at25dfx_hal_spi.c File Reference

Connection of the AT25DFx SerialFlash to SPI interface driver.

This file manages the connection of the AT25DFx SerialFlash driver to an SPI service (could be spi master service or usart in spi mode). The SPI service selection depends on AT25DFX_USES_SPI_MASTER_SERVICE or AT25DFX_USES_USART_SPI_SERVICE in conf_at25dfx.h.

Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.

#include "at25dfx_hal_spi.h"
#include "spi_master.h"

Functions to connect the SerialFlash driver with the SPI Multiple-Sector Access Functions.
struct spi_device	AT25DFX_DEVICE1
void	at25dfx_spi_init (void)
	Initialize SPI external resource for AT25DFx SerialFlash driver. More...
void	at25dfx_spi_select_device (uint8_t mem_id)
	Select one external SerialFlash component. More...
void	at25dfx_spi_deselect_device (uint8_t mem_id)
	Deselect one external SerialFlash component. More...
status_code_t	at25dfx_spi_write_byte (uint8_t data)
	Send one byte to the SerialFlash. More...
status_code_t	at25dfx_spi_read_byte (uint8_t *data)
	Get one byte (read) from the SerialFlash. More...
status_code_t	at25dfx_spi_read_packet (void const *data, size_t len)
	Receive a sequence of bytes from a SerialFlash. More...
status_code_t	at25dfx_spi_write_packet (void const *data, size_t len)
	Send a sequence of bytes to a SerialFlash. More...

void at25dfx_spi_deselect_device

(

uint8_t

mem_id

)

Deselect one external SerialFlash component.

Parameters

mem_id

The SerialFlash index number.

References AT25DFX_SPI_MODULE, spi_deselect_device(), and UNUSED.

Referenced by at25dfx_send_command().

void at25dfx_spi_init

(

void

)

Initialize SPI external resource for AT25DFx SerialFlash driver.

This function initializes the SerialFlash component as well as the SPI service that the memory is connected to.

Precondition

The conf_at25dfx.h file should provide the following information:

• Selection of the SPI service the SerialFlash is connected (AT25DFX_USES_SPI_MASTER_SERVICE or AT25DFX_USES_USART_SPI_SERVICE).
• AT25DFX_MEM_SIZE: The SerialFlash type that the driver is connected to.
• AT25DFX_MEM_CNT: The number of SerialFlash components (number of chipselect).
• AT25DFX_SPI_MODULE: The name of the SPI module used by the SerialFlash driver.
• AT25DFX_SPI_MASTER_SPEED: The SPI bus speed.

References AT25DFX_SPI_MASTER_SPEED, AT25DFX_SPI_MODULE, spi_enable(), spi_master_init(), spi_master_setup_device(), and SPI_MODE_0.

Referenced by at25dfx_initialize().

status_code_t at25dfx_spi_read_byte

(

uint8_t *

data

)

Get one byte (read) from the SerialFlash.

Parameters

data	Data buffer to read.

Returns

The received byte.

Precondition

The SerialFlash should be selected first using at25dfx_spi_select_device.

References AT25DFX_SPI_MODULE, and spi_read_packet().

status_code_t at25dfx_spi_read_packet	(	void const *	data,
		size_t	len
	)

Receive a sequence of bytes from a SerialFlash.

Parameters

data	Data buffer to read
len	Length of data

Precondition

The SerialFlash should be selected first using at25dfx_spi_select_device

References AT25DFX_SPI_MODULE, and spi_read_packet().

Referenced by at25dfx_send_command().

void at25dfx_spi_select_device

(

uint8_t

mem_id

)

Select one external SerialFlash component.

Parameters

mem_id

The SerialFlash index number.

References AT25DFX_SPI_MODULE, spi_select_device(), and UNUSED.

Referenced by at25dfx_send_command().

status_code_t at25dfx_spi_write_byte

(

uint8_t

data

)

Send one byte to the SerialFlash.

Parameters

data	The data byte to send.

Precondition

The SerialFlash should be selected first using at25dfx_spi_select_device.

References AT25DFX_SPI_MODULE, and spi_write_packet().

status_code_t at25dfx_spi_write_packet	(	void const *	data,
		size_t	len
	)

Send a sequence of bytes to a SerialFlash.

Parameters

data	Data buffer to write
len	Length of data

Precondition

The SerialFlash should be selected first using at25dfx_spi_select_device

References AT25DFX_SPI_MODULE, and spi_write_packet().

Referenced by at25dfx_send_command().

struct spi_device AT25DFX_DEVICE1

Initial value:

= {
        .id = AT25DFX_CS
    }