add n25q norflash driver

Signed-off-by: liangkangnan <liangkangnan@163.com>

tests/example/include/flash_n25q.h

@@ -0,0 +1,36 @@
+#ifndef _FLASH_N25Q_H_
+#define _FLASH_N25Q_H_
+
+#include <stdint.h>
+
+
+#define N25Q_PAGE_SIZE 	                   256
+
+#define N25Q_PAGE_TO_ADDR(page)           (page << 8)
+#define N25Q_SUBSECTOR_TO_ADDR(subsector) (subsector << 12)
+#define N25Q_SECTOR_TO_ADDR(sector)       (sector << 16)
+
+#define WRITE_STATUS_REG_CMD		0x01
+#define PAGE_PROGRAM_CMD			0x02
+#define READ_CMD 					0x03
+#define WRITE_DISABLE_CMD 			0x04
+#define READ_STATUS_REG_CMD 		0x05
+#define WRITE_ENABLE_CMD 			0x06
+#define SUBSECTOR_ERASE_CMD			0x20
+#define CLEAR_FLAG_STATUS_REG_CMD	0x50
+#define READ_FLAG_STATUS_REG_CMD	0x70
+#define BULK_ERASE_CMD				0xC7
+#define SECTOR_ERASE_CMD			0xD8
+#define WRITE_LOCK_REG_CMD  		0xE5
+#define READ_LOCK_REG_CMD   		0xE8
+#define READ_ID_CMD 				0x9F
+
+
+void n25q_init();
+void n25q_read_id(uint8_t data[], uint8_t len);
+void n25q_read_data(uint8_t data[], uint32_t len, uint32_t addr);
+void n25q_subsector_erase(uint32_t subsector);
+void n25q_sector_erase(uint32_t sector);
+void n25q_page_program(uint8_t data[], uint32_t len, uint32_t page);
+
+#endif

tests/example/lib/flash_n25q.c

@@ -0,0 +1,148 @@
+#include <stdint.h>
+
+#include "../include/flash_n25q.h"
+#include "../include/spi.h"
+#include "../include/xprintf.h"
+
+
+/* N25Q064特点:
+ * 1.总共64Mb大小，即8MB
+ * 2.总共128个扇区，每个扇区大小为64KB
+ * 3.总共2048个子扇区，每个子扇区大小为4KB
+ * 4.总共37768页，每页大小为256B
+ * 5.擦除的最小单位是子扇区，编程(写)的最小单位是页，读的最小单位是字节
+ */
+
+
+// 写使能
+// 擦除或者编程操作之前必须先发送写使能命令
+void n25q_write_enable(uint8_t en)
+{
+    spi_set_ss(0);
+
+    if (en)
+        spi_write_byte(WRITE_ENABLE_CMD);
+    else
+        spi_write_byte(WRITE_DISABLE_CMD);
+
+    spi_set_ss(1);
+}
+
+// 读状态寄存器
+uint8_t n25q_read_status_reg()
+{
+    uint8_t data;
+
+    spi_set_ss(0);
+
+    spi_write_byte(READ_STATUS_REG_CMD);
+    data = spi_read_byte();
+
+    spi_set_ss(1);
+
+    return data;
+}
+
+// 是否正在擦除或者编程
+uint8_t n25q_is_busy()
+{
+    return (n25q_read_status_reg() & 0x1);
+}
+
+void n25q_init()
+{
+    spi_init();
+}
+
+// 读ID号
+void n25q_read_id(uint8_t data[], uint8_t len)
+{
+    spi_set_ss(0);
+
+    spi_write_byte(READ_ID_CMD);
+    spi_read_bytes(data, len);
+
+    spi_set_ss(1);
+}
+
+// 读数据
+// addr: 0, 1, 2, ...
+void n25q_read_data(uint8_t data[], uint32_t len, uint32_t addr)
+{
+    spi_set_ss(0);
+
+    spi_write_byte(READ_CMD);
+    spi_write_byte((addr >> 16) & 0xff);
+    spi_write_byte((addr >> 8) & 0xff);
+    spi_write_byte(addr & 0xff);
+    spi_read_bytes(data, len);
+
+    spi_set_ss(1);
+}
+
+// 子扇区擦除
+// subsector，第几个子扇区: 0 ~ N
+void n25q_subsector_erase(uint32_t subsector)
+{
+    n25q_write_enable(1);
+
+    spi_set_ss(0);
+
+    uint32_t addr = N25Q_SUBSECTOR_TO_ADDR(subsector);
+
+    spi_write_byte(SUBSECTOR_ERASE_CMD);
+    spi_write_byte((addr >> 16) & 0xff);
+    spi_write_byte((addr >> 8) & 0xff);
+    spi_write_byte(addr & 0xff);
+
+    spi_set_ss(1);
+
+    while (n25q_is_busy());
+
+    n25q_write_enable(0);
+}
+
+// 扇区擦除
+// sector，第几个扇区: 0 ~ N
+void n25q_sector_erase(uint32_t sector)
+{
+    n25q_write_enable(1);
+
+    spi_set_ss(0);
+
+    uint32_t addr = N25Q_SECTOR_TO_ADDR(sector);
+
+    spi_write_byte(SECTOR_ERASE_CMD);
+    spi_write_byte((addr >> 16) & 0xff);
+    spi_write_byte((addr >> 8) & 0xff);
+    spi_write_byte(addr & 0xff);
+
+    spi_set_ss(1);
+
+    while (n25q_is_busy());
+
+    n25q_write_enable(0);
+}
+
+// 页编程
+// page，第几页: 0 ~ N
+void n25q_page_program(uint8_t data[], uint32_t len, uint32_t page)
+{
+    n25q_write_enable(1);
+
+    spi_set_ss(0);
+
+    uint32_t addr = N25Q_PAGE_TO_ADDR(page);
+
+    spi_write_byte(PAGE_PROGRAM_CMD);
+    spi_write_byte((addr >> 16) & 0xff);
+    spi_write_byte((addr >> 8) & 0xff);
+    spi_write_byte(addr & 0xff);
+    spi_write_bytes(data, len);
+
+    spi_set_ss(1);
+
+    while (n25q_is_busy());
+
+    n25q_write_enable(0);
+}