stm32/mboot: Add support for G0 MCUs.

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

ports/stm32/boards/stm32g0b1xe.ld

@@ -3,6 +3,7 @@ MEMORY
 {
     RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 128K
     FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 352K
+    FLASH_APP (rx)  : ORIGIN = 0x08008000, LENGTH = 320K
     FLASH_FS (rx)   : ORIGIN = 0x08058000, LENGTH = 160K  /* starting @ 352K */
 }
 

ports/stm32/i2cslave.h

@@ -43,6 +43,10 @@ static inline void i2c_slave_init(i2c_slave_t *i2c, int irqn, int irq_pri, int a
     RCC->APB1ENR |= 1 << (RCC_APB1ENR_I2C1EN_Pos + i2c_idx);
     volatile uint32_t tmp = RCC->APB1ENR; // Delay after enabling clock
     (void)tmp;
+    #elif defined(STM32G0)
+    RCC->APBENR1 |= 1 << (RCC_APBENR1_I2C1EN_Pos + i2c_idx);
+    volatile uint32_t tmp = RCC->APBENR1; // Delay after enabling clock
+    (void)tmp;
     #elif defined(STM32H7)
     RCC->APB1LENR |= 1 << (RCC_APB1LENR_I2C1EN_Pos + i2c_idx);
     volatile uint32_t tmp = RCC->APB1LENR; // Delay after enabling clock

ports/stm32/mboot/Makefile

@@ -134,7 +134,12 @@ SRC_C += \
 SRC_O += \
 	$(STARTUP_FILE) \
 	$(SYSTEM_FILE) \
-	ports/stm32/resethandler.o \
+
+ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),f0 g0 l0))
+SRC_O += ports/stm32/resethandler_m0.o
+else
+SRC_O += ports/stm32/resethandler.o
+endif
 
 ifeq ($(MBOOT_ENABLE_PACKING), 1)
 

ports/stm32/mboot/main.c

@@ -371,6 +371,9 @@ void SystemClock_Config(void) {
 #if defined(STM32F4) || defined(STM32F7)
 #define AHBxENR AHB1ENR
 #define AHBxENR_GPIOAEN_Pos RCC_AHB1ENR_GPIOAEN_Pos
+#elif defined(STM32G0)
+#define AHBxENR IOPENR
+#define AHBxENR_GPIOAEN_Pos RCC_IOPENR_GPIOAEN_Pos
 #elif defined(STM32H7)
 #define AHBxENR AHB4ENR
 #define AHBxENR_GPIOAEN_Pos RCC_AHB4ENR_GPIOAEN_Pos
@@ -406,7 +409,9 @@ void mp_hal_pin_config_speed(uint32_t port_pin, uint32_t speed) {
 /******************************************************************************/
 // FLASH
 
-#if defined(STM32WB)
+#if defined(STM32G0)
+#define FLASH_END (FLASH_BASE + FLASH_SIZE - 1)
+#elif defined(STM32WB)
 #define FLASH_END FLASH_END_ADDR
 #endif
 
@@ -426,6 +431,8 @@ void mp_hal_pin_config_speed(uint32_t port_pin, uint32_t speed) {
 #define FLASH_LAYOUT_STR "@Internal Flash  /0x08000000/04*016Kg,01*064Kg,07*128Kg" MBOOT_SPIFLASH_LAYOUT MBOOT_SPIFLASH2_LAYOUT
 #elif defined(STM32F765xx) || defined(STM32F767xx) || defined(STM32F769xx)
 #define FLASH_LAYOUT_STR "@Internal Flash  /0x08000000/04*032Kg,01*128Kg,07*256Kg" MBOOT_SPIFLASH_LAYOUT MBOOT_SPIFLASH2_LAYOUT
+#elif defined(STM32G0)
+#define FLASH_LAYOUT_STR "@Internal Flash  /0x08000000/256*02Kg" MBOOT_SPIFLASH_LAYOUT MBOOT_SPIFLASH2_LAYOUT
 #elif defined(STM32H743xx)
 #define FLASH_LAYOUT_STR "@Internal Flash  /0x08000000/16*128Kg" MBOOT_SPIFLASH_LAYOUT MBOOT_SPIFLASH2_LAYOUT
 #elif defined(STM32H750xx)
@@ -1349,7 +1356,9 @@ void stm32_main(uint32_t initial_r0) {
     #endif
     #endif
 
+    #if __CORTEX_M >= 0x03
     NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
+    #endif
 
     #if USE_CACHE && defined(STM32F7)
     SCB_EnableICache();
@@ -1547,7 +1556,13 @@ void I2Cx_EV_IRQHandler(void) {
 
 #if !USE_USB_POLLING
 
-#if defined(STM32WB)
+#if defined(STM32G0)
+
+void USB_UCPD1_2_IRQHandler(void) {
+    HAL_PCD_IRQHandler(&pcd_fs_handle);
+}
+
+#elif defined(STM32WB)
 
 void USB_LP_IRQHandler(void) {
     HAL_PCD_IRQHandler(&pcd_fs_handle);