add I2C, BMP180, MLX90640

2026-03-21 09:00:53 +03:00 · 2022-09-27 20:48:29 +03:00
parent 7ad65ccc2f
commit 97eb3eea21
36 changed files with 2525 additions and 0 deletions
--- a/I2C/I2C.c
+++ b/I2C/I2C.c
@@ -0,0 +1,208 @@
+/*
+ * This file is part of the i2c project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program 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 program 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/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <asm/ioctl.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <usefull_macros.h>
+
+typedef struct{
+    char *device;
+    int slaveaddr;
+    int help;
+    int reg16;
+    int reg8;
+    int data2write;
+    int datalen;
+} glob_pars;
+static glob_pars G = {.device = "/dev/i2c-3", .slaveaddr = 0x33};
+static myoption cmdlnopts[] = {
+    {"help",    NO_ARGS,    NULL,   'h',    arg_int,    APTR(&G.help),      _("show this help")},
+    {"device",  NEED_ARG,   NULL,   'd',    arg_string, APTR(&G.device),    _("I2C device path")},
+    {"slave",   NEED_ARG,   NULL,   'a',    arg_int,    APTR(&G.slaveaddr), _("I2C slave address")},
+    {"reg16",   NEED_ARG,   NULL,   'r',    arg_int,    APTR(&G.reg16),     _("16-bit register address to read/write")},
+    {"reg8",    NEED_ARG,   NULL,   'R',    arg_int,    APTR(&G.reg8),      _("8-bit register address to read/write")},
+    {"data",    NEED_ARG,   NULL,   'D',    arg_int,    APTR(&G.data2write),_("data to write")},
+    {"len",     NEED_ARG,   NULL,   'l',    arg_int,    APTR(&G.datalen),   _("length of data to read")},
+   end_option
+};
+
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+static uint16_t lastaddr = 0;
+
+static int i2c_read_reg8(int fd, uint8_t regaddr, uint8_t *data){
+    struct i2c_smbus_ioctl_data args;
+    union i2c_smbus_data sd;
+    args.read_write = I2C_SMBUS_READ;
+    args.command    = regaddr;
+    args.size       = I2C_SMBUS_BYTE_DATA;
+    args.data       = &sd;
+    if(ioctl(fd, I2C_SMBUS, &args) < 0) return FALSE;
+    *data = sd.byte;
+    return TRUE;
+}
+static int i2c_write_reg8(int fd, uint8_t regaddr, uint8_t data){
+    struct i2c_smbus_ioctl_data args;
+    union i2c_smbus_data sd;
+    sd.byte = data;
+    args.read_write = I2C_SMBUS_WRITE;
+    args.command    = regaddr;
+    args.size       = I2C_SMBUS_BYTE_DATA;
+    args.data       = &sd;
+    if(ioctl(fd, I2C_SMBUS, &args) < 0) return FALSE;
+    return TRUE;
+}
+static int i2c_read_reg(int fd, uint16_t regaddr, uint16_t *data){
+    struct i2c_msg m[2];
+    struct i2c_rdwr_ioctl_data x = {.msgs = m, .nmsgs = 2};
+    m[0].addr = lastaddr; m[1].addr = lastaddr;
+    m[0].flags = 0;
+    m[1].flags = I2C_M_RD;
+    m[0].len = 2; m[1].len = 2;
+    uint8_t a[2], d[2] = {0};
+    a[0] = regaddr >> 8;
+    a[1] = regaddr & 0xff;
+    m[0].buf = a; m[1].buf = d;
+    if(ioctl(fd, I2C_RDWR, &x) < 0) return FALSE;
+    *data = (uint16_t)((d[0] << 8) | (d[1]));
