From 86392aa607cd5f2e55f86d711c00140fb511e42d Mon Sep 17 00:00:00 2001 From: liangkangnan Date: Tue, 5 May 2020 18:33:50 +0800 Subject: [PATCH] add n25q norflash driver Signed-off-by: liangkangnan --- tests/example/include/flash_n25q.h | 36 +++++++ tests/example/lib/flash_n25q.c | 148 +++++++++++++++++++++++++++++ 2 files changed, 184 insertions(+) create mode 100644 tests/example/include/flash_n25q.h create mode 100644 tests/example/lib/flash_n25q.c diff --git a/tests/example/include/flash_n25q.h b/tests/example/include/flash_n25q.h new file mode 100644 index 0000000..99f782e --- /dev/null +++ b/tests/example/include/flash_n25q.h @@ -0,0 +1,36 @@ +#ifndef _FLASH_N25Q_H_ +#define _FLASH_N25Q_H_ + +#include + + +#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 diff --git a/tests/example/lib/flash_n25q.c b/tests/example/lib/flash_n25q.c new file mode 100644 index 0000000..3bb657c --- /dev/null +++ b/tests/example/lib/flash_n25q.c @@ -0,0 +1,148 @@ +#include + +#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); +}