HiPi-BCM2835
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BCM2835/src/doc/Doxyfile.in view on Meta::CPAN
# be useful for C code in case the coding convention dictates that all compound
# types are typedef'ed and only the typedef is referenced, never the tag name.
TYPEDEF_HIDES_STRUCT = NO
# The SYMBOL_CACHE_SIZE determines the size of the internal cache use to
# determine which symbols to keep in memory and which to flush to disk.
# When the cache is full, less often used symbols will be written to disk.
# For small to medium size projects (<1000 input files) the default value is
# probably good enough. For larger projects a too small cache size can cause
# doxygen to be busy swapping symbols to and from disk most of the time
# causing a significant performance penalty.
# If the system has enough physical memory increasing the cache will improve the
# performance by keeping more symbols in memory. Note that the value works on
# a logarithmic scale so increasing the size by one will roughly double the
# memory usage. The cache size is given by this formula:
# 2^(16+SYMBOL_CACHE_SIZE). The valid range is 0..9, the default is 0,
# corresponding to a cache size of 2^16 = 65536 symbols
SYMBOL_CACHE_SIZE = 0
BCM2835/src/install-sh view on Meta::CPAN
else
# Rename the file to the real destination.
$doit $mvcmd -f "$dsttmp" "$dst" 2>/dev/null ||
# The rename failed, perhaps because mv can't rename something else
# to itself, or perhaps because mv is so ancient that it does not
# support -f.
{
# Now remove or move aside any old file at destination location.
# We try this two ways since rm can't unlink itself on some
# systems and the destination file might be busy for other
# reasons. In this case, the final cleanup might fail but the new
# file should still install successfully.
{
test ! -f "$dst" ||
$doit $rmcmd -f "$dst" 2>/dev/null ||
{ $doit $mvcmd -f "$dst" "$rmtmp" 2>/dev/null &&
{ $doit $rmcmd -f "$rmtmp" 2>/dev/null; :; }
} ||
{ echo "$0: cannot unlink or rename $dst" >&2
(exit 1); exit 1
BCM2835/src/src/bcm2835.c view on Meta::CPAN
uint64_t start;
if (debug)
{
/* Cant access sytem timers in debug mode */
printf("bcm2835_delayMicroseconds %lld\n", (long long int) micros);
return;
}
/* Calling nanosleep() takes at least 100-200 us, so use it for
// long waits and use a busy wait on the System Timer for the rest.
*/
start = bcm2835_st_read();
/* Not allowed to access timer registers (result is not as precise)*/
if (start==0)
{
t1.tv_sec = 0;
t1.tv_nsec = 1000 * (long)(micros);
nanosleep(&t1, NULL);
return;
BCM2835/src/src/bcm2835.c view on Meta::CPAN
{
if ( bcm2835_clk == MAP_FAILED
|| bcm2835_pwm == MAP_FAILED)
return; /* bcm2835_init() failed or not root */
/* From Gerts code */
divisor &= 0xfff;
/* Stop PWM clock */
bcm2835_peri_write(bcm2835_clk + BCM2835_PWMCLK_CNTL, BCM2835_PWM_PASSWRD | 0x01);
bcm2835_delay(110); /* Prevents clock going slow */
/* Wait for the clock to be not busy */
while ((bcm2835_peri_read(bcm2835_clk + BCM2835_PWMCLK_CNTL) & 0x80) != 0)
bcm2835_delay(1);
/* set the clock divider and enable PWM clock */
bcm2835_peri_write(bcm2835_clk + BCM2835_PWMCLK_DIV, BCM2835_PWM_PASSWRD | (divisor << 12));
bcm2835_peri_write(bcm2835_clk + BCM2835_PWMCLK_CNTL, BCM2835_PWM_PASSWRD | 0x11); /* Source=osc and enable */
}
void bcm2835_pwm_set_mode(uint8_t channel, uint8_t markspace, uint8_t enabled)
{
if ( bcm2835_clk == MAP_FAILED
BCM2835/src/src/bcm2835.h view on Meta::CPAN
\version 1.7 Added bcm2835_spi_transfernb to support different buffers for read and write.
\version 1.8 Improvements to read barrier, as suggested by maddin.
\version 1.9 Improvements contributed by mikew:
I noticed that it was mallocing memory for the mmaps on /dev/mem.
It's not necessary to do that, you can just mmap the file directly,
so I've removed the mallocs (and frees).
I've also modified delayMicroseconds() to use nanosleep() for long waits,
and a busy wait on a high resolution timer for the rest. This is because
I've found that calling nanosleep() takes at least 100-200 us.
You need to link using '-lrt' using this version.
I've added some unsigned casts to the debug prints to silence compiler
warnings I was getting, fixed some typos, and changed the value of
BCM2835_PAD_HYSTERESIS_ENABLED to 0x08 as per Gert van Loo's doc at
http://www.scribd.com/doc/101830961/GPIO-Pads-Control2
Also added a define for the passwrd value that Gert says is needed to
change pad control settings.
\version 1.10 Changed the names of the delay functions to bcm2835_delay()
BCM2835/src/src/bcm2835.h view on Meta::CPAN
If the interval specified in req is not an exact multiple of the granularity
underlying clock (see time(7)), then the interval will be
rounded up to the next multiple. Furthermore, after the sleep completes,
there may still be a delay before the CPU becomes free to once
again execute the calling thread.
\param[in] millis Delay in milliseconds
*/
extern void bcm2835_delay (unsigned int millis);
/*! Delays for the specified number of microseconds.
Uses a combination of nanosleep() and a busy wait loop on the BCM2835 system timers,
However, you are at the mercy of nanosleep(). From the manual for nanosleep():
If the interval specified in req is not an exact multiple of the granularity
underlying clock (see time(7)), then the interval will be
rounded up to the next multiple. Furthermore, after the sleep completes,
there may still be a delay before the CPU becomes free to once
again execute the calling thread.
For times less than about 450 microseconds, uses a busy wait on the System Timer.
It is reported that a delay of 0 microseconds on RaspberryPi will in fact
result in a delay of about 80 microseconds. Your mileage may vary.
\param[in] micros Delay in microseconds
*/
extern void bcm2835_delayMicroseconds (uint64_t micros);
/*! Sets the output state of the specified pin
\param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin.
\param[in] on HIGH sets the output to HIGH and LOW to LOW.
*/
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