ADDS sector erase

Author: bytecod3

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

@@ -14,6 +14,10 @@ extern SPI_HandleTypeDef hspi3;
 #define READ_DATA_4_BYTE_INSTR					(0x13)
 #define FAST_READ_DATA_3_BYTE_INSTR				(0x0B)
 #define FAST_READ_DATA_4_BYTE_INSTR				(0x0C)
+#define ENABLE_WRITE							(0x06)
+#define DISABLE_WRITE							(0x04)
+#define ERASE_SECTOR_3_BYTE_INSTR				(0x20)
+#define ERASE_SECTOR_4_BYTE_INSTR				(0x21)
 
 #define W25Q_SPI	hspi3
 #define NUM_BLOCKS	(32)
@@ -53,6 +57,16 @@ void external_flash_spi_read(uint8_t* data, uint8_t len);
  */
 void external_flash_reset(void);
 
+/**
+ * @brief This function enables writing to the flash memory
+ */
+void external_flash_enable_write(void);
+
+/**
+ * @brief This function disables writing to the flash memory
+ */
+void external_flash_disable_write(void);
+
 /**
  * @brief This function read the flash memory ID
  */
@@ -73,6 +87,11 @@ void external_flash_read(uint32_t start_page, uint8_t offset, uint32_t size, uin
  */
 void external_flash_fast_read(uint32_t start_page, uint8_t offset, uint32_t size, uint8_t *buffer);
 
+/**
+ * @brief This function sets a sector of memory to 0xFF
+ */
+void external_flash_erase_sector(uint16_t num_sector);
+
 
 uint8_t external_flash_test();
 

playground/stm32/blackpill-winbond-flash-memory/Core/Src/W25Qxx.c

@@ -121,3 +121,109 @@ void external_flash_fast_read(uint32_t start_page, uint8_t offset, uint32_t size
 
 	cs_high();
 }
+
+/**
+ * @brief This function enables writing to the flash memory
+ * Write is automatically disabled after power-up
+ */
+void external_flash_enable_write(void) {
+	uint8_t t_data = ENABLE_WRITE;
+	cs_low();
+	external_flash_spi_write(&t_data, 1);
+	cs_high();
+	external_flash_delay(5);
+}
+
+/**
+ * @brief This function disables writing to the flash memory
+ */
+void external_flash_disable_write(void) {
+	uint8_t t_data = DISABLE_WRITE;
+	cs_low();
+	external_flash_spi_write(&t_data, 1);
+	cs_high();
+	external_flash_delay(5);
+}
+
+/**
+ * @brief This function sets a sector of memory to 0xFF
+ */
+void external_flash_erase_sector(uint16_t num_sector) {
+	uint8_t t_data[6];
+	uint32_t mem_addr = num_sector * 16 * 256;
+
+	external_flash_enable_write();
+
+	if (NUM_BLOCKS < 512) {
+		t_data[0] = ERASE_SECTOR_3_BYTE_INSTR;
+		t_data[1] = (mem_addr >> 16) & 0xFF; /* MSB */
+		t_data[2] = (mem_addr >> 8) & 0xFF;
+		t_data[3] = (mem_addr) & 0xFF; /* LSB */
+
+		cs_low();
+		external_flash_spi_write(t_data, 4);
+		cs_low();
+
+	} else {
+		t_data[0] = ERASE_SECTOR_4_BYTE_INSTR;
+		t_data[1] = (mem_addr >> 24) & 0xFF; /* MSB */
+		t_data[2] = (mem_addr >> 16) & 0xFF;
+		t_data[3] = (mem_addr >> 8) & 0xFF;
+		t_data[4] = (mem_addr) & 0xFF; /* LSB */
+
+		cs_low();
+		external_flash_spi_write(t_data, 5);
+		cs_low();
+	}
+
+	external_flash_delay(450); /* sector erase takes ~400ms*/
+
+	external_flash_disable_write();
+
+}
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playground/stm32/blackpill-winbond-flash-memory/Core/Src/main.c

@@ -49,6 +49,10 @@ UART_HandleTypeDef huart1;
 
 /* USER CODE BEGIN PV */
 
+char msg[64];
+uint8_t flash_data[1024]; /* to hold data read from the flash memory */
+
+
 /* USER CODE END PV */
 
 /* Private function prototypes -----------------------------------------------*/
@@ -58,12 +62,40 @@ static void MX_SPI3_Init(void);
 static void MX_USART1_UART_Init(void);
 /* USER CODE BEGIN PFP */
 
+void flash_test_sector_erase();
+void flash_test_sector_read();
+
 /* USER CODE END PFP */
 
 /* Private user code ---------------------------------------------------------*/
 /* USER CODE BEGIN 0 */
 uint32_t flash_id = 0;
 
