stm32: Add support for USB on G0 MCUs.

Signed-off-by: Damien George <damien@micropython.org>

ports/stm32/boards/stm32g0xx_hal_conf_base.h

@@ -27,16 +27,42 @@
 #ifndef MICROPY_INCLUDED_STM32G0XX_HAL_CONF_BASE_H
 #define MICROPY_INCLUDED_STM32G0XX_HAL_CONF_BASE_H
 
+// Enable various HAL modules
+#define HAL_MODULE_ENABLED
+#define HAL_ADC_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_PCD_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_RTC_MODULE_ENABLED
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED
+#define HAL_USART_MODULE_ENABLED
+
 // Oscillator values in Hz
-// These must come before the HAL headers because stm32g0xx_ll_rcc.h will define HSI_VALUE unless already defined
 #define HSI_VALUE    (16000000)
 #define LSI_VALUE    (32000)
 #if defined(STM32G0C1xx) || defined(STM32G0B1xx) || defined(STM32G0B0xx)
 #define HSI48_VALUE   48000000
 #endif
 
-// Include various HAL modules for convenience
+// SysTick has the highest priority
+#define TICK_INT_PRIORITY (0x00)
 
+// Miscellaneous HAL settings
+#define  USE_RTOS                     0
+#define  PREFETCH_ENABLE              1
+#define  INSTRUCTION_CACHE_ENABLE     1
+#define  USE_SPI_CRC                  1
+#define  USE_HAL_CRYP_SUSPEND_RESUME  1
+
+// Include various HAL modules for convenience
 #include "stm32g0xx_hal_rcc.h"
 #include "stm32g0xx_hal_gpio.h"
 #include "stm32g0xx_hal_dma.h"
@@ -68,38 +94,10 @@
 #include "stm32g0xx_hal_uart.h"
 #include "stm32g0xx_hal_usart.h"
 #include "stm32g0xx_hal_wwdg.h"
-
 #include "stm32g0xx_ll_lpuart.h"
 #include "stm32g0xx_ll_rtc.h"
 #include "stm32g0xx_ll_usart.h"
 
-// Enable various HAL modules
-#define HAL_MODULE_ENABLED
-#define HAL_ADC_MODULE_ENABLED
-#define HAL_CORTEX_MODULE_ENABLED
-#define HAL_DMA_MODULE_ENABLED
-#define HAL_EXTI_MODULE_ENABLED
-#define HAL_FLASH_MODULE_ENABLED
-#define HAL_GPIO_MODULE_ENABLED
-#define HAL_I2C_MODULE_ENABLED
-#define HAL_PWR_MODULE_ENABLED
-#define HAL_RCC_MODULE_ENABLED
-#define HAL_RTC_MODULE_ENABLED
-#define HAL_SPI_MODULE_ENABLED
-#define HAL_TIM_MODULE_ENABLED
-#define HAL_UART_MODULE_ENABLED
-#define HAL_USART_MODULE_ENABLED
-
-// SysTick has the highest priority
-#define TICK_INT_PRIORITY (0x00)
-
-// Miscellaneous HAL settings
-#define  USE_RTOS                     0
-#define  PREFETCH_ENABLE              1
-#define  INSTRUCTION_CACHE_ENABLE     1
-#define  USE_SPI_CRC                  1
-#define  USE_HAL_CRYP_SUSPEND_RESUME  1
-
 // HAL parameter assertions are disabled
 #define assert_param(expr) ((void)0)
 

ports/stm32/powerctrlboot.c

@@ -173,15 +173,14 @@ void SystemClock_Config(void) {
 
     #if MICROPY_HW_ENABLE_RNG || MICROPY_HW_ENABLE_USB
     // Enable the 48MHz internal oscillator
-    RCC->CRRCR |= RCC_CRRCR_HSI48ON;
+    RCC->CR |= RCC_CR_HSI48ON;
-    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
+    RCC->APBENR2 |= RCC_APBENR2_SYSCFGEN;
-    SYSCFG->CFGR3 |= SYSCFG_CFGR3_ENREF_HSI48;
+    while (!(RCC->CR & RCC_CR_HSI48RDY)) {
-    while (!(RCC->CRRCR & RCC_CRRCR_HSI48RDY)) {
         // Wait for HSI48 to be ready
     }
 
-    // Select RC48 as HSI48 for USB and RNG
+    // Select HSI48 for USB
-    RCC->CCIPR |= RCC_CCIPR_HSI48SEL;
+    RCC->CCIPR2 &= ~(3 << RCC_CCIPR2_USBSEL_Pos);
 
