diff --git a/app/include/user_modules.h b/app/include/user_modules.h index 27c4d4c1..a250e060 100644 --- a/app/include/user_modules.h +++ b/app/include/user_modules.h @@ -14,6 +14,7 @@ #ifndef LUA_CROSS_COMPILER #define LUA_USE_MODULES_ADC +//#define LUA_USE_MODULES_AM2320 //#define LUA_USE_MODULES_APA102 #define LUA_USE_MODULES_BIT //#define LUA_USE_MODULES_BMP085 diff --git a/app/modules/am2320.c b/app/modules/am2320.c new file mode 100644 index 00000000..a0d94608 --- /dev/null +++ b/app/modules/am2320.c @@ -0,0 +1,153 @@ +/* + * app/modules/am2320.c + * + * Copyright (c) 2016 Henk Vergonet + * + * 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 2 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include "module.h" +#include "lauxlib.h" +#include "platform.h" +#include "lwip/udp.h" +#include + +static const uint32_t am2320_i2c_id = 0; +static const uint8_t am2320_i2c_addr = 0xb8 >> 1; + +static uint16_t crc16(uint8_t *ptr, unsigned int len) +{ + uint16_t crc =0xFFFF; + uint8_t i; + + while(len--) { + crc ^= *ptr++; + for(i=0;i<8;i++) { + if(crc & 0x01) { + crc >>= 1; + crc ^= 0xA001; + } else { + crc >>= 1; + } + } + } + return crc; +} + +/* make sure buf has lenght len+2 in order to accommodate for extra bytes */ +static int _read(uint32_t id, void *buf, uint8_t len, uint8_t off) +{ + int i; + uint8_t *b = (uint8_t *)buf; + uint16_t crc; + + // step 1: Wake sensor + platform_i2c_send_start(id); + platform_i2c_send_address(id, am2320_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER); + os_delay_us(800); + platform_i2c_send_stop(id); + + // step 2: Send read command + platform_i2c_send_start(id); + platform_i2c_send_address(id, am2320_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER); + platform_i2c_send_byte(id, 0x03); + platform_i2c_send_byte(id, off); + platform_i2c_send_byte(id, len); + platform_i2c_send_stop(id); + + // step 3: Read the data + os_delay_us(1500); + platform_i2c_send_start(id); + platform_i2c_send_address(id, am2320_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER); + os_delay_us(30); + for(i=0; i