Daiki Kato / sd-driver-hs

High-speed access version sd-driver.

Dependents:   SDBlockDevice_GR_PEACH SDBlockDevice_GR_PEACH HagridOS5

This library has modified SDBlockDevice.h based on revision "14: c7dba87" of sd-driver.
https://github.com/ARMmbed/sd-driver

features/filesystem/spif/README.md@0:b22a1df967cb, 2017-03-23 (annotated)

Committer:
dkato
Date:
Thu Mar 23 08:25:54 2017 +0000
Revision:
0:b22a1df967cb
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dkato 0:b22a1df967cb 1 # SPI Flash Driver
dkato 0:b22a1df967cb 2
dkato 0:b22a1df967cb 3 Block device driver for NOR based SPI flash devices that support SFDP.
dkato 0:b22a1df967cb 4
dkato 0:b22a1df967cb 5 NOR based SPI flash supports byte-sized read and writes, with an erase size of around 4kbytes. An erase sets a block to all 1s, with successive writes clearing set bits.
dkato 0:b22a1df967cb 6
dkato 0:b22a1df967cb 7 More info on NOR flash can be found on wikipedia:
dkato 0:b22a1df967cb 8 https://en.wikipedia.org/wiki/Flash_memory#NOR_memories
dkato 0:b22a1df967cb 9
dkato 0:b22a1df967cb 10 ``` cpp
dkato 0:b22a1df967cb 11 // Here's an example using the MX25R SPI flash device on the K82F
dkato 0:b22a1df967cb 12 #include "mbed.h"
dkato 0:b22a1df967cb 13 #include "SPIFBlockDevice.h"
dkato 0:b22a1df967cb 14
dkato 0:b22a1df967cb 15 // Create flash device on SPI bus with PTE5 as chip select
dkato 0:b22a1df967cb 16 SPIFBlockDevice spif(PTE2, PTE4, PTE1, PTE5);
dkato 0:b22a1df967cb 17
dkato 0:b22a1df967cb 18 int main()
dkato 0:b22a1df967cb 19 {
dkato 0:b22a1df967cb 20 printf("spif test\n");
dkato 0:b22a1df967cb 21
dkato 0:b22a1df967cb 22 // Initialize the SPI flash device and print the memory layout
dkato 0:b22a1df967cb 23 spif.init();
dkato 0:b22a1df967cb 24 printf("spif size: %llu\n", spif.size());
dkato 0:b22a1df967cb 25 printf("spif read size: %llu\n", spif.get_read_size());
dkato 0:b22a1df967cb 26 printf("spif program size: %llu\n", spif.get_program_size());
dkato 0:b22a1df967cb 27 printf("spif erase size: %llu\n", spif.get_erase_size());
dkato 0:b22a1df967cb 28
dkato 0:b22a1df967cb 29 // Write "Hello World!" to the first block
dkato 0:b22a1df967cb 30 uint8_t *buffer = malloc(spif.get_erase_size());
dkato 0:b22a1df967cb 31 sprintf(buffer, "Hello World!\n");
dkato 0:b22a1df967cb 32 spif.erase(0, spif.get_erase_size());
dkato 0:b22a1df967cb 33 spif.program(buffer, 0, spif.get_erase_size());
dkato 0:b22a1df967cb 34
dkato 0:b22a1df967cb 35 // Read back what was stored
dkato 0:b22a1df967cb 36 spif.read(buffer, 0, spif.get_erase_size());
dkato 0:b22a1df967cb 37 printf("%s", buffer);
dkato 0:b22a1df967cb 38
dkato 0:b22a1df967cb 39 // Deinitialize the device
dkato 0:b22a1df967cb 40 spif.deinit();
dkato 0:b22a1df967cb 41 }
dkato 0:b22a1df967cb 42 ```
dkato 0:b22a1df967cb 43