     #if MICROPY_HW_ENABLE_USB
     // Synchronise HSI48 with 1kHz USB SoF

ports/stm32/stm32_it.c

@@ -296,7 +296,15 @@ void DebugMon_Handler(void) {
 /*  file (startup_stm32f4xx.s).                                               */
 /******************************************************************************/
 
-#if defined(STM32L0) || defined(STM32L432xx)
+#if defined(STM32G0)
+
+#if MICROPY_HW_USB_FS
+void USB_UCPD1_2_IRQHandler(void) {
+    HAL_PCD_IRQHandler(&pcd_fs_handle);
+}
+#endif
+
+#elif defined(STM32L0) || defined(STM32L432xx)
 
 #if MICROPY_HW_USB_FS
 void USB_IRQHandler(void) {

ports/stm32/usb.c

@@ -67,7 +67,7 @@
 #define MAX_ENDPOINT(dev_id) ((dev_id) == USB_PHY_FS_ID ? 3 : 5)
 #elif defined(STM32F7)
 #define MAX_ENDPOINT(dev_id) ((dev_id) == USB_PHY_FS_ID ? 5 : 8)
-#elif defined(STM32H7)
+#elif defined(STM32G0) || defined(STM32H7)
 #define MAX_ENDPOINT(dev_id) (8)
 #endif
 

ports/stm32/usbd_cdc_interface.c

@@ -50,6 +50,15 @@
 
 #if MICROPY_HW_ENABLE_USB
 
+#if !MICROPY_HW_USB_IS_MULTI_OTG
+#define USE_USB_CNTR_SOFM (1)
+#elif defined(STM32G0)
+#define USE_USB_CNTR_SOFM (1)
+#define USB USB_DRD_FS
+#else
+#define USE_USB_CNTR_SOFM (0)
+#endif
+
 // CDC control commands
 #define CDC_SEND_ENCAPSULATED_COMMAND               0x00
 #define CDC_GET_ENCAPSULATED_RESPONSE               0x01
@@ -152,7 +161,7 @@ int8_t usbd_cdc_control(usbd_cdc_state_t *cdc_in, uint8_t cmd, uint8_t *pbuf, ui
                 // configure its serial port (in most cases to disable local echo)
                 cdc->connect_state = USBD_CDC_CONNECT_STATE_CONNECTING;
                 usbd_cdc_connect_tx_timer = 8; // wait for 8 SOF IRQs
-                #if !MICROPY_HW_USB_IS_MULTI_OTG
+                #if USE_USB_CNTR_SOFM
                 USB->CNTR |= USB_CNTR_SOFM;
                 #else
                 PCD_HandleTypeDef *hpcd = cdc->base.usbd->pdev->pData;
@@ -263,7 +272,7 @@ void HAL_PCD_SOFCallback(PCD_HandleTypeDef *hpcd) {
         --usbd_cdc_connect_tx_timer;
     } else {
         usbd_cdc_msc_hid_state_t *usbd = ((USBD_HandleTypeDef *)hpcd->pData)->pClassData;
-        #if !MICROPY_HW_USB_IS_MULTI_OTG
+        #if USE_USB_CNTR_SOFM
         USB->CNTR &= ~USB_CNTR_SOFM;
         #else
         hpcd->Instance->GINTMSK &= ~USB_OTG_GINTMSK_SOFM;

ports/stm32/usbd_conf.c

@@ -49,6 +49,10 @@ PCD_HandleTypeDef pcd_hs_handle;
 #define USB_OTG_FS USB
 #endif
 
+#if defined(STM32G0)
+#define USB_OTG_FS USB_DRD_FS
+#endif
+
 /*******************************************************************************
                        PCD BSP Routines
 *******************************************************************************/
@@ -61,6 +65,22 @@ PCD_HandleTypeDef pcd_hs_handle;
 void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd) {
     #if MICROPY_HW_USB_FS
     if (hpcd->Instance == USB_OTG_FS) {
+        // Configure USB GPIO's.
+
+        #if defined(STM32G0)
+
+        // These MCUs don't have an alternate function for USB but rather require
+        // the pins to be disconnected from all peripherals, ie put in analog mode.
+
+        mp_hal_pin_config(pin_A11, MP_HAL_PIN_MODE_ANALOG, MP_HAL_PIN_PULL_NONE, 0);
+        mp_hal_pin_config_speed(pin_A11, GPIO_SPEED_FREQ_VERY_HIGH);
+        mp_hal_pin_config(pin_A12, MP_HAL_PIN_MODE_ANALOG, MP_HAL_PIN_PULL_NONE, 0);
+        mp_hal_pin_config_speed(pin_A12, GPIO_SPEED_FREQ_VERY_HIGH);
+
+        #else
+
+        // Other MCUs have an alternate function for GPIO's to be in USB mode.
+
         #if defined(STM32H7)
         const uint32_t otg_alt = GPIO_AF10_OTG1_FS;
         #elif defined(STM32L0)
@@ -78,6 +98,8 @@ void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd) {
         mp_hal_pin_config(pin_A12, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, otg_alt);
         mp_hal_pin_config_speed(pin_A12, GPIO_SPEED_FREQ_VERY_HIGH);
 
+        #endif
+
         #if defined(MICROPY_HW_USB_VBUS_DETECT_PIN)
         // USB VBUS detect pin is always A9
         mp_hal_pin_config(MICROPY_HW_USB_VBUS_DETECT_PIN, MP_HAL_PIN_MODE_INPUT, MP_HAL_PIN_PULL_NONE, 0);
@@ -88,14 +110,16 @@ void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd) {
         mp_hal_pin_config(MICROPY_HW_USB_OTG_ID_PIN, MP_HAL_PIN_MODE_ALT_OPEN_DRAIN, MP_HAL_PIN_PULL_UP, otg_alt);
         #endif
 
-        #if defined(STM32H7)
+        #if defined(STM32G0)
+        __HAL_RCC_USB_CLK_SLEEP_ENABLE();
+        #elif defined(STM32H7)
         // Keep USB clock running during sleep or else __WFI() will disable the USB
         __HAL_RCC_USB2_OTG_FS_CLK_SLEEP_ENABLE();
         __HAL_RCC_USB2_OTG_FS_ULPI_CLK_SLEEP_DISABLE();
         #endif
 
         // Enable USB FS Clocks
-        #if !MICROPY_HW_USB_IS_MULTI_OTG
+        #if !MICROPY_HW_USB_IS_MULTI_OTG || defined(STM32G0)
         __HAL_RCC_USB_CLK_ENABLE();
         #else
         __USB_OTG_FS_CLK_ENABLE();
@@ -113,7 +137,10 @@ void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd) {
         #endif
 
         // Configure and enable USB FS interrupt
-        #if defined(STM32L0)
+        #if defined(STM32G0)
+        NVIC_SetPriority(USB_UCPD1_2_IRQn, IRQ_PRI_OTG_FS);
+        HAL_NVIC_EnableIRQ(USB_UCPD1_2_IRQn);
+        #elif defined(STM32L0)
         NVIC_SetPriority(USB_IRQn, IRQ_PRI_OTG_FS);
         HAL_NVIC_EnableIRQ(USB_IRQn);
         #elif defined(STM32L432xx)
@@ -235,7 +262,11 @@ void HAL_PCD_MspDeInit(PCD_HandleTypeDef *hpcd) {
     #if MICROPY_HW_USB_FS
     if (hpcd->Instance == USB_OTG_FS) {
         /* Disable USB FS Clocks */
+        #if defined(STM32G0)
+        __HAL_RCC_USB_CLK_DISABLE();
+        #else
         __USB_OTG_FS_CLK_DISABLE();
+        #endif
         return;
     }
     #endif
@@ -413,7 +444,9 @@ USBD_StatusTypeDef USBD_LL_Init(USBD_HandleTypeDef *pdev, int high_speed, const
         pcd_fs_handle.Init.lpm_enable = DISABLE;
         pcd_fs_handle.Init.battery_charging_enable = DISABLE;
         #if MICROPY_HW_USB_IS_MULTI_OTG
+        #if !defined(STM32G0)
         pcd_fs_handle.Init.use_dedicated_ep1 = 0;
+        #endif
         pcd_fs_handle.Init.dma_enable = 0;
         #if !defined(MICROPY_HW_USB_VBUS_DETECT_PIN)
         pcd_fs_handle.Init.vbus_sensing_enable = 0; // No VBUS Sensing on USB0
@@ -430,7 +463,7 @@ USBD_StatusTypeDef USBD_LL_Init(USBD_HandleTypeDef *pdev, int high_speed, const
         HAL_PCD_Init(&pcd_fs_handle);
 
         // Set FIFO buffer sizes
-        #if !MICROPY_HW_USB_IS_MULTI_OTG
+        #if !MICROPY_HW_USB_IS_MULTI_OTG || defined(STM32G0)
         uint32_t fifo_offset = USBD_PMA_RESERVE; // need to reserve some data at start of FIFO
         for (size_t i = 0; i < USBD_PMA_NUM_FIFO; ++i) {
             uint16_t ep_addr = ((i & 1) * 0x80) | (i >> 1);