lpc1788 transplant u-boot-2010.03 spi flash transplant

Development environment:
MCU: NXP LPC1788
u-boot: u-boot-2010.03
SPI Flash: AT45DB321D

Since ATMEL's SPI flash has been implemented in u-boot, we don't need to write the driver for AT45DB321D. Now consider the SPI bus (the SPI driver in u-boot is in the driver/spi directory). In the driver/spi directory, you can see the SPI bus implementation of various chips, but lpc1788 does not have it. Don't move. You will see a soft_spi.c. Now you don't need to write the driver for the SPI bus. Just use soft SPI.

Add the following content to the lpc1788 configuration file:

#define CONFIG_CMD_SF //Add cmd_sf.c file compilation to implement the spi flash operation command sf in u-boot

#define CONFIG_SOFT_SPI //Add driver/spi/soft_spi.c file to compile and implement software spi bus

#define CONFIG_SPI_FLASH //Add driver/mtd/spi/spi_flash.c file to compile

#define CONFIG_SPI_FLASH_ATMEL //Add driver/mtd/spi/atmel.c file to compile and implement AT45 driver

#define CONFIG_SF_DEFAULT_MODE SPI_MODE_1

#define SPI_SCL spi_scl

#define SPI_SDA spi_sda

#define SPI_READ spi_read()

void spi_scl(int);

void spi_sda(int);

unsigned char spi_read(void);

#define SPI_DELAY udelay(2)

Add the following to the board/nxp/lpc1788/board.c file: 

void spi_scl(int bit)

{

struct lpc178x_gpio_dsc dsc;

dsc.port = 2;

dsc.pin = 22;

lpc178x_gpout_set(&dsc, bit);

}

void spi_sda(int bit)

{

struct lpc178x_gpio_dsc dsc;

dsc.port = 2;

dsc.pin = 27;

lpc178x_gpout_set(&dsc, bit);

}

unsigned char spi_read(void)

{

struct lpc178x_gpio_dsc dsc;

dsc.port = 2;

dsc.pin = 26;

return (unsigned char)lpc178x_gpin_get(&dsc);

}

int spi_cs_is_valid(unsigned int bus, unsigned int cs)

{

return bus == 0 && cs == 0;

SPI flash operation commands in u-boot:
1. Select SPI flash
    SF probe 0
2. Erase command
   SF erase 0 0x210 //Note that the erase length must be an integer multiple of 0x210
3. Read command
    SF read addr offset len
​​4. Write command
    SF write addr offset len