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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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+#include "msp.h"
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+
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+/* Frequency of the external crystal oscillator */
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+#define XTAL_FREQUENCY 25000000UL
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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 USB0_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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+void board_init(void)
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+{
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+ /* Turn off power domains that unused peripherals belong to */
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+ SYSCTL->PCCAN = 0u;
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+#ifdef __MCU_HAS_LCD0__
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+ SYSCTL->PCLCD = 0u;
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+#endif
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+ SYSCTL->PCEMAC = 0u;
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+ SYSCTL->PCEPHY = 0u;
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+ SYSCTL->PCCCM = 0u;
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+
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+ /* --- Setup system clock --- */
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+ /* Start power-up process of the main oscillator */
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+ SYSCTL->MOSCCTL = SYSCTL_MOSCCTL_OSCRNG;
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+ while (!(SYSCTL->RIS & SYSCTL_RIS_MOSCPUPRIS)) ; /* Wait for completion */
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+ SYSCTL->MISC = SYSCTL_MISC_MOSCPUPMIS; /* Clear the completion interrupt status */
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+ /* Set the main oscillator to PLL reference clock */
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+ SYSCTL->RSCLKCFG = SYSCTL_RSCLKCFG_PLLSRC_MOSC;
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+ /* PLL freq. = (MOSC freq. / 10) * 96 = 240MHz */
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+ SYSCTL->PLLFREQ1 = (4 << SYSCTL_PLLFREQ1_N_S) | (1 << SYSCTL_PLLFREQ1_Q_S);
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+ SYSCTL->PLLFREQ0 = (96 << SYSCTL_PLLFREQ0_MINT_S) | SYSCTL_PLLFREQ0_PLLPWR;
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+ /* Set BCHT=6, BCE=0, WS=5 for 120MHz system clock */
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+ SYSCTL->MEMTIM0 = SYSCTL_MEMTIM0_EBCHT_3_5 | (5 << SYSCTL_MEMTIM0_EWS_S) |
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+ SYSCTL_MEMTIM0_FBCHT_3_5 | (5 << SYSCTL_MEMTIM0_FWS_S) | SYSCTL_MEMTIM0_MB1;
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+ /* Wait for completion of PLL power-up process */
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+ while (!(SYSCTL->RIS & SYSCTL_RIS_PLLLRIS)) ;
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+ SYSCTL->MISC = SYSCTL_MISC_PLLLMIS; /* Clear the completion interrupt status */
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+ /* Switch the system clock to PLL/4 */
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+ SYSCTL->RSCLKCFG = SYSCTL_RSCLKCFG_MEMTIMU | SYSCTL_RSCLKCFG_ACG |
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+ SYSCTL_RSCLKCFG_USEPLL | SYSCTL_RSCLKCFG_PLLSRC_MOSC | (1 << SYSCTL_RSCLKCFG_PSYSDIV_S);
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+
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+ SystemCoreClockUpdate();
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+#if CFG_TUSB_OS == OPT_OS_NONE
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+ SysTick_Config(SystemCoreClock / 1000);
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+#endif
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+
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+ /* USR_LED1 PN1 */
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+ SYSCTL->RCGCGPIO |= 1u << 12;
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+ while (!(SYSCTL->PRGPIO & (1u << 12))) ;
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+ GPION->DIR = 2u;
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+ GPION->DEN = 2u;
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+
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+ /* USR_SW1 PJ0 */
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+ SYSCTL->RCGCGPIO |= 1u << 8;
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+ while (!(SYSCTL->PRGPIO & (1u << 8))) ;
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+ GPIOJ->PUR = 1u;
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+ GPIOJ->DEN = 1u;
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+
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+ /* UART PA0,1 */
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+ SYSCTL->RCGCGPIO |= 1u << 0;
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+ while (!(SYSCTL->PRGPIO & (1u << 0))) ;
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+ GPIOA->AFSEL = 3u;
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+ GPIOA->PCTL = 0x11u;
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+ GPIOA->DEN = 3u;
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+
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+ SYSCTL->RCGCUART |= 1u << 0;
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+ while (!(SYSCTL->PRUART & (1u << 0))) ;
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+ UART0->CTL = 0;
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+ UART0->IBRD = 8; /* 8.68056 = 16MHz / (16 * 115200) */
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+ UART0->FBRD = 44; /* 0.6875 = 44/64 -> 115108bps (0.08%) */
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+ UART0->LCRH = UART_LCRH_WLEN_8 | UART_LCRH_FEN;
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+ UART0->CC = UART_CC_CS_PIOSC; /* Set the baud clock to PIOSC */
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+ UART0->CTL = UART_CTL_RXE | UART_CTL_TXE | UART_CTL_UARTEN;
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+
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+ /* USB PB1(VBUS) PL6,7(DP,DM) */
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+ SYSCTL->RCGCGPIO |= (1u << 1) | (1u << 10);
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+ while (((1u << 1) | (1u << 10)) != (SYSCTL->PRGPIO & ((1u << 1) | (1u << 10)))) ;
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+ GPIOB->AMSEL = 1u << 1;
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+ GPIOL->AMSEL = (1u << 6) | (1u << 7);
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+
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+ SYSCTL->RCGCUSB = 1u; /* Open the clock gate for SYSCLK */
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+ while (!(SYSCTL->PRUSB & (1u << 0))) ;
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+ USB0->CC = USB_CC_CLKEN | (3u << USB_CC_CLKDIV_S); /* 60MHz = 240MHz / 4 */
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+ __DMB(); /* Wait for completion of opening of the clock gate */
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+
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+ SYSCTL->SRUSB = 1u;
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+ for (int i = 0; i < 16; ++i) __NOP();
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+ SYSCTL->SRUSB = 0u;
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+
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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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+
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+void board_led_write(bool state)
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+{
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+ if (state)
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+ GPION->DATA |= 2u;
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+ else
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+ GPION->DATA &= ~2u;
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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 (GPIOJ->DATA & 1u) ? 0u : 1u;
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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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+ for (int i = 0; i < len; ++i) {
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+ while (UART0->FR & UART_FR_RXFE) ;
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+ *buf++ = UART0->DR;
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+ }
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+ return len;
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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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+ uint8_t const *p = (uint8_t const *)buf;
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+ for (int i = 0; i < len; ++i) {
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+ while (UART0->FR & UART_FR_TXFF) ;
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+ UART0->DR = *p++;
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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 = 0u;
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+void SysTick_Handler(void)
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+{
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+ system_ticks++;
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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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kkitayam