FM25H20驱动程序

#include "stm32f4xx.h" #include "Mc_stm32f4_fm25h20.h" static void Write_Byte(rt_uint8_t SByte) { rt_uint8_t i,btemp; btemp = SByte; for(i=0; i<8; i++) { SPI2_SCK_L; if(btemp & 0x80) SPI2_MOSI_H; else SPI2_MOSI_L; btemp<<=1; SPI2_SCK_H; } } static rt_uint8_t Read_Byte(void) { rt_uint8_t i,btemp; btemp = 0x00; for(i=0; i<8; i++) { btemp<<=1; SPI2_SCK_L; __nop(); SPI2_SCK_H; btemp |= SPI2_MISO; } return btemp; } /* 功能： - 初始化FM控制接口，IO模拟SPI - */ void FM25_init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(FM_SPI_PORT_CLK | RCC_AHB1Periph_GPIOC, ENABLE); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; GPIO_InitStructure.GPIO_Pin = SPI2_MOSI_PIN; GPIO_Init(FM_SPI_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Pin = FM_CS1_PIN; GPIO_Init(FM_SPI_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; GPIO_InitStructure.GPIO_Pin = SPI2_SCK_PIN; GPIO_Init(FM_SPI_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; GPIO_InitStructure.GPIO_Pin = SPI2_MISO_PIN; GPIO_Init(FM_SPI_PORT, &GPIO_InitStructure); FM_CS1_H; //片选置高 SPI2_SCK_L; //时钟置低 SPI2_MOSI_H; //数据置高 } /* 功能： - 从FM25H20批量读取数据 参数： - address:FM25H20的地址，pdata:读出数据的存储指针，length:读出数据的长度 */ void FM25_read(rt_uint32_t address, rt_uint8_t* pdata, rt_uint32_t length) { rt_uint8_t* padr; unsigned long temp_adr,temp_len,i; temp_adr = address; temp_len = length; if(temp_adr >= FM_SIZE) temp_adr = temp_adr%FM_SIZE; padr=(rt_uint8_t*)&temp_adr; FM_CS1_L; //片选使能 Write_Byte(CMD_READ); //读指令 Write_Byte(padr[2]); //读地址高两位 Write_Byte(padr[1]); //读地址中间字节 Write_Byte(padr[0]); //读地址低字节 /*读出数据*/ for(i=0;i<temp_len;i++) pdata[i]=Read_Byte(); FM_CS1_H; //片选禁止 } /* 功能： - 从FM25H20批量:写入数据 参数： - address:FM25H20的地址，pdata:写入数据的存储指针，length:写入数据的长度 */ void FM25_write(rt_uint32_t address, rt_uint8_t* pdata, rt_uint32_t length) { rt_uint8_t* padr; rt_uint32_t temp_adr,temp_len,i; temp_adr = address; temp_len = length; if(temp_adr >= FM_SIZE) temp_adr = temp_adr%FM_SIZE; padr=(rt_uint8_t*)&temp_adr; FM_CS1_L; //片选使能，写使能 Write_Byte(CMD_WREN); //写使能 FM_CS1_H; FM_CS1_L; Write_Byte(CMD_WRITE); //写指令 Write_Byte(padr[2]); //写地址高两位 Write_Byte(padr[1]); //写地址中间字节 Write_Byte(padr[0]); //写地址低字节 /*写入数据*/ for(i=0;i<temp_len;i++) Write_Byte(pdata[i]); FM_CS1_H; //片选禁止写保护 }