209 lines
6.4 KiB
C
209 lines
6.4 KiB
C
/*
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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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#include "chip.h"
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#include "../board.h"
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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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// MACRO TYPEDEF CONSTANT ENUM
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//--------------------------------------------------------------------+
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#define LED_PORT 1
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#define LED_PIN 24
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#define LED_STATE_ON 0
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// Wake up Switch
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#define BUTTON_PORT 0
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#define BUTTON_PIN 16
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#define BUTTON_STATE_ACTIVE 0
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/* System oscillator rate and RTC oscillator rate */
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const uint32_t OscRateIn = 12000000;
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const uint32_t ExtRateIn = 0;
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/* Pin muxing table, only items that need changing from their default pin
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state are in this table. Not every pin is mapped. */
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/* IOCON pin definitions for pin muxing */
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typedef struct {
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uint32_t port : 8; /* Pin port */
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uint32_t pin : 8; /* Pin number */
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uint32_t modefunc : 16; /* Function and mode */
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} PINMUX_GRP_T;
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static const PINMUX_GRP_T pinmuxing[] =
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{
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{0, 3, (IOCON_FUNC1 | IOCON_MODE_INACT | IOCON_DIGMODE_EN)}, // USB VBUS
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{0, 6, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_6 used for USB_CONNECT */
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{0, 18, (IOCON_FUNC1 | IOCON_MODE_INACT | IOCON_DIGMODE_EN)}, // UART0 RX
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{0, 19, (IOCON_FUNC1 | IOCON_MODE_INACT | IOCON_DIGMODE_EN)}, // UART0 TX
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};
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/* Setup system clocking */
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static void SystemSetupClocking(void)
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{
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volatile int i;
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/* Powerup main oscillator */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSOSC_PD);
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/* Wait 200us for OSC to be stablized, no status
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indication, dummy wait. */
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for (i = 0; i < 0x100; i++) {}
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/* Set system PLL input to main oscillator */
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Chip_Clock_SetSystemPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
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/* Power down PLL to change the PLL divider ratio */
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Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_SYSPLL_PD);
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/* Setup PLL for main oscillator rate (FCLKIN = 12MHz) * 4 = 48MHz
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MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2)
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FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz
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FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */
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Chip_Clock_SetupSystemPLL(3, 1);
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/* Powerup system PLL */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSPLL_PD);
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/* Wait for PLL to lock */
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while (!Chip_Clock_IsSystemPLLLocked()) {}
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/* Set system clock divider to 1 */
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Chip_Clock_SetSysClockDiv(1);
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/* Setup FLASH access to 3 clocks */
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Chip_FMC_SetFLASHAccess(FLASHTIM_50MHZ_CPU);
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/* Set main clock source to the system PLL. This will drive 48MHz
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for the main clock and 48MHz for the system clock */
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Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_PLLOUT);
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/* Set USB PLL input to main oscillator */
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Chip_Clock_SetUSBPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
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/* Setup USB PLL (FCLKIN = 12MHz) * 4 = 48MHz
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MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2)
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FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz
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FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */
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Chip_Clock_SetupUSBPLL(3, 1);
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/* Powerup USB PLL */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPLL_PD);
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/* Wait for PLL to lock */
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while (!Chip_Clock_IsUSBPLLLocked()) {}
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}
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// Invoked by startup code
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void SystemInit(void)
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{
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SystemSetupClocking();
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_RAM1);
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/* Enable IOCON clock */
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
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for (uint32_t i = 0; i < (sizeof(pinmuxing) / sizeof(PINMUX_GRP_T)); i++)
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{
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Chip_IOCON_PinMuxSet(LPC_IOCON, pinmuxing[i].port, pinmuxing[i].pin, pinmuxing[i].modefunc);
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}
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}
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void board_init(void)
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{
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SystemCoreClockUpdate();
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#if CFG_TUSB_OS == OPT_OS_NONE
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// 1ms tick timer
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SysTick_Config(SystemCoreClock / 1000);
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#elif CFG_TUSB_OS == OPT_OS_FREERTOS
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// If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
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NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
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#endif
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Chip_GPIO_Init(LPC_GPIO);
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// LED
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Chip_GPIO_SetPinDIROutput(LPC_GPIO, LED_PORT, LED_PIN);
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// Button
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Chip_GPIO_SetPinDIRInput(LPC_GPIO, BUTTON_PORT, BUTTON_PIN);
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// USB: Setup PLL clock, and power
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/* enable USB main clock */
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Chip_Clock_SetUSBClockSource(SYSCTL_USBCLKSRC_PLLOUT, 1);
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/* Enable AHB clock to the USB block and USB RAM. */
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USB);
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USBRAM);
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/* power UP USB Phy */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPAD_PD);
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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_led_write(bool state)
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{
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Chip_GPIO_SetPinState(LPC_GPIO, LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
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}
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uint32_t board_button_read(void)
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{
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return BUTTON_STATE_ACTIVE == Chip_GPIO_GetPinState(LPC_GPIO, BUTTON_PORT, BUTTON_PIN);
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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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int board_uart_write(void const * 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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#if CFG_TUSB_OS == OPT_OS_NONE
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volatile uint32_t system_ticks = 0;
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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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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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