Eureka!!!
The STM32 has only one data register for all channels. So I want to use the ADC over DMA.
Issues are: It is not possible to stop the DMA or the ADC without uninit and init the hole parts.
We have more or less one option. Manually start the ADC.
So what we have now. We start the ADC after reading the values from DMA buffer. The ADC now make a conversion of all channels.
We can read also the values because it uses a double buffer mode. With that mode we can read the unused buffer.
This test code in SysTickHandler() should give you a rather
accurate clock with only a few seconds deviation per hour:
#include "serial.h"
#include "sersendf.h"
void SysTick_Handler(void) {
static uint32_t count = 0;
static uint8_t minutes = 0, seconds = 0;
count++;
if ( ! (count % 500)) { // A full second.
seconds++;
if ( ! (seconds % 60)) {
seconds = 0;
minutes++;
}
sersendf_P(PSTR("%su:"), minutes);
if (seconds < 10)
serial_writechar('0');
sersendf_P(PSTR("%su\n"), seconds);
}
[...]
On ARM we use only the 16 byte hardware buffer for sending and
receiving over the serial line, which is often too short for
debugging messages. This implementation works fine and still
neither blocks nor introduces delays for short messages.
Removed while-loop. Looks like we need some more us than the LPC?!? With +7us
we do not lose characters anymore.
We have only one UART, we use only one UART, so it's pointless to
do pin mapping calculations at runtime.
SIZES ARM... stm32f411
FLASH : 4832 bytes 1%
RAM : 404 bytes 1%
EEPROM : 0 bytes 0%
@phord abstract this to: This happens only when !recalc_speed,
meaning we are cruising, not accelerating or decelerating. So it
pegs our dda->c at c_min if it never made it as far as c_min.
This commit will fix https://github.com/Traumflug/Teacup_Firmware/issues/69
delta_um can become very small, where maximum_feedrate_P is constant.
When moving this division out of the loop, the result can be wrong.
dda->total_steps becomes also very small with delta_um. So this will fit perfectly.
This reverts commit cd66feb8d1.
So let's bring this part back.
We save 35 clock cycles at 'LED on time maximum'
ATmega sizes '168 '328(P) '644(P) '1280
Program: 18038 bytes 126% 59% 29% 14%
Data: 1936 bytes 190% 95% 48% 24%
EEPROM: 32 bytes 4% 2% 2% 1%
short-moves.gcode statistics:
LED on occurences: 888.
LED on time minimum: 217 clock cycles.
LED on time maximum: 520 clock cycles.
LED on time average: 249.626 clock cycles.
smooth-curves.gcode statistics:
LED on occurences: 22589.
LED on time minimum: 217 clock cycles.
LED on time maximum: 537 clock cycles.
LED on time average: 284.747 clock cycles.
triangle-odd.gcode statistics:
LED on occurences: 1636.
LED on time minimum: 217 clock cycles.
LED on time maximum: 520 clock cycles.
LED on time average: 270.933 clock cycles.
ATmega sizes '168 '328(P) '644(P) '1280
Program: 18266 bytes 128% 60% 29% 15%
Data: 1936 bytes 190% 95% 48% 24%
EEPROM: 32 bytes 4% 2% 2% 1%
short-moves.gcode statistics:
LED on occurences: 888.
LED on time minimum: 243 clock cycles.
LED on time maximum: 555 clock cycles.
LED on time average: 250.375 clock cycles.
smooth-curves.gcode statistics:
LED on occurences: 22589.
LED on time minimum: 243 clock cycles.
LED on time maximum: 572 clock cycles.
LED on time average: 292.139 clock cycles.
triangle-odd.gcode statistics:
LED on occurences: 1636.
LED on time minimum: 243 clock cycles.
LED on time maximum: 555 clock cycles.
LED on time average: 275.699 clock cycles.
start the simulation with ./parse_clean xyz, where 'xyz' can be anything to name the created files.
in the end you will get 3 pictures.
swan-reference-xyz.png how it should looks like.
swan-current-xyz.png how it will looks now.
swan-diff-xyz.png is the difference.
This 3 pictures show only the X-axis.
you will get also a forth file. pp-xyz.asc. you can open this file for example with meshlab and you can see that current model in 3d.
If you want to use your own gcode, please do the following:
Create a normal gcode. Delete any M116 (temp waitings). Maybe you want also deleting comments.
Then add M114 for every x line.
I do this with the swan-test.gcode:
sed '1~2 s/$/\nM114/g' < swan.gcode > swan-test.gcode
Nico Tonnhofer