模拟iic读写AT24C512问题？

freewayflyer · 发表于 2015-12-10 09:05:50

程序是从原子例程的基础上改的之前试过读写AT24C08，读写正常；但同样的电路换成AT24C512就不行，#define AT24C512 65535 这个已经改了，读出来全是FF，应该是没写进去 wp置低了

还有就是驱动AT24C08的时候我把例程SCL SDA的管脚配置成开漏输出读写也不行（加了上拉电阻，而且我测得波形貌似也正常），配成推挽输出就能正常读写

[mw_shl_code=c,true]void AT24CXX_IIC_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOE, ENABLE ); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; //???ì???? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOE, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; //???ì???? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOE, &GPIO_InitStructure); GPIO_SetBits(GPIOE,GPIO_Pin_9|GPIO_Pin_10); //PB10,PB11 ?????? } [/mw_shl_code]

[mw_shl_code=c,true]////////////////////////////////////////////////////////////////////////////////// #define AT24CXX_SDA_IN() {GPIOE->CRH&=0XFFFFF0FF;GPIOE->CRH|=8<<8;} #define AT24CXX_SDA_OUT() {GPIOE->CRH&=0XFFFFF0FF;GPIOE->CRH|=3<<8;} //IO??×÷???? #define AT24CXX_IIC_WP PEout(8) //SCL #define AT24CXX_IIC_SCL PEout(9) //SCL #define AT24CXX_IIC_SDA PEout(10) //SDA #define AT24CXX_READ_SDA PEin(10) //????SDA #define AT24C01 127 #define AT24C02 255 #define AT24C04 511 #define AT24C08 1023 #define AT24C16 2047 #define AT24C32 4095 #define AT24C64 8191 #define AT24C128 16383 #define AT24C256 32767 #define AT24C512 65535 //?¨??EE_TYPE??AT24C512 #define EE_TYPE AT24C512[/mw_shl_code]

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