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onewire basic impl + fixed a bug in usec delays

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sipo
Ondřej Hruška 6 years ago
parent 9e65c8409a
commit eca8319820
Signed by: MightyPork
GPG Key ID: 2C5FD5035250423D
5 changed files with 318 additions and 216 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 17
      platform/timebase.c
  2. 25
      units/1wire/_ow_commands.h
  3. 80
      units/1wire/_ow_internal.h
  4. 193
      units/1wire/_ow_ll.c
  5. 219
      units/1wire/unit_1wire.c

17
platform/timebase.c
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@ -95,17 +95,24 @@ uint64_t PTIM_GetMicrotime(void)
}
vPortExitCritical();
return (uint64_t)uwMillis*1000 + uwMicros;
return (uint64_t) uwMillis * 1000 + uwMicros;
}
/** microsecond delay */
void PTIM_MicroDelay(uint16_t usec)
{
usec++; // rounding up
assert_param(usec < 1000);
uint16_t end = (uint16_t) (TIMEBASE_TIMER->CNT + usec);
if (end > 999) end -= 1000;
const uint16_t start = (uint16_t) TIMEBASE_TIMER->CNT;
const uint16_t remain = (uint16_t) (999 - start);
while (TIMEBASE_TIMER->CNT != end);
if (remain > usec) {
// timer still has enough space going forward to pass the required wait time
for (; TIMEBASE_TIMER->CNT < start + usec;);
}
else {
// timer is too close to the end
usec -= remain;
for (; TIMEBASE_TIMER->CNT >= start || TIMEBASE_TIMER->CNT < usec;);
}
}

25
units/1wire/_ow_commands.h
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@ -0,0 +1,25 @@
//
// Created by MightyPork on 2018/01/29.
//
#ifndef GEX_F072_OW_COMMANDS_H
#define GEX_F072_OW_COMMANDS_H
#ifndef OW_INTERNAL
#error bad include!
#endif
#define OW_ROM_SEARCH 0xF0
#define OW_ROM_READ 0x33
#define OW_ROM_MATCH 0x55
#define OW_ROM_SKIP 0xCC
#define OW_ROM_ALM_SEARCH 0xEC
#define OW_DS1820_CONVERT_T 0x44
#define OW_DS1820_WRITE_SCRATCH 0x4E
#define OW_DS1820_READ_SCRATCH 0xBE
#define OW_DS1820_COPY_SCRATCH 0x48
#define OW_DS1820_RECALL_E2 0xB8
#define OW_DS1820_READ_SUPPLY 0xB4
#endif //GEX_F072_OW_COMMANDS_H

80
units/1wire/_ow_internal.h
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@ -0,0 +1,80 @@
//
// Created by MightyPork on 2018/01/29.
//
#ifndef GEX_F072_OW_INTERNAL_H
#define GEX_F072_OW_INTERNAL_H
#ifndef OW_INTERNAL
#error bad include!
#endif
#include "_ow_commands.h"
/** Private data structure */
struct priv {
char port_name;
uint8_t pin_number;
GPIO_TypeDef *port;
uint32_t ll_pin;
};
// Prototypes
/**
* Reset the 1-wire bus
*/
bool ow_reset(Unit *unit);
/**
* Write a bit to the 1-wire bus
*/
void ow_write_bit(Unit *unit, bool bit);
/**
* Read a bit from the 1-wire bus
*/
bool ow_read_bit(Unit *unit);
/**
* Write a byte to the 1-wire bus
*/
void ow_write_u8(Unit *unit, uint8_t byte);
/**
* Write a halfword to the 1-wire bus
*/
void ow_write_u16(Unit *unit, uint16_t halfword);
/**
* Write a word to the 1-wire bus
*/
void ow_write_u32(Unit *unit, uint32_t word);
/**
* Write a doubleword to the 1-wire bus
*/
void ow_write_u64(Unit *unit, uint64_t dword);
/**
* Read a byte form the 1-wire bus
*/
uint8_t ow_read_u8(Unit *unit);
/**
* Read a halfword form the 1-wire bus
*/
uint16_t ow_read_u16(Unit *unit);
/**
* Read a word form the 1-wire bus
*/
uint32_t ow_read_u32(Unit *unit);
/**
* Read a doubleword form the 1-wire bus
*/
uint64_t ow_read_u64(Unit *unit);
#endif //GEX_F072_OW_INTERNAL_H

