diff options
| -rw-r--r-- | host/lib/usrp/usrp_e100/usrp_e100_iface.cpp | 103 |
1 files changed, 100 insertions, 3 deletions
diff --git a/host/lib/usrp/usrp_e100/usrp_e100_iface.cpp b/host/lib/usrp/usrp_e100/usrp_e100_iface.cpp index 55446da63..a1a6cdb85 100644 --- a/host/lib/usrp/usrp_e100/usrp_e100_iface.cpp +++ b/host/lib/usrp/usrp_e100/usrp_e100_iface.cpp @@ -21,11 +21,13 @@ #include <sys/ioctl.h> //ioctl #include <fcntl.h> //open, close #include <linux/usrp_e.h> //ioctl structures and constants +#include <boost/thread/thread.hpp> //sleep #include <boost/format.hpp> #include <boost/thread/mutex.hpp> #include <linux/i2c-dev.h> #include <linux/i2c.h> -#include <stdexcept> +#include <iostream> +#include <fstream> using namespace uhd; using namespace uhd::usrp; @@ -245,6 +247,10 @@ public: size_t num_bits, bool readback ){ + if (which_slave == UE_SPI_SS_AD9522) return bitbang_spi( + bits, num_bits, readback + ); + //load data struct usrp_e_spi data; data.readback = (readback)? UE_SPI_TXRX : UE_SPI_TXONLY; @@ -263,11 +269,101 @@ public: //unload the data return data.data; } - + + boost::uint32_t bitbang_spi( + boost::uint32_t bits, + size_t num_bits, + bool readback + ){ + boost::uint32_t rb_bits = 0; + + _spi_bitbanger.spi_sen_gpio_write(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); + 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); + boost::this_thread::sleep(boost::posix_time::microseconds(10)); + } + + _spi_bitbanger.spi_sen_gpio_write(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 + ******************************************************************/ void write_uart(boost::uint8_t, const std::string &) { throw uhd::not_implemented_error("Unhandled command write_uart()"); } - + std::string read_uart(boost::uint8_t) { throw uhd::not_implemented_error("Unhandled command read_uart()"); } @@ -276,6 +372,7 @@ private: int _node_fd; i2c_dev_iface _i2c_dev_iface; boost::mutex _ctrl_mutex; + bitbang_spi_guts _spi_bitbanger; }; /*********************************************************************** |