1 files changed, 249 insertions, 0 deletions
diff --git a/circuitpython/lib/tinyusb/hw/bsp/samd21/family.c b/circuitpython/lib/tinyusb/hw/bsp/samd21/family.c
new file mode 100644
index 0000000..494dc39
--- /dev/null
+++ b/circuitpython/lib/tinyusb/hw/bsp/samd21/family.c
@@ -0,0 +1,249 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * 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.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include "sam.h"
+#include "bsp/board.h"
+#include "board.h"
+
+#include "hal/include/hal_gpio.h"
+#include "hal/include/hal_init.h"
+#include "hri/hri_nvmctrl_d21.h"
+
+#include "hpl/gclk/hpl_gclk_base.h"
+#include "hpl_pm_config.h"
+#include "hpl/pm/hpl_pm_base.h"
+
+//--------------------------------------------------------------------+
+// Forward USB interrupt events to TinyUSB IRQ Handler
+//--------------------------------------------------------------------+
+void USB_Handler(void)
+{
+  tud_int_handler(0);
+}
+
+//--------------------------------------------------------------------+
+// UART support
+//--------------------------------------------------------------------+
+static void uart_init(void);
+
+//--------------------------------------------------------------------+
+// MACRO TYPEDEF CONSTANT ENUM DECLARATION
+//--------------------------------------------------------------------+
+
+/* Referenced GCLKs, should be initialized firstly */
+#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
+
+/* Not referenced GCLKs, initialized last */
+#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
+
+void board_init(void)
+{
+  // Clock init ( follow hpl_init.c )
+  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
+
+  _pm_init();
+  _sysctrl_init_sources();
+#if _GCLK_INIT_1ST
+  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
+#endif
+  _sysctrl_init_referenced_generators();
+  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);
+
+  // Update SystemCoreClock since it is hard coded with asf4 and not correct
+  // Init 1ms tick timer (samd SystemCoreClock may not correct)
+  SystemCoreClock = CONF_CPU_FREQUENCY;
+#if CFG_TUSB_OS  == OPT_OS_NONE
+  SysTick_Config(CONF_CPU_FREQUENCY / 1000);
+#endif
+
+  // Led init
+#ifdef LED_PIN
+  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
+  board_led_write(false);
+#endif
+
+  // Button init
+#ifdef BUTTON_PIN
+  gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
+  gpio_set_pin_pull_mode(BUTTON_PIN, BUTTON_STATE_ACTIVE ? GPIO_PULL_DOWN : GPIO_PULL_UP);
+#endif
+
+  uart_init();
+
+#if CFG_TUSB_OS  == OPT_OS_FREERTOS
+  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
+  NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
+#endif
+
+  /* USB Clock init
+   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
+   * for low speed and full speed operation. */
+  _pm_enable_bus_clock(PM_BUS_APBB, USB);
+  _pm_enable_bus_clock(PM_BUS_AHB, USB);
+  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
+
+  // 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_PA24G_USB_DM);
+  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
+
+  // Output 500hz PWM on D12 (PA19 - TCC0 WO[3]) so we can validate the GCLK0 clock speed with a Saleae.
+  _pm_enable_bus_clock(PM_BUS_APBC, TCC0);
+  TCC0->PER.bit.PER = 48000000 / 1000;
+  TCC0->CC[3].bit.CC = 48000000 / 2000;
+  TCC0->CTRLA.bit.ENABLE = true;
+
+  gpio_set_pin_function(PIN_PA19, PINMUX_PA19F_TCC0_WO3);
+  _gclk_enable_channel(TCC0_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
+}
+
+//--------------------------------------------------------------------+
+// Board porting API
+//--------------------------------------------------------------------+
+
+void board_led_write(bool state)
+{
+  (void)state;
+#ifdef LED_PIN
+  gpio_set_pin_level(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+#endif
+}
+
+uint32_t board_button_read(void)
+{
+#ifdef BUTTON_PIN
+  return BUTTON_STATE_ACTIVE == gpio_get_pin_level(BUTTON_PIN);
+#else
+  return 0;
+#endif
+}
+
+#if defined(UART_SERCOM)
+
+#define BOARD_SERCOM2(n)  SERCOM ## n
+#define BOARD_SERCOM(n) BOARD_SERCOM2(n)
+
+static void uart_init(void)
+{
+#if UART_SERCOM == 0
+  gpio_set_pin_function(PIN_PA06, PINMUX_PA06D_SERCOM0_PAD2);
+  gpio_set_pin_function(PIN_PA07, PINMUX_PA07D_SERCOM0_PAD3);
+
+  // setup clock (48MHz)
+  _pm_enable_bus_clock(PM_BUS_APBC, SERCOM0);
+  _gclk_enable_channel(SERCOM0_GCLK_ID_CORE, GCLK_CLKCTRL_GEN_GCLK0_Val);
+
+  SERCOM0->USART.CTRLA.bit.SWRST = 1; /* reset SERCOM & enable config */
+  while(SERCOM0->USART.SYNCBUSY.bit.SWRST);
+
+  SERCOM0->USART.CTRLA.reg  =  /* CMODE = 0 -> async, SAMPA = 0, FORM = 0 -> USART frame, SMPR = 0 -> arithmetic baud rate */
+    SERCOM_USART_CTRLA_SAMPR(1) | /* 0 = 16x / arithmetic baud rate, 1 = 16x / fractional baud rate */
+//    SERCOM_USART_CTRLA_FORM(0) | /* 0 = USART Frame, 2 = LIN Master */
+    SERCOM_USART_CTRLA_DORD | /* LSB first */
+    SERCOM_USART_CTRLA_MODE(1) | /* 0 = Asynchronous, 1 = USART with internal clock */
+    SERCOM_USART_CTRLA_RXPO(3) | /* pad 3 */
+    SERCOM_USART_CTRLA_TXPO(1);  /* pad 2 */
+
+  SERCOM0->USART.CTRLB.reg =
+    SERCOM_USART_CTRLB_TXEN | /* tx enabled */
+    SERCOM_USART_CTRLB_RXEN;  /* rx enabled */
+
+  SERCOM0->USART.BAUD.reg = SERCOM_USART_BAUD_FRAC_FP(0) | SERCOM_USART_BAUD_FRAC_BAUD(26);
+
+  SERCOM0->USART.CTRLA.bit.ENABLE = 1; /* activate SERCOM */
+  while(SERCOM0->USART.SYNCBUSY.bit.ENABLE); /* wait for SERCOM to be ready */
+#endif
+}
+
+static inline void uart_send_buffer(uint8_t const *text, size_t len)
+{
+  for (size_t i = 0; i < len; ++i) {
+    BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = text[i];
+    while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
+  }
+}
+
+static inline void uart_send_str(const char* text)
+{
+  while (*text) {
+    BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = *text++;
+    while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
+  }
+}
+
+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;
+}
+
+#else // ! defined(UART_SERCOM)
+static void uart_init(void)
+{
+
+}
+
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+#endif
+
+#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