307 lines
9.7 KiB
C
307 lines
9.7 KiB
C
/*
|
||
* The MIT License (MIT)
|
||
*
|
||
* Copyright (c) 2021 Jean Gressmann <jean@0x42.de>
|
||
*
|
||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
* of this software and associated documentation files (the "Software"), to deal
|
||
* in the Software without restriction, including without limitation the rights
|
||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
* copies of the Software, and to permit persons to whom the Software is
|
||
* furnished to do so, subject to the following conditions:
|
||
*
|
||
* The above copyright notice and this permission notice shall be included in
|
||
* all copies or substantial portions of the Software.
|
||
*
|
||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
* THE SOFTWARE.
|
||
*
|
||
*/
|
||
|
||
#include <sam.h>
|
||
#include "bsp/board.h"
|
||
|
||
#include <hal/include/hal_gpio.h>
|
||
|
||
|
||
//--------------------------------------------------------------------+
|
||
// Forward USB interrupt events to TinyUSB IRQ Handler
|
||
//--------------------------------------------------------------------+
|
||
void USB_0_Handler(void)
|
||
{
|
||
tud_int_handler(0);
|
||
}
|
||
|
||
void USB_1_Handler(void)
|
||
{
|
||
tud_int_handler(0);
|
||
}
|
||
|
||
void USB_2_Handler(void)
|
||
{
|
||
tud_int_handler(0);
|
||
}
|
||
|
||
void USB_3_Handler(void)
|
||
{
|
||
tud_int_handler(0);
|
||
}
|
||
|
||
//--------------------------------------------------------------------+
|
||
// MACRO TYPEDEF CONSTANT ENUM DECLARATION
|
||
//--------------------------------------------------------------------+
|
||
#define LED_PIN PIN_PC18
|
||
#define BUTTON_PIN PIN_PB31
|
||
#define BOARD_SERCOM SERCOM2
|
||
|
||
/** Initializes the clocks from the external 12 MHz crystal
|
||
*
|
||
* The goal of this setup is to preserve the second PLL
|
||
* for the application code while still having a reasonable
|
||
* 48 MHz clock for USB / UART.
|
||
*
|
||
* GCLK0: CONF_CPU_FREQUENCY (default 120 MHz) from PLL0
|
||
* GCLK1: unused
|
||
* GCLK2: 12 MHz from XOSC1
|
||
* DFLL48M: closed loop from GLCK2
|
||
* GCLK3: 48 MHz
|
||
*/
|
||
static inline void init_clock_xtal(void)
|
||
{
|
||
/* configure for a 12MHz crystal connected to XIN1/XOUT1 */
|
||
OSCCTRL->XOSCCTRL[1].reg =
|
||
OSCCTRL_XOSCCTRL_STARTUP(6) | // 1.953 ms
|
||
OSCCTRL_XOSCCTRL_RUNSTDBY |
|
||
OSCCTRL_XOSCCTRL_ENALC |
|
||
OSCCTRL_XOSCCTRL_IMULT(4) | OSCCTRL_XOSCCTRL_IPTAT(3) | // 8MHz to 16MHz
|
||
OSCCTRL_XOSCCTRL_XTALEN |
|
||
OSCCTRL_XOSCCTRL_ENABLE;
|
||
while(0 == OSCCTRL->STATUS.bit.XOSCRDY1);
|
||
|
||
OSCCTRL->Dpll[0].DPLLCTRLB.reg = OSCCTRL_DPLLCTRLB_DIV(2) | OSCCTRL_DPLLCTRLB_REFCLK_XOSC1; /* 12MHz / 6 = 2Mhz, input = XOSC1 */
|
||
OSCCTRL->Dpll[0].DPLLRATIO.reg = OSCCTRL_DPLLRATIO_LDRFRAC(0x0) | OSCCTRL_DPLLRATIO_LDR((CONF_CPU_FREQUENCY / 1000000 / 2) - 1); /* multiply to get CONF_CPU_FREQUENCY (default = 120MHz) */
|
||
OSCCTRL->Dpll[0].DPLLCTRLA.reg = OSCCTRL_DPLLCTRLA_RUNSTDBY | OSCCTRL_DPLLCTRLA_ENABLE;
|
||
while(0 == OSCCTRL->Dpll[0].DPLLSTATUS.bit.CLKRDY); /* wait for the PLL0 to be ready */
|
||
|
||
/* configure clock-generator 0 to use DPLL0 as source -> GCLK0 is used for the core */
|
||
GCLK->GENCTRL[0].reg =
|
||
GCLK_GENCTRL_DIV(0) |
|
||
GCLK_GENCTRL_RUNSTDBY |
|
||
GCLK_GENCTRL_GENEN |
|
||
GCLK_GENCTRL_SRC_DPLL0 |
|
||
GCLK_GENCTRL_IDC;
|
||
while(1 == GCLK->SYNCBUSY.bit.GENCTRL0); /* wait for the synchronization between clock domains to be complete */
|
||
|
||
// configure GCLK2 for 12MHz from XOSC1
|
||
GCLK->GENCTRL[2].reg =
