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ADDS flash read bytes 🔖
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‎datasheets/winbond-flash.pdf‎

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‎playground/scratch/flash-mem-organization‎

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Basic structure of flash memory
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BYte - smallest adressable unit
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page - 256 bytes basic write unit
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sector - 4KB (16 pages x 246 bytes) basic erase unit
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block - 64KB (16 sectors) larger erase unit
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chip - whole capacity can be erased fully
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THerefore each page is 256 bytes
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Addressing
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The flash memory is byte addressable
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Code will express the address in terms of a page and an offset within that page
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absolute_address = (page_number * page_size) + byte_offset
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To avoid wrapping over on the same page

‎playground/stm32/blackpill-winbond-flash-memory/.mxproject‎

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‎playground/stm32/blackpill-winbond-flash-memory/.settings/language.settings.xml‎

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<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
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<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
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<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
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<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="-1248333385293433819" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
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<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="-1379047546566717012" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
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<language-scope id="org.eclipse.cdt.core.gcc"/>
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<language-scope id="org.eclipse.cdt.core.g++"/>
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</provider>
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<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
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<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
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<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
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<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="-1248333385293433819" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
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<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="-1379047546566717012" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
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<language-scope id="org.eclipse.cdt.core.gcc"/>
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<language-scope id="org.eclipse.cdt.core.g++"/>
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</provider>

‎playground/stm32/blackpill-winbond-flash-memory/Core/Inc/W25Qxx.h‎

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extern SPI_HandleTypeDef hspi3;
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#define READ_DATA_3_BYTE_INSTR (0x03)
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#define READ_DATA_4_BYTE_INSTR (0x13)
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#define FAST_READ_DATA_3_BYTE_INSTR (0x0B)
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#define FAST_READ_DATA_4_BYTE_INSTR (0x0C)
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#define W25Q_SPI hspi3
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#define NUM_BLOCKS (32)
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/**
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* @brief This function creates a short delay
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* @param time length to delay (ms)
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*/
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void external_flash_delay(uint32_t time);
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/**
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* @brief This function pulls the chip select pin LOW
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*/
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void cs_low(void);
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/**
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* @brief This function pulls the chip select pin HIGH
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*/
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void cs_high(void);
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/**
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* @brief This function sends a byte to the flash memory
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* @param data pointer to byte data to write
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* @param len the number of bytes to write
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*/
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void external_flash_spi_write(uint8_t* data, uint8_t len);
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/**
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* @brief This function reads bytes from the flash memory
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* @param data pointer to byte data to read
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* @param len the number of bytes to read
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*/
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void external_flash_spi_read(uint8_t* data, uint8_t len);
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/**
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* @brief This function performs a flash memory reset
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*/
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void external_flash_reset(void);
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/**
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* @brief This function read the flash memory ID
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*/
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uint32_t external_flash_read_ID(void);
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/**
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* @brief This function reads data from a given address
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* @param start_page page number where we want to read from
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* @param offset byte offset within that page (0 - 255)
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* @param the number of bytes we want to read
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* @param buffer pointer to the array where the data will be stored
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*/
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void external_flash_read(uint32_t start_page, uint8_t offset, uint32_t size, uint8_t *buffer);
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/**
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* @brief This function performs a sequential read of bytes from the memory
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*
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*/
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void external_flash_fast_read(uint32_t start_page, uint8_t offset, uint32_t size, uint8_t *buffer);
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void W25Q_Delay(uint32_t time);
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void cs_LOW(void);
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void cs_HIGH(void);
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void SPI_Write(uint8_t* data, uint8_t len);
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void SPI_Read(uint8_t* data, uint8_t len);
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void W25Q_Reset(void);
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uint32_t W25Q_ReadID(void);
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uint8_t external_flash_test();
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#endif /* INC_W25QXX_H_ */

‎playground/stm32/blackpill-winbond-flash-memory/Core/Inc/main.h‎

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/* USER CODE BEGIN Header */
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/**
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******************************************************************************
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* @file : main.h
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* @brief : Header for main.c file.
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* This file contains the common defines of the application.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2025 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* USER CODE END Header */
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/* Define to prevent recursive inclusion -------------------------------------*/
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#ifndef __MAIN_H
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#define __MAIN_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f4xx_hal.h"
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/* Private includes ----------------------------------------------------------*/
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/* USER CODE BEGIN Includes */
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/* USER CODE END Includes */
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/* Exported types ------------------------------------------------------------*/
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/* USER CODE BEGIN ET */
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/* USER CODE END ET */
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/* Exported constants --------------------------------------------------------*/
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/* USER CODE BEGIN EC */
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/* USER CODE END EC */
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/* Exported macro ------------------------------------------------------------*/
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/* USER CODE BEGIN EM */
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/* USER CODE END EM */
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/* Exported functions prototypes ---------------------------------------------*/
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void Error_Handler(void);
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/* USER CODE BEGIN EFP */
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/* USER CODE END EFP */
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/* Private defines -----------------------------------------------------------*/
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#define LED1_Pin GPIO_PIN_13
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#define LED1_GPIO_Port GPIOC
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#define FLASH_CS_Pin GPIO_PIN_14
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#define FLASH_CS_GPIO_Port GPIOB
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/* USER CODE BEGIN Private defines */
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/* USER CODE END Private defines */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __MAIN_H */
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/* USER CODE BEGIN Header */
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/**
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******************************************************************************
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* @file : main.h
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* @brief : Header for main.c file.
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* This file contains the common defines of the application.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2025 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* USER CODE END Header */
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/* Define to prevent recursive inclusion -------------------------------------*/
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#ifndef __MAIN_H
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#define __MAIN_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f4xx_hal.h"
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/* Private includes ----------------------------------------------------------*/
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/* USER CODE BEGIN Includes */
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/* USER CODE END Includes */
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/* Exported types ------------------------------------------------------------*/
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/* USER CODE BEGIN ET */
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/* USER CODE END ET */
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/* Exported constants --------------------------------------------------------*/
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/* USER CODE BEGIN EC */
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/* USER CODE END EC */
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/* Exported macro ------------------------------------------------------------*/
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/* USER CODE BEGIN EM */
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/* USER CODE END EM */
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/* Exported functions prototypes ---------------------------------------------*/
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void Error_Handler(void);
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/* USER CODE BEGIN EFP */
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/* USER CODE END EFP */
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/* Private defines -----------------------------------------------------------*/
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#define LED1_Pin GPIO_PIN_13
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#define LED1_GPIO_Port GPIOC
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#define FLASH_CS_Pin GPIO_PIN_14
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#define FLASH_CS_GPIO_Port GPIOB
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/* USER CODE BEGIN Private defines */
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/* USER CODE END Private defines */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __MAIN_H */

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