kopia lustrzana https://github.com/OpenRTX/OpenRTX
Low-level driver for external SPI flash memory on MDx family devices
Silvano Seva
rodzic
bd176d7142
commit
9b14e9fae7
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/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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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, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include "extFlash_MDx.h"
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#include <gpio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <hwconfig.h>
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#define CMD_READ 0x03 /* Read data */
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#define CMD_RSEC 0x48 /* Read security register */
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#define CMD_WKUP 0xAB /* Release power down */
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#define CMD_PDWN 0xB9 /* Power down */
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uint8_t _spi1SendRecv(uint8_t val)
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{
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SPI1->DR = val;
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while((SPI1->SR & SPI_SR_RXNE) == 0) ;
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return SPI1->DR;
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}
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void extFlash_init()
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{
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gpio_setMode(FLASH_CLK, ALTERNATE);
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gpio_setMode(FLASH_SDO, ALTERNATE);
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gpio_setMode(FLASH_SDI, ALTERNATE);
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gpio_setAlternateFunction(FLASH_CLK, 5); /* SPI1 is on AF5 */
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gpio_setAlternateFunction(FLASH_SDO, 5);
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gpio_setAlternateFunction(FLASH_SDI, 5);
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gpio_setMode(FLASH_CS, OUTPUT);
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gpio_setPin(FLASH_CS);
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RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
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__DSB();
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SPI1->CR1 = SPI_CR1_SSM /* Software managment of nCS */
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| SPI_CR1_SSI /* Force internal nCS */
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| SPI_CR1_BR_2 /* Fclock: 84MHz/64 = 1.3MHz */
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| SPI_CR1_BR_0
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| SPI_CR1_MSTR /* Master mode */
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| SPI_CR1_SPE; /* Enable peripheral */
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}
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void extFlash_shutdown()
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{
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extFlash_sleep();
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RCC->APB2ENR &= ~RCC_APB2ENR_SPI1EN;
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__DSB();
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gpio_setMode(FLASH_CLK, INPUT);
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gpio_setMode(FLASH_SDO, INPUT);
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gpio_setMode(FLASH_SDI, INPUT);
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gpio_setMode(FLASH_CS, INPUT);
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}
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void extFlash_wakeup()
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{
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gpio_clearPin(FLASH_CS);
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(void) _spi1SendRecv(CMD_WKUP);
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gpio_setPin(FLASH_CS);
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}
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void extFlash_sleep()
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{
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gpio_clearPin(FLASH_CS);
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(void) _spi1SendRecv(CMD_PDWN);
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gpio_setPin(FLASH_CS);
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}
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ssize_t extFlash_readSecurityRegister(uint32_t addr, uint8_t* buf, size_t len)
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{
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uint32_t addrBase = addr & 0x3000;
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uint32_t addrRange = addr & 0xCFFF;
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if((addrBase < 0x1000) || (addrBase > 0x3000)) return -1; /* Out of base */
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if(addrRange > 0xFF) return -1; /* Out of range */
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/* Keep 256-byte boundary to avoid wrap-around when reading */
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size_t readLen = len;
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if((addrRange + len) > 0xFF)
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{
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readLen = len + (addrRange & 0xFF);
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}
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gpio_clearPin(FLASH_CS);
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(void) _spi1SendRecv(CMD_RSEC); /* Command */
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(void) _spi1SendRecv((addr >> 16) & 0xFF); /* Address high */
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(void) _spi1SendRecv((addr >> 8) & 0xFF); /* Address middle */
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(void) _spi1SendRecv(addr & 0xFF); /* Address low */
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(void) _spi1SendRecv(0x00); /* Dummy byte */
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for(size_t i = 0; i < readLen; i++)
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{
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buf[i] = _spi1SendRecv(0x00);
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}
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gpio_setPin(FLASH_CS);
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return ((ssize_t) readLen);
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}
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void extFlash_readData(uint32_t addr, uint8_t* buf, size_t len)
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{
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gpio_clearPin(FLASH_CS);
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(void) _spi1SendRecv(CMD_READ); /* Command */
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(void) _spi1SendRecv((addr >> 16) & 0xFF); /* Address high */
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(void) _spi1SendRecv((addr >> 8) & 0xFF); /* Address middle */
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(void) _spi1SendRecv(addr & 0xFF); /* Address low */
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(void) _spi1SendRecv(0x00); /* Dummy byte */
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for(size_t i = 0; i < len; i++)
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{
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buf[i] = _spi1SendRecv(0x00);
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}
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gpio_setPin(FLASH_CS);
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}
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@ -0,0 +1,81 @@
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/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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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, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef EXTFLASH_MDx_H
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#define EXTFLASH_MDx_H
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#include <stdint.h>
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#include <sys/types.h>
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/**
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* Driver for external non volatile memory on MDx family devices, containing
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* both calibration and contact data.
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* For this family non volatile storage hardware is a Winbond W25Q128FV SPI flash
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* connected to SPI1 peripheral.
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*/
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/**
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* Initialise driver for external flash.
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*/
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void extFlash_init();
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/**
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* Terminate driver for external flash.
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*/
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void extFlash_shutdown();
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/**
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* Release flash chip from power down mode, this function should be called at
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* least once after the initialisation of the driver and every time after the
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* chip has been put in low power mode.
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* Application code must wait at least 3us before issuing any other command
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* after this one.
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*/
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void extFlash_wakeup();
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/**
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* Put flash chip in low power mode.
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*/
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void extFlash_sleep();
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/**
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* Read data from one of the flash security registers, located at addresses
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* 0x1000, 0x2000 and 0x3000 and 256-byte wide.
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* NOTE: If a read operation goes beyond the 256 byte boundary, length will be
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* truncated to the one reaching the end of the register.
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*
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* @param addr: start address for read operation, must be the full register address.
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* @param buf: pointer to a buffer where data is written to.
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* @param len: number of bytes to read.
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* @return: -1 if address is not whithin security registers address range, the
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* number of bytes effectively read otherwise.
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*/
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ssize_t extFlash_readSecurityRegister(uint32_t addr, uint8_t *buf, size_t len);
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/**
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* Read data from flash memory.
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*
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* @param addr: start address for read operation.
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* @param buf: pointer to a buffer where data is written to.
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* @param len: number of bytes to read.
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*/
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void extFlash_readData(uint32_t addr, uint8_t *buf, size_t len);
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#endif /* EXTFLASH_MDx_H */
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