Peer review cleanups and added CI test.

Author: dgarske

.github/workflows/test-configs.yml

@@ -138,6 +138,12 @@ jobs:
 
   # TODO: SP math with small stack has issues
 
+  stm32c0:
+    uses: ./.github/workflows/test-build.yml
+    with:
+      arch: arm
+      config-file: ./config/examples/stm32c0.config
+
   stm32f4_small_blocks_uart_update_test:
     uses: ./.github/workflows/test-build.yml
     with:

hal/stm32c0.c

@@ -36,11 +36,10 @@
 
 /*** RCC ***/
 #define RCC_BASE (0x40021000)
-#define RCC_CR              (*(volatile uint32_t *)(RCC_BASE + 0x00))  /* RM0444 - 5.4.1 */
-#define RCC_CFGR            (*(volatile uint32_t *)(RCC_BASE + 0x08))  /* RM0444 - 5.4.3 */
-#define APB1_CLOCK_ER       (*(volatile uint32_t *)(RCC_BASE + 0x3C))
-#define APB2_CLOCK_ER       (*(volatile uint32_t *)(RCC_BASE + 0x40))
-
+#define RCC_CR              (*(volatile uint32_t *)(RCC_BASE + 0x00))  /* RM0490 - 5.4.1 */
+#define RCC_CFGR            (*(volatile uint32_t *)(RCC_BASE + 0x08))  /* RM0490 - 5.4.3 */
+#define APB1_CLOCK_ER       (*(volatile uint32_t *)(RCC_BASE + 0x3C))  /* RM0490 - 5.4.13 */
+#define APB2_CLOCK_ER       (*(volatile uint32_t *)(RCC_BASE + 0x40))  /* RM0490 - 5.4.14 */
 
 #define RCC_CR_HSIRDY               (1 << 10)
 #define RCC_CR_HSION                (1 << 8)
@@ -56,20 +55,14 @@
 #define RCC_CR_HSIDIV_64  (6ul << RCC_CR_HSIDIV_SHIFT)
 #define RCC_CR_HSIDIV_128  (7ul << RCC_CR_HSIDIV_SHIFT)
 
-
 #define RCC_CFGR_SW_HSISYS          0x0
-#define RCC_CFGR_SW_PLL             0x2
-#define RCC_PLLCFGR_PLLR_EN       (1 << 28) /* RM0444 - 5.4.3 */
-
-#define RCC_PLLCFGR_PLLSRC_HSI16  2
-
 
 /*** APB PRESCALER ***/
 #define RCC_PRESCALER_DIV_NONE 0
 
 /*** FLASH ***/
 #define PWR_APB1_CLOCK_ER_VAL       (1 << 28)
-#define SYSCFG_APB2_CLOCK_ER_VAL    (1 << 0) /* RM0444 - 5.4.15 - RCC_APBENR2 - SYSCFGEN */
+#define SYSCFG_APB2_CLOCK_ER_VAL    (1 << 0) /* RM0490 - 5.4.14 - RCC_APBENR2 - SYSCFGEN */
 
 #define FLASH_BASE          (0x40022000)  /*FLASH_R_BASE = 0x40000000UL + 0x00020000UL + 0x00002000UL */
 #define FLASH_ACR           (*(volatile uint32_t *)(FLASH_BASE + 0x00)) /* RM0490 - 3.7.1 - FLASH_ACR */
@@ -230,26 +223,18 @@ static void clock_pll_off(void)
     DMB();
 }
 
-/* This implementation will setup HSI RC 48 MHz as System Clock Source, set
- * flash wait state to 1, and set all peripherals to 16MHz (div4)
- */
+/* This implementation will setup HSI RC 48 MHz as System Clock Source and set
+ * flash wait state to 1 */
 static void clock_pll_on(int powersave)
 {
     uint32_t reg32;
-    uint32_t cpu_freq, plln, pllm, pllq, pllp, pllr, hpre, ppre, flash_waitstates;
+    uint32_t cpu_freq, flash_waitstates;
 
     /* Enable Power controller */
     APB1_CLOCK_ER |= PWR_APB1_CLOCK_ER_VAL;
 
     /* Select clock parameters (CPU Speed = 48MHz) */
     cpu_freq = 48000000;
-    pllm = 4;
-    plln = 80;
-    pllp = 10;
-    pllq = 5;
-    pllr = 5;
-    hpre  = RCC_PRESCALER_DIV_NONE;
-    ppre = RCC_PRESCALER_DIV_NONE;
     flash_waitstates = 1;
 
     flash_set_waitstates(flash_waitstates);

hal/stm32c0.ld

@@ -1,7 +1,7 @@
 MEMORY
 {
     FLASH (rx) : ORIGIN = 0x08000000, LENGTH = @BOOTLOADER_PARTITION_SIZE@
-    RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 12K-1
+    RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 12K
 }
 
 SECTIONS