|
||
GCLK_GENCTRL_DIV(0) |
|
||
GCLK_GENCTRL_RUNSTDBY |
|
||
GCLK_GENCTRL_GENEN |
|
||
GCLK_GENCTRL_SRC_XOSC1 |
|
||
GCLK_GENCTRL_IDC;
|
||
while(1 == GCLK->SYNCBUSY.bit.GENCTRL2); /* wait for the synchronization between clock domains to be complete */
|
||
|
||
/* setup DFLL48M to use GLCK2 */
|
||
GCLK->PCHCTRL[OSCCTRL_GCLK_ID_DFLL48].reg = GCLK_PCHCTRL_GEN_GCLK2 | GCLK_PCHCTRL_CHEN;
|
||
|
||
OSCCTRL->DFLLCTRLA.reg = 0;
|
||
while(1 == OSCCTRL->DFLLSYNC.bit.ENABLE);
|
||
|
||
OSCCTRL->DFLLCTRLB.reg = OSCCTRL_DFLLCTRLB_MODE | OSCCTRL_DFLLCTRLB_WAITLOCK;
|
||
OSCCTRL->DFLLMUL.bit.MUL = 4; // 4 * 12MHz -> 48MHz
|
||
|
||
OSCCTRL->DFLLCTRLA.reg =
|
||
OSCCTRL_DFLLCTRLA_ENABLE |
|
||
OSCCTRL_DFLLCTRLA_RUNSTDBY;
|
||
while(1 == OSCCTRL->DFLLSYNC.bit.ENABLE);
|
||
|
||
// setup 48 MHz GCLK3 from DFLL48M
|
||
GCLK->GENCTRL[3].reg =
|
||
GCLK_GENCTRL_DIV(0) |
|
||
GCLK_GENCTRL_RUNSTDBY |
|
||
GCLK_GENCTRL_GENEN |
|
||
GCLK_GENCTRL_SRC_DFLL |
|
||
GCLK_GENCTRL_IDC;
|
||
while(1 == GCLK->SYNCBUSY.bit.GENCTRL3);
|
||
}
|
||
|
||
/* Initialize SERCOM2 for 115200 bps 8N1 using a 48 MHz clock */
|
||
static inline void uart_init(void)
|
||
{
|
||
gpio_set_pin_function(PIN_PB24, PINMUX_PB24D_SERCOM2_PAD1);
|
||
gpio_set_pin_function(PIN_PB25, PINMUX_PB25D_SERCOM2_PAD0);
|
||
|
||
MCLK->APBBMASK.bit.SERCOM2_ = 1;
|
||
GCLK->PCHCTRL[SERCOM2_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN_GCLK0 | GCLK_PCHCTRL_CHEN;
|
||
|
||
BOARD_SERCOM->USART.CTRLA.bit.SWRST = 1; /* reset and disable SERCOM -> enable configuration */
|
||
while (BOARD_SERCOM->USART.SYNCBUSY.bit.SWRST);
|
||
|
||
BOARD_SERCOM->USART.CTRLA.reg =
|
||
SERCOM_USART_CTRLA_SAMPR(0) | /* 0 = 16x / arithmetic baud rate, 1 = 16x / fractional baud rate */
|
||
SERCOM_USART_CTRLA_SAMPA(0) | /* 16x over sampling */
|
||
SERCOM_USART_CTRLA_FORM(0) | /* 0x0 USART frame, 0x1 USART frame with parity, ... */
|
||
SERCOM_USART_CTRLA_DORD | /* LSB first */
|
||
SERCOM_USART_CTRLA_MODE(1) | /* 0x0 USART with external clock, 0x1 USART with internal clock */
|
||
SERCOM_USART_CTRLA_RXPO(1) | /* SERCOM PAD[1] is used for data reception */
|
||
SERCOM_USART_CTRLA_TXPO(0); /* SERCOM PAD[0] is used for data transmission */
|
||
|
||
BOARD_SERCOM->USART.CTRLB.reg = /* RXEM = 0 -> receiver disabled, LINCMD = 0 -> normal USART transmission, SFDE = 0 -> start-of-frame detection disabled, SBMODE = 0 -> one stop bit, CHSIZE = 0 -> 8 bits */
|
||
SERCOM_USART_CTRLB_TXEN | /* transmitter enabled */
|
||
SERCOM_USART_CTRLB_RXEN; /* receiver enabled */
|
||
// BOARD_SERCOM->USART.BAUD.reg = SERCOM_USART_BAUD_FRAC_FP(0) | SERCOM_USART_BAUD_FRAC_BAUD(26); /* 48000000/(16*115200) = 26.041666667 */
|
||
BOARD_SERCOM->USART.BAUD.reg = SERCOM_USART_BAUD_BAUD(63019); /* 65536*(1−16*115200/48000000) */
|
||
|
||
BOARD_SERCOM->USART.CTRLA.bit.ENABLE = 1; /* activate SERCOM */
|
||
while (BOARD_SERCOM->USART.SYNCBUSY.bit.ENABLE); /* wait for SERCOM to be ready */
|
||
}
|
||
|
||
static inline void uart_send_buffer(uint8_t const *text, size_t len)
|
||
{
|
||
for (size_t i = 0; i < len; ++i) {
|
||
BOARD_SERCOM->USART.DATA.reg = text[i];
|
||
while((BOARD_SERCOM->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
|
||
}
|
||
}
|
||
|
||
static inline void uart_send_str(const char* text)
|
||
{
|
||
while (*text) {
|
||
BOARD_SERCOM->USART.DATA.reg = *text++;
|
||
while((BOARD_SERCOM->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
|
||
}
|
||
}
|
||
|
||
|
||
void board_init(void)
|
||
{
|
||
// Uncomment this line and change the GCLK for UART/USB to run off the XTAL.
