therm Changeset - c14060ecae42 · protofusion repositories

Changeset - c14060ecae42

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cortex-f0

0 2 0

Ethan Zonca - 10 years ago 2015-01-24 16:19:18
ez@ethanzonca.com

Added initial prototype of jump-to-bootloader

2 files changed with 38 insertions and 2 deletions:

main.c

startup_stm32f042x6.s

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main.c

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@@ @@ -62,13 +62,16 @@ int16_t setpoint_steam = 0; @@
 SPI_HandleTypeDef hspi1;
 static __IO uint32_t TimingDelay;
 void deinit(void)
+{
     HAL_DeInit();
+}
 volatile int i=0;
 int main(void)
+{
     /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
@@ @@ -516,14 +519,23 @@ void machine() @@
                         state = STATE_PREHEAT_BREW;
                         break;
                     case 1:
                         state = STATE_SETP;
                         break;
                     case 0:
+                    {
                         ssd1306_clearscreen();
                         ssd1306_DrawString("Entering Bootloader", 1, 0);
                         ssd1306_DrawString("(hopefully)", 2, 0);
                         HAL_Delay(1000);
                         *((unsigned long *)0x200017F0) = 0xDEADBEEF; // 6KB STM32F042
                         NVIC_SystemReset();
                         state = STATE_IDLE;
                         break;
                     } break;
                     default:
                         state = STATE_PREHEAT_BREW;
+                }
+            }
             else if(SW_UP_PRESSED && goto_mode < 2) {
                 goto_mode++;

startup_stm32f042x6.s

➞

Show inline comments

@@ @@ -61,19 +61,43 @@ defined in linker script */ @@
 .word _ebss
   .section .text.Reset_Handler
   .weak Reset_Handler
   .type Reset_Handler, %function
 Reset_Handler:
   /* Bootloader jumping */
   ldr r0, =0x200017F0 /* address of magic token, is addr within memory range? */
   ldr r1, =0xDEADBEEF /* magical beef token */
   ldr r2, [r0, #0] /* load data from magic address */
   str r0, [r0, #0] /* zero data at magic address so we don't bootloop */
   cmp r2, r1 /* compare data at magic address to magic token */
   beq Reboot_Loader /* jump to bootloader if token match */
   /* End bootloader jumping */
   ldr   r0, =_estack
   mov   sp, r0          /* set stack pointer */
 /* Copy the data segment initializers from flash to SRAM */
   movs r1, #0
   b LoopCopyDataInit
 /* Boot into bootloader */
 Reboot_Loader:
   ldr r0, =0x1FFFF6A6 /* Address of bootloader on f042 from CD00167594 pg 15 table 3 */
   /* This replaces ldr sp, [r0, #0] which doesn't work on m0 */
   // Set stack pointer
   ldr r1, [r0, #0]
   mov sp, r1
   // Branch to bootloader
   ldr r0, [r0, #4]
   bx r0
 CopyDataInit:
   ldr r3, =_sidata
   ldr r3, [r3, r1]
   str r3, [r0, r1]
   adds r1, r1, #4

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