add circuitpython code

1 files changed, 139 insertions, 0 deletions

diff --git a/circuitpython/lib/tinyusb/hw/bsp/stm32l4/boards/stm32l476disco/board.h b/circuitpython/lib/tinyusb/hw/bsp/stm32l4/boards/stm32l476disco/board.h
new file mode 100644
index 0000000..42c657d
--- /dev/null
+++ b/circuitpython/lib/tinyusb/hw/bsp/stm32l4/boards/stm32l476disco/board.h
@@ -0,0 +1,139 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, 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.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define LED_PORT              GPIOB
+#define LED_PIN               GPIO_PIN_2
+#define LED_STATE_ON          1
+
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PIN_0
+#define BUTTON_STATE_ACTIVE   1
+
+#define UART_DEV              USART2
+#define UART_CLK_EN           __HAL_RCC_USART2_CLK_ENABLE
+#define UART_GPIO_PORT        GPIOD
+#define UART_GPIO_AF          GPIO_AF7_USART2
+#define UART_TX_PIN           GPIO_PIN_5
+#define UART_RX_PIN           GPIO_PIN_6
+
+//--------------------------------------------------------------------+
+// RCC Clock
+//--------------------------------------------------------------------+
+
+/**
+  * @brief  System Clock Configuration
+  *         The system Clock is configured as follow :
+  *
+  *         If define USB_USE_LSE_MSI_CLOCK enabled:
+  *            System Clock source            = PLL (MSI)
+  *            SYSCLK(Hz)                     = 80000000
+  *            HCLK(Hz)                       = 80000000
+  *            AHB Prescaler                  = 1
+  *            APB1 Prescaler                 = 1
+  *            APB2 Prescaler                 = 2
+  *            MSI Frequency(Hz)              = 4800000
+  *            LSE Frequency(Hz)              = 32768
+  *            PLL_M                          = 6
+  *            PLL_N                          = 40
+  *            PLL_P                          = 7
+  *            PLL_Q                          = 4
+  *            PLL_R                          = 4
+  *            Flash Latency(WS)              = 4
+  * @param  None
+  * @retval None
+  */
+static inline void board_clock_init(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+
+  /* Enable the LSE Oscillator */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
+  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Enable the CSS interrupt in case LSE signal is corrupted or not present */
+  HAL_RCCEx_DisableLSECSS();
+
+  /* Set tick interrupt priority, default HAL value is intentionally invalid
+     and that prevents PLL initialization in HAL_RCC_OscConfig() */
+  HAL_InitTick((1UL << __NVIC_PRIO_BITS) - 1UL);
+
+  /* Enable MSI Oscillator and activate PLL with MSI as source */
+  RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_MSI;
+  RCC_OscInitStruct.MSIState            = RCC_MSI_ON;
+  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
+  RCC_OscInitStruct.MSIClockRange       = RCC_MSIRANGE_11;
+  RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_MSI;
+  RCC_OscInitStruct.PLL.PLLM            = 6;
+  RCC_OscInitStruct.PLL.PLLN            = 40;
+  RCC_OscInitStruct.PLL.PLLP            = 7;
+  RCC_OscInitStruct.PLL.PLLQ            = 4;
+  RCC_OscInitStruct.PLL.PLLR            = 4;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /* Enable MSI Auto-calibration through LSE */
+  HAL_RCCEx_EnableMSIPLLMode();
+
+  /* Select MSI output as USB clock source */
+  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
+  PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_MSI;
+  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
+
+  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+  clocks dividers */
+  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4);
+}
+
+static inline void board_vbus_sense_init(void)
+{
+  // L476Disco use general GPIO PC11 for VBUS sensing instead of dedicated PA9 as others
+  // Disable VBUS Sense and force device mode
+  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
+
+  USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN | USB_OTG_GOTGCTL_BVALOVAL;
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */