38 lines
686 B
C
38 lines
686 B
C
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/*
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* stm32f4xx_stack.c
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*
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* Created on: Oct 1, 2015
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* Author: tkl
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "stm32f4xx_stack.h"
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#include "queue.h"
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#include "thread.h"
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stack_t *stack_init(
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void (*task_func)(void *),
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void *arg,
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stack_t *stack_start,
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unsigned int stack_size)
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{
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stack_t *stk;
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stk = (stack_t *)(stack_start + stack_size);
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stk--;
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*stk = 0x01000000; // xPSR
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stk--;
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*stk = (stack_t) task_func; // PC
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stk--;
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*stk = (stack_t) thread_exit; // LR
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stk -= 5; // R12, R3, R2 and R1.
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*stk = (stack_t) arg; // R0
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stk--;
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*stk = 0xfffffffd;
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stk -= 8; // R11, R10, R9, R8, R7, R6, R5 and R4.
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return stk;
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}
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