USB MSD using the AHBSRAM banks 0 and 1 to create a 32k RAM disk. After FAT format 12kb is writable
Dependencies: USBDevice USBMSD_RAM mbed
Fork of USB-MSD_SD_HelloWorld_Mbed-RAMVersion by
Revision 20:50bf1cd2e2fe, committed 2011-12-11
- Comitter:
- samux
- Date:
- Sun Dec 11 15:56:08 2011 +0000
- Parent:
- 19:148a0b8d23bc
- Child:
- 21:bbe291251dde
- Commit message:
- big cleaning up
Changed in this revision
--- a/USBDevice/USBMSD/USBMSD.cpp Sun Dec 11 15:42:23 2011 +0000 +++ b/USBDevice/USBMSD/USBMSD.cpp Sun Dec 11 15:56:08 2011 +0000 @@ -18,15 +18,14 @@ #include "stdint.h" #include "USBMSD.h" -#include "USBBusInterface.h" #define DISK_OK 0x00 #define NO_INIT 0x01 #define NO_DISK 0x02 #define WRITE_PROTECT 0x04 -#define CBW_Signature 0x43425355 -#define CSW_Signature 0x53425355 +#define CBW_Signature 0x43425355 +#define CSW_Signature 0x53425355 // SCSI Commands #define TEST_UNIT_READY 0x00 @@ -48,12 +47,12 @@ #define MODE_SENSE10 0x5A // MSC class specific requests -#define MSC_REQUEST_RESET 0xFF -#define MSC_REQUEST_GET_MAX_LUN 0xFE +#define MSC_REQUEST_RESET 0xFF +#define MSC_REQUEST_GET_MAX_LUN 0xFE #define DEFAULT_CONFIGURATION (1) -// Max In/Out Packet Size on the bulk endpoint */ +// max packet size #define MAX_PACKET MAX_PACKET_SIZE_EPBULK // CSW Status @@ -74,6 +73,7 @@ bool success = false; CONTROL_TRANSFER * transfer = getTransferPtr(); + uint8_t maxLUN[1] = {0}; if (transfer->setup.bmRequestType.Type == CLASS_TYPE) { switch (transfer->setup.bRequest) { @@ -83,7 +83,7 @@ break; case MSC_REQUEST_GET_MAX_LUN: transfer->remaining = 1; - transfer->ptr = getMaxLUN(); + transfer->ptr = maxLUN; transfer->direction = DEVICE_TO_HOST; success = true; break; @@ -95,7 +95,7 @@ return success; } -DigitalOut l1(LED1); + bool USBMSD::connect() { //disk initialization @@ -132,10 +132,6 @@ stage = READ_CBW; } -uint8_t * USBMSD::getMaxLUN() { - static uint8_t LUN[] = {0}; - return LUN; -} // Called in ISR context called when a data is received bool USBMSD::EP2_OUT_callback() { @@ -353,20 +349,20 @@ bool USBMSD::requestSense (void) { uint8_t request_sense[] = { - 0x70, // Response Code + 0x70, 0x00, 0x05, // Sense Key: illegal request 0x00, 0x00, 0x00, 0x00, - 0x0A, // Additional Length + 0x0A, 0x00, 0x00, 0x00, 0x00, - 0x30, // ASC - 0x01, // ASCQ + 0x30, + 0x01, 0x00, 0x00, 0x00,
--- a/USBDevice/USBMSD/USBMSD.h Sun Dec 11 15:42:23 2011 +0000 +++ b/USBDevice/USBMSD/USBMSD.h Sun Dec 11 15:56:08 2011 +0000 @@ -32,7 +32,7 @@ * - virtual int disk_size(): return the memory size * - virtual int disk_status(): return the status of the storage chip * - * All functions names are compatible with the fat filesystem library. So you can imagine using your own class with + * All functions names are compatible with the fat filesystem library. So you can imagine using your own class with * USBMSD and the fat filesystem library in the same program. Just be careful because there are two different parts which * will access the sd card. You can do a master/slave system using the disk_status method. * @@ -50,38 +50,6 @@ #include "USBDevice.h" -#define DEFAULT_CONFIGURATION (1) - - -// MSC Bulk-only Stage -enum Stage { - READ_CBW, // wait a CBW - ERROR, // error - PROCESS_CBW, // process a CBW request - SEND_CSW, // send a CSW - WAIT_CSW, // wait that a CSW has been effectively sent -}; - -// Bulk-only CBW -typedef __packed struct { - uint32_t Signature; - uint32_t Tag; - uint32_t DataLength; - uint8_t Flags; - uint8_t LUN; - uint8_t CBLength; - uint8_t CB[16]; -} CBW; - -// Bulk-only CSW -typedef __packed struct { - uint32_t Signature; - uint32_t Tag; - uint32_t DataResidue; - uint8_t Status; -} CSW; - - class USBMSD: public USBDevice { public: @@ -94,6 +62,16 @@ */ USBMSD(uint16_t vendor_id = 0x0703, uint16_t product_id = 0x0104, uint16_t product_release = 