CORTEX_M4 — 位带操作

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#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"
#define RAM_BASE                         0x20000000
#define RAM_BITBAND_BASE                 0x22000000
#define VARIABLES_RESET_BIT(variables_addr, bit_number)    \

int main(void)
{
  system_clock_config();
  at32_board_init();
  variables = 0xA5A5A5A5;

  /* get the variables address */
  variables_addr = (uint32_t)&variables;

  /* modify variables bit0 and check result */
  VARIABLES_RESET_BIT(variables_addr, 0);
  if((variables != 0xA5A5A5A4) || (VARIABLES_GET_BIT(variables_addr, 0) != 0))
  {
    result_error();
  }

  /* modify variables bit0 and check result */
  VARIABLES_SET_BIT(variables_addr, 0);
  if((variables != 0xA5A5A5A5) || (VARIABLES_GET_BIT(variables_addr, 0) != 1))
  {
    result_error();
  }

  /* modify variables bit16 and check result */
  VARIABLES_RESET_BIT(variables_addr, 16);
  if((variables != 0xA5A4A5A5) || (VARIABLES_GET_BIT(variables_addr, 16) != 0))
  {
    result_error();
  }

  /* modify variables bit16 and check result */
  VARIABLES_SET_BIT(variables_addr, 16);
  if((variables != 0xA5A5A5A5) || (VARIABLES_GET_BIT(variables_addr, 16) != 1))
  {
    result_error();
  }

  /* modify variables bit31 and check result */
  VARIABLES_RESET_BIT(variables_addr, 31);
  if((variables != 0x25A5A5A5) || (VARIABLES_GET_BIT(variables_addr, 31) != 0))
  {
    result_error();
  }

  /* modify variables bit31 and check result */
  VARIABLES_SET_BIT(variables_addr, 31);
  if((variables != 0xA5A5A5A5) || (VARIABLES_GET_BIT(variables_addr, 31) != 1))
  {
    result_error();
  }

  while(1)
  {
    /* led2 toggle */
    PERIPHERAL_RESET_BIT((uint32_t)&LED2_GPIO->odt, 13);
    delay_ms(500);
    PERIPHERAL_SET_BIT((uint32_t)&LED2_GPIO->odt, 13);
    delay_ms(500);
  }
}