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