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- //xflash.c
- #include "xflash.h"
- #include <avr/io.h>
- #include <avr/pgmspace.h>
- #include "spi.h"
- #include "fastio.h"
- #ifdef XFLASH
- #define _MFRID_W25X20CL 0xEF
- #define _DEVID_W25X20CL 0x11
- #define _MFRID_GD25Q20C 0xC8
- #define _DEVID_GD25Q20C 0x11
- #define _CMD_ENABLE_WR 0x06
- #define _CMD_ENABLE_WR_VSR 0x50
- #define _CMD_DISABLE_WR 0x04
- #define _CMD_RD_STATUS_REG 0x05
- #define _CMD_WR_STATUS_REG 0x01
- #define _CMD_RD_DATA 0x03
- #define _CMD_RD_FAST 0x0b
- #define _CMD_RD_FAST_D_O 0x3b
- #define _CMD_RD_FAST_D_IO 0xbb
- #define _CMD_PAGE_PROGRAM 0x02
- #define _CMD_SECTOR_ERASE 0x20
- #define _CMD_BLOCK32_ERASE 0x52
- #define _CMD_BLOCK64_ERASE 0xd8
- #define _CMD_CHIP_ERASE 0xc7
- #define _CMD_CHIP_ERASE2 0x60
- #define _CMD_PWR_DOWN 0xb9
- #define _CMD_PWR_DOWN_REL 0xab
- #define _CMD_MFRID_DEVID 0x90
- #define _CMD_MFRID_DEVID_D 0x92
- #define _CMD_JEDEC_ID 0x9f
- #define _CMD_RD_UID 0x4b
- #define _CS_LOW() WRITE(XFLASH_PIN_CS, 0)
- #define _CS_HIGH() WRITE(XFLASH_PIN_CS, 1)
- //#define _SPI_TX swspi_tx
- //#define _SPI_RX swspi_rx
- #define _SPI_TX(b) spi_txrx(b)
- #define _SPI_RX() spi_txrx(0xff)
- int xflash_mfrid_devid(void);
- int8_t xflash_init(void)
- {
- _CS_HIGH();
- SET_OUTPUT(XFLASH_PIN_CS);
- XFLASH_SPI_ENTER();
- if (!xflash_mfrid_devid()) return 0;
- return 1;
- }
- void xflash_enable_wr(void)
- {
- _CS_LOW();
- _SPI_TX(_CMD_ENABLE_WR); // send command 0x06
- _CS_HIGH();
- }
- void xflash_disable_wr(void)
- {
- _CS_LOW();
- _SPI_TX(_CMD_DISABLE_WR); // send command 0x04
- _CS_HIGH();
- }
- uint8_t xflash_rd_status_reg(void)
- {
- _CS_LOW();
- _SPI_TX(_CMD_RD_STATUS_REG); // send command 0x90
- uint8_t val = _SPI_RX(); // receive value
- _CS_HIGH();
- return val;
- }
- #if 0
- void w25x20cl_wr_status_reg(uint8_t val)
- {
- _CS_LOW();
- _SPI_TX(_CMD_WR_STATUS_REG); // send command 0x90
- _SPI_TX(val); // send value
- _CS_HIGH();
- }
- #endif
- static void xflash_send_cmdaddr(uint8_t cmd, uint32_t addr)
- {
- _SPI_TX(cmd); // send command 0x03
- _SPI_TX(((uint8_t*)&addr)[2]); // send addr bits 16..23
- _SPI_TX(((uint8_t*)&addr)[1]); // send addr bits 8..15
- _SPI_TX(((uint8_t*)&addr)[0]); // send addr bits 0..7
- }
- void xflash_rd_data(uint32_t addr, uint8_t* data, uint16_t cnt)
- {
- _CS_LOW();
- xflash_send_cmdaddr(_CMD_RD_DATA, addr);
- while (cnt--) // receive data
- *(data++) = _SPI_RX();
- _CS_HIGH();
- }
- void xflash_page_program(uint32_t addr, uint8_t* data, uint16_t cnt)
- {
- _CS_LOW();
- xflash_send_cmdaddr(_CMD_PAGE_PROGRAM, addr);
- while (cnt--) // send data
- _SPI_TX(*(data++));
- _CS_HIGH();
- }
- void xflash_page_program_P(uint32_t addr, uint8_t* data, uint16_t cnt)
- {
- _CS_LOW();
- xflash_send_cmdaddr(_CMD_PAGE_PROGRAM, addr);
- while (cnt--) // send data
- _SPI_TX(pgm_read_byte(data++));
- _CS_HIGH();
- }
- void xflash_erase(uint8_t cmd, uint32_t addr)
- {
- _CS_LOW();
- xflash_send_cmdaddr(cmd, addr);
- _CS_HIGH();
- }
- void xflash_sector_erase(uint32_t addr)
- {
- return xflash_erase(_CMD_SECTOR_ERASE, addr);
- }
- void xflash_block32_erase(uint32_t addr)
- {
- return xflash_erase(_CMD_BLOCK32_ERASE, addr);
- }
- void xflash_block64_erase(uint32_t addr)
- {
- return xflash_erase(_CMD_BLOCK64_ERASE, addr);
- }
- void xflash_chip_erase(void)
- {
- _CS_LOW();
- _SPI_TX(_CMD_CHIP_ERASE); // send command 0xc7
- _CS_HIGH();
- }
- void xflash_rd_uid(uint8_t* uid)
- {
- _CS_LOW();
- _SPI_TX(_CMD_RD_UID); // send command 0x4b
- uint8_t cnt = 4; // 4 dummy bytes
- while (cnt--) // transmit dummy bytes
- _SPI_TX(0x00);
- cnt = 8; // 8 bytes UID
- while (cnt--) // receive UID
- uid[7 - cnt] = _SPI_RX();
- _CS_HIGH();
- }
- int xflash_mfrid_devid(void)
- {
- _CS_LOW();
- _SPI_TX(_CMD_MFRID_DEVID); // send command 0x90
- uint8_t cnt = 3; // 3 address bytes
- while (cnt--) // send address bytes
- _SPI_TX(0x00);
- uint8_t xflash_mfrid = _SPI_RX(); // receive mfrid
- uint8_t xflash_devid = _SPI_RX(); // receive devid
- _CS_HIGH();
- return
- ((xflash_mfrid == _MFRID_W25X20CL) && (xflash_devid == _DEVID_W25X20CL)) ||
- ((xflash_mfrid == _MFRID_GD25Q20C) && (xflash_devid == _DEVID_GD25Q20C));
- }
- void xflash_wait_busy(void)
- {
- while (xflash_rd_status_reg() & XFLASH_STATUS_BUSY) ;
- }
- #endif //XFLASH
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