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MightyPork
2017-12-15 23:52:14 +01:00
commit 56a935cdd0
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units/pin/unit_pin.c
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//
// Created by MightyPork on 2017/11/25.
//
#include "comm/messages.h"
#include "unit_base.h"
#include "unit_pin.h"
/** Private data structure */
struct priv {
char port_name;
uint8_t pin_number;
bool output;
bool pull_up;
bool open_drain;
uint32_t ll_pin;
GPIO_TypeDef *port;
};
// ------------------------------------------------------------------------
/** Load from a binary buffer stored in Flash */
static void Pin_loadBinary(Unit *unit, PayloadParser *pp)
{
struct priv *priv = unit->data;
priv->port_name = pp_char(pp);
priv->pin_number = pp_u8(pp);
priv->output = pp_bool(pp);
priv->pull_up = pp_bool(pp);
priv->open_drain = pp_bool(pp);
}
/** Write to a binary buffer for storing in Flash */
static void Pin_writeBinary(Unit *unit, PayloadBuilder *pb)
{
struct priv *priv = unit->data;
pb_char(pb, priv->port_name);
pb_u8(pb, priv->pin_number);
pb_bool(pb, priv->output);
pb_bool(pb, priv->pull_up);
pb_bool(pb, priv->open_drain);
}
// ------------------------------------------------------------------------
/** Parse a key-value pair from the INI file */
static bool Pin_loadIni(Unit *unit, const char *key, const char *value)
{
bool suc = true;
struct priv *priv = unit->data;
if (streq(key, "pin")) {
suc = str_parse_pin(value, &priv->port_name, &priv->pin_number);
}
else if (streq(key, "dir")) {
priv->output = str_parse_01(value, "IN", "OUT", &suc);
}
else if (streq(key, "pull")) {
priv->pull_up = str_parse_01(value, "DOWN", "UP", &suc);
}
else if (streq(key, "opendrain")) {
priv->open_drain = str_parse_yn(value, &suc);
} else {
return false;
}
return suc;
}
/** Generate INI file section for the unit */
static void Pin_writeIni(Unit *unit, IniWriter *iw)
{
struct priv *priv = unit->data;
iw_comment(iw, "Physical pin");
iw_entry(iw, "pin", "%c%d", priv->port_name, priv->pin_number);
iw_comment(iw, "Direction (IN, OUT)");
iw_entry(iw, "dir", "%s", str_01(priv->output, "IN", "OUT"));
iw_comment(iw, "Pull resistor, only for input (UP, DOWN)");
iw_entry(iw, "pull", "%s", str_01(priv->pull_up, "DOWN", "UP"));
iw_comment(iw, "Open drain, only for output (Y, N)");
iw_entry(iw, "opendrain", "%s", str_yn(priv->open_drain));
}
// ------------------------------------------------------------------------
/** Allocate data structure and set defaults */
static bool Pin_preInit(Unit *unit)
{
bool suc = true;
struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv), &suc);
CHECK_SUC();
// some defaults
priv->pin_number = 0;
priv->port_name = 'A';
priv->output = true;
priv->open_drain = false;
priv->pull_up = false;
return true;
}
/** Finalize unit set-up */
static bool Pin_init(Unit *unit)
{
bool suc = true;
struct priv *priv = unit->data;
// --- Parse config ---
priv->ll_pin = plat_pin2ll(priv->pin_number, &suc);
priv->port = plat_port2periph(priv->port_name, &suc);
Resource rsc = plat_pin2resource(priv->port_name, priv->pin_number, &suc);
if (!suc) {
unit->status = E_BAD_CONFIG;
return false;
}
// --- Claim resources ---
if (!rsc_claim(unit, rsc)) return false;
// --- Init hardware ---
LL_GPIO_SetPinMode(priv->port, priv->ll_pin,
priv->output ? LL_GPIO_MODE_OUTPUT : LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinOutputType(priv->port, priv->ll_pin,
priv->open_drain ? LL_GPIO_OUTPUT_OPENDRAIN : LL_GPIO_OUTPUT_PUSHPULL);
LL_GPIO_SetPinPull(priv->port, priv->ll_pin,
priv->pull_up ? LL_GPIO_PULL_UP : LL_GPIO_PULL_DOWN);
LL_GPIO_SetPinSpeed(priv->port, priv->ll_pin,
LL_GPIO_SPEED_FREQ_HIGH);
return true;
}
/** Tear down the unit */
static void Pin_deInit(Unit *unit)
{
struct priv *priv = unit->data;
// configure the pin as analog
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_ANALOG);
// Release all resources
rsc_teardown(unit);
// Free memory
free(unit->data);
unit->data = NULL;
}
// ------------------------------------------------------------------------
enum PinCmd_ {
CMD_CLEAR = 0,
CMD_SET = 1,
CMD_TOGGLE = 2,
CMD_READ = 3,
};
/** Handle a request message */
static bool Pin_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
{
(void)pp;
struct priv *priv = unit->data;
switch (command) {
case CMD_CLEAR:
if (priv->output) {
LL_GPIO_ResetOutputPin(priv->port, priv->ll_pin);
} else goto must_be_output;
break;
case CMD_SET:
if (priv->output) {
LL_GPIO_SetOutputPin(priv->port, priv->ll_pin);
} else goto must_be_output;
break;
case CMD_TOGGLE:
if (priv->output) {
LL_GPIO_TogglePin(priv->port, priv->ll_pin);
} else goto must_be_output;
break;
case CMD_READ:
if (!priv->output) {
sched_respond_u8(frame_id, (bool) LL_GPIO_IsInputPinSet(priv->port, priv->ll_pin));
} else goto must_be_input;
break;
default:
sched_respond_bad_cmd(frame_id);
return false;
}
return true;
must_be_output:
sched_respond_err(frame_id, "NOT OUTPUT PIN");
return false;
must_be_input:
sched_respond_err(frame_id, "NOT INPUT PIN");
return false;
}
// ------------------------------------------------------------------------
/** Unit template */
const UnitDriver UNIT_PIN = {
.name = "PIN",
.description = "Single digital I/O pin",
// Settings
.preInit = Pin_preInit,
.cfgLoadBinary = Pin_loadBinary,
.cfgWriteBinary = Pin_writeBinary,
.cfgLoadIni = Pin_loadIni,
.cfgWriteIni = Pin_writeIni,
// Init
.init = Pin_init,
.deInit = Pin_deInit,
// Function
.handleRequest = Pin_handleRequest,
};
units/pin/unit_pin.h
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//
// Created by MightyPork on 2017/11/25.
//
#ifndef U_PIN_H
#define U_PIN_H
#include "unit.h"
extern const UnitDriver UNIT_PIN;
#endif //U_PIN_H