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jeremybenn |
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
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* File Name : spi_flash.c
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* Author : MCD Application Team
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* Date First Issued : 02/05/2007
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* Description : This file provides a set of functions needed to manage the
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* communication between SPI peripheral and SPI M25P64 FLASH.
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********************************************************************************
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* History:
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* 04/02/2007: V0.2
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* 02/05/2007: V0.1
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********************************************************************************
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* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
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* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
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* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
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* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
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* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*******************************************************************************/
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/* Includes ------------------------------------------------------------------*/
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#include "spi_flash.h"
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/* Private typedef -----------------------------------------------------------*/
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#define SPI_FLASH_PageSize 256
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#define WRITE 0x02 /* Write to Memory instruction */
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#define WRSR 0x01 /* Write Status Register instruction */
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#define WREN 0x06 /* Write enable instruction */
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#define READ 0x03 /* Read from Memory instruction */
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#define RDSR 0x05 /* Read Status Register instruction */
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#define RDID 0x9F /* Read identification */
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#define SE 0xD8 /* Sector Erase instruction */
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#define BE 0xC7 /* Bulk Erase instruction */
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#define WIP_Flag 0x01 /* Write In Progress (WIP) flag */
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#define Dummy_Byte 0xA5
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/*******************************************************************************
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* Function Name : SPI_FLASH_Init
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* Description : Initializes the peripherals used by the SPI FLASH driver.
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void SPI_FLASH_Init(void)
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{
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SPI_InitTypeDef SPI_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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/* Enable SPI1 and GPIOA clocks */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);
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/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* Configure PA.4 as Output push-pull, used as Flash Chip select */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* Deselect the FLASH: Chip Select high */
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SPI_FLASH_ChipSelect(High);
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/* SPI1 configuration */
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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SPI_InitStructure.SPI_CRCPolynomial = 7;
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SPI_Init(SPI1, &SPI_InitStructure);
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/* Enable SPI1 */
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SPI_Cmd(SPI1, ENABLE);
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}
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/*******************************************************************************
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* Function Name : SPI_FLASH_SectorErase
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* Description : Erases the specified FLASH sector.
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* Input : SectorAddr: address of the sector to erase.
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* Output : None
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* Return : None
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*******************************************************************************/
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void SPI_FLASH_SectorErase(u32 SectorAddr)
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{
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/* Send write enable instruction */
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SPI_FLASH_WriteEnable();
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/* Sector Erase */
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/* Select the FLASH: Chip Select low */
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SPI_FLASH_ChipSelect(Low);
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/* Send Sector Erase instruction */
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SPI_FLASH_SendByte(SE);
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/* Send SectorAddr high nibble address byte */
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SPI_FLASH_SendByte((SectorAddr & 0xFF0000) >> 16);
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/* Send SectorAddr medium nibble address byte */
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SPI_FLASH_SendByte((SectorAddr & 0xFF00) >> 8);
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/* Send SectorAddr low nibble address byte */
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SPI_FLASH_SendByte(SectorAddr & 0xFF);
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/* Deselect the FLASH: Chip Select high */
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SPI_FLASH_ChipSelect(High);
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/* Wait the end of Flash writing */
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SPI_FLASH_WaitForWriteEnd();
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}
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/*******************************************************************************
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* Function Name : SPI_FLASH_BulkErase
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* Description : Erases the entire FLASH.
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void SPI_FLASH_BulkErase(void)
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{
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/* Send write enable instruction */
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SPI_FLASH_WriteEnable();
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/* Bulk Erase */
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/* Select the FLASH: Chip Select low */
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SPI_FLASH_ChipSelect(Low);
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/* Send Bulk Erase instruction */
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SPI_FLASH_SendByte(BE);
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/* Deselect the FLASH: Chip Select high */
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SPI_FLASH_ChipSelect(High);
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/* Wait the end of Flash writing */
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SPI_FLASH_WaitForWriteEnd();
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}
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/*******************************************************************************
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* Function Name : SPI_FLASH_PageWrite
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* Description : Writes more than one byte to the FLASH with a single WRITE
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* cycle(Page WRITE sequence). The number of byte can't exceed
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* the FLASH page size.
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* Input : - pBuffer : pointer to the buffer containing the data to be
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* written to the FLASH.
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* - WriteAddr : FLASH's internal address to write to.
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* - NumByteToWrite : number of bytes to write to the FLASH,
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* must be equal or less than "SPI_FLASH_PageSize" value.
