A.M. Rowsell
48702bf328
Had to make many changes to get it to compile across many files, including removing the LOCAL specifier from almost all functions. Edited the Makefile to compile all three files and link them. Haven't tested on hardware yet, that's the next step. Lots of small changes to avoid warnings, now that I have turned -Wall on. This makes the code a bit "better". Signed-off-by: A.M. Rowsell <amrowsell@frozenelectronics.ca>
73 lines
2 KiB
C
73 lines
2 KiB
C
#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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sint8 ICACHE_FLASH_ATTR init(oneWire_t *owDev) {
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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, BIT4, BIT4, 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, BIT4); // 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() >> 4) & 0x1;
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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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if((cmd == SKIP_ROM) | (cmd == CONVERT_T)) {
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for(uint8_t i = 7; i >= 0; i--) {
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sendBit = (cmd >> i) & 0x1;
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if(sendBit == 1) {
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time = system_get_time() + 10;
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gpio_output_set(0, BIT4, BIT4, 0); // pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, BIT4); // let go
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} else {
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time = system_get_time() + 100;
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gpio_output_set(0, BIT4, BIT4, 0); //pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, BIT4);
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}
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}
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} else if(cmd == SCRATCH_READ) {
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for(uint8_t i = 7; i >= 0; i--) {
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sendBit = (cmd >> i) & 0x1;
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if(sendBit == 1) {
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time = system_get_time() + 10;
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gpio_output_set(0, BIT4, BIT4, 0); // pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, BIT4); // let go
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} else {
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time = system_get_time() + 100;
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gpio_output_set(0, BIT4, BIT4, 0); //pull low
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, BIT4);
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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, BIT4, BIT4, 0);
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while(system_get_time() < time);
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gpio_output_set(0, 0, 0, BIT4);
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inBit = (uint8_t)(gpio_input_get() >> 4) & 0x01;
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inByte |= inBit << j;
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}
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owDev->scratchpad[i] = inByte;
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}
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}
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}
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