0x0001); + /** + * Connect the USB MSD device. Establish disk initialization before really connect the device. + * + * @returns true if successful + */ + bool connect(); + + +protected: + /* * read a block on a storage chip * @@ -130,8 +108,8 @@ * @returns memory size */ virtual int disk_size() = 0; - - + + /* * To check the status of the storage chip * @@ -140,24 +118,6 @@ virtual int disk_status() = 0; /* - * Connect the USB MSD device. Establish disk initialization before really connect the device. - * - * @returns - */ - bool connect(); - - -protected: - - - /* - * Get number of logical unit - 1 (here 0) - * - * @returns Pointer containing the number of logical unit - 1 - */ - uint8_t * getMaxLUN(); - - /* * Get string product descriptor * * @returns pointer to the string product descriptor @@ -200,6 +160,35 @@ private: + + // MSC Bulk-only Stage + enum Stage { + READ_CBW, // wait a CBW + ERROR, // error + PROCESS_CBW, // process a CBW request + SEND_CSW, // send a CSW + WAIT_CSW, // wait that a CSW has been effectively sent + }; + + // Bulk-only CBW + typedef __packed struct { + uint32_t Signature; + uint32_t Tag; + uint32_t DataLength; + uint8_t Flags; + uint8_t LUN; + uint8_t CBLength; + uint8_t CB[16]; + } CBW; + + // Bulk-only CSW + typedef __packed struct { + uint32_t Signature; + uint32_t Tag; + uint32_t DataResidue; + uint8_t Status; + } CSW; + //state of the bulk-only state machine Stage stage;
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBMSD_SD.lib Sun Dec 11 15:56:08 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/samux/libraries/USBMSD_SD/m20kgz \ No newline at end of file
--- a/USBMSD_SD/.lib Sun Dec 11 15:42:23 2011 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -http://mbed.org/users/samux/libraries/USBMSD_SD/m20o3f \ No newline at end of file
--- a/USBMSD_SD/USBMSD_SD.cpp Sun Dec 11 15:42:23 2011 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,467 +0,0 @@ -/* mbed USBMSD_SD Library, for providing file access to SD cards - * Copyright (c) 2008-2010, sford - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ - -/* Introduction - * ------------ - * SD and MMC cards support a number of interfaces, but common to them all - * is one based on SPI. This is the one I'm implmenting because it means - * it is much more portable even though not so performant, and we already - * have the mbed SPI Interface! - * - * The main reference I'm using is Chapter 7, "SPI Mode" of: - * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf - * - * SPI Startup - * ----------- - * The SD card powers up in SD mode. The SPI interface mode is selected by - * asserting CS low and sending the reset command (CMD0). The card will - * respond with a (R1) response. - * - * CMD8 is optionally sent to determine the voltage range supported, and - * indirectly determine whether it is a version 1.x SD/non-SD card or - * version 2.x. I'll just ignore this for now. - * - * ACMD41 is repeatedly issued to initialise the card, until "in idle" - * (bit 0) of the R1 response goes to '0', indicating it is initialised. - * - * You should also indicate whether the host supports High Capicity cards, - * and check whether the card is high capacity - i'll also ignore this - * - * SPI Protocol - * ------------ - * The SD SPI protocol is based on transactions made up of 8-bit words, with - * the host starting every bus transaction by asserting the CS signal low. The - * card always responds to commands, data blocks and errors. - * - * The protocol supports a CRC, but by default it is off (except for the - * first reset CMD0, where the CRC can just be pre-calculated, and CMD8) - * I'll leave the CRC off I think! - * - * Standard capacity cards have variable data block sizes, whereas High - * Capacity cards fix the size of data block to 512 bytes. I'll therefore - * just always use the Standard Capacity cards with a block size of 512 bytes. - * This is set with CMD16. - * - * You can read and write single blocks (CMD17, CMD25) or multiple blocks - * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When - * the card gets a read command, it responds with a response token, and then - * a data token or an error. - * - * SPI Command Format - * ------------------ - * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC. - * - * +---------------+------------+------------+-----------+----------+--------------+ - * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 | - * +---------------+------------+------------+-----------+----------+--------------+ - * - * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95) - * - * All Application Specific commands shall be preceded with APP_CMD (CMD55). - * - * SPI Response Format - * ------------------- - * The main response format (R1) is a status byte (normally zero). Key flags: - * idle - 1 if the card is in an idle state/initialising - * cmd - 1 if an illegal command code was detected - * - * +-------------------------------------------------+ - * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle | - * +-------------------------------------------------+ - * - * R1b is the same, except it is followed by a busy signal (zeros) until - * the first non-zero byte when it is ready again. - * - * Data Response Token - * ------------------- - * Every data block written to the card is acknowledged by a byte - * response token - * - * +----------------------+ - * | xxx | 0 | status | 1 | - * +----------------------+ - * 010 - OK! - * 101 - CRC Error - * 110 - Write Error - * - * Single Block Read and Write - * --------------------------- - * - * Block transfers have a byte header, followed by the data, followed - * by a 16-bit CRC. In our case, the data will always be 512 bytes. - * - * +------+---------+---------+- - - -+---------+-----------+----------+ - * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] | - * +------+---------+---------+- - - -+---------+-----------+----------+ - */ - -#include "USBMSD_SD.h" - -#define SD_COMMAND_TIMEOUT 5000 - -USBMSD_SD::USBMSD_SD(PinName mosi, PinName miso, PinName sclk, PinName cs) : - _spi(mosi, miso, sclk), _cs(cs) { - _cs = 1; - //no init - _status = 0x01; - connect(); -} - -#define R1_IDLE_STATE (1 << 0) -#define R1_ERASE_RESET (1 << 1) -#define R1_ILLEGAL_COMMAND (1 << 2) -#define R1_COM_CRC_ERROR (1 << 3) -#define R1_ERASE_SEQUENCE_ERROR (1 << 4) -#define R1_ADDRESS_ERROR (1 << 5) -#define R1_PARAMETER_ERROR (1 << 6) - -// Types -// - v1.x Standard Capacity -// - v2.x Standard Capacity -// - v2.x High Capacity -// - Not recognised as an SD Card - -#define SDCARD_FAIL 0 -#define SDCARD_V1 1 -#define SDCARD_V2 2 -#define SDCARD_V2HC 3 - -int USBMSD_SD::initialise_card() { - // Set to 100kHz for initialisation, and clock card with cs = 1 - _spi.frequency(100000); - _cs = 1; - for(int i=0; i<16; i++) { - _spi.write(0xFF); - } - - // send CMD0, should return with all zeros except IDLE STATE set (bit 0) - if(_cmd(0, 0) != R1_IDLE_STATE) { - fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n"); - return SDCARD_FAIL; - } - - // send CMD8 to determine whther it is ver 2.x - int r = _cmd8(); - if(r == R1_IDLE_STATE) { - return initialise_card_v2(); - } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) { - return initialise_card_v1(); - } else { - fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n"); - return SDCARD_FAIL; - } -} - -int USBMSD_SD::initialise_card_v1() { - for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { - _cmd(55, 0); - if(_cmd(41, 0) == 0) { - return SDCARD_V1; - } - } - - fprintf(stderr, "Timeout waiting for v1.x card\n"); - return SDCARD_FAIL; -} - -int