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gex-core/units/1wire/_ow_api.c

130 lines
3.3 KiB

//
// Created by MightyPork on 2018/02/03.
//
#include "platform.h"
#include "unit_1wire.h"
// 1WIRE master
#define OW_INTERNAL
#include "_ow_internal.h"
#include "_ow_commands.h"
#include "_ow_low_level.h"
/* Check presence of any devices on the bus */
error_t UU_1WIRE_CheckPresence(Unit *unit, bool *presence)
{
CHECK_TYPE(unit, &UNIT_1WIRE);
// reset
*presence = ow_reset(unit);
return E_SUCCESS;
}
/* Read address of a lone device on the bus */
error_t UU_1WIRE_ReadAddress(Unit *unit, uint64_t *address)
{
CHECK_TYPE(unit, &UNIT_1WIRE);
*address = 0;
if (!ow_reset(unit)) return E_HW_TIMEOUT;
// command
ow_write_u8(unit, OW_ROM_READ);
// read the ROM code
*address = ow_read_u64(unit);
const uint8_t *addr_as_bytes = (void*)address;
if (0 != ow_checksum(addr_as_bytes, 8)) {
*address = 0;
return E_CHECKSUM_MISMATCH; // checksum mismatch
}
return E_SUCCESS;
}
/* Write bytes to a device */
error_t UU_1WIRE_Write(Unit *unit, uint64_t address, const uint8_t *buff, uint32_t len)
{
CHECK_TYPE(unit, &UNIT_1WIRE);
if (!ow_reset(unit)) return E_HW_TIMEOUT;
// MATCH_ROM+addr, or SKIP_ROM
if (address != 0) {
ow_write_u8(unit, OW_ROM_MATCH);
ow_write_u64(unit, address);
} else {
ow_write_u8(unit, OW_ROM_SKIP);
}
// write the payload;
for (uint32_t i = 0; i < len; i++) {
ow_write_u8(unit, *buff++);
}
return E_SUCCESS;
}
/* Write a request to a device and read a response */
error_t UU_1WIRE_Read(Unit *unit, uint64_t address,
const uint8_t *request_buff, uint32_t request_len,
uint8_t *response_buff, uint32_t response_len, bool check_crc)
{
CHECK_TYPE(unit, &UNIT_1WIRE);
if (!ow_reset(unit)) return E_HW_TIMEOUT;
uint8_t *rb = response_buff;
// MATCH_ROM+addr, or SKIP_ROM
if (address != 0) {
ow_write_u8(unit, OW_ROM_MATCH);
ow_write_u64(unit, address);
} else {
ow_write_u8(unit, OW_ROM_SKIP);
}
// write the payload;
for (uint32_t i = 0; i < request_len; i++) {
ow_write_u8(unit, *request_buff++);
}
// read the requested number of bytes
for (uint32_t i = 0; i < response_len; i++) {
*rb++ = ow_read_u8(unit);
}
if (check_crc) {
if (0 != ow_checksum(response_buff, response_len)) {
return E_CHECKSUM_MISMATCH;
}
}
return E_SUCCESS;
}
/* Perform the search algorithm (start or continue) */
error_t UU_1WIRE_Search(Unit *unit, bool with_alarm, bool restart,
uint64_t *buffer, uint32_t capacity, uint32_t *real_count,
bool *have_more)
{
CHECK_TYPE(unit, &UNIT_1WIRE);
struct priv *priv = unit->data;
if (restart) {
uint8_t search_cmd = (uint8_t) (with_alarm ? OW_ROM_ALM_SEARCH : OW_ROM_SEARCH);
ow_search_init(unit, search_cmd, true);
}
*real_count = ow_search_run(unit, (ow_romcode_t *) buffer, capacity);
// resolve the code
switch (priv->searchState.status) {
case OW_SEARCH_MORE:
*have_more = priv->searchState.status == OW_SEARCH_MORE;
case OW_SEARCH_DONE:
return E_SUCCESS;
case OW_SEARCH_FAILED:
return priv->searchState.error;
}
return E_INTERNAL_ERROR;
}