193
units/1wire/_ow_ll.c
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@ -0,0 +1,193 @@
//
// Created by MightyPork on 2018/01/29.
//
// 1-Wire unit low level functions
//
#include "platform.h"
#include "unit_base.h"
#define OW_INTERNAL
#include "_ow_internal.h"
static inline void ow_pull_high(Unit *unit)
{
struct priv *priv = unit->data;
LL_GPIO_SetOutputPin(priv->port, priv->ll_pin);
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
}
static inline void ow_pull_low(Unit *unit)
{
struct priv *priv = unit->data;
LL_GPIO_ResetOutputPin(priv->port, priv->ll_pin);
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
}
static inline void ow_release_line(Unit *unit)
{
struct priv *priv = unit->data;
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_INPUT);
}
static inline bool ow_sample_line(Unit *unit)
{
struct priv *priv = unit->data;
return (bool) LL_GPIO_IsInputPinSet(priv->port, priv->ll_pin);
}
/**
* Reset the 1-wire bus
*/
bool ow_reset(Unit *unit)
{
ow_pull_low(unit);
PTIM_MicroDelay(500);
bool presence;
vPortEnterCritical();
{
// Strong pull-up (for parasitive power)
ow_pull_high(unit);
PTIM_MicroDelay(2);
// switch to open-drain
ow_release_line(unit);
PTIM_MicroDelay(118);
presence = !ow_sample_line(unit);
}
vPortExitCritical();
PTIM_MicroDelay(130);
return presence;
}
/**
* Write a bit to the 1-wire bus
*/
void ow_write_bit(Unit *unit, bool bit)
{
vPortEnterCritical();
{
// start mark
ow_pull_low(unit);
PTIM_MicroDelay(2);
if (bit) ow_pull_high(unit);
PTIM_MicroDelay(70);
// Strong pull-up (for parasitive power)
ow_pull_high(unit);
}
vPortExitCritical();
PTIM_MicroDelay(2);
}
/**
* Read a bit from the 1-wire bus
*/
bool ow_read_bit(Unit *unit)
{
bool bit;
vPortEnterCritical();
{
// start mark
ow_pull_low(unit);
PTIM_MicroDelay(2);
ow_release_line(unit);
PTIM_MicroDelay(20);
bit = ow_sample_line(unit);
}
vPortExitCritical();
PTIM_MicroDelay(40);
return bit;
}
/**
* Write a byte to the 1-wire bus
*/
void ow_write_u8(Unit *unit, uint8_t byte)
{
for (int i = 0; i < 8; i++) {
ow_write_bit(unit, 0 != (byte & (1 << i)));
}
}
/**
* Write a halfword to the 1-wire bus
*/
void ow_write_u16(Unit *unit, uint16_t halfword)
{
ow_write_u8(unit, (uint8_t) (halfword & 0xFF));
ow_write_u8(unit, (uint8_t) ((halfword >> 8) & 0xFF));
}
/**
* Write a word to the 1-wire bus
*/
void ow_write_u32(Unit *unit, uint32_t word)
{
ow_write_u16(unit, (uint16_t) (word));
ow_write_u16(unit, (uint16_t) (word >> 16));
}
/**
* Write a doubleword to the 1-wire bus
*/
void ow_write_u64(Unit *unit, uint64_t dword)
{
ow_write_u32(unit, (uint32_t) (dword));
ow_write_u32(unit, (uint32_t) (dword >> 32));
}
/**
* Read a byte form the 1-wire bus
*/
uint8_t ow_read_u8(Unit *unit)
{
uint8_t buf = 0;
for (int i = 0; i < 8; i++) {
buf |= (1 & ow_read_bit(unit)) << i;
}
return buf;
}
/**
* Read a halfword form the 1-wire bus
*/
uint16_t ow_read_u16(Unit *unit)
{
uint16_t acu = 0;
acu |= ow_read_u8(unit);
acu |= ow_read_u8(unit) << 8;
return acu;
}
/**
* Read a word form the 1-wire bus
*/
uint32_t ow_read_u32(Unit *unit)
{
uint32_t acu = 0;
acu |= ow_read_u16(unit);
acu |= (uint32_t)ow_read_u16(unit) << 16;
return acu;
}
/**
* Read a doubleword form the 1-wire bus
*/
uint64_t ow_read_u64(Unit *unit)
{
uint64_t acu = 0;
acu |= ow_read_u32(unit);
acu |= (uint64_t)ow_read_u32(unit) << 32;
return acu;
}

