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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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81
src/spi_software.c Normal file
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// 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++;
}
}