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spi_software: Implementation of software spi

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Signed-off-by: Matt Janus <FragginRight@variabl.es>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-02-09 12:22:10 -05:00
parent 090cd930d9
commit 98ed462865
6 changed files with 200 additions and 20 deletions
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2
src/Makefile
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@@ -7,4 +7,4 @@ src-$(CONFIG_HAVE_GPIO_SPI) += spicmds.c thermocouple.c
src-$(CONFIG_HAVE_GPIO_I2C) += i2ccmds.c
src-$(CONFIG_HAVE_GPIO_HARD_PWM) += pwmcmds.c
src-$(CONFIG_HAVE_GPIO_BITBANGING) += lcd_st7920.c lcd_hd44780.c buttons.c \
tmcuart.c
tmcuart.c spi_software.c

81
src/spi_software.c Normal file
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@@ -0,0 +1,81 @@
// Software SPI emulation
//
// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "board/irq.h" // gpio_out_setup
#include "board/gpio.h" // gpio_out_setup
#include "basecmd.h" // oid_alloc
#include "command.h" // DECL_COMMAND
#include "sched.h" // sched_shutdown
struct spi_software {
struct gpio_out sclk, mosi;
struct gpio_in miso;
uint8_t mode;
};
void
command_config_software_spi(uint32_t *args)
{
uint8_t oid = args[0], sclk_pin = args[1], mosi_pin = args[2];
uint8_t miso_pin = args[3], mode = args[4];
if (mode > 3)
shutdown("Invalid spi mode");
struct spi_software *spi = oid_alloc(oid, command_config_software_spi
, sizeof(*spi));
spi->sclk = gpio_out_setup(sclk_pin, 0);
spi->mosi = gpio_out_setup(mosi_pin, 0);
spi->miso = gpio_in_setup(miso_pin, 1);
}
DECL_COMMAND(command_config_software_spi,
"config_software_spi oid=%c sclk_pin=%u mosi_pin=%u miso_pin=%u"
" mode=%u rate=%u");
struct spi_software *
spi_software_oid_lookup(uint8_t oid)
{
return oid_lookup(oid, command_config_software_spi);
}
void
spi_software_prepare(struct spi_software *ss)
{
gpio_out_write(ss->sclk, ss->mode < 2 ? 0 : 1);
}
void
spi_software_transfer(struct spi_software *ss, uint8_t receive_data
, uint8_t len, uint8_t *data)
{
while (len--) {
uint8_t outbuf = *data;
uint8_t inbuf = 0;
for (uint_fast8_t i = 0; i < 8; i++) {
if (ss->mode & 0x01) {
// MODE 1 & 3
gpio_out_toggle(ss->sclk);
gpio_out_write(ss->mosi, outbuf & 0x80);
outbuf <<= 1;
gpio_out_toggle(ss->sclk);
inbuf <<= 1;
inbuf |= gpio_in_read(ss->miso);
} else {
// MODE 0 & 2
gpio_out_write(ss->mosi, outbuf & 0x80);
outbuf <<= 1;
gpio_out_toggle(ss->sclk);
inbuf <<= 1;
inbuf |= gpio_in_read(ss->miso);
gpio_out_toggle(ss->sclk);
}
}
if (receive_data)
*data = inbuf;
data++;
}
}

11
src/spi_software.h Normal file
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@@ -0,0 +1,11 @@
#ifndef __SPI_SOFTWARE_H
#define __SPI_SOFTWARE_H
#include <stdint.h> // uint8_t
struct spi_software *spi_software_oid_lookup(uint8_t oid);
void spi_software_prepare(struct spi_software *ss);
void spi_software_transfer(struct spi_software *ss, uint8_t receive_data
, uint8_t len, uint8_t *data);
#endif // spi_software.h

39
src/spicmds.c
View File

@@ -5,14 +5,19 @@
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <string.h> // memcpy
#include "autoconf.h" // CONFIG_HAVE_GPIO_BITBANGING
#include "board/gpio.h" // gpio_out_write
#include "basecmd.h" // oid_alloc
#include "command.h" // DECL_COMMAND
#include "sched.h" // DECL_SHUTDOWN
#include "spi_software.h" // spi_software_setup
#include "spicmds.h" // spidev_transfer
struct spidev_s {
struct spi_config spi_config;
union {
struct spi_config spi_config;
struct spi_software *spi_software;
};
struct gpio_out pin;
uint8_t flags;
uint8_t shutdown_msg_len;
@@ -20,7 +25,7 @@ struct spidev_s {
};
enum {
SF_HAVE_PIN = 1,
SF_HAVE_PIN = 1, SF_SOFTWARE = 2,
};
void
@@ -58,6 +63,26 @@ DECL_COMMAND(command_config_spi_without_cs,
"config_spi_without_cs oid=%c bus=%u mode=%u rate=%u"
" shutdown_msg=%*s");
void
command_config_spi_from_software(uint32_t *args)
{
uint8_t shutdown_msg_len = args[3];
struct spi_software *sspi = spi_software_oid_lookup(args[1]);
struct spidev_s *spi = oid_alloc(args[0], command_config_spi
, sizeof(*spi) + shutdown_msg_len);
spi->pin = gpio_out_setup(args[2], 1);
spi->flags = SF_HAVE_PIN | SF_SOFTWARE;
spi->spi_software = sspi;
spi->shutdown_msg_len = shutdown_msg_len;
uint8_t *shutdown_msg = (void*)(size_t)args[4];
memcpy(spi->shutdown_msg, shutdown_msg, shutdown_msg_len);
}
#if CONFIG_HAVE_GPIO_BITBANGING
DECL_COMMAND(command_config_spi_from_software,
"config_spi_from_software oid=%c sw_oid=%u pin=%u"
" shutdown_msg=%*s");
#endif
struct spidev_s *
spidev_oid_lookup(uint8_t oid)
{
@@ -68,12 +93,18 @@ void
spidev_transfer(struct spidev_s *spi, uint8_t receive_data
, uint8_t data_len, uint8_t *data)
{
spi_prepare(spi->spi_config);
if (CONFIG_HAVE_GPIO_BITBANGING && spi->flags & SF_SOFTWARE)
spi_software_prepare(spi->spi_software);
else
spi_prepare(spi->spi_config);
if (spi->flags & SF_HAVE_PIN)
gpio_out_write(spi->pin, 0);
spi_transfer(spi->spi_config, receive_data, data_len, data);
if (CONFIG_HAVE_GPIO_BITBANGING && spi->flags & SF_SOFTWARE)
spi_software_transfer(spi->spi_software, receive_data, data_len, data);
else
spi_transfer(spi->spi_config, receive_data, data_len, data);
if (spi->flags & SF_HAVE_PIN)
gpio_out_write(spi->pin, 1);