Takehisa Oneta / Mbed 2 deprecated Hello-FM25W256

FM25W256, it was write protect first. 初期状態ではライトプロテクトがかかっていることに対応。 "The WREN command must be issued prior to any write operation." from FM25W256 datasheet.

Dependencies:   FM25W256 mbed

Fork of Hello-FM25W256 by Toyomasa Watarai

main.cpp@0:3efb18460968, 2016-03-04 (annotated)

Committer:
MACRUM
Date:
Fri Mar 04 13:48:22 2016 +0000
Revision:
0:3efb18460968
Child:
1:be908b1aafe6
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MACRUM 0:3efb18460968 1 #include "mbed.h"
MACRUM 0:3efb18460968 2
MACRUM 0:3efb18460968 3 Serial pc(USBTX, USBRX);
MACRUM 0:3efb18460968 4 SPI fram(dp2, dp1, dp6);
MACRUM 0:3efb18460968 5 DigitalOut _cs(dp18);
MACRUM 0:3efb18460968 6
MACRUM 0:3efb18460968 7 #define CMD_WREN 0x06
MACRUM 0:3efb18460968 8 #define CMD_WRDI 0x04
MACRUM 0:3efb18460968 9 #define CMD_RDSR 0x05
MACRUM 0:3efb18460968 10 #define CMD_WRSR 0x01
MACRUM 0:3efb18460968 11 #define CMD_READ 0x03
MACRUM 0:3efb18460968 12 #define CMD_WRITE 0x02
MACRUM 0:3efb18460968 13
MACRUM 0:3efb18460968 14 void write_byte(uint16_t address, uint8_t data)
MACRUM 0:3efb18460968 15 {
MACRUM 0:3efb18460968 16 _cs = 0;
MACRUM 0:3efb18460968 17 fram.write(CMD_WREN);
MACRUM 0:3efb18460968 18 _cs = 1;
MACRUM 0:3efb18460968 19
MACRUM 0:3efb18460968 20 _cs = 0;
MACRUM 0:3efb18460968 21 fram.write(CMD_WRITE);
MACRUM 0:3efb18460968 22 fram.write(address >> 8);
MACRUM 0:3efb18460968 23 fram.write(address & 0xFF);
MACRUM 0:3efb18460968 24 fram.write(data & 0xFF);
MACRUM 0:3efb18460968 25 _cs = 1;
MACRUM 0:3efb18460968 26 }
MACRUM 0:3efb18460968 27
MACRUM 0:3efb18460968 28 uint8_t read_byte(uint16_t address)
MACRUM 0:3efb18460968 29 {
MACRUM 0:3efb18460968 30 uint8_t data;
MACRUM 0:3efb18460968 31
MACRUM 0:3efb18460968 32 _cs = 0;
MACRUM 0:3efb18460968 33 fram.write(CMD_READ);
MACRUM 0:3efb18460968 34 fram.write(address >> 8);
MACRUM 0:3efb18460968 35 fram.write(address & 0xFF);
MACRUM 0:3efb18460968 36 data = fram.write(0);
MACRUM 0:3efb18460968 37 _cs = 1;
MACRUM 0:3efb18460968 38
MACRUM 0:3efb18460968 39 return data;
MACRUM 0:3efb18460968 40 }
MACRUM 0:3efb18460968 41
MACRUM 0:3efb18460968 42 void read_bytes(uint16_t address, uint8_t *buf, uint16_t size)
MACRUM 0:3efb18460968 43 {
MACRUM 0:3efb18460968 44 _cs = 0;
MACRUM 0:3efb18460968 45 fram.write(CMD_READ);
MACRUM 0:3efb18460968 46 fram.write(address >> 8);
MACRUM 0:3efb18460968 47 fram.write(address & 0xFF);
MACRUM 0:3efb18460968 48 while (size--) {
MACRUM 0:3efb18460968 49 *buf++ = fram.write(0);
MACRUM 0:3efb18460968 50 }
MACRUM 0:3efb18460968 51 _cs = 1;
MACRUM 0:3efb18460968 52 }
MACRUM 0:3efb18460968 53
MACRUM 0:3efb18460968 54
MACRUM 0:3efb18460968 55 void read_test()
MACRUM 0:3efb18460968 56 {
MACRUM 0:3efb18460968 57 uint16_t adrs = 0;
MACRUM 0:3efb18460968 58 for(int i=0; i<16; i++) {
MACRUM 0:3efb18460968 59 pc.printf("0x%04X : ", i * 16);
MACRUM 0:3efb18460968 60 for(int j=0; j<16; j++) {
MACRUM 0:3efb18460968 61 //pc.printf("%02X ", fram.write(0));
MACRUM 0:3efb18460968 62 pc.printf("%02X ", read_byte(adrs++));
MACRUM 0:3efb18460968 63 }
MACRUM 0:3efb18460968 64 pc.printf("\n");
MACRUM 0:3efb18460968 65 }
MACRUM 0:3efb18460968 66 }
MACRUM 0:3efb18460968 67
MACRUM 0:3efb18460968 68 void write_test()
MACRUM 0:3efb18460968 69 {
MACRUM 0:3efb18460968 70 for(int i=0; i<256; i++) {
MACRUM 0:3efb18460968 71 write_byte(i, i);
MACRUM 0:3efb18460968 72 }
MACRUM 0:3efb18460968 73 }
MACRUM 0:3efb18460968 74
MACRUM 0:3efb18460968 75 int main()
MACRUM 0:3efb18460968 76 {
MACRUM 0:3efb18460968 77 fram.format(8, 0);
MACRUM 0:3efb18460968 78 fram.frequency(20000000);
MACRUM 0:3efb18460968 79 _cs = 1;
MACRUM 0:3efb18460968 80
MACRUM 0:3efb18460968 81 pc.printf("\nFM25W256 test program - write test? (y/n) ");
MACRUM 0:3efb18460968 82 if (pc.getc() == 'y') {
MACRUM 0:3efb18460968 83 write_test();
MACRUM 0:3efb18460968 84 }
MACRUM 0:3efb18460968 85
MACRUM 0:3efb18460968 86 pc.printf("\nFM25W256 test program - read test? (y/n) ");
MACRUM 0:3efb18460968 87 if (pc.getc() == 'y') {
MACRUM 0:3efb18460968 88 pc.printf("\n");
MACRUM 0:3efb18460968 89 read_test();
MACRUM 0:3efb18460968 90 }
MACRUM 0:3efb18460968 91
MACRUM 0:3efb18460968 92 while(1) {
MACRUM 0:3efb18460968 93 }
MACRUM 0:3efb18460968 94 }