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+/*
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+ * The MIT License (MIT)
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+ *
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+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ * THE SOFTWARE.
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+ *
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+ * This file is part of the TinyUSB stack.
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+ */
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+
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+#include "bsp/board.h"
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+#include "board.h"
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+
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+#include "broadcom/cpu.h"
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+#include "broadcom/gpio.h"
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+#include "broadcom/interrupts.h"
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+#include "broadcom/mmu.h"
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+#include "broadcom/caches.h"
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+#include "broadcom/vcmailbox.h"
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+
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+// LED
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+#define LED_PIN 18
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+#define LED_STATE_ON 1
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+
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+// UART TX
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+#define UART_TX_PIN 14
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+
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+//--------------------------------------------------------------------+
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+// Forward USB interrupt events to TinyUSB IRQ Handler
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+//--------------------------------------------------------------------+
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+void USB_IRQHandler(void)
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+{
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+ tud_int_handler(0);
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+}
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+
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+//--------------------------------------------------------------------+
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+// MACRO TYPEDEF CONSTANT ENUM
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+//--------------------------------------------------------------------+
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+
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+//--------------------------------------------------------------------+
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+// Board porting API
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+//--------------------------------------------------------------------+
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+void board_init(void)
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+{
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+ setup_mmu_flat_map();
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+ init_caches();
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+
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+ // LED
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+ gpio_set_function(LED_PIN, GPIO_FUNCTION_OUTPUT);
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+ gpio_set_pull(LED_PIN, BP_PULL_NONE);
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+ board_led_write(true);
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+
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+ // Uart
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+ COMPLETE_MEMORY_READS;
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+ AUX->ENABLES_b.UART_1 = true;
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+
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+ UART1->IER = 0;
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+ UART1->CNTL = 0;
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+ UART1->LCR_b.DATA_SIZE = UART1_LCR_DATA_SIZE_MODE_8BIT;
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+ UART1->MCR = 0;
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+ UART1->IER = 0;
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+
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+ uint32_t source_clock = vcmailbox_get_clock_rate_measured(VCMAILBOX_CLOCK_CORE);
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+ UART1->BAUD = ((source_clock / (115200 * 8)) - 1);
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+ UART1->CNTL |= UART1_CNTL_TX_ENABLE_Msk;
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+ COMPLETE_MEMORY_READS;
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+
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+ gpio_set_function(UART_TX_PIN, GPIO_FUNCTION_ALT5);
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+
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+ // Turn on USB peripheral.
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+ vcmailbox_set_power_state(VCMAILBOX_DEVICE_USB_HCD, true);
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+
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+ // Timer 1/1024 second tick
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+ SYSTMR->CS_b.M1 = 1;
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+ SYSTMR->C1 = SYSTMR->CLO + 977;
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+ BP_EnableIRQ(TIMER_1_IRQn);
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+
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+ BP_SetPriority(USB_IRQn, 0x00);
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+ BP_ClearPendingIRQ(USB_IRQn);
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+ BP_EnableIRQ(USB_IRQn);
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+ BP_EnableIRQs();
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+}
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+
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+void board_led_write(bool state)
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+{
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+ gpio_set_value(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
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+}
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+
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+uint32_t board_button_read(void)
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+{
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+ return 0;
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+}
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+
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+int board_uart_read(uint8_t* buf, int len)
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+{
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+ (void) buf; (void) len;
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+ return 0;
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+}
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+
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+int board_uart_write(void const * buf, int len)
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+{
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+ for (int i = 0; i < len; i++) {
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+ const char* cbuf = buf;
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+ while (!UART1->STAT_b.TX_READY) {}
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+ if (cbuf[i] == '\n') {
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+ UART1->IO = '\r';
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+ while (!UART1->STAT_b.TX_READY) {}
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+ }
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+ UART1->IO = cbuf[i];
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+ }
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+ return len;
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+}
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+
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+#if CFG_TUSB_OS == OPT_OS_NONE
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+volatile uint32_t system_ticks = 0;
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+
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+void TIMER_1_IRQHandler(void)
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+{
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+ system_ticks++;
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+ SYSTMR->C1 += 977;
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+ SYSTMR->CS_b.M1 = 1;
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+}
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+
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+uint32_t board_millis(void)
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+{
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+ return system_ticks;
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+}
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+#endif
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+
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+void HardFault_Handler (void)
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+{
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+ // asm("bkpt");
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+}
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+
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+// Required by __libc_init_array in startup code if we are compiling using
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+// -nostdlib/-nostartfiles.
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+void _init(void)
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+{
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+
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+}
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Scott Shawcroft