USBMSD_SD::initialise_card_v2() { - - for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { - _cmd(55, 0); - if(_cmd(41, 0) == 0) { - _cmd58(); - return SDCARD_V2; - } - } - - fprintf(stderr, "Timeout waiting for v2.x card\n"); - return SDCARD_FAIL; -} - -int USBMSD_SD::disk_initialize() { - - int i = initialise_card(); -// printf("init card = %d\n", i); -// printf("OK\n"); - - _sectors = _sd_sectors(); - - // Set block length to 512 (CMD16) - if(_cmd(16, 512) != 0) { - fprintf(stderr, "Set 512-byte block timed out\n"); - return 1; - } - - _spi.frequency(5000000); // Set to 5MHz for data transfer - // OK - _status = 0x00; - return 0; -} - -int USBMSD_SD::disk_write(const char *buffer, int block_number) { - // set write address for single block (CMD24) - if(_cmd(24, block_number * 512) != 0) { - return 1; - } - - // send the data block - _write(buffer, 512); - return 0; -} - -int USBMSD_SD::disk_read(char *buffer, int block_number) { - // set read address for single block (CMD17) - if(_cmd(17, block_number * 512) != 0) { - return 1; - } - - // receive the data - _read(buffer, 512); - return 0; -} - -int USBMSD_SD::disk_status() { return _status; } -int USBMSD_SD::disk_sync() { return 0; } -int USBMSD_SD::disk_sectors() { return _sectors; } - -// PRIVATE FUNCTIONS - -int USBMSD_SD::_cmd(int cmd, int arg) { - _cs = 0; - - // send a command - _spi.write(0x40 | cmd); - _spi.write(arg >> 24); - _spi.write(arg >> 16); - _spi.write(arg >> 8); - _spi.write(arg >> 0); - _spi.write(0x95); - - // wait for the repsonse (response[7] == 0) - for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { - int response = _spi.write(0xFF); - if(!(response & 0x80)) { - _cs = 1; - _spi.write(0xFF); - return response; - } - } - _cs = 1; - _spi.write(0xFF); - return -1; // timeout -} -int USBMSD_SD::_cmdx(int cmd, int arg) { - _cs = 0; - - // send a command - _spi.write(0x40 | cmd); - _spi.write(arg >> 24); - _spi.write(arg >> 16); - _spi.write(arg >> 8); - _spi.write(arg >> 0); - _spi.write(0x95); - - // wait for the repsonse (response[7] == 0) - for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { - int response = _spi.write(0xFF); - if(!(response & 0x80)) { - return response; - } - } - _cs = 1; - _spi.write(0xFF); - return -1; // timeout -} - - -int USBMSD_SD::_cmd58() { - _cs = 0; - int arg = 0; - - // send a command - _spi.write(0x40 | 58); - _spi.write(arg >> 24); - _spi.write(arg >> 16); - _spi.write(arg >> 8); - _spi.write(arg >> 0); - _spi.write(0x95); - - // wait for the repsonse (response[7] == 0) - for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { - int response = _spi.write(0xFF); - if(!(response & 0x80)) { - int ocr = _spi.write(0xFF) << 24; - ocr |= _spi.write(0xFF) << 16; - ocr |= _spi.write(0xFF) << 8; - ocr |= _spi.write(0xFF) << 0; -// printf("OCR = 0x%08X\n", ocr); - _cs = 1; - _spi.write(0xFF); - return response; - } - } - _cs = 1; - _spi.write(0xFF); - return -1; // timeout -} - -int USBMSD_SD::_cmd8() { - _cs = 0; - - // send a command - _spi.write(0x40 | 8); // CMD8 - _spi.write(0x00); // reserved - _spi.write(0x00); // reserved - _spi.write(0x01); // 3.3v - _spi.write(0xAA); // check pattern - _spi.write(0x87); // crc - - // wait for the repsonse (response[7] == 0) - for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) { - char response[5]; - response[0] = _spi.write(0xFF); - if(!