219
units/1wire/unit_1wire.c
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@ -8,15 +8,8 @@
#include "unit_1wire.h"
// 1WIRE master
/** Private data structure */
struct priv {
char port_name;
uint8_t pin_number;
GPIO_TypeDef *port;
uint32_t ll_pin;
};
#define OW_INTERNAL
#include "_ow_internal.h"
// ------------------------------------------------------------------------
@ -124,206 +117,6 @@ static void U1WIRE_deInit(Unit *unit)
// ------------------------------------------------------------------------
static inline void ow_pull_high(Unit *unit)
{
struct priv *priv = unit->data;
LL_GPIO_SetOutputPin(priv->port, priv->ll_pin);
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
}
static inline void ow_pull_low(Unit *unit)
{
struct priv *priv = unit->data;
LL_GPIO_ResetOutputPin(priv->port, priv->ll_pin);
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
}
static inline void ow_release_line(Unit *unit)
{
struct priv *priv = unit->data;
LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_INPUT);
}
static inline bool ow_sample_line(Unit *unit)
{
struct priv *priv = unit->data;
return (bool) LL_GPIO_IsInputPinSet(priv->port, priv->ll_pin);
}
/**
* Reset the 1-wire bus
*/
static bool ow_reset(Unit *unit)
{
ow_pull_low(unit);
PTIM_MicroDelay(500);
bool presence;
vPortEnterCritical();
{
// Strong pull-up (for parasitive power)
ow_pull_high(unit);
PTIM_MicroDelay(2);
// switch to open-drain
ow_release_line(unit);
PTIM_MicroDelay(118);
presence = !ow_sample_line(unit);
}
vPortExitCritical();
PTIM_MicroDelay(130);
return presence;
}
/**
* Write a bit to the 1-wire bus
*/
static void ow_write(Unit *unit, bool bit)
{
vPortEnterCritical();
{
// start mark
ow_pull_low(unit);
PTIM_MicroDelay(2);
if (bit) ow_pull_high(unit);
PTIM_MicroDelay(70);
// Strong pull-up (for parasitive power)
ow_pull_high(unit);
}
vPortExitCritical();
PTIM_MicroDelay(2);
}
/**
* Read a bit from the 1-wire bus
*/
static bool ow_read(Unit *unit)
{
bool bit;
vPortEnterCritical();
{
// start mark
ow_pull_low(unit);
PTIM_MicroDelay(2);
ow_release_line(unit);
PTIM_MicroDelay(20);
bit = ow_sample_line(unit);
}
vPortExitCritical();
PTIM_MicroDelay(40);
return bit;
}
/**
* Write a byte to the 1-wire bus
*/
static void ow_write_u8(Unit *unit, uint8_t byte)
{
for (int i = 0; i < 8; i++) {
ow_write(unit, 0 != (byte & (1 << i)));
}
}
/**
* Write a halfword to the 1-wire bus
*/
static void ow_write_u16(Unit *unit, uint16_t halfword)
{
ow_write_u8(unit, (uint8_t) (halfword & 0xFF));
ow_write_u8(unit, (uint8_t) ((halfword >> 8) & 0xFF));
}
/**
* Write a word to the 1-wire bus
*/
static void ow_write_u32(Unit *unit, uint32_t word)
{
ow_write_u16(unit, (uint16_t) (word));
ow_write_u16(unit, (uint16_t) (word >> 16));
}
/**
* Write a doubleword to the 1-wire bus
*/
static void ow_write_u64(Unit *unit, uint64_t dword)
{
ow_write_u32(unit, (uint32_t) (dword));
ow_write_u32(unit, (uint32_t) (dword >> 32));
}
/**
* Read a byte form the 1-wire bus
*/
static uint8_t ow_read_u8(Unit *unit)
{
uint8_t buf = 0;
for (int i = 0; i < 8; i++) {
buf <<= 1;
buf |= 1 & ow_read(unit);
}
return buf;
}
/**
* Read a halfword form the 1-wire bus
*/
static uint16_t ow_read_u16(Unit *unit)
{
uint16_t acu = 0;
acu |= ow_read_u8(unit);
acu |= ow_read_u8(unit) << 8;
return acu;
}
/**
* Read a word form the 1-wire bus
*/
static uint32_t ow_read_u32(Unit *unit)
{
uint32_t acu = 0;
acu |= ow_read_u16(unit);
acu |= (uint32_t)ow_read_u16(unit) << 16;
return acu;
}
/**
* Read a doubleword form the 1-wire bus
*/
static uint64_t ow_read_u64(Unit *unit)
{
uint64_t acu = 0;
acu |= ow_read_u32(unit);
acu |= (uint64_t)ow_read_u32(unit) << 32;
return acu;
}
// ------------------------------------------------------------------------
#define OW_ROM_SEARCH 0xF0
#define OW_ROM_READ 0x33
#define OW_ROM_MATCH 0x55
#define OW_ROM_SKIP 0xCC
#define OW_ROM_ALM_SEARCH 0xEC
#define OW_DS1820_CONVERT_T 0x44
#define OW_DS1820_WRITE_SCRATCH 0x4E
#define OW_DS1820_READ_SCRATCH 0xBE
#define OW_DS1820_COPY_SCRATCH 0x48
#define OW_DS1820_RECALL_E2 0xB8
#define OW_DS1820_READ_SUPPLY 0xB4
enum PinCmd_ {
CMD_TEST = 0,
};
@ -336,17 +129,20 @@ static error_t U1WIRE_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command,
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);
ow_pull_high(unit);
while (!ow_read_bit(unit));
osDelay(750);
// 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);
@ -362,6 +158,7 @@ static error_t U1WIRE_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command,
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;

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