Arduino SPI + SPI Flash芯片W25Q80BV

  1 /*
  2     communication with W25Q80BV (1 MBYTE SPI FLASH) using Arduino Pro Mini 3.3V/8MHz
  3     Reference: http://www.instructables.com/id/How-to-Design-with-Discrete-SPI-Flash-Memory/?ALLSTEPS
  4 */
  5 
  6 // the SPI bus uses pins 10 (SS), 11 (MOSI), 12 (MISO), and 13 (SCK)
  7 
  8 #include <SPI.h>
  9 
 10 #define READ_JEDEC_ID 0x9F
 11 #define READ_STATUS_1 0x05
 12 #define READ_DATA 0x03
 13 #define WRITE_ENABLE 0x06
 14 #define PAGE_PROGRAM 0x02
 15 #define CHIP_ERASE 0xC7
 16 
 17 byte pageBuffer[256];
 18 char str[] = "An apple a day keeps the doctor away."; //short than 256
 19 
 20 void setup()
 21 {
 22     SPI.begin();
 23     SPI.setDataMode(SPI_MODE0);
 24     SPI.setBitOrder(MSBFIRST);
 25     Serial.begin(9600);
 26 
 27     ReadID();
 28     EraseChip();
 29     WritePage(0x1234, str, sizeof(str));
 30 }
 31 
 32 void loop()
 33 {
 34     ReadPage(0x1234, pageBuffer, sizeof(str));
 35 
 36     for(int i; i < sizeof(str); i++)
 37     {
 38         Serial.print(char(pageBuffer[i]));
 39     }
 40     Serial.println();
 41 
 42     delay(2000);
 43 }
 44 
 45 void CheckBusy()
 46 {
 47     digitalWrite(SS, HIGH);
 48     digitalWrite(SS, LOW);
 49     SPI.transfer(READ_STATUS_1);
 50     while(SPI.transfer(0) & 0x01); 
 51     digitalWrite(SS, HIGH);
 52 }
 53 
 54 void ReadID()
 55 {
 56     digitalWrite(SS, HIGH);
 57     digitalWrite(SS, LOW);
 58     SPI.transfer(READ_JEDEC_ID);
 59     byte manuID = SPI.transfer(0);
 60     byte memoType = SPI.transfer(0);
 61     byte capa = SPI.transfer(0);
 62     digitalWrite(SS, HIGH);
 63 
 64     Serial.print("Manufacturer ID: "); Serial.println(manuID, HEX);
 65     Serial.print("Memory Type: "); Serial.println(memoType, HEX);
 66     Serial.print("Capacity : "); Serial.println(capa, HEX);
 67 
 68     CheckBusy();
 69 }
 70 
 71 void ReadPage(word pageNumber, byte pageBuffer[], int length) 
 72 {
 73     // pageNumber: 16-bit data
 74     digitalWrite(SS, HIGH);
 75     digitalWrite(SS, LOW);
 76     SPI.transfer(READ_DATA);
 77     SPI.transfer((pageNumber >> 8) & 0xFF);
 78     SPI.transfer(pageNumber & 0xFF);
 79     SPI.transfer(0);
 80     for(int i = 0; i < length; i++)
 81     {
 82         pageBuffer[i] = SPI.transfer(0);
 83     }
 84     digitalWrite(SS, HIGH);
 85     CheckBusy();
 86 }
 87 
 88 void WritePage(word pageNumber, char pageBuffer[], int length) 
 89 {
 90     digitalWrite(SS, HIGH);
 91     digitalWrite(SS, LOW);  
 92     SPI.transfer(WRITE_ENABLE);
 93     digitalWrite(SS, HIGH);
 94     digitalWrite(SS, LOW);  
 95     SPI.transfer(PAGE_PROGRAM);
 96     SPI.transfer((pageNumber >>  8) & 0xFF);
 97     SPI.transfer(pageNumber & 0xFF);
 98     SPI.transfer(0);
 99     for(int i = 0; i < length; i++)
100     {
101         SPI.transfer(byte(pageBuffer[i]));
102     }
103     digitalWrite(SS, HIGH);
104     CheckBusy();
105 }
106 
107 void EraseChip()
108 {
109     digitalWrite(SS, HIGH);
110     digitalWrite(SS, LOW);  
111     SPI.transfer(WRITE_ENABLE);
112     digitalWrite(SS, HIGH);
113     digitalWrite(SS, LOW);  
114     SPI.transfer(CHIP_ERASE);
115     digitalWrite(SS, HIGH);
116     CheckBusy();
117 }