HAL layer SPI, GPIO, address and chip select. More...

#include "user_config.h"
#include "hal.h"
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include "gpio-1284p.h"

Functions
void	gpio_pin_out (uint8_t pin, uint8_t val)
	set GPIO pin state HI or LOW More...

uint8_t	gpio_pin_rd (uint8_t pin)
	read GPIO pin More...

void	chip_select_init (uint8_t pin)
	CHIP select HAL. More...

void	chip_select (uint8_t pin)
	set GPIO to select - LOW More...

void	chip_deselect (uint8_t pin)
	set GPIO to deselect - HI More...

void	chip_addr_init ()
	ADDRESS select HAL. More...

void	chip_addr (int addr __attribute__((unused)))
	set address on GPIO lines More...

void	spi_waitReady ()
	SPI bus wrapper functions for multiple device support. More...

void	spi_init (uint32_t clock, int pin)

void	spi_begin (uint32_t clock, int pin)
	SPI chip enable function Function waits for current tranaction to finish before proceeding. More...

void	spi_end (uint8_t pin)
	SPI chip disable function wait for current tranaction to finish! More...

uint8_t	spi_chip_select_status ()
	SPI CS pin status return CS GPIO pin number or 0xff. More...

void	spi_TX_buffer (const uint8_t *data, int count)
	SPI write buffer. More...

void	spi_RX_buffer (const uint8_t *data, int count)
	SPI read buffer. More...

void	spi_TXRX_buffer (const uint8_t *data, int count)
	SPI write/read buffer. More...

uint8_t	spi_RX ()
	SPI read 1 byte. More...

void	spi_TX (uint8_t data)
	SPI write 1 byte. More...

uint8_t	spi_TXRX (uint8_t data)
	SPI read and write 1 byte. More...

void	set_error (uint8_t error)
	Set error condition. More...

void	clear_error ()
	Set error condition. More...

uint8_t	is_error ()
	is error - test More...

Variables
uint8_t	_cs_pin = 0xff
	SPI init function Function waits for current tranaction to finish before proceeding. More...

uint32_t	_spi_clock = -1L

static uint8_t	error_flag = 0

Detailed Description

HAL layer SPI, GPIO, address and chip select.

Copyright © 2015 Mike Gore, GPL License

You are free to use this code under the terms of GPL: Please retain a copy of this notice in any code you use it in.

This is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file hal.c.

Function Documentation

◆ chip_addr()

void chip_addr ( int addr __attribute__(unused) )

set address on GPIO lines

See also: chip_addr_init

Parameters

[in] addr device address

Returns: void

Definition at line 271 of file hal.c.

◆ chip_addr_init()

void chip_addr_init ( )

ADDRESS select HAL.

initialize GPIO pin as address lines for a device

Returns: void

Definition at line 241 of file hal.c.

◆ chip_deselect()

void chip_deselect ( uint8_t pin )

set GPIO to deselect - HI

Parameters

[in] pin GPIO pin number

Returns: void

Definition at line 225 of file hal.c.

Referenced by spi_end(), and spi_init().

◆ chip_select()

void chip_select ( uint8_t pin )

set GPIO to select - LOW

Parameters

[in] pin GPIO pin number

Returns: void

Definition at line 210 of file hal.c.

Referenced by spi_begin().

◆ chip_select_init()

void chip_select_init ( uint8_t pin )

CHIP select HAL.

initilize GPIO as an active HI chip select

Parameters

[in] pin GPIO pin number

Returns: void

Definition at line 194 of file hal.c.

Referenced by mmc_spi_init().

◆ clear_error()

void clear_error ( )

Set error condition.

Returns: void

Definition at line 513 of file hal.c.

Referenced by main(), and mmc_init().

◆ gpio_pin_out()

void gpio_pin_out	(	uint8_t	pin,
		uint8_t	val
	)

set GPIO pin state HI or LOW

AVR GPIO MACROs.

Parameters

[in]	pin	GPIO pin number
[in]	val	1 for output, 0 for input

Returns: void

Definition at line 150 of file hal.c.

◆ gpio_pin_rd()

uint8_t gpio_pin_rd ( uint8_t pin )

read GPIO pin

Parameters

[in] pin GPIO pin number

Returns: 1 or 0

Definition at line 174 of file hal.c.

◆ is_error()

uint8_t is_error ( )

is error - test

Returns: 0 = ok, !0 = error

Definition at line 521 of file hal.c.

◆ set_error()

void set_error ( uint8_t error )

Set error condition.

Returns: void

Definition at line 505 of file hal.c.

