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kx122: Allow setting bus frequency to enable faster operation

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The hardcoded frequency of 10kHz was much slower than the capacity of the device

Signed-off-by: Antoine W. Campagna <AntoineW@Campagna.org>
This commit is contained in:
Antoine W. Campagna 2018-03-25 22:02:02 -04:00
parent 83f541a5db
commit 335d20e7fc
5 changed files with 16 additions and 7 deletions
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2
examples/c/kx122.c
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@ -43,7 +43,7 @@ int main(int argc, char **argv)
signal(SIGINT,sig_handler);
//! [Interesting]
kx122_context sensor = kx122_init(0,-1,24);
kx122_context sensor = kx122_init(0, -1, 24, 10000);
if (!sensor)
{
printf("kx122_init() failed.\n");

10
src/kx122/kx122.c
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@ -161,7 +161,7 @@ Sets acceleration scale of sensor and the buffer.
*/
static void kx122_map_grange(const kx122_context dev, KX122_RANGE_T grange);
kx122_context kx122_init(int bus, int addr, int chip_select_pin)
kx122_context kx122_init(int bus, int addr, int chip_select_pin, int spi_bus_frequency)
{
kx122_context dev = (kx122_context)malloc(sizeof(struct _kx122_context));
@ -190,6 +190,12 @@ kx122_context kx122_init(int bus, int addr, int chip_select_pin)
if(dev->using_spi){
if (spi_bus_frequency > 10000000){ // KX122 has a maximum SPI bus speed of 10MHz
printf("%s: bus frequency too high - KX122 has a maximum SPI bus speed of 10MHz.\n", __FUNCTION__);
kx122_close(dev);
return NULL;
}
if (!(dev->spi = mraa_spi_init(bus))){
printf("%s: mraa_spi_init() failed.\n", __FUNCTION__);
kx122_close(dev);
@ -205,7 +211,7 @@ kx122_context kx122_init(int bus, int addr, int chip_select_pin)
mraa_gpio_dir(dev->chip_select,MRAA_GPIO_OUT);
mraa_spi_mode(dev->spi,MRAA_SPI_MODE0);
if (mraa_spi_frequency(dev->spi,SPI_FREQUENCY)){
if (mraa_spi_frequency(dev->spi, spi_bus_frequency)){
printf("%s: mraa_spi_frequency() failed.\n", __FUNCTION__);
kx122_close(dev);
return NULL;

3
src/kx122/kx122.cxx
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@ -32,7 +32,8 @@
using namespace upm;
KX122::KX122(int bus, int addr, int chip_select) : m_kx122(kx122_init(bus,addr,chip_select))
KX122::KX122(int bus, int addr, int chip_select, int spi_bus_frequency)
: m_kx122(kx122_init(bus,addr,chip_select,spi_bus_frequency))
{
if(!m_kx122){
throw std::runtime_error(std::string(__FUNCTION__) + "kx122_init() failed");

5
src/kx122/kx122.h
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@ -47,7 +47,7 @@ extern "C"{
*/
//Frequency of the SPI connection
#define SPI_FREQUENCY 10000
#define DEFAULT_SPI_FREQUENCY 10000
//Default slave addresses for the sensor
#define KX122_DEFAULT_SLAVE_ADDR_1 0x1F
@ -170,9 +170,10 @@ If no errors occur, the device gets initialized with default values and gets set
@param bus I2C or SPI bus to use.
@param addr I2C address of the sensor.
@param chip_select Chip select pin for SPI.
@param spi_bus_frequency Speed of the SPI communication bus in Hz (ignored when using I2C).
@return The device context, or NULL if an error occurs.
*/
kx122_context kx122_init(int bus, int addr, int chip_select_pin);
kx122_context kx122_init(int bus, int addr, int chip_select_pin, int spi_bus_frequency);
/**
KX122 destructor

3
src/kx122/kx122.hpp
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@ -50,9 +50,10 @@ namespace upm{
@param bus I2C or SPI bus to use.
@param addr I2C address of the sensor.
@param chip_select Chip select pin for SPI.
@param spi_bus_frequency Speed of the SPI communication bus in Hz.
@throws std::runtime_error on initialization failure.
*/
KX122(int bus, int addr, int chip_select);
KX122(int bus, int addr, int chip_select, int spi_bus_frequency = DEFAULT_SPI_FREQUENCY);
/**
KX122 destructor