📄 sdhal.c
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/****************************************Copyright (c)**************************************************
** Co.,LTD.
**
** http://
**
**--------------File Info-------------------------------------------------------------------------------
** File name: sdhal.c
** Last modified Date: 2007-10-15
** Last Version: V2.0
** Descriptions: SD/MMC卡读写模块: 硬件抽象层 ---- SPI操作函数
** Soft Packet of SD/MMC Card: hard abstrast layer ---- function of SPI operation
**
**------------------------------------------------------------------------------------------------------
** Created by: lhlzjut@hotmail.com
** Created date: 2007-10-15
** Version: V1.0
** Descriptions: The original version
**
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
#include "config.h"
#include "sdhal.h"
/* Select MSD Card: ChipSelect pin low */
#define MSD_CS_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_4)
/* Deselect MSD Card: ChipSelect pin high */
#define MSD_CS_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_4)
// global variables
INT8U SendData;
INT8U SendOver;
INT8U ReceiveData;
INT8U ReceiveOver;
/* Private function prototypes -----------------------------------------------*/
static void SPI_Config(void);
/**************************************************************
读写SD卡的SPI接口函数: SPI接口设置,发送/接收字节函数
**************************************************************/
/*******************************************************************************************************************
** 函数名称: void SD_HardWareInit() Name: void SD_HardWareInit()
** 功能描述: 初始化访问SD卡的硬件条件 Function: initialize the hardware condiction that access sd card
** 输 入: 无 Input: NULL
** 输 出: 无 Output: NULL
********************************************************************************************************************/
void SD_HardWareInit(void)
{
SPI_Config(); /* 配置,初始化,SPI接口和SD片选 */
MSD_CS_HIGH();
// SPI_Clk400k(); /* 配置BSPI波特率为400k */
}
/*******************************************************************************************************************
** 函数名称: void SPI_Clk400k() Name: void SPI_Clk400k()
** 功能描述: 设置SPI的时钟小于400kHZ Function: set the clock of SPI less than 400kHZ
** 输 入: 无 Input: NULL
** 输 出: 无 Output: NULL
********************************************************************************************************************/
void SPI_Clk400k(void)
{
SPI_InitTypeDef SPI_InitStructure;
/* SPI1 Config */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* SPI1 enable */
SPI_Cmd(SPI1, ENABLE);
}
/*******************************************************************************************************************
** 函数名称: void SPI_ClkToMax() Name: void SPI_ClkToMax()
** 功能描述: 设置SPI的clock到最大值 Function: set the clock of SPI to maximum
** 输 入: 无 Input: NULL
** 输 出: 无 Output: NULL
********************************************************************************************************************/
void SPI_ClkToMax(void)
{
SPI_InitTypeDef SPI_InitStructure;
/* SPI1 Config */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* SPI1 enable */
SPI_Cmd(SPI1, ENABLE);
}
/*******************************************************************************************************************
** 函数名称: void SPI_SendByte() Name: void SPI_SendByte()
** 功能描述: 通过SPI接口发送一个字节 Function: send a byte by SPI interface
** 输 入: INT8U byte: 发送的字节 Input: INT8U byte: the byte that will be send
** 输 出: 无 Output: NULL
********************************************************************************************************************/
void SPI_SendByte(INT8U byte)
{//为了和播放器更好的合作，使用中断来接收和发送是最好的选择
// Wait until the transmit buffer is empty
while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
// Send the byte
SPI_SendData(SPI1, byte);
/*
SendData = byte;
SendOver = 0;
while(!SendOver);
*/
}
/*******************************************************************************************************************
** 函数名称: INT8U SPI_RecByte() Name: INT8U SPI_RecByte()
** 功能描述: 从SPI接口接收一个字节 Function: receive a byte from SPI interface
** 输 入: 无 Input: NULL
** 输 出: 收到的字节 Output: the byte that be received
********************************************************************************************************************/
INT8U SPI_RecByte(void)
{//为了和播放器更好的合作，使用中断来接收和发送是最好的选择
INT8U Data = 0;
// Wait until the transmit buffer is empty
while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
// Send the byte
SPI_SendData(SPI1, 0xFF);
// Wait until a data is received
while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);
// Get the received data
Data = SPI_ReceiveData(SPI1);
// Return the shifted data
return Data;
/*
SPI_SendByte(0xFF);
ReceiveData = 0;
ReceiveOver = 0;
while(!ReceiveOver);
return ReceiveData;
*/
}
/*******************************************************************************************************************
** 函数名称: void SPI_CS_Assert() Name: void SPI_CS_Assert()
** 功能描述: 片选SPI从机 Function: select the SPI slave
** 输 入: 无 Input: NULL
** 输 出: 无 Output: NULL
********************************************************************************************************************/
void SPI_CS_Assert(void)
{
MSD_CS_LOW(); /* 片选SPI从机 select the SPI slave */
}
/*******************************************************************************************************************
** 函数名称: void SPI_CS_Deassert() Name: void SPI_CS_Deassert()
** 功能描述: 不片选SPI从机 Function: not select the SPI slave
** 输 入: 无 Input: NULL
** 输 出: 无 Output: NULL
********************************************************************************************************************/
void SPI_CS_Deassert(void)
{
MSD_CS_HIGH(); /* 不片选SPI从机 not select the SPI slave */
}
/*******************************************************************************************************************
** 函数名称: void SD_ChkCard() Name: void SD_ChkCard()
** 功能描述: 检测卡是否完全插入 Function: check weather card is insert entirely
** 输 入: 无 Input: NULL
** 输 出: 1: 卡完全插入 0: 卡没有完全插入 Output: 1: insert entirely 0: not insert entirely
********************************************************************************************************************/
INT8U SD_ChkCard(void)
{
if (SD_INSERT_STATUS() != 0)
return 0; /* 未完全插入 not insert entirely */
else
return 1; /* 完全插入 insert entirely */
}
/*******************************************************************************************************************
** 函数名称: void SD_ChkCardWP() Name: void SD_ChkCardWP()
** 功能描述: 检测卡写保护 Function: check weather card is write protect
** 输 入: 无 Input: NULL
** 输 出: 1: 卡已写保护 0: 卡未写保护 Output: 1: insert write protect 0: not write protect
********************************************************************************************************************/
INT8U SD_ChkCardWP(void)
{
if (SD_WP_STATUS() != 0)
return 1; /* 卡写保护 */
else
return 0; /* 卡未写保护 */
}
/*******************************************************************************
* Function Name : SPI_Config
* Description : Initializes the SPI1 and CS pins.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SPI_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* GPIOA and GPIOC Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC |RCC_APB2Periph_GPIOE, ENABLE);
/* SPI1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/* Configure SPI1 pins: SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure PC12 pin: CS pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* SPI1 Config */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* SPI1 enable */
SPI_Cmd(SPI1, ENABLE);
/* Enable SPI1 TXE interrupt */
//SPI_ITConfig(SPI1, SPI_IT_TXE, ENABLE);
/* Enable SPI1 RXNE interrupt */
//SPI_ITConfig(SPI1, SPI_IT_RXNE, ENABLE);
/* Configure and enable SPI1 interrupt -------------------------------------*/
NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
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