte
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STATUS volatile.Register16
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_ [2]byte
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PRESCALER volatile.Register32
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TIMER volatile.Register32
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}
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type UDS_Type struct {
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DATA [8]volatile.Register16
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}
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type UART_Type struct {
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_ [40]byte
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BIT_RATE volatile.Register16
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_ [2]byte
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DATA_BITS volatile.Register16
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_ [2]byte
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STOP_BITS volatile.Register16
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_ [58]byte
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RX_STATUS volatile.Register16
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_ [2]byte
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RX_DATA volatile.Register16
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_ [2]byte
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RX_BYTES volatile.Register16
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_ [16]byte
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TX_STATUS volatile.Register16
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_ [2]byte
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TX_DATA volatile.Register16
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}
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type TOUCH_Type struct {
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_ [36]byte
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STATUS volatile.Register16
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}
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type TK1_Type struct {
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NAME0 [4]volatile.Register8
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NAME1 [4]volatile.Register8
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VERSION [4]volatile.Register8
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_ [16]byte
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SWITCH_APP volatile.Register32
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_ [4]byte
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LED volatile.Register32
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GPIO volatile.Register16
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APP_ADDR volatile.Register32
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APP_SIZE volatile.Register32
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BLAKE2S volatile.Register32
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_ [56]byte
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CDI_FIRST [8]volatile.Register16
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_ [38]byte
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UDI_FIRST [2]volatile.Register16
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_ [62]byte
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RAM_ADDR_RAND volatile.Register16
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_ [2]byte
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RAM_DATA_RAND volatile.Register16
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_ [126]byte
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CPU_MON_CTRL volatile.Register16
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_ [2]byte
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CPU_MON_FIRST volatile.Register32
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CPU_MON_LAST volatile.Register32
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_ [60]byte
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SYSTEM_RESET volatile.Register16
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_ [66]byte
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SPI_EN volatile.Register16
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_ [2]byte
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SPI_XFER volatile.Register16
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_ [2]byte
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SPI_DATA volatile.Register16
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}
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const (
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TK1_MMIO_TIMER_CTRL_START_BIT = 0
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TK1_MMIO_TIMER_CTRL_STOP_BIT = 1
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TK1_MMIO_TIMER_CTRL_START = 1 << TK1_MMIO_TIMER_CTRL_START_BIT
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TK1_MMIO_TIMER_CTRL_STOP = 1 << TK1_MMIO_TIMER_CTRL_STOP_BIT
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TK1_MMIO_TK1_LED_R_BIT = 2
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TK1_MMIO_TK1_LED_G_BIT = 1
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TK1_MMIO_TK1_LED_B_BIT = 0
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)

‎src/machine/machine_tkey.go‎

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//go:build tkey
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package machine
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import (
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"device/tkey"
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)
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const deviceName = "TKey"
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const (
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PinOutput PinMode = iota
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)
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var (
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LED_BLUE = Pin(tkey.TK1_MMIO_TK1_LED_B_BIT)
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LED_GREEN = Pin(tkey.TK1_MMIO_TK1_LED_G_BIT)
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LED_RED = Pin(tkey.TK1_MMIO_TK1_LED_R_BIT)
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LED = LED_GREEN
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)
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// No config needed for TKey, just to match the Pin interface.
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func (p Pin) Configure(config PinConfig) {
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}
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// Set GPIO pin to high or low.
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func (p Pin) Set(high bool) {
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switch p {
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case LED_BLUE, LED_GREEN, LED_RED:
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if high {
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tkey.TK1.LED.SetBits(1 << uint(p))
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} else {
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tkey.TK1.LED.ClearBits(1 << uint(p))
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}
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}
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}
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type UART struct {
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Bus *tkey.UART_Type
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Buffer *RingBuffer
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}
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var (
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UART0 = &_UART0
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_UART0 = UART{Bus: tkey.UART, Buffer: NewRingBuffer()}
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)
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func (uart *UART) Configure(config UARTConfig) {
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if config.BaudRate == 0 {
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config.BaudRate = 115200
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}
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uart.SetBaudRate(config.BaudRate)
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}
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func (uart *UART) SetBaudRate(br uint32) {
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uart.Bus.BIT_RATE.Set(uint16(18e6 / br))
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}
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func (uart *UART) writeByte(c byte) error {
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for uart.Bus.TX_STATUS.Get() == 0 {
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}
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uart.Bus.TX_DATA.Set(uint16(c))
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return nil
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}
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func (uart *UART) flush() {}

‎src/runtime/runtime_tkey.go‎

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//go:build tkey
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// This file implements target-specific things for the TKey.
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package runtime
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import (
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"machine"
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"runtime/volatile"
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)
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type timeUnit int64
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//export main
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func main() {
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preinit()
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initPeripherals()
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run()
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exit(0)
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}
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// initPeripherals configures peripherals the way the runtime expects them.
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func initPeripherals() {
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machine.InitSerial()
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}
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func putchar(c byte) {
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machine.Serial.WriteByte(c)
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}
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func getchar() byte {
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for machine.Serial.Buffered() == 0 {
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Gosched()
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}
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v, _ := machine.Serial.ReadByte()
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return v
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}
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func buffered() int {
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return machine.Serial.Buffered()
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}
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var timestamp volatile.Register32
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// ticks returns the current value of the timer in ticks.
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func ticks() timeUnit {
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return timeUnit(timestamp.Get())
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}
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// sleepTicks sleeps for at least the duration d.
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func sleepTicks(d timeUnit) {
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target := uint64(ticks() + d)
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for {
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if uint64(ticks()) >= target {
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break
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}
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timestamp.Set(timestamp.Get() + 1)
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}
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}

‎src/runtime/runtime_tkey_baremetal.go‎

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//go:build tkey && !qemu
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package runtime
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// ticksToNanoseconds converts ticks (at 18MHz) to nanoseconds.
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func ticksToNanoseconds(ticks timeUnit) int64 {
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return int64(ticks) * 1800
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}
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// nanosecondsToTicks converts nanoseconds to ticks (at 18MHz).
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func nanosecondsToTicks(ns int64) timeUnit {
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return timeUnit(ns / 1800)
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}
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func exit(code int) {
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abort()
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}
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func abort() {
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// lock up forever
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for {
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// TODO: something here?
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}
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}

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