From 073d4d467f501f99334c43ef5583ae40888aa274 Mon Sep 17 00:00:00 2001 From: barthess Date: Thu, 18 Dec 2014 00:21:28 +0300 Subject: 1-wire. STM32F1xx code tested --- os/hal/src/onewire.c | 168 ++++++++++++++++++++++++++++++++------------------- 1 file changed, 105 insertions(+), 63 deletions(-) (limited to 'os/hal/src') diff --git a/os/hal/src/onewire.c b/os/hal/src/onewire.c index 724ff2f..c94cbac 100644 --- a/os/hal/src/onewire.c +++ b/os/hal/src/onewire.c @@ -18,14 +18,14 @@ /* Main ideas: */ /*=========================================================================== -1) switch PWM output pin it open drain mode. +1) switch PWM output pin to open drain mode. 2) start 2 channels _simultaneously_. First (master channel) generates pulses (read time slots) second (sample channel) generates interrupts - from where read pin function calls. + from where read pin function will be called. - --------------------------------------- master channel generates pulses - | / - -- + | / . + --............................. <---------- slave (not)pulls down bus here - ----------------------------- sample channel reads pad state | | ---------------- @@ -40,8 +40,8 @@ on every timer overflow event. /* General recommendations for strong pull usage */ /*=========================================================================== * 1) Use separate power rail instead of strong pull up whenever possible. - * Driver's strong pull up feature is very interrupt jitter sensible. - * 2) Use special 1-wire bus master (DS2484 for example) if you are + * Driver's strong pull up feature is very sensible to interrupt jitter. + * 2) Use specialized 1-wire bus master (DS2484 for example) if you are * forced to handle bus requiring strong pull up feature. */ @@ -76,7 +76,7 @@ on every timer overflow event. #define ONEWIRE_RESET_TOTAL_WIDTH 960 /** - * @brief Forward declarations. + * @brief Local function declarations. */ static void ow_reset_cb(PWMDriver *pwmp, onewireDriver *owp); static void pwm_reset_cb(PWMDriver *pwmp); @@ -101,17 +101,17 @@ onewireDriver OWD1; /* Driver local variables and types. */ /*===========================================================================*/ /** - * @brief Config for fast initialization of all fields + * @brief Config for fast initialization of all config's fields */ static const PWMConfig pwm_default_cfg = { 1000000, ONEWIRE_RESET_TOTAL_WIDTH, NULL, { - {PWM_OUTPUT_ACTIVE_LOW, NULL}, - {PWM_OUTPUT_ACTIVE_LOW, NULL}, - {PWM_OUTPUT_ACTIVE_LOW, NULL}, - {PWM_OUTPUT_ACTIVE_LOW, NULL} + {PWM_OUTPUT_DISABLED, NULL}, + {PWM_OUTPUT_DISABLED, NULL}, + {PWM_OUTPUT_DISABLED, NULL}, + {PWM_OUTPUT_DISABLED, NULL} }, 0, 0 @@ -158,6 +158,41 @@ static const uint8_t onewire_crc_table[256] = { /*===========================================================================*/ /* Driver local functions. */ /*===========================================================================*/ +/** + * @brief Put bus in idle mode. + */ +static void onewire_bus_idle(onewireDriver *owp) { +#if defined(STM32F1XX) + palSetPadMode(owp->config->port, owp->config->pad, + owp->config->pad_mode_idle); +#endif + pwmStop(owp->config->pwmd); +} + +/** + * @brief Put bus in active mode. + */ +static void onewire_bus_active(onewireDriver *owp) { + pwmStart(owp->config->pwmd, &owp->pwmcfg); +#if defined(STM32F1XX) + palSetPadMode(owp->config->port, owp->config->pad, + owp->config->pad_mode_active); +#endif +} + +/** + * @brief Function performing read of single bit. + * @note It must be callable from any context. + */ +static uint_fast8_t readBitX(onewireDriver *owp) { +#if ONEWIRE_SYNTH_SEARCH_TEST + (void)owp; + return _synth_ow_read_bit(); +#else + return palReadPad(owp->config->port, owp->config->pad); +#endif +} + /** * @brief PWM adapter */ @@ -226,7 +261,7 @@ static void ow_write_bit_I(onewireDriver *owp, uint_fast8_t bit) { */ static void ow_reset_cb(PWMDriver *pwmp, onewireDriver *owp) { - owp->reg.slave_present = (PAL_LOW == owp->config->readBitX()); + owp->reg.slave_present = (PAL_LOW == readBitX(owp)); osalSysLockFromISR(); pwmDisableChannelI(pwmp, owp->config->sample_channel); @@ -253,7 +288,7 @@ static void ow_read_bit_cb(PWMDriver *pwmp, onewireDriver *owp) { return; } else { - *owp->buf |= owp->config->readBitX() << owp->reg.bit; + *owp->buf |= readBitX(owp) << owp->reg.bit; owp->reg.bit++; if (8 == owp->reg.bit) { owp->reg.bit = 0; @@ -414,11 +449,11 @@ static void ow_search_rom_cb(PWMDriver *pwmp, onewireDriver *owp) { onewire_search_rom_t *sr = &owp->search_rom; if (0 == sr->reg.bit_step) { /* read direct bit */ - sr->reg.bit_buf |= owp->config->readBitX(); + sr->reg.bit_buf |= readBitX(owp); sr->reg.bit_step++; } else if (1 == sr->reg.bit_step) { /* read complement bit */ - sr->reg.bit_buf |= owp->config->readBitX() << 1; + sr->reg.bit_buf |= readBitX(owp) << 1; sr->reg.bit_step++; switch(sr->reg.bit_buf){ case 0b11: @@ -572,7 +607,6 @@ void onewireObjectInit(onewireDriver *owp) { void onewireStart(onewireDriver *owp, const onewireConfig *config) { osalDbgCheck((NULL != owp) && (NULL != config)); - osalDbgCheck(NULL != config->readBitX); osalDbgAssert(PWM_STOP == config->pwmd->state, "PWM will be started by onewire driver internally"); osalDbgAssert(ONEWIRE_STOP == owp->reg.state, "Invalid state"); @@ -582,7 +616,11 @@ void onewireStart(onewireDriver *owp, const onewireConfig *config) { #endif owp->config = config; - pwmStart(owp->config->pwmd, &pwm_default_cfg); +#if !defined(STM32F1XX) + palSetPadMode(owp->config->port, owp->config->pad, + owp->config->pad_mode_active); +#endif + onewire_bus_idle(owp); owp->reg.state = ONEWIRE_READY; } @@ -598,6 +636,7 @@ void onewireStop(onewireDriver *owp) { #if ONEWIRE_USE_STRONG_PULLUP owp->config->pullup_release(); #endif + onewire_bus_idle(owp); pwmStop(owp->config->pwmd); owp->config = NULL; owp->reg.state = ONEWIRE_STOP; @@ -613,41 +652,40 @@ void onewireStop(onewireDriver *owp) { */ bool onewireReset(onewireDriver *owp) { PWMDriver *pwmd; + size_t mch, sch; osalDbgCheck(NULL != owp); osalDbgAssert(owp->reg.state == ONEWIRE_READY, "Invalid state"); /* short circuit on bus or any other device transmit data */ - if (PAL_LOW == owp->config->readBitX()) + if (PAL_LOW == readBitX(owp)) return false; - palSetPad(GPIOC, GPIOC_LED); - pwmd = owp->config->pwmd; + mch = owp->config->master_channel; + sch = owp->config->sample_channel; owp->pwmcfg.period = ONEWIRE_RESET_LOW_WIDTH + ONEWIRE_RESET_SAMPLE_WIDTH; owp->pwmcfg.callback = NULL; - owp->pwmcfg.channels[owp->config->master_channel].callback = NULL; - owp->pwmcfg.channels[owp->config->master_channel].mode = PWM_OUTPUT_ACTIVE_LOW; - owp->pwmcfg.channels[owp->config->sample_channel].callback = pwm_reset_cb; - owp->pwmcfg.channels[owp->config->sample_channel].mode = PWM_OUTPUT_ACTIVE_LOW; + owp->pwmcfg.channels[mch].callback = NULL; + owp->pwmcfg.channels[mch].mode = PWM_OUTPUT_ACTIVE_LOW; + owp->pwmcfg.channels[sch].callback = pwm_reset_cb; + owp->pwmcfg.channels[sch].mode = PWM_OUTPUT_ACTIVE_LOW; - pwmStart(pwmd, &owp->pwmcfg); - palSetPadMode(GPIOB, 8, PAL_MODE_STM32_ALTERNATE_OPENDRAIN); - pwmEnableChannel(pwmd, owp->config->master_channel, ONEWIRE_RESET_LOW_WIDTH); - pwmEnableChannel(pwmd, owp->config->sample_channel, ONEWIRE_RESET_SAMPLE_WIDTH); - pwmEnableChannelNotification(pwmd, owp->config->sample_channel); + onewire_bus_active(owp); + pwmEnableChannel(pwmd, mch, ONEWIRE_RESET_LOW_WIDTH); + pwmEnableChannel(pwmd, sch, ONEWIRE_RESET_SAMPLE_WIDTH); + pwmEnableChannelNotification(pwmd, sch); osalSysLock(); osalThreadSuspendS(&owp->thread); osalSysUnlock(); - palSetPadMode(GPIOB, 8, PAL_MODE_INPUT); - pwmStop(pwmd); + onewire_bus_idle(owp); /* wait until slave release bus to discriminate short circuit condition */ osalThreadSleepMicroseconds(500); - return (PAL_HIGH == owp->config->readBitX()) && (true == owp->reg.slave_present); + return (PAL_HIGH == readBitX(owp)) && (true == owp->reg.slave_present); } /** @@ -659,6 +697,7 @@ bool onewireReset(onewireDriver *owp) { */ void onewireRead(onewireDriver *owp, uint8_t *rxbuf, size_t rxbytes) { PWMDriver *pwmd; + size_t mch, sch; osalDbgCheck((NULL != owp) && (NULL != rxbuf)); osalDbgCheck((rxbytes > 0) && (rxbytes < 65536)); @@ -669,6 +708,8 @@ void onewireRead(onewireDriver *owp, uint8_t *rxbuf, size_t rxbytes) { memset(rxbuf, 0, rxbytes); pwmd = owp->config->pwmd; + mch = owp->config->master_channel; + sch = owp->config->sample_channel; owp->reg.bit = 0; owp->reg.final_timeslot = false; @@ -677,23 +718,21 @@ void onewireRead(onewireDriver *owp, uint8_t *rxbuf, size_t rxbytes) { owp->pwmcfg.period = ONEWIRE_ZERO_WIDTH + ONEWIRE_RECOVERY_WIDTH; owp->pwmcfg.callback = NULL; - owp->pwmcfg.channels[owp->config->master_channel].callback = NULL; - owp->pwmcfg.channels[owp->config->master_channel].mode = PWM_OUTPUT_ACTIVE_LOW; - owp->pwmcfg.channels[owp->config->sample_channel].callback = pwm_read_bit_cb; - owp->pwmcfg.channels[owp->config->sample_channel].mode = PWM_OUTPUT_ACTIVE_LOW; + owp->pwmcfg.channels[mch].callback = NULL; + owp->pwmcfg.channels[mch].mode = PWM_OUTPUT_ACTIVE_LOW; + owp->pwmcfg.channels[sch].callback = pwm_read_bit_cb; + owp->pwmcfg.channels[sch].mode = PWM_OUTPUT_ACTIVE_LOW; - pwmStart(pwmd, &owp->pwmcfg); - palSetPadMode(GPIOB, 8, PAL_MODE_STM32_ALTERNATE_OPENDRAIN); - pwmEnableChannel(pwmd, owp->config->master_channel, ONEWIRE_ONE_WIDTH); - pwmEnableChannel(pwmd, owp->config->sample_channel, ONEWIRE_SAMPLE_WIDTH); - pwmEnableChannelNotification(pwmd, owp->config->sample_channel); + onewire_bus_active(owp); + pwmEnableChannel(pwmd, mch, ONEWIRE_ONE_WIDTH); + pwmEnableChannel(pwmd, sch, ONEWIRE_SAMPLE_WIDTH); + pwmEnableChannelNotification(pwmd, sch); osalSysLock(); osalThreadSuspendS(&owp->thread); osalSysUnlock(); - palSetPadMode(GPIOB, 8, PAL_MODE_INPUT); - pwmStop(pwmd); + onewire_bus_idle(owp); } /** @@ -708,6 +747,7 @@ void onewireRead(onewireDriver *owp, uint8_t *rxbuf, size_t rxbytes) { void onewireWrite(onewireDriver *owp, uint8_t *txbuf, size_t txbytes, systime_t pullup_time) { PWMDriver *pwmd; + size_t mch, sch; osalDbgCheck((NULL != owp) && (NULL != txbuf)); osalDbgCheck((txbytes > 0) && (txbytes < 65536)); @@ -718,6 +758,8 @@ void onewireWrite(onewireDriver *owp, uint8_t *txbuf, #endif pwmd = owp->config->pwmd; + mch = owp->config->master_channel; + sch = owp->config->sample_channel; owp->buf = txbuf; owp->reg.bit = 0; @@ -726,10 +768,10 @@ void onewireWrite(onewireDriver *owp, uint8_t *txbuf, owp->pwmcfg.period = ONEWIRE_ZERO_WIDTH + ONEWIRE_RECOVERY_WIDTH; owp->pwmcfg.callback = pwm_write_bit_cb; - owp->pwmcfg.channels[owp->config->master_channel].callback = NULL; - owp->pwmcfg.channels[owp->config->master_channel].mode = PWM_OUTPUT_ACTIVE_LOW; - owp->pwmcfg.channels[owp->config->sample_channel].callback = NULL; - owp->pwmcfg.channels[owp->config->sample_channel].mode = PWM_OUTPUT_DISABLED; + owp->pwmcfg.channels[mch].callback = NULL; + owp->pwmcfg.channels[mch].mode = PWM_OUTPUT_ACTIVE_LOW; + owp->pwmcfg.channels[sch].callback = NULL; + owp->pwmcfg.channels[sch].mode = PWM_OUTPUT_DISABLED; #if ONEWIRE_USE_STRONG_PULLUP if (pullup_time > 0) { @@ -738,8 +780,7 @@ void onewireWrite(onewireDriver *owp, uint8_t *txbuf, } #endif - pwmStart(pwmd, &owp->pwmcfg); - palSetPadMode(GPIOB, 8, PAL_MODE_STM32_ALTERNATE_OPENDRAIN); + onewire_bus_active(owp); pwmEnablePeriodicNotification(pwmd); osalSysLock(); @@ -747,8 +788,7 @@ void onewireWrite(onewireDriver *owp, uint8_t *txbuf, osalSysUnlock(); pwmDisablePeriodicNotification(pwmd); - palSetPadMode(GPIOB, 8, PAL_MODE_INPUT); - pwmStop(pwmd); + onewire_bus_idle(owp); #if ONEWIRE_USE_STRONG_PULLUP if (pullup_time > 0) { @@ -776,6 +816,7 @@ size_t onewireSearchRom(onewireDriver *owp, uint8_t *result, size_t max_rom_cnt) { PWMDriver *pwmd; uint8_t cmd; + size_t mch, sch; osalDbgCheck(NULL != owp); osalDbgAssert(ONEWIRE_READY == owp->reg.state, "Invalid state"); @@ -783,6 +824,8 @@ size_t onewireSearchRom(onewireDriver *owp, uint8_t *result, pwmd = owp->config->pwmd; cmd = ONEWIRE_CMD_SEARCH_ROM; + mch = owp->config->master_channel; + sch = owp->config->sample_channel; search_clean_start(&owp->search_rom); @@ -807,22 +850,21 @@ size_t onewireSearchRom(onewireDriver *owp, uint8_t *result, /* Reconfiguration always needed because of previous call onewireWrite.*/ owp->pwmcfg.period = ONEWIRE_ZERO_WIDTH + ONEWIRE_RECOVERY_WIDTH; owp->pwmcfg.callback = NULL; - owp->pwmcfg.channels[owp->config->master_channel].callback = NULL; - owp->pwmcfg.channels[owp->config->master_channel].mode = PWM_OUTPUT_ACTIVE_LOW; - owp->pwmcfg.channels[owp->config->sample_channel].callback = pwm_search_rom_cb; - owp->pwmcfg.channels[owp->config->sample_channel].mode = PWM_OUTPUT_ACTIVE_LOW; - pwmStart(pwmd, &owp->pwmcfg); - palSetPadMode(GPIOB, 8, PAL_MODE_STM32_ALTERNATE_OPENDRAIN); - pwmEnableChannel(pwmd, owp->config->master_channel, ONEWIRE_ONE_WIDTH); - pwmEnableChannel(pwmd, owp->config->sample_channel, ONEWIRE_SAMPLE_WIDTH); - pwmEnableChannelNotification(pwmd, owp->config->sample_channel); + owp->pwmcfg.channels[mch].callback = NULL; + owp->pwmcfg.channels[mch].mode = PWM_OUTPUT_ACTIVE_LOW; + owp->pwmcfg.channels[sch].callback = pwm_search_rom_cb; + owp->pwmcfg.channels[sch].mode = PWM_OUTPUT_ACTIVE_LOW; + + onewire_bus_active(owp); + pwmEnableChannel(pwmd, mch, ONEWIRE_ONE_WIDTH); + pwmEnableChannel(pwmd, sch, ONEWIRE_SAMPLE_WIDTH); + pwmEnableChannelNotification(pwmd, sch); osalSysLock(); osalThreadSuspendS(&owp->thread); osalSysUnlock(); - palSetPadMode(GPIOB, 8, PAL_MODE_INPUT); - pwmStop(pwmd); + onewire_bus_idle(owp); if (ONEWIRE_SEARCH_ROM_ERROR != owp->search_rom.reg.result) { /* check CRC and return 0 (error status) if mismatch */ -- cgit v1.2.3