标题: 16MB的FLASHW25Q128驱动 [打印本页]
作者: xiaos    时间: 2015-4-10 17:00
标题: 16MB的FLASHW25Q128驱动
  1. #define SPI_SCK_LOW() GPIOB->ODR&=~(1<<3)
  2. #define SPI_SCK_HIGH()         GPIOB->ODR|=1<<3

  4. #define SPI_MOSI_LOW()GPIOB->ODR&=~(1<<5)
  5. #define SPI_MOSI_HIGH()GPIOB->ODR|=1<<5

  7. #define SPI_CS_LOW()GPIOB->ODR&=~(1<<14)
  8. #define SPI_CS_HIGH()        GPIOB->ODR|=1<<14

  10. #define SPI_MISO_Read()(GPIOB->IDR&(1<<4))


  13. #define W25X_WriteEnable          0x06     //写允许命令
  14. #define W25X_WriteDisable          0x04    //禁止命令
  15. #define W25X_ReadStatusReg      0x05   //读状态寄存器
  16. #define W25X_WriteStatusReg      0x01  //写状态寄存器
  17. #define W25X_ReadData                0x03  //读数据
  18. #define W25X_FastReadData         0x0B //快读
  19. #define W25X_FastReadDual         0x3B  
  20. #define W25X_PageProgram          0x02  //页写
  21. #define W25X_BlockErase               0xD8  //快擦除
  22. #define W25X_SectorErase         0x20  //扇区擦除
  23. #define W25X_ChipErase                            0xC7  //整盘擦除
  24. #define W25X_PowerDown                         0xB9  //低功耗
  25. #define W25X_ReleasePowerDown           0xAB
  26. #define W25X_DeviceID                             0xAB
  27. #define W25X_ManufactDeviceID             0x90
  28. #define W25X_JedecDeviceID                 0x9F


  31. static void SPI_SendByte(uint8_t Byte)         //使用SPI总线发送1个字节的数据
  32. {
  33. //uint8_t Cnt;
  34. //SPI_SCK_LOW();
  35. //for(Cnt=0;Cnt<8;Cnt++)
  36. //{
  37. //if(Byte&0x80)
  38. //SPI_MOSI_HIGH();
  39. //else
  40. //SPI_MOSI_LOW();
  41. //SPI_SCK_HIGH();
  42. //Byte<<=1;
  43. //SPI_SCK_LOW();
  44. //}
  45. while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);
  46. SPI_I2S_SendData(SPI1,Byte);
  47. while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==RESET);
  48. SPI_I2S_ReceiveData(SPI1);
  49. }

  51. static uint8_t SPI_ReceiveByte(void)   //使用SPI总线接收1个字节的数据
  52. {
  53. //uint8_t Byte=0,Cnt;
  54. ////GPIOB->ODR|=1<<4;
  55. //for(Cnt=0;Cnt<8;Cnt++)
  56. //{
  57. //SPI_SCK_HIGH();
  58. //Byte<<=1;
  59. //if(SPI_MISO_Read())
  60. //Byte++;
  61. //SPI_SCK_LOW();
  62. //}
  63. //return Byte;
  64. while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);
  65. SPI_I2S_SendData(SPI1,0xff);
  66. while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==RESET);
  67. return SPI_I2S_ReceiveData(SPI1);
  68. }
  69. /************************FLASH****************************/

  71. uint8_t FLASH_ReadStatusReg(void)   //读状态寄存器
  72. {
  73. uint8_t Status;
  74. SPI_CS_LOW();        
  75. SPI_SendByte(W25X_ReadStatusReg);      
  76. Status=SPI_ReceiveByte();        
  77. SPI_CS_HIGH();     
  78. return Status;
  79. }

  81. void FLASH_WriteEnable(void)
  82. {
  83. SPI_CS_LOW();
  84. SPI_SendByte(W25X_WriteEnable);
  85. SPI_CS_HIGH();
  86. }
  87. void FLASH_WriteByte(uint32_t Address,uint8_t Byte)
  88. {
  89. FLASH_WriteEnable();//改变磁盘的操作都需要写允许命令
  90. SPI_CS_LOW();
  91. SPI_SendByte(W25X_PageProgram);
  92. SPI_SendByte(Address>>16);
  93. SPI_SendByte(Address>>8);
  94. SPI_SendByte(Address);
  95. SPI_SendByte(Byte);
  96. SPI_CS_HIGH();
  97. while(FLASH_ReadStatusReg()&0x01);
  98. }

  100. void FLASH_ReadByte(uint32_t Address ,uint8_t *pByte)
  101. {
  102. SPI_CS_LOW();
  103. SPI_SendByte(W25X_ReadData);
  104. SPI_SendByte(Address>>16);
  105. SPI_SendByte(Address>>8);
  106. SPI_SendByte(Address);
  107. *pByte=SPI_ReceiveByte();
  108. SPI_CS_HIGH();
  109. }

  111. uint16_t FLASH_ReadID(void)
  112. {
  113. uint16_t Temp=0;
  114. SPI_CS_LOW();
  115. SPI_SendByte(W25X_ManufactDeviceID);
  116. SPI_SendByte(0x00);
  117. SPI_SendByte(0x00);
  118. SPI_SendByte(0x00);
  119. Temp|=SPI_ReceiveByte()<<8;
  120. Temp|=SPI_ReceiveByte();
  121. SPI_CS_HIGH();
  122. return Temp;
  123. }

  125. void FLASH_Erase_Sector(uint32_t Address)
  126. {
  127. FLASH_WriteEnable();
  128. while(FLASH_ReadStatusReg()&0x01);
  129. SPI_CS_LOW();
  130. SPI_SendByte(W25X_SectorErase);
  131. SPI_SendByte(Address>>16);
  132. SPI_SendByte(Address>>8);
  133. SPI_SendByte(Address);
  134. SPI_CS_HIGH();
  135. while(FLASH_ReadStatusReg()&0x01);
  136. }

  138. void FLASH_Wrase_Chip(void)
  139. {
  140. FLASH_WriteEnable();
  141. SPI_SendByte(0x00);
  142. while(FLASH_ReadStatusReg()&0x01);
  143. SPI_CS_LOW();
  144. SPI_SendByte(W25X_ChipErase);
  145. SPI_CS_HIGH();
  146. while(FLASH_ReadStatusReg()&0x01);
  147. }
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