h3n3/klipper
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

i2c_software: Implementation of software i2c (#6141)

Browse Source 
Signed-off-by: Alan.Ma from BigTreeTech <tech@biqu3d.com>
This commit is contained in:
BIGTREETECH
2023-06-08 08:55:46 +08:00
committed by GitHub
parent b389c70d5a
commit 645a1b8364
8 changed files with 299 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/Makefile
View File

@@ -9,6 +9,6 @@ src-$(CONFIG_HAVE_GPIO_SDIO) += sdiocmds.c
src-$(CONFIG_HAVE_GPIO_I2C) += i2ccmds.c
src-$(CONFIG_HAVE_GPIO_HARD_PWM) += pwmcmds.c
bb-src-$(CONFIG_HAVE_GPIO_SPI) := spi_software.c sensor_adxl345.c sensor_angle.c
bb-src-$(CONFIG_HAVE_GPIO_I2C) += sensor_mpu9250.c
bb-src-$(CONFIG_HAVE_GPIO_I2C) += i2c_software.c sensor_mpu9250.c
src-$(CONFIG_HAVE_GPIO_BITBANGING) += $(bb-src-y) lcd_st7920.c lcd_hd44780.c \
buttons.c tmcuart.c neopixel.c pulse_counter.c

181
src/i2c_software.c Normal file
View File

@@ -0,0 +1,181 @@
// Software I2C emulation
//
// Copyright (C) 2023 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2023 Alan.Ma <tech@biqu3d.com>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <string.h> // memcpy
#include "board/gpio.h" // gpio_out_setup
#include "board/internal.h" // gpio_peripheral
#include "board/misc.h" // timer_read_time
#include "basecmd.h" // oid_alloc
#include "command.h" // DECL_COMMAND
#include "sched.h" // sched_shutdown
#include "i2ccmds.h" // i2cdev_set_software_bus
struct i2c_software {
struct gpio_out scl_out, sda_out;
struct gpio_in scl_in, sda_in;
uint8_t addr;
unsigned int ticks;
};
void
command_i2c_set_software_bus(uint32_t *args)
{
struct i2cdev_s *i2c = i2cdev_oid_lookup(args[0]);
struct i2c_software *is = alloc_chunk(sizeof(*is));
is->ticks = 1000000 / 100 / 2; // 100KHz
is->addr = (args[4] & 0x7f) << 1; // address format shifted
is->scl_in = gpio_in_setup(args[1], 1);
is->scl_out = gpio_out_setup(args[1], 1);
is->sda_in = gpio_in_setup(args[2], 1);
is->sda_out = gpio_out_setup(args[2], 1);
i2cdev_set_software_bus(i2c, is);
}
DECL_COMMAND(command_i2c_set_software_bus,
"i2c_set_software_bus oid=%c scl_pin=%u sda_pin=%u"
" rate=%u address=%u");
// The AVR micro-controllers require specialized timing
#if CONFIG_MACH_AVR
#define i2c_delay(ticks) (void)(ticks)
#else
static unsigned int
nsecs_to_ticks(uint32_t ns)
{
return timer_from_us(ns * 1000) / 1000000;
}
static void
i2c_delay(unsigned int ticks) {
unsigned int t = timer_read_time() + nsecs_to_ticks(ticks);
while (t > timer_read_time());
