gpio模拟读写rc531问题

只看该作者 · 2010-9-11 23:11

我想通过写读 FifoData来验证rc531 操作是否成功
cpu用的是stm32 ，A0 A1 A2 是高高低并口模式
那写寄存器时应该是 [写reg -> 写数据] 读寄存器是 [写reg -> 读数据]  是这样吗？

mcu接口的屏一般写寄存器 AlE 信号是低写Data ALE 信号是高
看上面的时序图，好像正好是反的，我按照lcd屏的时序去读写也不行

哪位有现成的代码可以参考下吗

下面是我的代码

#define RF_CS    GPIO_Pin_9       //GPIOD
#define RF_RESET GPIO_Pin_6       //GPIOD
#define RF_ALE    GPIO_Pin_10       //GPIOD
#define RF_WR    GPIO_Pin_7       //GPIOD
#define RF_RD    GPIO_Pin_8       //GPIOD

#define RF_CS_HIGH             GPIO_SetBits(GPIOD,RF_CS)
#define RF_CS_LOW             GPIO_ResetBits(GPIOD,RF_CS)

#define RF_RESET_HIGH          GPIO_SetBits(GPIOD,RF_RESET)
#define RF_RESET_LOW          GPIO_ResetBits(GPIOD,RF_RESET)

#define RF_ALE_HIGH          GPIO_SetBits(GPIOD,RF_ALE)
#define RF_ALE_LOW             GPIO_ResetBits(GPIOD,RF_ALE)

#define RF_WR_HIGH             GPIO_SetBits(GPIOD,RF_WR)
#define RF_WR_LOW             GPIO_ResetBits(GPIOD,RF_WR)

#define RF_RD_HIGH             GPIO_SetBits(GPIOD,RF_RD)
#define RF_RD_LOW             GPIO_ResetBits(GPIOD,RF_RD)

void rf_gpio_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD,ENABLE);

/* 并口  */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);

RF_CS_HIGH;
RF_RD_HIGH;
RF_ALE_LOW;
}

void rf_write_cmd(u8 cmd)
{
RF_RD_HIGH;
RF_WR_HIGH;
RF_CS_HIGH;

GPIOC->CRL = 0x22222222;
GPIOC->ODR = (u16)cmd;

RF_ALE_HIGH;
Delay(0x1f);
RF_ALE_LOW;

RF_RD_HIGH;
RF_WR_HIGH;
RF_CS_HIGH;
}

void rf_write_data(u8 data)
{
RF_ALE_LOW;
RF_WR_LOW;
RF_RD_HIGH;
RF_CS_LOW;

//GPIOC->CRL = 0x22222222;       //2M 推挽输出
GPIOC->CRL = 0x33333333;       //50M 推挽输出
GPIOC->ODR = (u16)data;

Delay(0x1f);
RF_WR_HIGH;
RF_CS_HIGH;
RF_ALE_LOW;
RF_RD_HIGH;
}

u8 rf_read_data()
{
u8 data;
RF_ALE_LOW;
RF_WR_HIGH;
RF_RD_LOW;
RF_CS_LOW;

//GPIOE->CRL = 0xcccccccc; //输入
GPIOE->CRL = 0x44444444; //输入
data = (u8)(GPIOE->IDR);

RF_RD_HIGH;
RF_WR_HIGH;
RF_CS_HIGH;
RF_ALE_LOW;

return data;
}

void rf_init(void)
{
u8 data;
rf_gpio_init();

RF_RESET_HIGH;
Delay(0xaffff);
RF_RESET_LOW;
//RF_RESET_HIGH;

rf_write_cmd(0x01);    //command
data = rf_read_data();

rf_write_cmd(0x02);    //fifiData
rf_write_data(0xff);
rf_write_cmd(0x02);
data = rf_read_data();

rf_write_cmd(0x02);    //fifiData
rf_write_data(0xfe);
rf_write_cmd(0x02);
data = rf_read_data();

}