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* Output : None
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* Return : None
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*******************************************************************************/
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void SPI_FLASH_PageWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
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{
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/* Enable the write access to the FLASH */
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SPI_FLASH_WriteEnable();
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/* Select the FLASH: Chip Select low */
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SPI_FLASH_ChipSelect(Low);
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/* Send "Write to Memory " instruction */
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SPI_FLASH_SendByte(WRITE);
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/* Send WriteAddr high nibble address byte to write to */
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SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
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/* Send WriteAddr medium nibble address byte to write to */
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SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8);
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/* Send WriteAddr low nibble address byte to write to */
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SPI_FLASH_SendByte(WriteAddr & 0xFF);
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/* while there is data to be written on the FLASH */
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while(NumByteToWrite--)
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{
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/* Send the current byte */
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SPI_FLASH_SendByte(*pBuffer);
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/* Point on the next byte to be written */
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pBuffer++;
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}
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/* Deselect the FLASH: Chip Select high */
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SPI_FLASH_ChipSelect(High);
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/* Wait the end of Flash writing */
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SPI_FLASH_WaitForWriteEnd();
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}
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/*******************************************************************************
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* Function Name : SPI_FLASH_BufferWrite
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* Description : Writes block of data to the FLASH. In this function, the
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* number of WRITE cycles are reduced, using Page WRITE sequence.
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* Input : - pBuffer : pointer to the buffer containing the data to be
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* written to the FLASH.
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* - WriteAddr : FLASH's internal address to write to.
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* - NumByteToWrite : number of bytes to write to the FLASH.
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* Output : None
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* Return : None
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*******************************************************************************/
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void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
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{
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u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;
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Addr = WriteAddr % SPI_FLASH_PageSize;
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count = SPI_FLASH_PageSize - Addr;
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NumOfPage = NumByteToWrite / SPI_FLASH_PageSize;
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NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;
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if(Addr == 0) /* WriteAddr is SPI_FLASH_PageSize aligned */
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{
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if(NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */
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{
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
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}
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else /* NumByteToWrite > SPI_FLASH_PageSize */
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{
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while(NumOfPage--)
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{
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
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WriteAddr += SPI_FLASH_PageSize;
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pBuffer += SPI_FLASH_PageSize;
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}
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
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}
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}
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else /* WriteAddr is not SPI_FLASH_PageSize aligned */
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{
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if(NumOfPage== 0) /* NumByteToWrite < SPI_FLASH_PageSize */
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{
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if(NumOfSingle > count) /* (NumByteToWrite + WriteAddr) > SPI_FLASH_PageSize */
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{
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temp = NumOfSingle - count;
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);
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WriteAddr += count;
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pBuffer += count;
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, temp);
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}
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else
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{
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
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}
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}
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else /* NumByteToWrite > SPI_FLASH_PageSize */
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{
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NumByteToWrite -= count;
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NumOfPage = NumByteToWrite / SPI_FLASH_PageSize;
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NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);
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WriteAddr += count;
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pBuffer += count;
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while(NumOfPage--)
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{
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
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WriteAddr += SPI_FLASH_PageSize;
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pBuffer += SPI_FLASH_PageSize;
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}
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if(NumOfSingle != 0)
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{
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SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
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}
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}
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}
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}
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/*******************************************************************************
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* Function Name : SPI_FLASH_BufferRead
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* Description : Reads a block of data from the FLASH.
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* Input : - pBuffer : pointer to the buffer that receives the data read
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* from the FLASH.
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* - ReadAddr : FLASH's internal address to read from.
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* - NumByteToRead : number of bytes to read from the FLASH.
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* Output : None
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* Return : None
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*******************************************************************************/
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void SPI_FLASH_BufferRead(u8* pBuffer, u32 ReadAddr, u16 NumByteToRead)
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{
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/* Select the FLASH: Chip Select low */
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SPI_FLASH_ChipSelect(Low);
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/* Send "Read from Memory " instruction */
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SPI_FLASH_SendByte(READ);
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/* Send ReadAddr high nibble address byte to read from */
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SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
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/* Send ReadAddr medium nibble address byte to read from */
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SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
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/* Send ReadAddr low nibble address byte to read from */
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SPI_FLASH_SendByte(ReadAddr & 0xFF);
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while(NumByteToRead--) /* while there is data to be read */
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{
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/* Read a byte from the FLASH */
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*pBuffer = SPI_FLASH_SendByte(Dummy_Byte);
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/* Point to the next location where the byte read will be saved */
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pBuffer++;
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}
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/* Deselect the FLASH: Chip Select high */
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SPI_FLASH_ChipSelect(High);
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}
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/*******************************************************************************
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* Function Name : SPI_FLASH_ReadID
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* Description : Reads FLASH identification.
