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AP_HAL_ChibiOS: allocate DMA and LED buffers correctly when the length changes 

calculate DMAR pulse times correctly
ensure 50us pulse separation for LED
make sure the LEDs are signalled for output
only allow LED length to be set once
This commit is contained in:
Andy Piper 2021-02-06 17:59:04 +00:00 committed by Andrew Tridgell
parent a98f85502a
commit 3a9107245c
3 changed files with 67 additions and 44 deletions
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102
libraries/AP_HAL_ChibiOS/RCOutput.cpp
View File

@ -517,20 +517,10 @@ bool RCOutput::mode_requires_dma(enum output_mode mode) const
This is used for both DShot and serial output
*/
bool RCOutput::setup_group_DMA(pwm_group &group, uint32_t bitrate, uint32_t bit_width, bool active_high, const uint16_t buffer_length, bool choose_high)
bool RCOutput::setup_group_DMA(pwm_group &group, uint32_t bitrate, uint32_t bit_width, bool active_high, const uint16_t buffer_length, bool choose_high,
uint32_t pulse_time_us)
{
#ifndef DISABLE_DSHOT
if (!group.dma_buffer || buffer_length != group.dma_buffer_len) {
if (group.dma_buffer) {
hal.util->free_type(group.dma_buffer, group.dma_buffer_len, AP_HAL::Util::MEM_DMA_SAFE);
group.dma_buffer_len = 0;
}
group.dma_buffer = (uint32_t *)hal.util->malloc_type(buffer_length, AP_HAL::Util::MEM_DMA_SAFE);
if (!group.dma_buffer) {
return false;
}
group.dma_buffer_len = buffer_length;
}
// for dshot we setup for DMAR based output
if (!group.dma_handle) {
group.dma_handle = new Shared_DMA(group.dma_up_stream_id, SHARED_DMA_NONE,
@ -543,6 +533,21 @@ bool RCOutput::setup_group_DMA(pwm_group &group, uint32_t bitrate, uint32_t bit_
// hold the lock during setup, to ensure there isn't a DMA operation ongoing
group.dma_handle->lock();
if (!group.dma_buffer || buffer_length != group.dma_buffer_len) {
if (group.dma_buffer) {
hal.util->free_type(group.dma_buffer, group.dma_buffer_len, AP_HAL::Util::MEM_DMA_SAFE);
group.dma_buffer_len = 0;
}
group.dma_buffer = (uint32_t *)hal.util->malloc_type(buffer_length, AP_HAL::Util::MEM_DMA_SAFE);
if (!group.dma_buffer) {
group.dma_handle->unlock();
return false;
}
group.dma_buffer_len = buffer_length;
}
// reset the pulse time inside the lock
group.dshot_pulse_time_us = pulse_time_us;
#ifdef HAL_WITH_BIDIR_DSHOT
// configure input capture DMA if required
if (is_bidir_dshot_enabled()) {
@ -664,15 +669,15 @@ void RCOutput::set_group_mode(pwm_group &group)
const uint8_t pad_end_bits = 8;
const uint8_t pad_start_bits = 1;
const uint8_t channels_per_group = 4;
const uint16_t bit_length = bits_per_pixel * channels_per_group * group.serial_nleds + (pad_start_bits + pad_end_bits) * channels_per_group;
const uint16_t buffer_length = bit_length * sizeof(uint32_t);
const uint16_t bit_length = bits_per_pixel * group.serial_nleds + pad_start_bits + pad_end_bits;
const uint16_t buffer_length = bit_length * sizeof(uint32_t) * channels_per_group;
// calculate min time between pulses taking into account the DMAR parallelism
const uint32_t pulse_time_us = 1000000UL * bit_length / rate;
if (!setup_group_DMA(group, rate, bit_period, active_high, buffer_length, true)) {
if (!setup_group_DMA(group, rate, bit_period, active_high, buffer_length, true, pulse_time_us)) {
group.current_mode = MODE_PWM_NONE;
break;
}
// calculate min time between pulses
group.dshot_pulse_time_us = 1000000UL * bit_length / rate;
break;
}
@ -680,20 +685,19 @@ void RCOutput::set_group_mode(pwm_group &group)
const uint32_t rate = protocol_bitrate(group.current_mode);
const uint32_t bit_period = 20;
bool active_high = is_bidir_dshot_enabled() ? false : true;
// calculate min time between pulses
const uint32_t pulse_send_time_us = 1000000UL * dshot_bit_length / rate;
// configure timer driver for DMAR at requested rate
if (!setup_group_DMA(group, rate, bit_period, active_high,
MAX(DSHOT_BUFFER_LENGTH, GCR_TELEMETRY_BUFFER_LEN), false)) {
MAX(DSHOT_BUFFER_LENGTH, GCR_TELEMETRY_BUFFER_LEN), false, pulse_send_time_us)) {
group.current_mode = MODE_PWM_NORMAL;
break;
}
// calculate min time between pulses
group.dshot_pulse_send_time_us = 1000000UL * dshot_bit_length / rate;
if (is_bidir_dshot_enabled()) {
group.dshot_pulse_send_time_us = pulse_send_time_us;
// to all intents and purposes the pulse time of send and receive are the same
group.dshot_pulse_time_us = group.dshot_pulse_send_time_us + group.dshot_pulse_send_time_us + 30;
} else {
group.dshot_pulse_time_us = group.dshot_pulse_send_time_us;
group.dshot_pulse_time_us = pulse_send_time_us + pulse_send_time_us + 30;