}
#endif
static void
i2c_software_send_ack(struct i2c_software *is, const uint8_t ack)
{
if (ack) {
gpio_in_reset(is->sda_in, 1);
} else {
gpio_out_reset(is->sda_out, 0);
}
i2c_delay(is->ticks);
gpio_in_reset(is->scl_in, 1);
i2c_delay(is->ticks);
gpio_out_reset(is->scl_out, 0);
}
static uint8_t
i2c_software_read_ack(struct i2c_software *is)
{
uint8_t nack = 0;
gpio_in_reset(is->sda_in, 1);
i2c_delay(is->ticks);
gpio_in_reset(is->scl_in, 1);
nack = gpio_in_read(is->sda_in);
i2c_delay(is->ticks);
gpio_out_reset(is->scl_out, 0);
gpio_in_reset(is->sda_in, 1);
return nack;
}
static void
i2c_software_send_byte(struct i2c_software *is, uint8_t b)
{
for (uint_fast8_t i = 0; i < 8; i++) {
if (b & 0x80) {
gpio_in_reset(is->sda_in, 1);
} else {
gpio_out_reset(is->sda_out, 0);
}
b <<= 1;
i2c_delay(is->ticks);
gpio_in_reset(is->scl_in, 1);
i2c_delay(is->ticks);
gpio_out_reset(is->scl_out, 0);
}
if (i2c_software_read_ack(is)) {
shutdown("soft_i2c NACK");
}
}
static uint8_t
i2c_software_read_byte(struct i2c_software *is, uint8_t remaining)
{
uint8_t b = 0;
gpio_in_reset(is->sda_in, 1);
for (uint_fast8_t i = 0; i < 8; i++) {
i2c_delay(is->ticks);
gpio_in_reset(is->scl_in, 1);
i2c_delay(is->ticks);
b <<= 1;
b |= gpio_in_read(is->sda_in);
gpio_out_reset(is->scl_out, 0);
}
gpio_in_reset(is->sda_in, 1);
i2c_software_send_ack(is, remaining == 0);
return b;
}
static void
i2c_software_start(struct i2c_software *is, uint8_t addr)
{
i2c_delay(is->ticks);
gpio_in_reset(is->sda_in, 1);
gpio_in_reset(is->scl_in, 1);
i2c_delay(is->ticks);
gpio_out_reset(is->sda_out, 0);
i2c_delay(is->ticks);
gpio_out_reset(is->scl_out, 0);
i2c_software_send_byte(is, addr);
}
static void
i2c_software_stop(struct i2c_software *is)
{
gpio_out_reset(is->sda_out, 0);
i2c_delay(is->ticks);
gpio_in_reset(is->scl_in, 1);
i2c_delay(is->ticks);
gpio_in_reset(is->sda_in, 1);
}
void
i2c_software_write(struct i2c_software *is, uint8_t write_len, uint8_t *write)
{
i2c_software_start(is, is->addr);
while (write_len--)
i2c_software_send_byte(is, *write++);
i2c_software_stop(is);
}
void
i2c_software_read(struct i2c_software *is, uint8_t reg_len, uint8_t *reg
, uint8_t read_len, uint8_t *read)
{
uint8_t addr = is->addr | 0x01;
if (reg_len) {
// write the register
i2c_software_start(is, is->addr);
while(reg_len--)
i2c_software_send_byte(is, *reg++);
}
// start/re-start and read data
i2c_software_start(is, addr);
while(read_len--) {
*read = i2c_software_read_byte(is, read_len);
read++;
}
i2c_software_stop(is);
}

