diff options
Diffstat (limited to 'host/lib/usrp/e100/e100_iface.cpp')
| -rw-r--r-- | host/lib/usrp/e100/e100_iface.cpp | 138 |
1 files changed, 63 insertions, 75 deletions
diff --git a/host/lib/usrp/e100/e100_iface.cpp b/host/lib/usrp/e100/e100_iface.cpp index d61ef42ad..e44e438b0 100644 --- a/host/lib/usrp/e100/e100_iface.cpp +++ b/host/lib/usrp/e100/e100_iface.cpp @@ -34,6 +34,57 @@ using namespace uhd; using namespace uhd::usrp; /*********************************************************************** + * Sysfs GPIO wrapper class + **********************************************************************/ +class gpio{ +public: + gpio(const int num, const std::string &dir) : _num(num){ + this->set_xport("export"); + this->set_dir(dir); + _value_file.open(str(boost::format("/sys/class/gpio/gpio%d/value") % num).c_str(), std::ios_base::in | std::ios_base::out); + } + ~gpio(void){ + _value_file.close(); + this->set_dir("in"); + this->set_xport("unexport"); + } + void operator()(const int val){ + _value_file << val << std::endl << std::flush; + } + int operator()(void){ + std::string val; + std::getline(_value_file, val); + _value_file.seekg(0); + return int(val.at(0) - '0') & 0x1; + } +private: + void set_xport(const std::string &xport){ + std::ofstream export_file(("/sys/class/gpio/" + xport).c_str()); + export_file << _num << std::endl << std::flush; + export_file.close(); + } + void set_dir(const std::string &dir){ + std::ofstream dir_file(str(boost::format("/sys/class/gpio/gpio%d/direction") % _num).c_str()); + dir_file << dir << std::endl << std::flush; + dir_file.close(); + } + const int _num; + std::fstream _value_file; +}; + +//We only init the gpios when we have to use them (in the aux spi call). +//This way, the device discovery cannot unexport them from another process. +struct iface_gpios_type{ + typedef boost::shared_ptr<iface_gpios_type> sptr; + iface_gpios_type(void): + spi_sclk_gpio(65, "out"), + spi_sen_gpio(186, "out"), + spi_mosi_gpio(145, "out"), + spi_miso_gpio(147, "in"){} + gpio spi_sclk_gpio, spi_sen_gpio, spi_mosi_gpio, spi_miso_gpio; +}; + +/*********************************************************************** * I2C device node implementation wrapper **********************************************************************/ class i2c_dev_iface : public i2c_iface{ @@ -281,92 +332,29 @@ public: } boost::uint32_t bitbang_spi( - boost::uint32_t bits, - size_t num_bits, - bool readback + boost::uint32_t bits, size_t num_bits, bool readback ){ - boost::uint32_t rb_bits = 0; + if (_gpios.get() == NULL) { //init on demand... + _gpios = iface_gpios_type::sptr(new iface_gpios_type()); + } - _spi_bitbanger.spi_sen_gpio_write(0); + boost::uint32_t rb_bits = 0; + _gpios->spi_sen_gpio(0); for (size_t i = 0; i < num_bits; i++){ - _spi_bitbanger.spi_sclk_gpio_write(0); - _spi_bitbanger.spi_mosi_gpio_write((bits >> (num_bits-i-1)) & 0x1); + _gpios->spi_sclk_gpio(0); + _gpios->spi_mosi_gpio((bits >> (num_bits-i-1)) & 0x1); boost::this_thread::sleep(boost::posix_time::microseconds(10)); - if (readback) rb_bits = (rb_bits << 1) | _spi_bitbanger.spi_miso_gpio_read(); - _spi_bitbanger.spi_sclk_gpio_write(1); + if (readback) rb_bits = (rb_bits << 1) | _gpios->spi_miso_gpio(); + _gpios->spi_sclk_gpio(1); boost::this_thread::sleep(boost::posix_time::microseconds(10)); } - _spi_bitbanger.spi_sen_gpio_write(1); + _gpios->spi_sen_gpio(1); boost::this_thread::sleep(boost::posix_time::microseconds(100)); - return rb_bits; } - class bitbang_spi_guts{ - public: - bitbang_spi_guts(void){ - //setup gpio pin directions - this->set_gpio_direction(spi_sclk_gpio, "out"); - this->set_gpio_direction(spi_sen_gpio, "out"); - this->set_gpio_direction(spi_mosi_gpio, "out"); - this->set_gpio_direction(spi_miso_gpio, "in"); - - //open the gpio pin values - _spi_sclk_gpio_value.open(str(boost::format("/sys/class/gpio/gpio%d/value") % spi_sclk_gpio).c_str()); - _spi_sen_gpio_value.open(str(boost::format("/sys/class/gpio/gpio%d/value") % spi_sen_gpio).c_str()); - _spi_mosi_gpio_value.open(str(boost::format("/sys/class/gpio/gpio%d/value") % spi_mosi_gpio).c_str()); - _spi_miso_gpio_value.open(str(boost::format("/sys/class/gpio/gpio%d/value") % spi_miso_gpio).c_str()); - } - - ~bitbang_spi_guts(void){ - this->set_gpio_direction(spi_sclk_gpio, "in"); - this->set_gpio_direction(spi_sen_gpio, "in"); - this->set_gpio_direction(spi_mosi_gpio, "in"); - } - - void spi_sclk_gpio_write(int val){ - _spi_sclk_gpio_value << val << std::endl << std::flush; - } - - void spi_sen_gpio_write(int val){ - _spi_sen_gpio_value << val << std::endl << std::flush; - } - - void spi_mosi_gpio_write(int val){ - _spi_mosi_gpio_value << val << std::endl << std::flush; - } - - int spi_miso_gpio_read(void){ - std::string val; - std::getline(_spi_miso_gpio_value, val); - _spi_miso_gpio_value.seekg(0); - return int(val.at(0) - '0') & 0x1; - } - - private: - enum{ - spi_sclk_gpio = 65, - spi_sen_gpio = 186, - spi_mosi_gpio = 145, - spi_miso_gpio = 147, - }; - - void set_gpio_direction(int gpio_num, const std::string &dir){ - std::ofstream export_file("/sys/class/gpio/export"); - export_file << gpio_num << std::endl << std::flush; - export_file.close(); - - std::ofstream dir_file(str(boost::format("/sys/class/gpio/gpio%d/direction") % gpio_num).c_str()); - dir_file << dir << std::endl << std::flush; - dir_file.close(); - } - - std::ofstream _spi_sclk_gpio_value, _spi_sen_gpio_value, _spi_mosi_gpio_value; - std::ifstream _spi_miso_gpio_value; - }; - /******************************************************************* * UART ******************************************************************/ @@ -382,7 +370,7 @@ private: int _node_fd; i2c_dev_iface _i2c_dev_iface; boost::mutex _ctrl_mutex; - bitbang_spi_guts _spi_bitbanger; + iface_gpios_type::sptr _gpios; }; /*********************************************************************** |