}
break;
}
@ -745,6 +749,8 @@ void RCOutput::set_output_mode(uint16_t mask, const enum output_mode mode)
if (mode > MODE_PWM_NORMAL) {
fast_channel_mask |= group.ch_mask;
}
// setup of the group mode also sets up DMA which might have changed, so always
// redo it if using DMA
if (group.current_mode != thismode) {
group.current_mode = thismode;
set_group_mode(group);
@ -1075,6 +1081,8 @@ void RCOutput::dshot_send(pwm_group &group, bool blocking)
return;
}
osalDbgAssert(group.dma_buffer, "DMA buffer was null!");
#ifdef HAL_WITH_BIDIR_DSHOT
// assume that we won't be able to get the input capture lock
group.bdshot.enabled = false;
@ -1286,7 +1294,9 @@ void RCOutput::dma_up_irq_callback(void *p, uint32_t flags)
chEvtSignalI(irq.waiter, serial_event_mask);
} else {
// this prevents us ever having two dshot pulses too close together
chVTSetI(&group->dma_timeout, chTimeUS2I(group->dshot_pulse_time_us + 40), dma_unlock, p);
// dshot mandates a minimum pulse separation of 40us, WS2812 mandates 50us so we
// pick the higher value
chVTSetI(&group->dma_timeout, chTimeUS2I(50), dma_unlock, p);
}
chSysUnlockFromISR();
}
@ -1341,7 +1351,7 @@ bool RCOutput::serial_setup_output(uint8_t chan, uint32_t baudrate, uint16_t cha
// channels in blheli pass-thru fast
for (auto &group : pwm_group_list) {
if (group.ch_mask & chanmask) {
if (!setup_group_DMA(group, baudrate, 10, false, DSHOT_BUFFER_LENGTH, false)) {
if (!setup_group_DMA(group, baudrate, 10, false, DSHOT_BUFFER_LENGTH, false, 10)) {
serial_end();
return false;
}
@ -1809,11 +1819,10 @@ bool RCOutput::set_serial_led_num_LEDs(const uint16_t chan, uint8_t num_leds, ou
// we must hold the LED mutex while resizing the array
WITH_SEMAPHORE(grp->serial_led_mutex);
// nothing is as nothing does
if (grp->serial_nleds == num_leds
&& mode == grp->current_mode
&& grp->serial_led_data[i] != nullptr) {
return true;
// if already allocated then return
if (grp->serial_nleds > 0 || num_leds == 0
|| (mode != MODE_NEOPIXEL && mode != MODE_PROFILED)) {
return false;
}
switch (mode) {
@ -1839,13 +1848,22 @@ bool RCOutput::set_serial_led_num_LEDs(const uint16_t chan, uint8_t num_leds, ou
return false;
}
// allocate the data storage array
// allocate the data storage array, since the group num_leds is changing
/// we need to do all that are allocated
if (grp->serial_nleds != num_leds || grp->serial_led_data[i] == nullptr) {
if (grp->serial_led_data[i] != nullptr) {
delete[] grp->serial_led_data[i];
grp->serial_led_data[i] = nullptr;
for (uint8_t j = 0; j < 4; j++) {
if (grp->serial_led_data[j] != nullptr) {
delete[] grp->serial_led_data[j];
grp->serial_led_data[j] = nullptr;
if (num_leds > 0) {
grp->serial_led_data[j] = new SerialLed[num_leds];
if (grp->serial_led_data[j] == nullptr) {
num_leds = 0;
}
}
}
}
if (num_leds > 0) {
if (num_leds > 0 && grp->serial_led_data[i] == nullptr) {
grp->serial_led_data[i] = new SerialLed[num_leds];
if (grp->serial_led_data[i] == nullptr) {
num_leds = 0;
@ -1854,7 +1872,7 @@ bool RCOutput::set_serial_led_num_LEDs(const uint16_t chan, uint8_t num_leds, ou
grp->serial_nleds = num_leds;
}
// at this point the group led data is all setup but the dma buffer still needs to be resized
set_output_mode(1U<<chan, mode);
return grp->current_mode == mode;
@ -1979,12 +1997,17 @@ void RCOutput::set_serial_led_rgb_data(const uint16_t chan, int8_t led, uint8_t
uint8_t i = 0;
pwm_group *grp = find_chan(chan, i);
if (!grp || grp->serial_nleds == 0) {
if (!grp) {
return;
}
WITH_SEMAPHORE(grp->serial_led_mutex);
if (grp->serial_nleds == 0 || led >= grp->serial_nleds
|| (grp->current_mode != MODE_NEOPIXEL && grp->current_mode != MODE_PROFILED)) {
return;
}
if (led == -1) {
grp->prepared_send = true;
for (uint8_t n=0; n<grp->serial_nleds; n++) {
@ -1995,6 +2018,7 @@ void RCOutput::set_serial_led_rgb_data(const uint16_t chan, int8_t led, uint8_t
// if not ouput clock and trailing frames, run through all LED's to do it now
if (!grp->prepared_send) {
grp->prepared_send = true;
for (uint8_t n=0; n<grp->serial_nleds; n++) {
serial_led_set_single_rgb_data(*grp, i, n, 0, 0, 0);
}
@ -2008,10 +2032,6 @@ void RCOutput::set_serial_led_rgb_data(const uint16_t chan, int8_t led, uint8_t
*/
void RCOutput::serial_led_set_single_rgb_data(pwm_group& group, uint8_t idx, uint8_t led, uint8_t red, uint8_t green, uint8_t blue)
{
if (led >= group.serial_nleds || (group.current_mode != MODE_NEOPIXEL && group.current_mode != MODE_PROFILED)) {
return;
}
switch (group.current_mode) {
case MODE_PROFILED:
case MODE_NEOPIXEL:

4
libraries/AP_HAL_ChibiOS/RCOutput.h
View File

@ -246,7 +246,6 @@ private:
Shared_DMA *dma_handle;
uint32_t *dma_buffer;
uint16_t dma_buffer_len;
bool have_lock;
bool pwm_started;
uint32_t bit_width_mul;
uint32_t rc_frequency;
@ -475,7 +474,8 @@ private:
static void dma_up_irq_callback(void *p, uint32_t flags);
static void dma_unlock(void *p);
bool mode_requires_dma(enum output_mode mode) const;
bool setup_group_DMA(pwm_group &group, uint32_t bitrate, uint32_t bit_width, bool active_high, const uint16_t buffer_length, bool choose_high);
bool setup_group_DMA(pwm_group &group, uint32_t bitrate, uint32_t bit_width, bool active_high,
const uint16_t buffer_length, bool choose_high, uint32_t pulse_time_us);
void send_pulses_DMAR(pwm_group &group, uint32_t buffer_length);
void set_group_mode(pwm_group &group);
static bool is_dshot_protocol(const enum output_mode mode);

5
libraries/AP_HAL_ChibiOS/RCOutput_bdshot.cpp
View File

@ -480,7 +480,10 @@ void RCOutput::dma_up_irq_callback(void *p, uint32_t flags)
TOGGLE_PIN_DEBUG(55);
} else {
// non-bidir case
chVTSetI(&group->dma_timeout, chTimeUS2I(group->dshot_pulse_time_us + 40), dma_unlock, p);
// this prevents us ever having two dshot pulses too close together
// dshot mandates a minimum pulse separation of 40us, WS2812 mandates 50us so we
// pick the higher value
chVTSetI(&group->dma_timeout, chTimeUS2I(50), dma_unlock, p);
}
chSysUnlockFromISR();