(response[0] & 0x80)) { - for(int j=1; j<5; j++) { - response[i] = _spi.write(0xFF); - } - _cs = 1; - _spi.write(0xFF); - return response[0]; - } - } - _cs = 1; - _spi.write(0xFF); - return -1; // timeout -} - -int USBMSD_SD::_read(char *buffer, int length) { - _cs = 0; - - // read until start byte (0xFF) - while(_spi.write(0xFF) != 0xFE); - - // read data - for(int i=0; i<length; i++) { - buffer[i] = _spi.write(0xFF); - } - _spi.write(0xFF); // checksum - _spi.write(0xFF); - - _cs = 1; - _spi.write(0xFF); - return 0; -} - -int USBMSD_SD::_write(const char *buffer, int length) { - _cs = 0; - - // indicate start of block - _spi.write(0xFE); - - // write the data - for(int i=0; i<length; i++) { - _spi.write(buffer[i]); - } - - // write the checksum - _spi.write(0xFF); - _spi.write(0xFF); - - // check the repsonse token - if((_spi.write(0xFF) & 0x1F) != 0x05) { - _cs = 1; - _spi.write(0xFF); - return 1; - } - - // wait for write to finish - while(_spi.write(0xFF) == 0); - - _cs = 1; - _spi.write(0xFF); - return 0; -} - -static int ext_bits(char *data, int msb, int lsb) { - int bits = 0; - int size = 1 + msb - lsb; - for(int i=0; i<size; i++) { - int position = lsb + i; - int byte = 15 - (position >> 3); - int bit = position & 0x7; - int value = (data[byte] >> bit) & 1; - bits |= value << i; - } - return bits; -} - -int USBMSD_SD::_sd_sectors() { - - // CMD9, Response R2 (R1 byte + 16-byte block read) - if(_cmdx(9, 0) != 0) { - fprintf(stderr, "Didn't get a response from the disk\n"); - return 0; - } - - char csd[16]; - if(_read(csd, 16) != 0) { - fprintf(stderr, "Couldn't read csd response from disk\n"); - return 0; - } - - // csd_structure : csd[127:126] - // c_size : csd[73:62] - // c_size_mult : csd[49:47] - // read_bl_len : csd[83:80] - the *maximum* read block length - - int csd_structure = ext_bits(csd, 127, 126); - int c_size = ext_bits(csd, 73, 62); - int c_size_mult = ext_bits(csd, 49, 47); - int read_bl_len = ext_bits(csd, 83, 80); - -// printf("CSD_STRUCT = %d\n", csd_structure); - - if(csd_structure != 0) { - fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n"); - return 0; - } - - // memory capacity = BLOCKNR * BLOCK_LEN - // where - // BLOCKNR = (C_SIZE+1) * MULT - // MULT = 2^(C_SIZE_MULT+2) (C_SIZE_MULT < 8) - // BLOCK_LEN = 2^READ_BL_LEN, (READ_BL_LEN < 12) - - int block_len = 1 << read_bl_len; - int mult = 1 << (c_size_mult + 2); - int blocknr = (c_size + 1) * mult; - capacity = blocknr * block_len; - - int blocks = capacity / 512; - - return blocks; -} - - -int USBMSD_SD::disk_size() { - return capacity; -}
--- a/USBMSD_SD/USBMSD_SD.h Sun Dec 11 15:42:23 2011 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,85 +0,0 @@ -/* mbed USBMSD_SD Library, for providing file access to SD cards - * Copyright (c) 2008-2010, sford - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ - -#ifndef USBMSD_SD_H -#define USBMSD_SD_H - -#include "mbed.h" -#include "USBMSD.h" - -/** Use the SDcard as mass storage device using the USBMSD class - * - * @code - * #include "mbed.h" - * #include "USBMSD_SD.h" - * - * USBMSD_SD sd(p5, p6, p7, p8); - * - * int main() { - * while(1); - * } - * - * @endcode - */ -class USBMSD_SD : public USBMSD { -public: - - /** Create the File System for accessing an SD Card using SPI - * - * @param mosi SPI mosi pin connected to SD Card - * @param miso SPI miso pin conencted to SD Card - * @param sclk SPI sclk pin connected to SD Card - * @param cs DigitalOut pin used as SD Card chip select - * @param name The name used to access the virtual filesystem - */ - USBMSD_SD(PinName mosi, PinName miso, PinName sclk, PinName cs); - virtual int disk_initialize(); - virtual int disk_write(const char *buffer, int block_number); - virtual int disk_read(char *buffer, int block_number); - virtual int disk_status(); - virtual int disk_sync(); - virtual int disk_sectors(); - virtual int disk_size(); - -protected: - - int _cmd(int cmd, int arg); - int _cmdx(int cmd, int arg); - int _cmd8(); - int _cmd58(); - int initialise_card(); - int initialise_card_v1(); - int initialise_card_v2(); - - int _read(char *buffer, int length); - int _write(const char *buffer, int length); - int _sd_sectors(); - int _sectors; - - int capacity; - int _status; - - SPI _spi; - DigitalOut _cs; -}; - -#endif