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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2021, Koji Kitayama
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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 "bsp/board_api.h"
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#include "board.h"
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#include "interrupt_handlers.h"
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#define SYSTEM_PRCR_PRC1 (1<<1)
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#define SYSTEM_PRCR_PRKEY (0xA5u<<8)
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#define CMT_CMCR_CKS_DIV_128 2
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#define CMT_CMCR_CMIE (1<<6)
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#define IRQ_PRIORITY_CMT0 5
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#define IRQ_PRIORITY_USBI0 6
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#define SCI_SSR_FER (1<<4)
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#define SCI_SSR_ORER (1<<5)
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#define SCI_SCR_TEIE (1u<<2)
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#define SCI_SCR_RE (1u<<4)
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#define SCI_SCR_TE (1u<<5)
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#define SCI_SCR_RIE (1u<<6)
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#define SCI_SCR_TIE (1u<<7)
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// Board-specific pin/peripheral init (implemented per board)
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void board_pin_init(void);
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//--------------------------------------------------------------------+
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// SCI UART interrupt handlers
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//--------------------------------------------------------------------+
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typedef struct {
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uint8_t *buf;
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uint32_t cnt;
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} sci_buf_t;
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static volatile sci_buf_t sci_buf[2];
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void BOARD_SCI_TXI_HANDLER(void)
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{
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uint8_t *buf = sci_buf[0].buf;
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uint32_t cnt = sci_buf[0].cnt;
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if (!buf || !cnt) {
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BOARD_UART_SCI.SCR.BYTE &= ~(SCI_SCR_TEIE | SCI_SCR_TE | SCI_SCR_TIE);
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return;
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}
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BOARD_UART_SCI.TDR = *buf;
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if (--cnt) {
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++buf;
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} else {
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buf = NULL;
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BOARD_UART_SCI.SCR.BIT.TIE = 0;
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BOARD_UART_SCI.SCR.BIT.TEIE = 1;
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}
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sci_buf[0].buf = buf;
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sci_buf[0].cnt = cnt;
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}
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void BOARD_SCI_TEI_HANDLER(void)
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{
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BOARD_UART_SCI.SCR.BYTE &= ~(SCI_SCR_TEIE | SCI_SCR_TE | SCI_SCR_TIE);
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}
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void BOARD_SCI_RXI_HANDLER(void)
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{
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uint8_t *buf = sci_buf[1].buf;
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uint32_t cnt = sci_buf[1].cnt;
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if (!buf || !cnt ||
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(BOARD_UART_SCI.SSR.BYTE & (SCI_SSR_FER | SCI_SSR_ORER))) {
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sci_buf[1].buf = NULL;
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BOARD_UART_SCI.SSR.BYTE = 0;
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BOARD_UART_SCI.SCR.BYTE &= ~(SCI_SCR_RE | SCI_SCR_RIE);
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return;
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}
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*buf = BOARD_UART_SCI.RDR;
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if (--cnt) {
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++buf;
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} else {
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buf = NULL;
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BOARD_UART_SCI.SCR.BYTE &= ~(SCI_SCR_RE | SCI_SCR_RIE);
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}
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sci_buf[1].buf = buf;
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sci_buf[1].cnt = cnt;
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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 BOARD_USB_IRQ_HANDLER(void)
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{
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#if CFG_TUH_ENABLED
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tuh_int_handler(0, true);
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#endif
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#if CFG_TUD_ENABLED
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tud_int_handler(0);
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#endif
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}
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//--------------------------------------------------------------------+
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// Board init
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//--------------------------------------------------------------------+
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void board_init(void)
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{
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#if CFG_TUSB_OS == OPT_OS_NONE
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/* Enable CMT0 */
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SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY | SYSTEM_PRCR_PRC1;
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MSTP(CMT0) = 0;
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SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY;
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/* Setup 1ms tick timer */
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CMT0.CMCNT = 0;
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CMT0.CMCOR = BOARD_PCLK / 1000 / 128;
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CMT0.CMCR.WORD = CMT_CMCR_CMIE | CMT_CMCR_CKS_DIV_128;
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IR(CMT0, CMI0) = 0;
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IPR(CMT0, CMI0) = IRQ_PRIORITY_CMT0;
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IEN(CMT0, CMI0) = 1;
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CMT.CMSTR0.BIT.STR0 = 1;
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#endif
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/* Board-specific: pin mux, SCI, USB pin config */
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board_pin_init();
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/* Enable USB0 module */
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unsigned short oldPRCR = SYSTEM.PRCR.WORD;
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SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY | SYSTEM_PRCR_PRC1;
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MSTP(USB0) = 0;
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SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY | oldPRCR;
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/* USB IRQ */
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IR(USB0, USBI0) = 0;
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IPR(USB0, USBI0) = IRQ_PRIORITY_USBI0;
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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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BOARD_LED_WRITE(state);
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}
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uint32_t board_button_read(void)
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{
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return BOARD_BUTTON_READ();
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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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sci_buf[1].buf = buf;
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sci_buf[1].cnt = len;
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BOARD_UART_SCI.SCR.BYTE |= SCI_SCR_RE | SCI_SCR_RIE;
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while (BOARD_UART_SCI.SCR.BIT.RE) ;
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return len - sci_buf[1].cnt;
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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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sci_buf[0].buf = (uint8_t*)(uintptr_t) buf;
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sci_buf[0].cnt = len;
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BOARD_UART_SCI.SCR.BYTE |= SCI_SCR_TE | SCI_SCR_TIE;
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while (BOARD_UART_SCI.SCR.BIT.TE) ;
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return len;
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}
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//--------------------------------------------------------------------+
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// Tick timer
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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 INT_Excep_CMT0_CMI0(void)
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{
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++system_ticks;
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}
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uint32_t tusb_time_millis_api(void)
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{
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return system_ticks;
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}
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#else
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uint32_t SystemCoreClock = BOARD_CPUCLK;
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#endif
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//--------------------------------------------------------------------+
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// Newlib syscall stubs
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//--------------------------------------------------------------------+
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int close(int fd)
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{
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(void)fd;
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return -1;
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}
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int fstat(int fd, void *pstat)
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{
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(void)fd;
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(void)pstat;
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return 0;
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}
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off_t lseek(int fd, off_t pos, int whence)
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{
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(void)fd;
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(void)pos;
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(void)whence;
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return 0;
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}
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int isatty(int fd)
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{
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(void)fd;
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return 1;
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}
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