A.M. Rowsell
049573ad4b
Making the mqtt as a .a library is a project for a later date. The recipe was broken and so was removed to avoid confusion. Added the Mozilla License header to the new files. Also a few small corrections and additions to the Doxygen documentation. Signed-off-by: A.M. Rowsell <amrowsell@frozenelectronics.ca>
109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdint.h>
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#include "os_type.h"
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#include "osapi.h"
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#include "user_interface.h"
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#include "gpio.h"
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#include "onewire.h"
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#define OWBUS BIT5 /**< This define determines which pin is used */
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sint8 ICACHE_FLASH_ATTR reset(void) {
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uint32_t time;
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// reset the ow line, check for presence?
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time = system_get_time() + 500;
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gpio_output_set(0, OWBUS, OWBUS, 0); // pull GPIO4 low
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while(system_get_time() < time); // delay 500uS
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gpio_output_set(0, 0, 0, OWBUS); // let go of GPIO4
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time = system_get_time() + 60;
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while(system_get_time() < time);
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uint8_t presence = (uint8_t)(gpio_input_get() >> 5) & 0x1;
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// give a 480uS pause so the next onewire event doesn't get trampled
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time = system_get_time() + 480;
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while(system_get_time() < time);
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if(!presence) {
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return 1;
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} else {
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return -1;
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}
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}
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void ICACHE_FLASH_ATTR transact(oneWire_t *owDev, ds18b20_cmds cmd) {
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uint32_t time;
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uint8_t sendBit;
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uint8_t inBit = 0x00;
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uint8_t inByte = 0x00;
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switch(cmd) {
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os_printf("\nOnewire command: %d\n", cmd);
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case SKIP_ROM:
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case CONVERT_T:
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for(uint8_t i = 0; i < 8; i++) {
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sendBit = (cmd >> i) & 0x1;
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//os_printf("\nThe bit is: %d \t i is %d\n", sendBit, i);
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if(sendBit == 1) {
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//os_printf("\nWe are in sendBit == 1\n");
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time = system_get_time() + 10;
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gpio_output_set(0, OWBUS, OWBUS, 0); // pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, OWBUS); // let go
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time = system_get_time() + 50;
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while(system_get_time() < time);
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} else {
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//os_printf("\nWe are in the sendBit else\n");
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time = system_get_time() + 100;
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gpio_output_set(0, OWBUS, OWBUS, 0); //pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, OWBUS); // let go
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time = system_get_time() + 10;
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while(system_get_time() < time);
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}
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}
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break;
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case SCRATCH_READ:
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for(uint8_t i = 0; i < 8; i++) {
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sendBit = (cmd >> i) & 0x1;
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if(sendBit == 1) {
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//os_printf("\nWe are in sendBit == 1\n");
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time = system_get_time() + 10;
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gpio_output_set(0, OWBUS, OWBUS, 0); // pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, OWBUS); // let go
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time = system_get_time() + 50;
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while(system_get_time() < time);
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} else {
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//os_printf("\nWe are in the sendBit else\n");
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time = system_get_time() + 100;
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gpio_output_set(0, OWBUS, OWBUS, 0); //pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, OWBUS); // let go
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time = system_get_time() + 10;
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while(system_get_time() < time);
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}
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}
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// now read the scratchpad
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for(uint8_t i = 0; i < 2; i++) {
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for(uint8_t j = 0; j < 8; j++) {
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time = system_get_time() + 8;
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gpio_output_set(0, OWBUS, OWBUS, 0);
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, OWBUS);
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time = system_get_time() + 15;
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while(system_get_time() < time);
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inBit = (uint8_t)(gpio_input_get() >> 5) & 0x01;
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inByte |= inBit << j;
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time = system_get_time() + 45;
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while(system_get_time() < time);
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}
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owDev->scratchpad[i] = inByte;
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inByte = 0; // clear inByte
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}
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break;
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default:
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os_printf("\nIncorrect command\n");
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break;
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}
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}
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