Referenced by mmc_disk_read(), mmc_disk_timerproc(), mmc_init(), and mmc_task().

◆ spi_begin()

void spi_begin	(	uint32_t	clock,
		int	pin
	)

SPI chip enable function Function waits for current tranaction to finish before proceeding.

See also: spi_waitReady; chip_select

Parameters

[in]	clock	SPI clock rate
[in]	pin	GPIO CS pin

Returns: void

initialize pin in case it has not been done yet @ we cache the clock frequency seeting for multiple device support

Definition at line 357 of file hal.c.

Referenced by mmc_spi_begin().

◆ spi_chip_select_status()

uint8_t spi_chip_select_status ( )

SPI CS pin status return CS GPIO pin number or 0xff.

Definition at line 408 of file hal.c.

◆ spi_end()

void spi_end ( uint8_t pin )

SPI chip disable function wait for current tranaction to finish!

See also: spi_waitReady; chip_deselect

Parameters

[in] pin GPIO CS pin

Returns: void

Definition at line 391 of file hal.c.

Referenced by mmc_spi_end().

◆ spi_init()

void spi_init	(	uint32_t	clock,
		int	pin
	)

Definition at line 328 of file hal.c.

Referenced by main(), and spi_begin().

◆ spi_RX()

uint8_t spi_RX ( )

SPI read 1 byte.

Returns: uint8_t value

Definition at line 461 of file hal.c.

◆ spi_RX_buffer()

void spi_RX_buffer	(	const uint8_t *	data,
		int	count
	)

SPI read buffer.

Parameters

[in]	*data	transmit buffer
[in]	count	number of bytes to write

Returns: void

Definition at line 433 of file hal.c.

Referenced by mmc_spi_RX_buffer().

◆ spi_TX()

void spi_TX ( uint8_t data )

SPI write 1 byte.

Parameters

[in] data value to transmit

Returns: void

Definition at line 477 of file hal.c.

Referenced by spi_init().

◆ spi_TX_buffer()

void spi_TX_buffer	(	const uint8_t *	data,
		int	count
	)

SPI write buffer.

Parameters

[in]	*data	transmit buffer
[in]	count	number of bytes to write

Returns: void

Definition at line 418 of file hal.c.

Referenced by mmc_spi_TX_buffer().

◆ spi_TXRX()

uint8_t spi_TXRX ( uint8_t data )

SPI read and write 1 byte.

Parameters

[in] data value to transmit

Returns: uint8_t value read

Definition at line 491 of file hal.c.

Referenced by mmc_spi_TXRX().

◆ spi_TXRX_buffer()

void spi_TXRX_buffer	(	const uint8_t *	data,
		int	count
	)

SPI write/read buffer.

Parameters

[in]	*data	transmit/receive buffer
[in]	count	number of bytes to write

Returns: void

Definition at line 448 of file hal.c.

◆ spi_waitReady()

void spi_waitReady ( )

SPI bus wrapper functions for multiple device support.

Function waits for current SPI tranaction to finish before proceeding

Returns: void

Definition at line 307 of file hal.c.

Referenced by spi_begin(), spi_end(), and spi_init().

Variable Documentation

◆ _cs_pin

uint8_t _cs_pin = 0xff

SPI init function Function waits for current tranaction to finish before proceeding.

See also: spi_waitReady; chip_select

Parameters

[in]	clock	SPI clock rate
[in]	pin	GPIO CS pin

Returns: void

Definition at line 326 of file hal.c.

Referenced by spi_begin(), spi_chip_select_status(), spi_end(), and spi_init().

◆ _spi_clock

uint32_t _spi_clock = -1L

Definition at line 327 of file hal.c.

Referenced by spi_begin(), and spi_init().

◆ error_flag

uint8_t error_flag = 0

static

Definition at line 502 of file hal.c.

Referenced by clear_error(), is_error(), and set_error().

Functions

Variables

Detailed Description

Function Documentation

◆ chip_addr()

◆ chip_addr_init()

◆ chip_deselect()

◆ chip_select()

◆ chip_select_init()

◆ clear_error()

◆ gpio_pin_out()

◆ gpio_pin_rd()

◆ is_error()

◆ set_error()

◆ spi_begin()

◆ spi_chip_select_status()

◆ spi_end()

◆ spi_init()

◆ spi_RX()

◆ spi_RX_buffer()

◆ spi_TX()

◆ spi_TX_buffer()

◆ spi_TXRX()

◆ spi_TXRX_buffer()

◆ spi_waitReady()

Variable Documentation

◆ _cs_pin

◆ _spi_clock

◆ error_flag