|
||
// init_clock_xtal();
|
||
|
||
SystemCoreClock = CONF_CPU_FREQUENCY;
|
||
|
||
#if CFG_TUSB_OS == OPT_OS_NONE
|
||
SysTick_Config(CONF_CPU_FREQUENCY / 1000);
|
||
#endif
|
||
|
||
uart_init();
|
||
|
||
#if CFG_TUSB_DEBUG >= 2
|
||
uart_send_str(BOARD_NAME " UART initialized\n");
|
||
tu_printf(BOARD_NAME " reset cause %#02x\n", RSTC->RCAUSE.reg);
|
||
#endif
|
||
|
||
// LED0 init
|
||
gpio_set_pin_function(LED_PIN, GPIO_PIN_FUNCTION_OFF);
|
||
gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
|
||
board_led_write(0);
|
||
|
||
#if CFG_TUSB_DEBUG >= 2
|
||
uart_send_str(BOARD_NAME " LED pin configured\n");
|
||
#endif
|
||
|
||
// BTN0 init
|
||
gpio_set_pin_function(BUTTON_PIN, GPIO_PIN_FUNCTION_OFF);
|
||
gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
|
||
gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
|
||
|
||
#if CFG_TUSB_DEBUG >= 2
|
||
uart_send_str(BOARD_NAME " Button pin configured\n");
|
||
#endif
|
||
|
||
#if CFG_TUSB_OS == OPT_OS_FREERTOS
|
||
// If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
|
||
NVIC_SetPriority(USB_0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
|
||
NVIC_SetPriority(USB_1_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
|
||
NVIC_SetPriority(USB_2_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
|
||
NVIC_SetPriority(USB_3_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
|
||
#endif
|
||
|
||
|
||
#if TUSB_OPT_DEVICE_ENABLED
|
||
#if CFG_TUSB_DEBUG >= 2
|
||
uart_send_str(BOARD_NAME " USB device enabled\n");
|
||
#endif
|
||
|
||
/* USB clock init
|
||
* The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
|
||
* for low speed and full speed operation.
|
||
*/
|
||
hri_gclk_write_PCHCTRL_reg(GCLK, USB_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK0_Val | GCLK_PCHCTRL_CHEN);
|
||
hri_mclk_set_AHBMASK_USB_bit(MCLK);
|
||
hri_mclk_set_APBBMASK_USB_bit(MCLK);
|
||
|
||
// USB pin init
|
||
gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
|
||
gpio_set_pin_level(PIN_PA24, false);
|
||
gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
|
||
gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
|
||
gpio_set_pin_level(PIN_PA25, false);
|
||
gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
|
||
|
||
gpio_set_pin_function(PIN_PA24, PINMUX_PA24H_USB_DM);
|
||
gpio_set_pin_function(PIN_PA25, PINMUX_PA25H_USB_DP);
|
||
|
||
|
||
#if CFG_TUSB_DEBUG >= 2
|
||
uart_send_str(BOARD_NAME " USB device configured\n");
|
||
#endif
|
||
#endif
|
||
}
|
||
|
||
//--------------------------------------------------------------------+
|
||
// Board porting API
|
||
//--------------------------------------------------------------------+
|
||
|
||
void board_led_write(bool state)
|
||
{
|
||
gpio_set_pin_level(LED_PIN, !state);
|
||
}
|
||
|
||
uint32_t board_button_read(void)
|
||
{
|
||
return (PORT->Group[1].IN.reg & 0x80000000) != 0x80000000;
|
||
}
|
||
|
||
int board_uart_read(uint8_t* buf, int len)
|
||
{
|
||
(void) buf; (void) len;
|
||
return 0;
|
||
}
|
||
|
||
int board_uart_write(void const * buf, int len)
|
||
{
|
||
if (len < 0) {
|
||
uart_send_str(buf);
|
||
} else {
|
||
uart_send_buffer(buf, len);
|
||
}
|
||
return len;
|
||
}
|
||
|
||
#if CFG_TUSB_OS == OPT_OS_NONE
|
||
volatile uint32_t system_ticks = 0;
|
||
|
||
void SysTick_Handler(void)
|
||
{
|
||
system_ticks++;
|
||
}
|
||
|
||
uint32_t board_millis(void)
|
||
{
|
||
return system_ticks;
|
||
}
|
||
#endif
|
||
|
||
// Required by __libc_init_array in startup code if we are compiling using
|
||
// -nostdlib/-nostartfiles.
|
||
void _init(void)
|
||
{
|
||
|
||
}
|