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//
// Copyright 2017 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <mpm/exception.hpp>
#include <mpm/spi/spi_iface.hpp>
#include <mpm/spi/spi_regs_iface.hpp>
#include <mpm/types/regs_iface.hpp>
using mpm::types::regs_iface;
/*! SPI implementation of the regs iface
*
* Uses spidev
*/
class spi_regs_iface_impl : public regs_iface
{
public:
spi_regs_iface_impl(mpm::spi::spi_iface::sptr spi_iface,
uint32_t addr_shift,
uint32_t data_shift,
uint64_t read_flags,
uint64_t write_flags = 0)
: _spi_iface(spi_iface)
, _addr_shift(addr_shift)
, _data_shift(data_shift)
, _read_flags(read_flags)
, _write_flags(write_flags)
{
/* nop */
}
uint8_t peek8(const uint32_t addr)
{
uint32_t transaction = 0 | (addr << _addr_shift) | _read_flags;
uint32_t data = _spi_iface->transfer24_8(transaction);
if ((data & 0xFFFFFF00) != 0) {
throw mpm::runtime_error("SPI read returned too much data");
}
return data;
}
void poke8(const uint32_t addr, const uint8_t data)
{
uint32_t transaction = 0 | _write_flags | (addr << _addr_shift)
| (data << _data_shift);
_spi_iface->transfer24_8(transaction);
}
uint16_t peek16(const uint32_t addr)
{
uint32_t transaction = 0 | (addr << _addr_shift) | _read_flags;
uint32_t data = _spi_iface->transfer24_16(transaction);
if ((data & 0xFFFF0000) != 0) {
throw mpm::runtime_error("SPI read returned too much data");
}
return data;
}
void poke16(const uint32_t addr, const uint16_t data)
{
uint32_t transaction = 0 | _write_flags | (addr << _addr_shift)
| (data << _data_shift);
_spi_iface->transfer24_16(transaction);
}
uint32_t peek32(const uint64_t addr)
{
/* Note: _addr_shift and _read_flags will be offset from the
* TX portion of the message (first 2 bytes) rather than the
* end of the message as is done with smaller transfers.
*/
uint64_t transaction = 0 | (addr << _addr_shift) | _read_flags;
uint64_t data = _spi_iface->transfer64_40(transaction);
// Actual RX data is the last 5 bytes
if ((data & 0xFFFFFF00000000F8) != 0) {
throw mpm::runtime_error("SPI read returned too much data");
}
// Status data is the last byte
bool ack = (data >> 2) & 0x1;
uint8_t status = data & 0x3;
if (!ack) {
throw mpm::runtime_error("Ctrlport SPI read had no ACK");
}
if (status != 0) {
// TODO: Differentiate error codes
throw mpm::runtime_error("Ctrlport SPI error");
}
// Register data is the 4 bytes above the last one
data = (data >> 8) & 0xFFFFFFFF;
return data;
}
void poke32(const uint64_t addr, const uint32_t data)
{
/* Note: _addr_shift and _write_flags will be offset from the
* TX portion of the message (first 6 bytes) rather than the
* end of the message as is done with smaller transfers.
*/
uint64_t transaction = 0 | _write_flags | (addr << _addr_shift)
| (data << _data_shift);
_spi_iface->transfer64_40(transaction);
}
private:
mpm::spi::spi_iface::sptr _spi_iface;
uint32_t _addr_shift;
uint32_t _data_shift;
uint64_t _read_flags;
uint64_t _write_flags;
};
regs_iface::sptr mpm::spi::make_spi_regs_iface(mpm::spi::spi_iface::sptr spi_iface,
uint32_t addr_shift,
uint32_t data_shift,
uint64_t read_flags,
uint64_t write_flags)
{
return std::make_shared<spi_regs_iface_impl>(
spi_iface, addr_shift, data_shift, read_flags, write_flags);
}
mpm::types::regs_iface::sptr mpm::spi::make_spidev_regs_iface(const std::string& device,
const int speed_hz,
const int spi_mode,
uint32_t addr_shift,
uint32_t data_shift,
uint64_t read_flags,
uint64_t write_flags)
{
auto spi_iface_sptr = mpm::spi::spi_iface::make_spidev(device, speed_hz, spi_mode);
return std::make_shared<spi_regs_iface_impl>(
spi_iface_sptr, addr_shift, data_shift, read_flags, write_flags);
}
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