13
src/i2c_software.h Normal file
View File

@@ -0,0 +1,13 @@
#ifndef __I2C_SOFTWARE_H
#define __I2C_SOFTWARE_H
#include <stdint.h> // uint8_t
struct i2c_software *i2c_software_oid_lookup(uint8_t oid);
void i2c_software_write(struct i2c_software *sw_i2c
, uint8_t write_len, uint8_t *write);
void i2c_software_read(struct i2c_software *sw_i2c
, uint8_t reg_len, uint8_t *reg
, uint8_t read_len, uint8_t *read);
#endif // i2c_software.h

55
src/i2ccmds.c
View File

@@ -9,18 +9,20 @@
#include "command.h" //sendf
#include "sched.h" //DECL_COMMAND
#include "board/gpio.h" //i2c_write/read/setup
#include "i2c_software.h" // i2c_software_setup
#include "i2ccmds.h"
enum {
IF_SOFTWARE = 1, IF_HARDWARE = 2
};
void
command_config_i2c(uint32_t *args)
{
uint8_t addr = args[3] & 0x7f;
struct i2cdev_s *i2c = oid_alloc(args[0], command_config_i2c
, sizeof(*i2c));
i2c->i2c_config = i2c_setup(args[1], args[2], addr);
}
DECL_COMMAND(command_config_i2c,
"config_i2c oid=%c i2c_bus=%u rate=%u address=%u");
DECL_COMMAND(command_config_i2c, "config_i2c oid=%c");
struct i2cdev_s *
i2cdev_oid_lookup(uint8_t oid)
@@ -28,6 +30,24 @@ i2cdev_oid_lookup(uint8_t oid)
return oid_lookup(oid, command_config_i2c);
}
void
command_i2c_set_bus(uint32_t *args)
{
uint8_t addr = args[3] & 0x7f;
struct i2cdev_s *i2c = i2cdev_oid_lookup(args[0]);
i2c->i2c_config = i2c_setup(args[1], args[2], addr);
i2c->flags |= IF_HARDWARE;
}
DECL_COMMAND(command_i2c_set_bus,
"i2c_set_bus oid=%c i2c_bus=%u rate=%u address=%u");
void
i2cdev_set_software_bus(struct i2cdev_s *i2c, struct i2c_software *is)
{
i2c->i2c_software = is;
i2c->flags |= IF_SOFTWARE;
}
void
command_i2c_write(uint32_t *args)
{
@@ -35,7 +55,11 @@ command_i2c_write(uint32_t *args)
struct i2cdev_s *i2c = oid_lookup(oid, command_config_i2c);
uint8_t data_len = args[1];
uint8_t *data = command_decode_ptr(args[2]);
i2c_write(i2c->i2c_config, data_len, data);
uint_fast8_t flags = i2c->flags;
if (flags & IF_SOFTWARE)
i2c_software_write(i2c->i2c_software, data_len, data);
else
i2c_write(i2c->i2c_config, data_len, data);
}
DECL_COMMAND(command_i2c_write, "i2c_write oid=%c data=%*s");
@@ -48,7 +72,13 @@ command_i2c_read(uint32_t * args)
uint8_t *reg = command_decode_ptr(args[2]);
uint8_t data_len = args[3];
uint8_t data[data_len];
i2c_read(i2c->i2c_config, reg_len, reg, data_len, data);
uint_fast8_t flags = i2c->flags;
if (flags & IF_SOFTWARE)
i2c_software_read(
i2c->i2c_software, reg_len, reg, data_len, data);
else
i2c_read(
i2c->i2c_config, reg_len, reg, data_len, data);
sendf("i2c_read_response oid=%c response=%*s", oid, data_len, data);
}
DECL_COMMAND(command_i2c_read, "i2c_read oid=%c reg=%*s read_len=%u");
@@ -66,13 +96,22 @@ command_i2c_modify_bits(uint32_t *args)
uint8_t data_len = clear_set_len/2;
uint8_t *clear_set = command_decode_ptr(args[4]);
uint8_t receive_data[reg_len + data_len];
uint_fast8_t flags = i2c->flags;
memcpy(receive_data, reg, reg_len);
i2c_read(i2c->i2c_config, reg_len, reg, data_len, receive_data + reg_len);
if (flags & IF_SOFTWARE)
i2c_software_read(
i2c->i2c_software, reg_len, reg, data_len, receive_data + reg_len);
else
i2c_read(
i2c->i2c_config, reg_len, reg, data_len, receive_data + reg_len);
for (int i = 0; i < data_len; i++) {
receive_data[reg_len + i] &= ~clear_set[i];
receive_data[reg_len + i] |= clear_set[data_len + i];
}
i2c_write(i2c->i2c_config, reg_len + data_len, receive_data);
if (flags & IF_SOFTWARE)
i2c_software_write(i2c->i2c_software, reg_len + data_len, receive_data);
else
i2c_write(i2c->i2c_config, reg_len + data_len, receive_data);
}
DECL_COMMAND(command_i2c_modify_bits,
"i2c_modify_bits oid=%c reg=%*s clear_set_bits=%*s");

3
src/i2ccmds.h
View File

@@ -6,8 +6,11 @@
struct i2cdev_s {
struct i2c_config i2c_config;
struct i2c_software *i2c_software;
uint8_t flags;
};
struct i2cdev_s *i2cdev_oid_lookup(uint8_t oid);
void i2cdev_set_software_bus(struct i2cdev_s *i2c, struct i2c_software *is);
#endif

2
src/stm32/Kconfig
View File

@@ -7,7 +7,7 @@ config STM32_SELECT
default y
select HAVE_GPIO
select HAVE_GPIO_ADC
select HAVE_GPIO_I2C if !(MACH_STM32F031)
select HAVE_GPIO_I2C if !MACH_STM32F031
select HAVE_GPIO_SPI if !MACH_STM32F031
select HAVE_GPIO_SDIO if MACH_STM32F4
select HAVE_GPIO_HARD_PWM if MACH_STM32F1 || MACH_STM32F4 || MACH_STM32F7 || MACH_STM32G0 || MACH_STM32H7