+    return TRUE;
+}
+static int i2c_write_reg(int fd, uint16_t regaddr, uint16_t data){
+    union i2c_smbus_data d;
+    d.block[0] = 3;
+    d.block[1] = regaddr & 0xff;
+    d.block[2] = data >> 8;
+    d.block[3] = data & 0xff;
+    struct i2c_smbus_ioctl_data args;
+    args.read_write = I2C_SMBUS_WRITE;
+    args.command    = regaddr >> 8;
+    args.size       = I2C_SMBUS_I2C_BLOCK_DATA;
+    args.data       = &d;
+    if(ioctl(fd, I2C_SMBUS, &args) < 0) return FALSE;
+    printf("Block: ");
+    for(int i = 0; i < 4; ++i) printf("0x%02x ", d.block[i]);
+    printf("\n");
+    return TRUE;
+}
+
+
+static inline int i2c_set_slave_address(int fd, uint8_t addr){
+    if(ioctl (fd, I2C_SLAVE, addr) < 0) return FALSE;
+    lastaddr = addr;
+    return TRUE;
+}
+
+static inline int i2c_open(const char *path){
+    return open(path, O_RDWR);
+}
+
+int main(int argc, char **argv){
+    uint16_t d;
+    uint8_t d8;
+    initial_setup();
+    parseargs(&argc, &argv, cmdlnopts);
+    if(G.help) showhelp(-1, cmdlnopts);
+    if(G.slaveaddr < 0 || G.slaveaddr > 0x7f) ERRX("I2C address should be 7-bit");
+    if(G.reg16 && G.reg8) ERRX("Enter either 8-bit address or 16-bit");
+    int fd = i2c_open(G.device);
+    if(fd < 0) ERR("Can't open %s", G.device);
+    if(G.datalen){
+        if(G.datalen < 0) ERRX("data length is uint16_t");
+        if(G.datalen + G.reg16 > 0xffff) ERRX("Data len + start reg should be uint16_t");
+    }
+    if(!i2c_set_slave_address(fd, (uint8_t)G.slaveaddr)){
+        WARN("Can't set slave address 0x%02x", G.slaveaddr);
+        goto clo;
+    }
+    if(!i2c_read_reg8(fd, (uint16_t)0, &d8)){
+        WARN("Can't find slave 0x%02x", G.slaveaddr);
+        goto clo;
+    }
+    green("Connected to slave 0x%02x\n", G.slaveaddr);
+    if(!G.reg8 && !G.reg16) goto clo; // nothing to do
+    if(G.data2write){ // write data to register
+        if(G.reg8){
+            if(G.data2write < 0 || G.data2write > 0xff){
+                WARNX("Data to write should be uint8_t");
+                goto clo;
+            }
+            printf("Try to write 0x%02x to 0x%02x ... ", G.data2write, G.reg8);
+            if(!i2c_write_reg8(fd, (uint8_t)G.reg16, (uint8_t)G.data2write)){
+                WARN("Can't write"); goto clo;
+            }
+            else printf("OK\n");
+        }else{
+            if(G.data2write < 0 || G.data2write > 0xffff){
+                WARNX("Data to write should be uint16_t");
+                goto clo;
+            }
+            printf("Try to write 0x%04x to 0x%04x ... ", G.data2write, G.reg16);
+            if(!i2c_write_reg(fd, (uint16_t)G.reg16, (uint16_t)G.data2write)){
+                WARN("Can't write"); goto clo;
+            }
+            else printf("OK\n");
+        }
+    }
+    if(!G.datalen){
+        if(G.reg8){
+            if(!i2c_read_reg8(fd, (uint8_t)G.reg8, &d8)){
+                WARN("Can't read"); goto clo;
