[stm32] Adapt and enable flash driver for STM32G4

README.md

@@ -355,7 +355,7 @@ Please [discover modm's peripheral drivers for your specific device][discover].
 <td align="center">✅</td>
 <td align="center">○</td>
 <td align="center">✅</td>
-<td align="center">○</td>
+<td align="center">✅</td>
 <td align="center">○</td>
 <td align="center">○</td>
 <td align="center">○</td>

src/modm/platform/flash/stm32/flash.cpp.in

@@ -91,7 +91,7 @@ Flash::erase(uint8_t index)
 	FLASH->CR = FLASH_CR_STRT | FLASH_CR_SER | uint32_t(size) |
 			((index << FLASH_CR_SNB_Pos) & FLASH_CR_SNB_Msk);
 %% else
-%% if family == "g0"
+%% if family in ["g0","g4"]
 	FLASH->CR = FLASH_CR_STRT | FLASH_CR_PER |
 			((index << FLASH_CR_PNB_Pos) & FLASH_CR_PNB_Msk);
 %% else
@@ -154,6 +154,7 @@ Flash::program(uintptr_t addr, MaxWordType data)
 	FLASH->CR &= ~FLASH_CR_PG;
 	return FLASH->SR & FLASH_SR_PGERR;
 %% else
+	FLASH->SR |= FLASH_SR_EOP;
 	FLASH->CR = 0;
 	return FLASH->SR & FLASH_SR_ERR;
 %% endif

src/modm/platform/flash/stm32/flash.hpp.in

@@ -55,7 +55,6 @@ public:
 %% if not has_sectors and family == "g0"
 		Rcc::disable<Peripheral::Flash>();
 %% endif
-
 	}
 
 	static bool

src/modm/platform/flash/stm32/module.lb

@@ -17,7 +17,7 @@ def init(module):
 
 def prepare(module, options):
     device = options[":target"]
-    if device.identifier.family not in ["g0", "f1", "f4"]:
+    if device.identifier.family not in ["g0","g4", "f1", "f4"]:
         return False
     if not device.has_driver("flash:stm32*"):
         return False
@@ -44,6 +44,10 @@ def build(env):
         block_shift = 11
         ftype = "page"
         busy_bit = "FLASH_SR_BSY1"
+    elif target.family in ["g4"]:
+        block_shift = 11
+        ftype = "page"
+        busy_bit = "FLASH_SR_BSY"
 
     env.substitutions = {
         "start": int(flash["start"], 16),