DigitalInfinity/ESP32-PaxCounter
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i2c device scan improved

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This commit is contained in:
Klaus K Wilting 2020-10-14 10:29:13 +02:00
parent 0adedc3e35
commit f77fdffba8
3 changed files with 62 additions and 56 deletions
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3
include/i2c.h
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@ -2,6 +2,7 @@
#define _I2C_H #define _I2C_H
#include <Arduino.h> #include <Arduino.h>
#include <BitBang_I2C.h>
#define SSD1306_PRIMARY_ADDRESS (0x3D) #define SSD1306_PRIMARY_ADDRESS (0x3D)
#define SSD1306_SECONDARY_ADDRESS (0x3C) #define SSD1306_SECONDARY_ADDRESS (0x3C)
@ -22,7 +23,7 @@
void i2c_init(void); void i2c_init(void);
void i2c_deinit(void); void i2c_deinit(void);
int i2c_scan(void); void i2c_scan(void);
uint8_t i2c_readBytes(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len); uint8_t i2c_readBytes(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len);
uint8_t i2c_writeBytes(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len); uint8_t i2c_writeBytes(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len);

1
platformio_orig.ini
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@ -62,6 +62,7 @@ lib_deps_lora =
mcci-catena/MCCI LoRaWAN LMIC library @ ^3.2.0 mcci-catena/MCCI LoRaWAN LMIC library @ ^3.2.0
lib_deps_display = lib_deps_display =
bitbank2/OneBitDisplay @ 1.7.2 bitbank2/OneBitDisplay @ 1.7.2
bitbank2/BitBang_I2C @ ^2.1.3
ricmoo/QRCode @ ^0.0.1 ricmoo/QRCode @ ^0.0.1
bodmer/TFT_eSPI @ ^2.2.20 bodmer/TFT_eSPI @ ^2.2.20
lib_deps_ledmatrix = lib_deps_ledmatrix =

114
src/i2c.cpp
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@ -5,7 +5,7 @@
// Local logging tag // Local logging tag
static const char TAG[] = __FILE__; static const char TAG[] = __FILE__;
void i2c_init(void) { Wire.begin(MY_DISPLAY_SDA, MY_DISPLAY_SCL, 400000); } void i2c_init(void) { Wire.begin(MY_DISPLAY_SDA, MY_DISPLAY_SCL, 100000); }
void i2c_deinit(void) { void i2c_deinit(void) {
Wire.~TwoWire(); // shutdown/power off I2C hardware Wire.~TwoWire(); // shutdown/power off I2C hardware
@ -14,73 +14,77 @@ void i2c_deinit(void) {
pinMode(MY_DISPLAY_SCL, INPUT); pinMode(MY_DISPLAY_SCL, INPUT);
} }
int i2c_scan(void) { void i2c_scan(void) {
int i2c_ret, addr; // parts of the code in this function were taken from:
int devices = 0; //
// Copyright (c) 2019 BitBank Software, Inc.
// Written by Larry Bank
// email: bitbank@pobox.com
// Project started 25/02/2019
//
// 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/>.
BBI2C bbi2c;
const char *szNames[] = {
"Unknown", "SSD1306", "SH1106", "VL53L0X", "BMP180", "BMP280",
"BME280", "MPU-60x0", "MPU-9250", "MCP9808", "LSM6DS3", "ADXL345",
"ADS1115", "MAX44009", "MAG3110", "CCS811", "HTS221", "LPS25H",
"LSM9DS1", "LM8330", "DS3231", "LIS3DH", "LIS3DSH", "INA219",
"SHT3X", "HDC1080", "MPU6886", "BME680"};
ESP_LOGI(TAG, "Starting I2C bus scan..."); ESP_LOGI(TAG, "Starting I2C bus scan...");
// block i2c bus access // block i2c bus access
if (I2C_MUTEX_LOCK()) { if (I2C_MUTEX_LOCK()) {
// Scan at 100KHz low speed memset(&bbi2c, 0, sizeof(bbi2c));
Wire.setClock(100000); bbi2c.bWire = 1; // use wire library, no bitbanging
bbi2c.iSDA = MY_DISPLAY_SDA;
bbi2c.iSCL = MY_DISPLAY_SCL;
I2CInit(&bbi2c, 100000L); // Scan at 100KHz low speed
delay(100); // allow devices to power up
for (addr = 8; addr <= 119; addr++) { uint8_t map[16];
uint8_t i;
int iDevice, iCount;
Wire.beginTransmission(addr); I2CScan(&bbi2c, map); // get bitmap of connected I2C devices
Wire.write(addr); if (map[0] == 0xfe) // something is wrong with the I2C bus
i2c_ret = Wire.endTransmission(); {
ESP_LOGI(TAG, "I2C pins are not correct or the bus is being pulled low "
if (i2c_ret == 0) { "by a bad device; unable to run scan");
devices++; } else {
iCount = 0;
switch (addr) { for (i = 1; i < 128; i++) // skip address 0 (general call address) since
// more than 1 device can respond
case SSD1306_PRIMARY_ADDRESS: {
case SSD1306_SECONDARY_ADDRESS: if (map[i >> 3] & (1 << (i & 7))) // device found
ESP_LOGI(TAG, "0x%X: SSD1306 Display controller", addr); {
break; iCount++;
iDevice = I2CDiscoverDevice(&bbi2c, i);
case BME_PRIMARY_ADDRESS: ESP_LOGI(TAG, "Device found at 0x%X, type = %s", i,
case BME_SECONDARY_ADDRESS: szNames[iDevice]); // show the device name as a string
ESP_LOGI(TAG, "0x%X: Bosch BME MEMS", addr); }
break; } // for i
ESP_LOGI(TAG, "%u I2C device(s) found", iCount);
case AXP192_PRIMARY_ADDRESS:
ESP_LOGI(TAG, "0x%X: AXP192 power management", addr);
break;
case IP5306_PRIMARY_ADDRESS:
ESP_LOGI(TAG, "0x%X: IP5306 power management", addr);
break;
case QUECTEL_GPS_PRIMARY_ADDRESS:
ESP_LOGI(TAG, "0x%X: Quectel GPS", addr);
break;
case MCP_24AA02E64_PRIMARY_ADDRESS:
ESP_LOGI(TAG, "0x%X: 24AA02E64 serial EEPROM", addr);
break;
default:
ESP_LOGI(TAG, "0x%X: Unknown device", addr);
break;
} }
} // switch
} // for loop
ESP_LOGI(TAG, "I2C scan done, %u devices found.", devices);
// Set back to 400KHz
Wire.setClock(400000);
I2C_MUTEX_UNLOCK(); // release i2c bus access I2C_MUTEX_UNLOCK(); // release i2c bus access
} else } else
ESP_LOGE(TAG, "I2c bus busy - scan error"); ESP_LOGE(TAG, "I2C bus busy - scan error");
return devices;
} }
// mutexed functions for i2c r/w access // mutexed functions for i2c r/w access