simple timer input push/pull, output open-drain

[cortex-from-scratch] / sysinfo.c

diff --git a/sysinfo.c b/sysinfo.c
index fb19c9b..2792f14 100644 (file)
--- a/sysinfo.c
+++ b/sysinfo.c
@@ -1,39 +1,76 @@
+/* (CC-BY-NC-SA) ROBIN KRENS - ROBIN @ ROBINKRENS.NL
+ * 
+ * $LOG$
+ * 2019/7/20 - ROBIN KRENS     
+ * Initial version
+ * Display some system information, calculate
+ * the amount of SRAM available 
+ * 
+ * */
+
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <stm32.h>
-#include <mmap.h>
+
+#include <sys/robsys.h>
+#include <sys/mmap.h>
+
+#include <lib/tinyprintf.h>
+#include <lib/regfunc.h>
 
 
+uint32_t get_msp(void);
+
 void sysinfo() {
 
        uint32_t tmp = *MCU_ID;
+       printf("# DEVICE ID: ");
 
-       uart_puts("CHECKING SYS INFO\n");
-       uart_puts("# DEVICE ID: ");
-
-       if (tmp & 0x414) {
-               uart_puts("HIGH DENSITY\n");
-       }
+       if (tmp & 0x414) 
+               printf("HIGH DENSITY\n");
        else {
-               uart_puts("UNKNOWN\n");
+               printf("UNKNOWN\n");
        }
 
        tmp = (tmp >> 16);
-       uart_puts("# REVISION: ");
+       printf("# REVISION: ");
        switch  (tmp) {
                case 0x1000:
-                     uart_puts("REVISION A\n");
+                     printf("REVISION A\n");
                      break;
                case 0x1001:
-                     uart_puts("REVISION Z\n");
+                     printf("REVISION Z\n");
                      break;
                case 0x1003:
-                     uart_puts("REVISION 1/2/3/X/Y\n");
+                     printf("REVISION 1/2/3/X/Y\n");
                      break;
                default:
-                     uart_puts("UNKNOWN\n");
+                     printf("UNKNOWN\n");
        }
 
+       extern char _endofbss;
+       
+       uint32_t current_stack = get_msp();
+       uint32_t stack_usage = (SRAM_OFFSET + SRAM_SIZE) - current_stack;
+       uint32_t data_bss = (uint32_t) &_endofbss - SRAM_OFFSET;
+       uint32_t mem_free = SRAM_SIZE - stack_usage - data_bss;
+
+       printf("# TOTAL MEMORY: %#x\n", SRAM_SIZE);
+       printf("# FREE MEMORY: %#x\n", mem_free);
+       printf("# STACK USAGE: %#x\n", stack_usage);
+
 }
 
+/* Get the master stack pointer's position
+ * Here we use a so-called naked function, 
+ * that doesn't automatically push and pop  */
+
+uint32_t get_msp(void) __attribute__( ( naked ) );
+uint32_t get_msp(void)
+{
+  uint32_t msp = 0;
+  __asm__ volatile ("mrs %0, msp\n\t" 
+                  "mov r0, %0 \n\t"
+                  "bx lr     \n\t"  : "=r" (msp) );
+  return(msp);
+}