+void flash_test_sector_read() {
+	/* read 200 bytes from page 20 */
+	external_flash_read(20, 1, 200, flash_data);
+	HAL_UART_Transmit(&huart1, (uint8_t*) "Flash data: \r\n", strlen("Flash data: \r\n"), HAL_MAX_DELAY);
+	HAL_UART_Transmit(&huart1, (uint8_t*) flash_data, strlen(flash_data), HAL_MAX_DELAY);
+
+}
+
+void flash_test_sector_erase() {
+	/* read 20 bytes starting at byte 85 in sector 1 */
+	external_flash_read(1, 85, 20, flash_data);
+	HAL_UART_Transmit(&huart1, (uint8_t*) "Flash data: \r\n", strlen("Flash data: \r\n"), HAL_MAX_DELAY);
+	HAL_UART_Transmit(&huart1, (uint8_t*) flash_data, strlen(flash_data), HAL_MAX_DELAY);
+
+	/* erase sector 1 */
+	external_flash_erase_sector(1);
+
+	/* re-check */
+	external_flash_read(1, 85, 20, flash_data);
+	HAL_UART_Transmit(&huart1, (uint8_t*) "sector data after erase: \r\n", strlen("sector data after erase: \r\n"), HAL_MAX_DELAY);
+	HAL_UART_Transmit(&huart1, (uint8_t*) flash_data, strlen(flash_data), HAL_MAX_DELAY);
+
+
+}
+
 /* USER CODE END 0 */
 
 /**
@@ -100,12 +132,14 @@ int main(void)
   /* USER CODE BEGIN 2 */
 
   /* get the flash memory ID */
-  external_flash_reset();
-  flash_id = external_flash_read_ID();
+  // external_flash_reset();
+  // flash_id = external_flash_read_ID();
+
+  //sprintf(msg, "Flash ID: %02X\r\n", flash_id);
+  // HAL_UART_Transmit(&huart1, (uint8_t*)msg, strlen(msg), 500);
 
-  char msg[64];
-  sprintf(msg, "Flash ID: %02X\r\n", flash_id);
-  HAL_UART_Transmit(&huart1, (uint8_t*)msg, strlen(msg), 500);
+  flash_test_sector_read();
+  //flash_test_sector_erase();
 
   /* USER CODE END 2 */
 

playground/stm32/blackpill-winbond-flash-memory/Debug/Core/Src/W25Qxx.cyclo

@@ -7,3 +7,6 @@
 ../Core/Src/W25Qxx.c:36:10:external_flash_read_ID	1
 ../Core/Src/W25Qxx.c:55:6:external_flash_read	1
 ../Core/Src/W25Qxx.c:90:6:external_flash_fast_read	1
+../Core/Src/W25Qxx.c:129:6:external_flash_enable_write	1
+../Core/Src/W25Qxx.c:140:6:external_flash_disable_write	1
+../Core/Src/W25Qxx.c:151:6:external_flash_erase_sector	1

playground/stm32/blackpill-winbond-flash-memory/Debug/Core/Src/W25Qxx.o

@@ -7,3 +7,6 @@
 ../Core/Src/W25Qxx.c:36:10:external_flash_read_ID	16	static
 ../Core/Src/W25Qxx.c:55:6:external_flash_read	40	static
 ../Core/Src/W25Qxx.c:90:6:external_flash_fast_read	40	static
+../Core/Src/W25Qxx.c:129:6:external_flash_enable_write	16	static
+../Core/Src/W25Qxx.c:140:6:external_flash_disable_write	16	static
+../Core/Src/W25Qxx.c:151:6:external_flash_erase_sector	32	static

playground/stm32/blackpill-winbond-flash-memory/Debug/Core/Src/W25Qxx.su

@@ -1,6 +1,8 @@
-../Core/Src/main.c:73:5:main	1
-../Core/Src/main.c:131:6:SystemClock_Config	3
-../Core/Src/main.c:173:13:MX_SPI3_Init	2
-../Core/Src/main.c:211:13:MX_USART1_UART_Init	2
-../Core/Src/main.c:244:13:MX_GPIO_Init	1
-../Core/Src/main.c:298:6:Error_Handler	1
+../Core/Src/main.c:74:6:flash_test_sector_read	1
+../Core/Src/main.c:82:6:flash_test_sector_erase	1
+../Core/Src/main.c:105:5:main	1
+../Core/Src/main.c:165:6:SystemClock_Config	3
+../Core/Src/main.c:207:13:MX_SPI3_Init	2
+../Core/Src/main.c:245:13:MX_USART1_UART_Init	2
+../Core/Src/main.c:278:13:MX_GPIO_Init	1
+../Core/Src/main.c:332:6:Error_Handler	1

playground/stm32/blackpill-winbond-flash-memory/Debug/Core/Src/main.cyclo

@@ -1,6 +1,8 @@
-../Core/Src/main.c:73:5:main	72	static
-../Core/Src/main.c:131:6:SystemClock_Config	88	static
-../Core/Src/main.c:173:13:MX_SPI3_Init	8	static
-../Core/Src/main.c:211:13:MX_USART1_UART_Init	8	static
-../Core/Src/main.c:244:13:MX_GPIO_Init	48	static
-../Core/Src/main.c:298:6:Error_Handler	4	static,ignoring_inline_asm
+../Core/Src/main.c:74:6:flash_test_sector_read	8	static
+../Core/Src/main.c:82:6:flash_test_sector_erase	8	static
+../Core/Src/main.c:105:5:main	8	static
+../Core/Src/main.c:165:6:SystemClock_Config	88	static
+../Core/Src/main.c:207:13:MX_SPI3_Init	8	static
+../Core/Src/main.c:245:13:MX_USART1_UART_Init	8	static
+../Core/Src/main.c:278:13:MX_GPIO_Init	48	static
+../Core/Src/main.c:332:6:Error_Handler	4	static,ignoring_inline_asm