From b92d401f2b026eaf4734f7d2cc66b62a810985be Mon Sep 17 00:00:00 2001 From: Florian Agbuya Date: Fri, 28 Jun 2024 11:59:23 +0800 Subject: [PATCH] pyfastservo: fix dac init script and cleanup --- fast-servo/pyfastservo/dac.py | 188 ++++++++++++++-------------------- 1 file changed, 77 insertions(+), 111 deletions(-) diff --git a/fast-servo/pyfastservo/dac.py b/fast-servo/pyfastservo/dac.py index a523ffc..4de7240 100644 --- a/fast-servo/pyfastservo/dac.py +++ b/fast-servo/pyfastservo/dac.py @@ -17,8 +17,7 @@ # You should have received a copy of the GNU General Public License # along with this program. If not, see . -import mmap -import os +import time import spidev from pyfastservo.common import ( @@ -29,108 +28,58 @@ from pyfastservo.common import ( CTRL_ADDR, MAP_MASK, PAGESIZE, + write_to_memory, + read_from_memory ) # /dev/spidev2.0 <=> spidev. MAIN_DAC_BUS = 2 MAIN_DAC_DEVICE = 0 - DAC_VERSION = 0x0A -def main_dac_init(): - spi = spidev.SpiDev() +def spi_write(spi, address, value): + spi.xfer2([address, value]) - try: - spi.open(MAIN_DAC_BUS, MAIN_DAC_DEVICE) - spi.max_speed_hz = 5000 - spi.mode = 0b00 # CPOL = 0 CPHA = 0 - spi.cshigh = False +def spi_read(spi, address): + rx_buffer = spi.xfer2([0x80 | address, 0x00]) + return rx_buffer[1] - spi_buffer = [0x00, 0x10] # software reset - spi.xfer2(spi_buffer) +def hard_reset(spi): + spi_write(spi, 0x00, 0x10) # Software reset + spi_write(spi, 0x00, 0x00) # Release software reset + spi_read(spi, 0x00) # Read reset address (necessary for reset to take effect) - spi_buffer = [0x00, 0x00] # release software reset - spi.xfer2(spi_buffer) +def check_version(spi): + version = spi_read(spi, 0x1F) + print(f"DAC version: 0x{version:02X}") + return version == DAC_VERSION - spi_buffer = [ - 0x80, - 0x00, - ] # for some reason it is needed to read the reset address for reset to actually reset - rx_buffer = spi.xfer2(spi_buffer) +def configure_dac(spi): + power_down_reg = spi_read(spi, 0x01) + spi_write(spi, 0x01, power_down_reg & ~(1 << 0)) # Clear EXTREF bit for internal reference + spi_write(spi, 0x0D, 0x00) # Set RREF to 10 kΩ for 1.0V reference + spi_write(spi, 0x04, 0xA0) # Enable on-chip IRSET (1.6 kΩ for 20mA output) + spi_write(spi, 0x07, 0xA0) # Enable on-chip QRSET (1.6 kΩ for 20mA output) + spi_write(spi, 0x05, 0x00) # Disable internal IRCML + spi_write(spi, 0x08, 0x00) # Disable internal QRCML + spi_write(spi, 0x02, 0xB4) # Enable 2's complement, LVDS interface, 4 LVDS lanes - spi_buffer = [0x9F, 0x00] # hardware version - rx_buffer = spi.xfer2(spi_buffer) - if rx_buffer[1] != DAC_VERSION: - print(f"Unrecognized device: 0x{rx_buffer[1]:02X}") +def dac_self_calibration(spi): + spi_write(spi, 0x12, 0x00) # Reset calibration status + spi_write(spi, 0x0E, 0x08) # Enable calibration clock, default divide ratio + spi_write(spi, 0x0E, 0x38) # CALSELI = 1, CALSELQ = 1, CALCLK = 1 + spi_write(spi, 0x12, 0x10) # Set CALEN bit - print("=== Contents of spi buffer after DAC VERSION read back: ===") - print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}") - - spi_buffer = [0x82, 00] - rx_buffer = spi.xfer2(spi_buffer) - print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}") - - # set to 2's complement and I to be first of pair on data input pads - spi_buffer = [0x02, 0xB4] - rx_buffer = spi.xfer2(spi_buffer) - spi_buffer = [0x82, 00] - rx_buffer = spi.xfer2(spi_buffer) - print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}") - - for i in range(10): - spi_buffer = [0x94, 0x00] - rx_buffer = spi.xfer2(spi_buffer) - print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}") - - finally: - spi.close() - - -def read_from_memory(address, n_bytes): - assert n_bytes <= 4 - addr = address - - try: - f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR) - with mmap.mmap( - f, - PAGESIZE, - mmap.MAP_SHARED, - mmap.PROT_READ | mmap.PROT_WRITE, - offset=addr & ~MAP_MASK, - ) as mem: - start_addr = addr & MAP_MASK - stop_addr = start_addr + 4 - # print(f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}") - contents = mem[start_addr:stop_addr] - read_value = list(contents)[:n_bytes] - finally: - os.close(f) - - return read_value - - -def write_to_memory(address, value): - value_bytes = value.to_bytes(4, "little") - addr = address - - try: - f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR) - with mmap.mmap( - f, - PAGESIZE, - mmap.MAP_SHARED, - mmap.PROT_READ | mmap.PROT_WRITE, - offset=addr & ~MAP_MASK, - ) as mem: - start_addr = addr & MAP_MASK - stop_addr = start_addr + 4 - mem[start_addr:stop_addr] = value_bytes - contents = mem[start_addr:stop_addr] - finally: - os.close(f) + while True: + status = spi_read(spi, 0x0F) + if status & 0xC0 == 0xC0: # Both CALSTATI and CALSTATQ are 1 + break + time.sleep(0.01) + spi_write(spi, 0x12, 0x00) # Clear calibration bits + spi_write(spi, 0x0E, 0x30) # Keep CALSELI and CALSELQ set, clear CALCLK + print("DAC self-calibration completed") def manual_override(enable=True): reg_contents = read_from_memory(CTRL_ADDR, 1)[0] @@ -138,7 +87,6 @@ def manual_override(enable=True): to_write = reg_contents | 0b1 if enable else reg_contents & 0b110 write_to_memory(CTRL_ADDR, to_write) - def power_down(channel, power_down=True): assert channel in (0, 1) @@ -152,31 +100,49 @@ def power_down(channel, power_down=True): reg_contents = read_from_memory(CTRL_ADDR, 1)[0] print(f"REG contents: 0b{reg_contents:03b}") +def set_dac_output(value): + value = min(value, 0x3FFF) + low_word = value & 0xFF + high_word = (value >> 8) & 0x3F -def write_sample(channel, sample): - assert channel in (0, 1) - if channel == 0: - addresses = [CH0_HIGH_WORD_ADDR, CH0_LOW_WORD_ADDR] - else: - addresses = [CH1_HIGH_WORD_ADDR, CH1_LOW_WORD_ADDR] + write_to_memory(CH0_HIGH_WORD_ADDR, high_word) + write_to_memory(CH0_LOW_WORD_ADDR, low_word) + write_to_memory(CH1_HIGH_WORD_ADDR, high_word) + write_to_memory(CH1_LOW_WORD_ADDR, low_word) + print(f"DAC output set to: 0x{value:04X}") - low_word_value = sample & 0xFF - high_word_value = (sample >> 8) & 0x3F - values = [high_word_value, low_word_value] - for addr, value in zip(addresses, values): - write_to_memory(addr, value) +def configure_ad9117(): + spi = spidev.SpiDev() + spi.open(MAIN_DAC_BUS, MAIN_DAC_DEVICE) + spi.max_speed_hz = 5000 + spi.mode = 0b00 # CPOL = 0 CPHA = 0 + spi.cshigh = False + try: + hard_reset(spi) + if not check_version(spi): + print("Unrecognized DAC version") + return False -def write_ramp(): - signal = [i for i in range(16384)] + configure_dac(spi) + dac_self_calibration(spi) - for value in signal: - write_sample(0, value) + power_down(0, False) + power_down(1, False) + manual_override(True) + + # Enable DAC outputs + spi_write(spi, 0x01, spi_read(spi, 0x01) & ~((1 << 4) | (1 << 3))) + + print("AD9117 configuration completed successfully") + return True + + except Exception as e: + print(f"Error configuring AD9117: {e}") + return False + + finally: + spi.close() -def main(): - main_dac_init() - power_down(0, False) - power_down(1, False) - if __name__ == "__main__": - main() \ No newline at end of file + configure_ad9117() \ No newline at end of file