stm32: Use IC9 clock source for slow peripherals.

SPI5 doesn't work with clock source IC14. Instead of using
another IC clock, switch to IC9 which is known to work with
all peripherals.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>

Author: iabdalkader

ports/stm32/powerctrlboot.c

@@ -485,10 +485,10 @@ void SystemClock_Config(void) {
     LL_RCC_IC11_SetDivider(1);
     LL_RCC_IC11_Enable();
 
-    // Configure IC14 at 100MHz for slower peripherals.
-    LL_RCC_IC14_SetSource(LL_RCC_ICCLKSOURCE_PLL1);
-    LL_RCC_IC14_SetDivider(8);
-    LL_RCC_IC14_Enable();
+    // Configure IC9 at 100MHz for slower peripherals.
+    LL_RCC_IC9_SetSource(LL_RCC_ICCLKSOURCE_PLL1);
+    LL_RCC_IC9_SetDivider(8);
+    LL_RCC_IC9_Enable();
 
     // Enable buses.
     LL_BUS_EnableClock(LL_APB5 | LL_APB4 | LL_APB3 | LL_APB2 | LL_APB1 | LL_AHB5 | LL_AHB4 | LL_AHB3 | LL_AHB2 | LL_AHB1);

ports/stm32/spi.c

@@ -184,9 +184,9 @@ void spi_init0(void) {
     LL_RCC_SetSPIClockSource(LL_RCC_SPI3_CLKSOURCE_PCLK1);
     LL_RCC_SetSPIClockSource(LL_RCC_SPI6_CLKSOURCE_PCLK4);
 
-    // SPI4/5 clock configuration, IC14 (max 100MHz).
-    LL_RCC_SetSPIClockSource(LL_RCC_SPI4_CLKSOURCE_IC14);
-    LL_RCC_SetSPIClockSource(LL_RCC_SPI5_CLKSOURCE_IC14);
+    // SPI4/5 clock configuration, IC9 (max 100MHz).
+    LL_RCC_SetSPIClockSource(LL_RCC_SPI4_CLKSOURCE_IC9);
+    LL_RCC_SetSPIClockSource(LL_RCC_SPI5_CLKSOURCE_IC9);
     #endif
 }
 

ports/stm32/uart.c

@@ -158,17 +158,17 @@ void uart_init0(void) {
         MICROPY_BOARD_FATAL_ERROR("HAL_RCCEx_PeriphCLKConfig");
     }
     #elif defined(STM32N6)
-    // UART clock configuration, IC14 (max 100MHz).
-    LL_RCC_SetUSARTClockSource(LL_RCC_USART1_CLKSOURCE_IC14);
-    LL_RCC_SetUSARTClockSource(LL_RCC_USART2_CLKSOURCE_IC14);
-    LL_RCC_SetUSARTClockSource(LL_RCC_USART3_CLKSOURCE_IC14);
-    LL_RCC_SetUARTClockSource(LL_RCC_UART4_CLKSOURCE_IC14);
-    LL_RCC_SetUARTClockSource(LL_RCC_UART5_CLKSOURCE_IC14);
-    LL_RCC_SetUSARTClockSource(LL_RCC_USART6_CLKSOURCE_IC14);
-    LL_RCC_SetUARTClockSource(LL_RCC_UART7_CLKSOURCE_IC14);
-    LL_RCC_SetUARTClockSource(LL_RCC_UART8_CLKSOURCE_IC14);
-    LL_RCC_SetUARTClockSource(LL_RCC_UART9_CLKSOURCE_IC14);
-    LL_RCC_SetUSARTClockSource(LL_RCC_USART10_CLKSOURCE_IC14);
+    // UART clock configuration, IC9 (max 100MHz).
+    LL_RCC_SetUSARTClockSource(LL_RCC_USART1_CLKSOURCE_IC9);
+    LL_RCC_SetUSARTClockSource(LL_RCC_USART2_CLKSOURCE_IC9);
+    LL_RCC_SetUSARTClockSource(LL_RCC_USART3_CLKSOURCE_IC9);
+    LL_RCC_SetUARTClockSource(LL_RCC_UART4_CLKSOURCE_IC9);
+    LL_RCC_SetUARTClockSource(LL_RCC_UART5_CLKSOURCE_IC9);
+    LL_RCC_SetUSARTClockSource(LL_RCC_USART6_CLKSOURCE_IC9);
+    LL_RCC_SetUARTClockSource(LL_RCC_UART7_CLKSOURCE_IC9);
+    LL_RCC_SetUARTClockSource(LL_RCC_UART8_CLKSOURCE_IC9);
+    LL_RCC_SetUARTClockSource(LL_RCC_UART9_CLKSOURCE_IC9);
+    LL_RCC_SetUSARTClockSource(LL_RCC_USART10_CLKSOURCE_IC9);
     #endif
 }