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gex-core/units/1wire/unit_1wire.c

188 lines
5.0 KiB

//
// Created by MightyPork on 2018/01/29.
//
#include "comm/messages.h"
#include "unit_base.h"
#include "utils/avrlibc.h"
#include "unit_1wire.h"
// 1WIRE master
#define OW_INTERNAL
#include "_ow_internal.h"
// ------------------------------------------------------------------------
/** Load from a binary buffer stored in Flash */
static void U1WIRE_loadBinary(Unit *unit, PayloadParser *pp)
{
struct priv *priv = unit->data;
uint8_t version = pp_u8(pp);
(void)version;
priv->port_name = pp_char(pp);
priv->pin_number = pp_u8(pp);
}
/** Write to a binary buffer for storing in Flash */
static void U1WIRE_writeBinary(Unit *unit, PayloadBuilder *pb)
{
struct priv *priv = unit->data;
pb_u8(pb, 0); // version
pb_char(pb, priv->port_name);
pb_u8(pb, priv->pin_number);
}
// ------------------------------------------------------------------------
/** Parse a key-value pair from the INI file */
static error_t U1WIRE_loadIni(Unit *unit, const char *key, const char *value)
{
bool suc = true;
struct priv *priv = unit->data;
if (streq(key, "pin")) {
suc = parse_pin(value, &priv->port_name, &priv->pin_number);
}
else {
return E_BAD_KEY;
}
if (!suc) return E_BAD_VALUE;
return E_SUCCESS;
}
/** Generate INI file section for the unit */
static void U1WIRE_writeIni(Unit *unit, IniWriter *iw)
{
struct priv *priv = unit->data;
iw_comment(iw, "Data pin");
iw_entry(iw, "pin", "%c%d", priv->port_name, priv->pin_number);
}
// ------------------------------------------------------------------------
/** Allocate data structure and set defaults */
static error_t U1WIRE_preInit(Unit *unit)
{
struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
if (priv == NULL) return E_OUT_OF_MEM;
// some defaults
priv->pin_number = 0;
priv->port_name = 'A';
return E_SUCCESS;
}
/** Finalize unit set-up */
static error_t U1WIRE_init(Unit *unit)
{
bool suc = true;
struct priv *priv = unit->data;
// --- Parse config ---
priv->ll_pin = hw_pin2ll(priv->pin_number, &suc);
priv->port = hw_port2periph(priv->port_name, &suc);
Resource rsc = hw_pin2resource(priv->port_name, priv->pin_number, &suc);
if (!suc) return E_BAD_CONFIG;
// --- Claim resources ---
TRY(rsc_claim(unit, rsc));
// --- Init hardware ---
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinOutputType(priv->port, priv->ll_pin, LL_GPIO_OUTPUT_PUSHPULL);
LL_GPIO_SetPinSpeed(priv->port, priv->ll_pin, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinPull(priv->port, priv->ll_pin, LL_GPIO_PULL_UP); // pull-up for OD state
return E_SUCCESS;
}
/** Tear down the unit */
static void U1WIRE_deInit(Unit *unit)
{
struct priv *priv = unit->data;
// Release all resources
rsc_teardown(unit);
// Free memory
free_ck(unit->data);
}
// ------------------------------------------------------------------------
enum PinCmd_ {
CMD_TEST = 0,
};
/** Handle a request message */
static error_t U1WIRE_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
{
switch (command) {
/** Write byte(s) - addr:u16, byte(s) */
case CMD_TEST:;
bool presence = ow_reset(unit);
if (!presence) return E_HW_TIMEOUT;
ow_write_u8(unit, OW_ROM_SKIP);
ow_write_u8(unit, OW_DS1820_CONVERT_T);
while (!ow_read_bit(unit));
// osDelay(750);
// TODO this will be done with an async timer
// If parasitive power is not used, we could poll and check the status bit
presence = ow_reset(unit);
if (!presence) return E_HW_TIMEOUT;
ow_write_u8(unit, OW_ROM_SKIP);
ow_write_u8(unit, OW_DS1820_READ_SCRATCH);
uint16_t temp = ow_read_u16(unit);
uint16_t threg = ow_read_u16(unit);
uint16_t reserved = ow_read_u16(unit);
uint8_t cnt_remain = ow_read_u8(unit);
uint8_t cnt_per_c = ow_read_u8(unit);
uint8_t crc = ow_read_u8(unit);
// TODO check CRC
PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
pb_u16(&pb, temp);
pb_u8(&pb, cnt_remain);
pb_u8(&pb, cnt_per_c);
dbg("respond ...");
com_respond_buf(frame_id, MSG_SUCCESS, pb.start, pb_length(&pb));
return E_SUCCESS;
default:
return E_UNKNOWN_COMMAND;
}
}
// ------------------------------------------------------------------------
/** Unit template */
const UnitDriver UNIT_1WIRE = {
.name = "1WIRE",
.description = "1-Wire master",
// Settings
.preInit = U1WIRE_preInit,
.cfgLoadBinary = U1WIRE_loadBinary,
.cfgWriteBinary = U1WIRE_writeBinary,
.cfgLoadIni = U1WIRE_loadIni,
.cfgWriteIni = U1WIRE_writeIni,
// Init
.init = U1WIRE_init,
.deInit = U1WIRE_deInit,
// Function
.handleRequest = U1WIRE_handleRequest,
};