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spi_software: respect expected rate

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On fast MCU software spi may violate maximally supported by TMC driver rate.

Add dynamic limits to overcome that.

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
This commit is contained in:
Timofey Titovets 2025-01-26 01:24:00 +01:00 • committed by KevinOConnor
parent 017371b744
commit b826844b34
1 changed files with 32 additions and 5 deletions
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37
src/spi_software.c
View file

@ -4,7 +4,9 @@
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_*
#include "board/gpio.h" // gpio_out_setup
#include "board/misc.h" // timer_read_time
#include "basecmd.h" // oid_alloc
#include "command.h" // DECL_COMMAND
#include "sched.h" // sched_shutdown
@ -13,6 +15,7 @@
struct spi_software {
struct gpio_in miso;
struct gpio_out mosi, sclk;
uint32_t sck_ticks;
uint8_t mode;
};
@ -20,6 +23,8 @@ void
command_spi_set_software_bus(uint32_t *args)
{
uint8_t mode = args[4];
uint32_t rate = args[5];
uint8_t div = 0;
if (mode > 3)
shutdown("Invalid spi config");
@ -29,6 +34,9 @@ command_spi_set_software_bus(uint32_t *args)
ss->mosi = gpio_out_setup(args[2], 0);
ss->sclk = gpio_out_setup(args[3], 0);
ss->mode = mode;
while (((CONFIG_CLOCK_FREQ/2) >> div) > rate)
div++;
ss->sck_ticks = 1 << div;
spidev_set_software_bus(spi, ss);
}
DECL_COMMAND(command_spi_set_software_bus,
@ -41,30 +49,49 @@ spi_software_prepare(struct spi_software *ss)
gpio_out_write(ss->sclk, ss->mode & 0x02);
}
static void
spi_delay(uint32_t end)
{
while (timer_is_before(timer_read_time(), end));
}
void
spi_software_transfer(struct spi_software *ss, uint8_t receive_data
, uint8_t len, uint8_t *data)
{
uint32_t t1 = ss->sck_ticks >> 1;
uint32_t t2 = ss->sck_ticks - t1;
uint32_t end = timer_read_time() + t1;
while (len--) {
uint8_t outbuf = *data;
uint8_t inbuf = 0;
for (uint_fast8_t i = 0; i < 8; i++) {
if (ss->mode & 0x01) {
if (ss->mode & 0x01) {
for (uint_fast8_t i = 0; i < 8; i++) {
spi_delay(end);
// MODE 1 & 3
gpio_out_toggle(ss->sclk);
gpio_out_write(ss->mosi, outbuf & 0x80);
end = timer_read_time() + t2;
outbuf <<= 1;
gpio_out_toggle(ss->sclk);
inbuf <<= 1;
spi_delay(end);
gpio_out_toggle(ss->sclk);
inbuf |= gpio_in_read(ss->miso);
} else {
end = timer_read_time() + t1;
}
} else {
for (uint_fast8_t i = 0; i < 8; i++) {
spi_delay(end);
// MODE 0 & 2
gpio_out_write(ss->mosi, outbuf & 0x80);
outbuf <<= 1;
gpio_out_toggle(ss->sclk);
end = timer_read_time() + t2;
outbuf <<= 1;
inbuf <<= 1;
spi_delay(end);
inbuf |= gpio_in_read(ss->miso);
gpio_out_toggle(ss->sclk);
end = timer_read_time() + t1;
}
}