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* Input : None
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* Output : None
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* Return : FLASH identification
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*******************************************************************************/
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u32 SPI_FLASH_ReadID(void)
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{
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u32 Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;
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/* Select the FLASH: Chip Select low */
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SPI_FLASH_ChipSelect(Low);
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/* Send "RDID " instruction */
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SPI_FLASH_SendByte(0x9F);
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/* Read a byte from the FLASH */
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Temp0 = SPI_FLASH_SendByte(Dummy_Byte);
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/* Read a byte from the FLASH */
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Temp1 = SPI_FLASH_SendByte(Dummy_Byte);
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/* Read a byte from the FLASH */
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Temp2 = SPI_FLASH_SendByte(Dummy_Byte);
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/* Deselect the FLASH: Chip Select high */
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SPI_FLASH_ChipSelect(High);
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Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;
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return Temp;
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}
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/*******************************************************************************
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* Function Name : SPI_FLASH_StartReadSequence
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* Description : Initiates a read data byte (READ) sequence from the Flash.
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* This is done by driving the /CS line low to select the device,
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* then the READ instruction is transmitted followed by 3 bytes
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|
|
* address. This function exit and keep the /CS line low, so the
|
350 |
|
|
* Flash still being selected. With this technique the whole
|
351 |
|
|
* content of the Flash is read with a single READ instruction.
|
352 |
|
|
* Input : - ReadAddr : FLASH's internal address to read from.
|
353 |
|
|
* Output : None
|
354 |
|
|
* Return : None
|
355 |
|
|
*******************************************************************************/
|
356 |
|
|
void SPI_FLASH_StartReadSequence(u32 ReadAddr)
|
357 |
|
|
{
|
358 |
|
|
/* Select the FLASH: Chip Select low */
|
359 |
|
|
SPI_FLASH_ChipSelect(Low);
|
360 |
|
|
|
361 |
|
|
/* Send "Read from Memory " instruction */
|
362 |
|
|
SPI_FLASH_SendByte(READ);
|
363 |
|
|
|
364 |
|
|
/* Send the 24-bit address of the address to read from -----------------------*/
|
365 |
|
|
/* Send ReadAddr high nibble address byte */
|
366 |
|
|
SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
|
367 |
|
|
/* Send ReadAddr medium nibble address byte */
|
368 |
|
|
SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
|
369 |
|
|
/* Send ReadAddr low nibble address byte */
|
370 |
|
|
SPI_FLASH_SendByte(ReadAddr & 0xFF);
|
371 |
|
|
}
|
372 |
|
|
|
373 |
|
|
/*******************************************************************************
|
374 |
|
|
* Function Name : SPI_FLASH_ReadByte
|
375 |
|
|
* Description : Reads a byte from the SPI Flash.
|
376 |
|
|
* This function must be used only if the Start_Read_Sequence
|
377 |
|
|
* function has been previously called.
|
378 |
|
|
* Input : None
|
379 |
|
|
* Output : None
|
380 |
|
|
* Return : Byte Read from the SPI Flash.
|
381 |
|
|
*******************************************************************************/
|
382 |
|
|
u8 SPI_FLASH_ReadByte(void)
|
383 |
|
|
{
|
384 |
|
|
return (SPI_FLASH_SendByte(Dummy_Byte));
|
385 |
|
|
}
|
386 |
|
|
|
387 |
|
|
/*******************************************************************************
|
388 |
|
|
* Function Name : SPI_FLASH_ChipSelect
|
389 |
|
|
* Description : Selects or deselects the FLASH.
|
390 |
|
|
* Input : State : level to be applied on the FLASH's ChipSelect pin.
|
391 |
|
|
* Output : None
|
392 |
|
|
* Return : None
|
393 |
|
|
*******************************************************************************/
|
394 |
|
|
void SPI_FLASH_ChipSelect(u8 State)
|
395 |
|
|
{
|
396 |
|
|
/* Set High or low the chip select line on PA.4 pin */
|
397 |
|
|
GPIO_WriteBit(GPIOA, GPIO_Pin_4, (BitAction)State);
|
398 |
|
|
}
|
399 |
|
|
|
400 |
|
|
/*******************************************************************************
|
401 |
|
|
* Function Name : SPI_FLASH_SendByte
|
402 |
|
|
* Description : Sends a byte through the SPI interface and return the byte
|
403 |
|
|
* received from the SPI bus.
|
404 |
|
|
* Input : byte : byte to send.
|
405 |
|
|
* Output : None
|
406 |
|
|
* Return : The value of the received byte.
