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apa102: added extra functionality

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Exposed call to MRAA SPI frequency for those super long strips where the clock signal will degrade and introduce glitches. Slowing down will fix it without the need for extra filtering or redrivers. Batch mode also helps since only one write per frame will be required.

Added functions that control brightness only for fade effects without the need to keep an extra copy of the pixel color map.

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Mihai Tudor Panu 2016-08-25 17:33:41 -07:00
parent 9a83bb7530
commit 2d2ee8d1f0
2 changed files with 61 additions and 4 deletions
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30
src/apa102/apa102.cxx
View File

@ -96,6 +96,12 @@ APA102::setLed(uint16_t ledIdx, uint8_t brightness, uint8_t r, uint8_t g, uint8_
setLeds(ledIdx, ledIdx, brightness, r, g, b);
}
void
APA102::setLedBrightness(uint16_t ledIdx, uint8_t brightness)
{
setLedsBrightness(ledIdx, ledIdx, brightness);
}
void
APA102::setAllLeds(uint8_t brightness, uint8_t r, uint8_t g, uint8_t b)
{
@ -120,6 +126,21 @@ APA102::setLeds(uint16_t startIdx, uint16_t endIdx, uint8_t brightness, uint8_t
}
}
void
APA102::setLedsBrightness(uint16_t startIdx, uint16_t endIdx, uint8_t brightness)
{
uint16_t s_idx = (startIdx + 1) * 4;
uint16_t e_idx = (endIdx + 1) * 4;
for (uint16_t i = s_idx; i <= e_idx; i += 4) {
m_leds[i] = brightness | 224;
}
if (!m_batchMode) {
pushState();
}
}
void
APA102::setLeds(uint16_t startIdx, uint16_t endIdx, uint8_t* colors)
{
@ -131,6 +152,15 @@ APA102::setLeds(uint16_t startIdx, uint16_t endIdx, uint8_t* colors)
}
}
void
APA102::setBusSpeed(int hz)
{
if (m_spi->frequency(hz) != mraa::SUCCESS) {
throw std::runtime_error(std::string(__FUNCTION__) +
": Failed to change SPI bus speed");
}
}
void
APA102::pushState(void)
{

35
src/apa102/apa102.hpp
View File

@ -74,7 +74,7 @@ class APA102
~APA102();
/**
* Change the color for a single led
* Change the color and brightness for a single led
*
* @param ledIdx Index of the LED in the strip (0 based)
* @param brightness Brightness value (0-31)
@ -85,7 +85,15 @@ class APA102
void setLed(uint16_t ledIdx, uint8_t brightness, uint8_t r, uint8_t g, uint8_t b);
/**
* Change the color for all leds
* Change the brightness for a single led
*
* @param ledIdx Index of the LED in the strip (0 based)
* @param brightness Brightness value (0-31)
*/
void setLedBrightness(uint16_t ledIdx, uint8_t brightness);
/**
* Change the color and brightness for all leds
*
* @param brightness Brightness value (0-31)
* @param r Red component (0-255)
@ -95,7 +103,7 @@ class APA102
void setAllLeds(uint8_t brightness, uint8_t r, uint8_t g, uint8_t b);
/**
* Change the color for a range of leds
* Change the color and brightness for a range of leds
*
* @param startIdx Start index of the range of LEDs in the strip (0 based)
* @param endIdx End index of the range of LEDs in the strip (0 based)
@ -108,7 +116,17 @@ class APA102
setLeds(uint16_t startIdx, uint16_t endIdx, uint8_t brightness, uint8_t r, uint8_t g, uint8_t b);
/**
* (Advanced) Manually control the colors of a range of LEDS
* Change the brightness for a range of leds
*
* @param startIdx Start index of the range of LEDs in the strip (0 based)
* @param endIdx End index of the range of LEDs in the strip (0 based)
* @param brightness Brightness value (0-31)
*/
void
setLedsBrightness(uint16_t startIdx, uint16_t endIdx, uint8_t brightness);
/**
* (Advanced) Manually control the colors and brightness of a range of LEDS
* Best used to maximize performance
*
* @param startIdx Start index of the range of LEDs to update (0 based)
@ -120,6 +138,15 @@ class APA102
*/
void setLeds(uint16_t startIdx, uint16_t endIdx, uint8_t* colors);
/**
* Change the speed/frequency of the SPI bus
* Note: Slower speeds will allow driving longer strips without having to
* condition the clock signal with extra hardware
*
* @param hz Desired bus speed in Hz
*/
void setBusSpeed(int hz);
/**
* Outputs the current LED data to the SPI bus
* Note: Only required if batch mode is set to TRUE