上传下这两天写的驱动程序----ARM Cortex-M3 驱动 并行IO口 RTC

   这是我第一次看元器件的数据手册，按数据手册上的时序图，一步步写出来的驱动程序，搞了我2天时间了。我用的主芯片是LM3S9B92，时钟模块是BQ3287，(这驱动也可以驱动DS12C887 RTC模块)！

 

#include<inc/lm3s9b92.h>
#include"HC204Llcd.h"
#include"Sys_init.h"
#include"define_init.h"
#include"BQ3287.h"

static void Delay_1um(void)
{
    asm("nop");
}

static void BQ3287_Delay(unint delayTime)
{
    unsigned int i=0;
    for(i = 0; i < delayTime; i++)
    {
        Delay_1um();
    }
   
}
static void BQ3287_checkbusy(void)
{
  unchar temp;
  GPIOPinWrite(GPIO_PORTB_BASE, CS, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, WD, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0xFF);
  Delay_1um();
 
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);       //使能J口

  GPIOPinTypeGPIOOutput(GPIO_PORTJ_BASE,0xFF);   //定义J口为输出

  GPIOPinWrite(GPIO_PORTJ_BASE,0xFF,ds_reg_a);
  BQ3287_Delay(10);

  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0x00);
  Delay_1um();
  do
  {
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);           //
    GPIOPinTypeGPIOInput(GPIO_PORTJ_BASE,ds_reg_a);  //
    temp=GPIOPinRead(GPIO_PORTJ_BASE,0xFF);
    GPIOPinTypeGPIOOutput(GPIO_PORTJ_BASE,0xFF);       //
    BQ3287_Delay(10);
  }
  while(0x80 == (temp & 0x80));
 
  Delay_1um();
 
  GPIOPinWrite(GPIO_PORTB_BASE, CS, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0xFF);
  Delay_1um();

}

void BQ3287_writecmd(unchar ds_data,unchar data)
{
  BQ3287_checkbusy();
  Delay_1um();
 
  GPIOPinWrite(GPIO_PORTB_BASE, CS, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, WD, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0xFF);
  Delay_1um();
 
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);        //
  GPIOPinTypeGPIOOutput(GPIO_PORTJ_BASE,0xFF);    //
  GPIOPinWrite(GPIO_PORTJ_BASE,0xFF,ds_data);
  Delay_1um();
   
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, WD, 0x00);

  GPIOPinWrite(GPIO_PORTJ_BASE,0xFF,data);
  BQ3287_Delay(10); 

  GPIOPinWrite(GPIO_PORTB_BASE, CS, 0xFF); 
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, WD, 0xFF);
  Delay_1um();
}

unchar BQ3287_gettime(unchar ds_data)
{
  unchar temp;
 
  GPIOPinWrite(GPIO_PORTB_BASE, CS, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, WD, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0xFF);
  Delay_1um();
 
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);      //
  GPIOPinTypeGPIOOutput(GPIO_PORTJ_BASE,0xFF);   //
  GPIOPinWrite(GPIO_PORTJ_BASE,0xFF,ds_data);
  BQ3287_Delay(10);

  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0x00);
  Delay_1um();
 
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);    //

  GPIOPinTypeGPIOInput(GPIO_PORTJ_BASE,0xFF);   //
  temp=GPIOPinRead(GPIO_PORTJ_BASE,0xFF);
  BQ3287_Delay(10);
 
  GPIOPinWrite(GPIO_PORTB_BASE, CS, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0xFF);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0xFF);
  Delay_1um();
 
  return temp; 
}

void Init_BQ3287(void)
{
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
  GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, WD|RD|AS);
  GPIOPinWrite(GPIO_PORTD_BASE, WD, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, RD, 0x00);
  GPIOPinWrite(GPIO_PORTD_BASE, AS, 0x00);
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
  GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE, CS);//CS

 

  BQ3287_writecmd(0x0a,0x20);             //打开振荡器  
  BQ3287_writecmd(ds_reg_b,0xa2);         
  BQ3287_writecmd(ds_sec_warn,0x00);  
  BQ3287_writecmd(ds_min_warn,0xee);  
  BQ3287_writecmd(ds_hour_warn,0xee); 
  BQ3287_writecmd(ds_reg_c,0x00);     //清状态寄存器
  
  BQ3287_writecmd(ds_reg_b,0x22);     //禁止方波输出，24小时制，BCD码
  BQ3287_Delay(5);
  BQ3287_writecmd(ds_reg_b,0x22); 
  BQ3287_Delay(5);
}