|
407 |
|
|
*******************************************************************************/
|
408 |
|
|
u8 SPI_FLASH_SendByte(u8 byte)
|
409 |
|
|
{
|
410 |
|
|
/* Loop while DR register in not emplty */
|
411 |
|
|
while(SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
|
412 |
|
|
|
413 |
|
|
/* Send byte through the SPI1 peripheral */
|
414 |
|
|
SPI_SendData(SPI1, byte);
|
415 |
|
|
|
416 |
|
|
/* Wait to receive a byte */
|
417 |
|
|
while(SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);
|
418 |
|
|
|
419 |
|
|
/* Return the byte read from the SPI bus */
|
420 |
|
|
return SPI_ReceiveData(SPI1);
|
421 |
|
|
}
|
422 |
|
|
|
423 |
|
|
/*******************************************************************************
|
424 |
|
|
* Function Name : SPI_FLASH_SendHalfWord
|
425 |
|
|
* Description : Sends a Half Word through the SPI interface and return the
|
426 |
|
|
* Half Word received from the SPI bus.
|
427 |
|
|
* Input : Half Word : Half Word to send.
|
428 |
|
|
* Output : None
|
429 |
|
|
* Return : The value of the received Half Word.
|
430 |
|
|
*******************************************************************************/
|
431 |
|
|
u16 SPI_FLASH_SendHalfWord(u16 HalfWord)
|
432 |
|
|
{
|
433 |
|
|
/* Loop while DR register in not emplty */
|
434 |
|
|
while(SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
|
435 |
|
|
|
436 |
|
|
/* Send Half Word through the SPI1 peripheral */
|
437 |
|
|
SPI_SendData(SPI1, HalfWord);
|
438 |
|
|
|
439 |
|
|
/* Wait to receive a Half Word */
|
440 |
|
|
while(SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);
|
441 |
|
|
|
442 |
|
|
/* Return the Half Word read from the SPI bus */
|
443 |
|
|
return SPI_ReceiveData(SPI1);
|
444 |
|
|
}
|
445 |
|
|
|
446 |
|
|
/*******************************************************************************
|
447 |
|
|
* Function Name : SPI_FLASH_WriteEnable
|
448 |
|
|
* Description : Enables the write access to the FLASH.
|
449 |
|
|
* Input : None
|
450 |
|
|
* Output : None
|
451 |
|
|
* Return : None
|
452 |
|
|
*******************************************************************************/
|
453 |
|
|
void SPI_FLASH_WriteEnable(void)
|
454 |
|
|
{
|
455 |
|
|
/* Select the FLASH: Chip Select low */
|
456 |
|
|
SPI_FLASH_ChipSelect(Low);
|
457 |
|
|
|
458 |
|
|
/* Send "Write Enable" instruction */
|
459 |
|
|
SPI_FLASH_SendByte(WREN);
|
460 |
|
|
|
461 |
|
|
/* Deselect the FLASH: Chip Select high */
|
462 |
|
|
SPI_FLASH_ChipSelect(High);
|
463 |
|
|
}
|
464 |
|
|
|
465 |
|
|
/*******************************************************************************
|
466 |
|
|
* Function Name : SPI_FLASH_WaitForWriteEnd
|
467 |
|
|
* Description : Polls the status of the Write In Progress (WIP) flag in the
|
468 |
|
|
* FLASH's status register and loop until write opertaion
|
469 |
|
|
* has completed.
|
470 |
|
|
* Input : None
|
471 |
|
|
* Output : None
|
472 |
|
|
* Return : None
|
473 |
|
|
*******************************************************************************/
|
474 |
|
|
void SPI_FLASH_WaitForWriteEnd(void)
|
475 |
|
|
{
|
476 |
|
|
u8 FLASH_Status = 0;
|
477 |
|
|
|
478 |
|
|
/* Select the FLASH: Chip Select low */
|
479 |
|
|
SPI_FLASH_ChipSelect(Low);
|
480 |
|
|
|
481 |
|
|
/* Send "Read Status Register" instruction */
|
482 |
|
|
SPI_FLASH_SendByte(RDSR);
|
483 |
|
|
|
484 |
|
|
/* Loop as long as the memory is busy with a write cycle */
|
485 |
|
|
do
|
486 |
|
|
{
|
487 |
|
|
|
488 |
|
|
/* Send a dummy byte to generate the clock needed by the FLASH
|
489 |
|
|
and put the value of the status register in FLASH_Status variable */
|
490 |
|
|
FLASH_Status = SPI_FLASH_SendByte(Dummy_Byte);
|
491 |
|
|
|
492 |
|
|
} while((FLASH_Status & WIP_Flag) == SET); /* Write in progress */
|
493 |
|
|
|
494 |
|
|
/* Deselect the FLASH: Chip Select high */
|
495 |
|
|
SPI_FLASH_ChipSelect(High);
|
496 |
|
|
}
|
497 |
|
|
|
498 |
|
|
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
|