stm32: Add initial support for STM32WL MCUs.

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

1 files changed, 37 insertions, 0 deletions

diff --git a/ports/stm32/powerctrlboot.c b/ports/stm32/powerctrlboot.c
index 41b56296e..4ecd83e2c 100644
--- a/ports/stm32/powerctrlboot.c
+++ b/ports/stm32/powerctrlboot.c
@@ -212,4 +212,41 @@ void SystemClock_Config(void) {
     powerctrl_config_systick();
 }
 
+#elif defined(STM32WL)
+
+#include "stm32wlxx_ll_utils.h"
+
+void SystemClock_Config(void) {
+    // Set flash latency
+    LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);
+    while (LL_FLASH_GetLatency() != LL_FLASH_LATENCY_2) {
+    }
+
+    LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
+
+    // Enable MSI
+    LL_RCC_MSI_Enable();
+    while (!LL_RCC_MSI_IsReady()) {
+    }
+
+    // Configure MSI
+    LL_RCC_MSI_EnableRangeSelection();
+    LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_11);
+    LL_RCC_MSI_SetCalibTrimming(0);
+
+    // Select SYSCLK source
+    LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_MSI);
+    while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_MSI) {
+    }
+
+    // Set bus dividers
+    LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
+    LL_RCC_SetAHB3Prescaler(LL_RCC_SYSCLK_DIV_1);
+    LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
+    LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
+
+    SystemCoreClockUpdate();
+    powerctrl_config_systick();
+}
+
 #endif