+            }
+            printf("Read: 0x%02x\n", d8);
+        }else{
+            if(!i2c_read_reg(fd, (uint16_t)G.reg16, &d)){
+                WARN("Can't read"); goto clo;
+            }
+            printf("Read: 0x%04x\n", d);
+        }
+    }else{
+        int reg = (G.reg8) ? G.reg8 : G.reg16;
+        int lastreg = G.datalen + reg;
+        for(int i = reg; i < lastreg; ++i){
+            if(G.reg8){
+                if(!i2c_read_reg8(fd, (uint8_t)i, &d8)){
+                    WARN("Can't read"); continue;
+                }
+                printf("%2d: 0x%02x -> 0x%02x\n", i-reg, i, d8);
+            }else{
+                if(!i2c_read_reg(fd, (uint16_t)i, &d)){
+                    WARN("Can't read"); continue;
+                }
+                printf("%4d: 0x%04x -> 0x%04x\n", i-G.reg16, i, d);
+            }
+        }
+    }
+clo:
+    close(fd);
+    return 0;
+}
+
--- a/I2C/Makefile
+++ b/I2C/Makefile
@@ -0,0 +1,57 @@
+# run `make DEF=...` to add extra defines
+PROGRAM := i2c
+LDFLAGS := -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--discard-all
+LDFLAGS += -lusefull_macros
+SRCS := $(wildcard *.c)
+DEFINES := $(DEF) -D_GNU_SOURCE -D_XOPEN_SOURCE=1111
+OBJDIR := mk
+CFLAGS += -O2 -Wall -Wextra -Wno-trampolines -std=gnu99
+OBJS := $(addprefix $(OBJDIR)/, $(SRCS:%.c=%.o))
+DEPS := $(OBJS:.o=.d)
+TARGFILE := $(OBJDIR)/TARGET
+CC = gcc
+#TARGET := RELEASE
+
+ifeq ($(shell test -e $(TARGFILE) && echo -n yes),yes)
+	TARGET := $(file < $(TARGFILE))
+else
+	TARGET := RELEASE
+endif
+
+ifeq ($(TARGET), DEBUG)
+	.DEFAULT_GOAL := debug
+endif
+
+release: $(PROGRAM)
+
+debug: CFLAGS += -DEBUG -Werror
+debug: TARGET := DEBUG
+debug: $(PROGRAM)
+
+$(TARGFILE): $(OBJDIR)
+	@echo -e "\t\tTARGET: $(TARGET)"
+	@echo "$(TARGET)" > $(TARGFILE)
+
+$(PROGRAM) : $(TARGFILE) $(OBJS)
+	@echo -e "\t\tLD $(PROGRAM)"
+	$(CC)  $(OBJS) $(LDFLAGS) -o $(PROGRAM)
+
+$(OBJDIR):
+	@mkdir $(OBJDIR)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR)/%.o: %.c
+	@echo -e "\t\tCC $<"
+	$(CC) $< -MD -c $(LDFLAGS) $(CFLAGS) $(DEFINES) -o $@ 
+
+clean:
+	@echo -e "\t\tCLEAN"
+	@rm -rf $(OBJDIR) 2>/dev/null || true
+
+xclean: clean
+	@rm -f $(PROGRAM)
+
+.PHONY: clean xclean
--- a/I2C/i2c.cflags
+++ b/I2C/i2c.cflags
@@ -0,0 +1 @@
+-std=c17
--- a/I2C/i2c.config
+++ b/I2C/i2c.config
@@ -0,0 +1,2 @@
+// Add predefined macros for your project here. For example:
+// #define THE_ANSWER 42
--- a/I2C/i2c.creator
+++ b/I2C/i2c.creator
@@ -0,0 +1 @@
+[General]
--- a/I2C/i2c.creator.user
+++ b/I2C/i2c.creator.user
@@ -0,0 +1,174 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE QtCreatorProject>
+<!-- Written by QtCreator 6.0.0, 2022-09-24T20:49:03. -->
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--- a/I2C/i2c.cxxflags
+++ b/I2C/i2c.cxxflags
@@ -0,0 +1 @@
+-std=c++17
--- a/I2C/i2c.files
+++ b/I2C/i2c.files
@@ -0,0 +1 @@
+I2C.c
--- a/I2C/i2c.includes
+++ b/I2C/i2c.includes