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1e8811362e
flash chip driver to take in the slave number during initialization so this is no longer a hardcoded option.
375 lines
9.5 KiB
C
375 lines
9.5 KiB
C
/**
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******************************************************************************
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*
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* @addtogroup PIOS PIOS Core hardware abstraction layer
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* @{
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* @addtogroup PIOS_FLASH Flash device handler
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* @{
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*
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* @file pios_flash_w25x.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief Driver for talking to W25X flash chip (and most JEDEC chips)
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "pios.h"
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#include "pios_flash_w25x.h"
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#include "pios_adxl345.h"
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#define W25X_WRITE_ENABLE 0x06
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#define W25X_WRITE_DISABLE 0x04
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#define W25X_READ_STATUS 0x05
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#define W25X_WRITE_STATUS 0x01
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#define W25X_READ_DATA 0x03
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#define W25X_FAST_READ 0x0b
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#define W25X_DEVICE_ID 0x90
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#define W25X_SECTOR_ERASE 0xD8
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#define W25X_PAGE_WRITE 0x02
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#define W25X_CHIP_ERASE 0xC7
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#define W25X_STATUS_BUSY 0x01
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#define W25X_STATUS_WRITEPROTECT 0x02
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#define W25X_STATUS_BP0 0x04
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#define W25X_STATUS_BP1 0x08
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#define W25X_STATUS_BP2 0x10
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#define W25X_STATUS_TP 0x20
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#define W25X_STATUS_SEC 0x40
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#define W25X_STATUS_SRP0 0x80
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static uint8_t device_type;
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enum pios_w25x_dev_magic {
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PIOS_W25X_DEV_MAGIC = 0xcb55aa55,
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};
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//! Device handle structure
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struct w25x_flash_dev {
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uint32_t spi_id;
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uint32_t slave_num;
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enum pios_w25x_dev_magic magic;
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};
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//! Global structure for this flash device
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struct w25x_flash_dev * flash_dev;
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//! Private functions
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static int32_t PIOS_Flash_W25X_Validate(struct w25x_flash_dev * dev);
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static struct w25x_flash_dev * PIOS_Flash_W25X_alloc(void);
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static int32_t PIOS_Flash_W25X_ClaimBus();
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static int32_t PIOS_Flash_W25X_ReleaseBus();
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static int32_t PIOS_Flash_W25X_WriteEnable();
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static int32_t PIOS_Flash_W25X_Busy() ;
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/**
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* @brief Allocate a new device
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*/
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static struct w25x_flash_dev * PIOS_Flash_W25X_alloc(void)
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{
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struct w25x_flash_dev * w25x_dev;
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w25x_dev = (struct w25x_flash_dev *)pvPortMalloc(sizeof(*w25x_dev));
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if (!w25x_dev) return (NULL);
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w25x_dev->magic = PIOS_W25X_DEV_MAGIC;
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return(w25x_dev);
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}
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/**
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* @brief Validate the handle to the spi device
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*/
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static int32_t PIOS_Flash_W25X_Validate(struct w25x_flash_dev * dev) {
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if (dev == NULL)
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return -1;
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if (dev->magic != PIOS_W25X_DEV_MAGIC)
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return -2;
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if (dev->spi_id == 0)
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return -3;
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return 0;
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}
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/**
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* @brief Claim the SPI bus for flash use and assert CS pin
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* @return 0 for sucess, -1 for failure to get semaphore
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*/
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static int32_t PIOS_Flash_W25X_ClaimBus()
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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int8_t ret = PIOS_SPI_ClaimBus(flash_dev->spi_id);
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PIOS_SPI_RC_PinSet(flash_dev->spi_id, flash_dev->slave_num, 0);
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return (ret == 0) ? 0 : -1;
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}
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/**
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* @brief Release the SPI bus sempahore and ensure flash chip not using bus
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*/
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static int32_t PIOS_Flash_W25X_ReleaseBus()
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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PIOS_SPI_RC_PinSet(flash_dev->spi_id, flash_dev->slave_num, 1);
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PIOS_SPI_ReleaseBus(flash_dev->spi_id);
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}
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/**
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* @brief Returns if the flash chip is busy
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* @returns -1 for failure, 0 for not busy, 1 for busy
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*/
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static int32_t PIOS_Flash_W25X_Busy()
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{
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int32_t status = PIOS_Flash_W25X_ReadStatus();
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if (status < 0)
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return -1;
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return status & W25X_STATUS_BUSY;
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}
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/**
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* @brief Execute the write enable instruction and returns the status
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* @returns 0 if successful, -1 if unable to claim bus
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*/
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static int32_t PIOS_Flash_W25X_WriteEnable()
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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uint8_t out[] = {W25X_WRITE_ENABLE};
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if(PIOS_Flash_W25X_ClaimBus() != 0)
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return -1;
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PIOS_SPI_TransferBlock(flash_dev->spi_id,out,NULL,sizeof(out),NULL);
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PIOS_Flash_W25X_ReleaseBus();
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return 0;
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}
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/**
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* @brief Initialize the flash device and enable write access
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*/
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int32_t PIOS_Flash_W25X_Init(uint32_t spi_id, uint32_t slave_num)
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{
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flash_dev = PIOS_Flash_W25X_alloc();
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if(flash_dev == NULL)
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return -1;
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flash_dev->spi_id = spi_id;
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flash_dev->slave_num = slave_num;
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device_type = PIOS_Flash_W25X_ReadID();
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return 0;
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}
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/**
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* @brief Read the status register from flash chip and return it
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*/
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int32_t PIOS_Flash_W25X_ReadStatus()
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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uint8_t out[2] = {W25X_READ_STATUS, 0};
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uint8_t in[2] = {0,0};
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if(PIOS_Flash_W25X_ClaimBus() < 0)
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return -1;
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,out,in,sizeof(out),NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -2;
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}
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PIOS_Flash_W25X_ReleaseBus();
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return in[1];
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}
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/**
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* @brief Read the status register from flash chip and return it
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*/
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int32_t PIOS_Flash_W25X_ReadID()
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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uint8_t out[] = {W25X_DEVICE_ID, 0, 0, 0, 0, 0};
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uint8_t in[6];
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if (PIOS_Flash_W25X_ClaimBus() < 0)
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return -1;
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,out,in,sizeof(out),NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -2;
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}
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PIOS_Flash_W25X_ReleaseBus();
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return in[5];
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}
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/**
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* @brief Erase a sector on the flash chip
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* @param[in] add Address of flash to erase
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* @returns 0 if successful
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* @retval -1 if unable to claim bus
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* @retval
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*/
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int32_t PIOS_Flash_W25X_EraseSector(uint32_t addr)
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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uint8_t ret;
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uint8_t out[] = {W25X_SECTOR_ERASE, (addr >> 16) & 0xff, (addr >> 8) & 0xff , addr & 0xff};
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if((ret = PIOS_Flash_W25X_WriteEnable()) != 0)
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return ret;
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if(PIOS_Flash_W25X_ClaimBus() != 0)
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return -1;
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,out,NULL,sizeof(out),NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -2;
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}
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PIOS_Flash_W25X_ReleaseBus();
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// Keep polling when bus is busy too
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while(PIOS_Flash_W25X_Busy() != 0) {
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}
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return 0;
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}
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/**
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* @brief Execute the whole chip
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* @returns 0 if successful, -1 if unable to claim bus
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*/
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int32_t PIOS_Flash_W25X_EraseChip()
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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uint8_t ret;
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uint8_t out[] = {W25X_CHIP_ERASE};
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if((ret = PIOS_Flash_W25X_WriteEnable()) != 0)
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return ret;
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if(PIOS_Flash_W25X_ClaimBus() != 0)
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return -1;
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,out,NULL,sizeof(out),NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -2;
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}
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PIOS_Flash_W25X_ReleaseBus();
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// Keep polling when bus is busy too
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while(PIOS_Flash_W25X_Busy() != 0) {
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}
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return 0;
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}
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/**
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* @brief Write one page of data (up to 256 bytes) aligned to a page start
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* @param[in] addr Address in flash to write to
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* @param[in] data Pointer to data to write to flash
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* @param[in] len Length of data to write (max 256 bytes)
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* @return Zero if success or error code
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* @retval -1 Unable to claim SPI bus
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* @retval -2 Size exceeds 256 bytes
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* @retval -3 Length to write would wrap around page boundary
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*/
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int32_t PIOS_Flash_W25X_WriteData(uint32_t addr, uint8_t * data, uint16_t len)
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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uint8_t ret;
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uint8_t out[4] = {W25X_PAGE_WRITE, (addr >> 16) & 0xff, (addr >> 8) & 0xff , addr & 0xff};
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/* Can only write one page at a time */
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if(len > 0x100)
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return -2;
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/* Ensure number of bytes fits after starting address before end of page */
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if(((addr & 0xff) + len) > 0x100)
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return -3;
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if((ret = PIOS_Flash_W25X_WriteEnable()) != 0)
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return ret;
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/* Execute write page command and clock in address. Keep CS asserted */
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if(PIOS_Flash_W25X_ClaimBus() != 0)
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return -1;
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,out,NULL,sizeof(out),NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -1;
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}
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/* Clock out data to flash */
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,data,NULL,len,NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -1;
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}
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PIOS_Flash_W25X_ReleaseBus();
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// Keep polling while bus is busy too
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while(PIOS_Flash_W25X_Busy() != 0) {
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}
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return 0;
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}
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/**
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* @brief Read data from a location in flash memory
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* @param[in] addr Address in flash to write to
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* @param[in] data Pointer to data to write from flash
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* @param[in] len Length of data to write (max 256 bytes)
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* @return Zero if success or error code
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* @retval -1 Unable to claim SPI bus
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*/
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int32_t PIOS_Flash_W25X_ReadData(uint32_t addr, uint8_t * data, uint16_t len)
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{
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if(PIOS_Flash_W25X_Validate(flash_dev) != 0)
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return -1;
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if(PIOS_Flash_W25X_ClaimBus() == -1)
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return -1;
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/* Execute read command and clock in address. Keep CS asserted */
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uint8_t out[] = {W25X_READ_DATA, (addr >> 16) & 0xff, (addr >> 8) & 0xff , addr & 0xff};
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,out,NULL,sizeof(out),NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -2;
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}
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/* Copy the transfer data to the buffer */
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if(PIOS_SPI_TransferBlock(flash_dev->spi_id,NULL,data,len,NULL) < 0) {
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PIOS_Flash_W25X_ReleaseBus();
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return -3;
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}
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PIOS_Flash_W25X_ReleaseBus();
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return 0;
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}
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