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fix bug bit time calculation

This commit is contained in:
M0stafaRady 2022-10-01 02:53:24 -07:00
parent 68c88b116a
commit 9615629a42
1 changed files with 25 additions and 22 deletions
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47
verilog/dv/cocotb/tests/uart/uart.py
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@ -10,24 +10,25 @@ from tests.common_functions.test_functions import *
from tests.bitbang.bitbang_functions import * from tests.bitbang.bitbang_functions import *
from caravel import GPIO_MODE from caravel import GPIO_MODE
baud_rate = 9600
number_of_bits = 8 bit_time_ns = 0
bit_rate_ns = round((10**9)/(baud_rate*number_of_bits) )
clk = 12.5
bit_time = 10**5 * clk / (96)
reg = Regs() reg = Regs()
@cocotb.test() @cocotb.test()
@repot_test @repot_test
async def uart_tx(dut): async def uart_tx(dut):
caravelEnv = await test_configure(dut,timeout_cycles=18613481) caravelEnv,clock = await test_configure(dut,timeout_cycles=18613481)
cpu = RiskV(dut) cpu = RiskV(dut)
cpu.cpu_force_reset() cpu.cpu_force_reset()
cpu.cpu_release_reset() cpu.cpu_release_reset()
cocotb.log.info(f"[TEST] Start uart test") cocotb.log.info(f"[TEST] Start uart test")
expected_msg = "Monitor: Test UART (RTL) passed" expected_msg = "Monitor: Test UART (RTL) passed"
# calculate bit time
clk = clock.period/1000
global bit_time_ns
bit_time_ns = round(10**5 * clk / (96))
# wait for start of sending
await wait_reg1(cpu,caravelEnv,0XAA) await wait_reg1(cpu,caravelEnv,0XAA)
cocotb.log.info (f"[TEST] start receiving from uart") cocotb.log.info (f"[TEST] start receiving from uart")
@ -46,27 +47,31 @@ async def uart_tx(dut):
# if temp != caravelEnv.monitor_gpio((6,6)) # if temp != caravelEnv.monitor_gpio((6,6))
char = caravelEnv.monitor_gpio((6,6)).binstr + char char = caravelEnv.monitor_gpio((6,6)).binstr + char
cocotb.log.debug (f"[TEST] bit[{counter}] = {caravelEnv.monitor_gpio((6,6))} data out = {char} ") cocotb.log.debug (f"[TEST] bit[{counter}] = {caravelEnv.monitor_gpio((6,6))} data out = {char} ")
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
counter +=1 counter +=1
async def start_of_tx(caravelEnv): async def start_of_tx(caravelEnv):
while (True): # wait for the start of the transimission it 1 then 0 while (True): # wait for the start of the transimission it 1 then 0
if (caravelEnv.monitor_gpio((6,6)).integer == 0): if (caravelEnv.monitor_gpio((6,6)).integer == 0):
break break
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
@cocotb.test() @cocotb.test()
@repot_test @repot_test
async def uart_rx(dut): async def uart_rx(dut):
caravelEnv = await test_configure(dut,timeout_cycles=95844) caravelEnv,clock = await test_configure(dut,timeout_cycles=95844)
cpu = RiskV(dut) cpu = RiskV(dut)
cpu.cpu_force_reset() cpu.cpu_force_reset()
cpu.cpu_release_reset() cpu.cpu_release_reset()
cocotb.log.info(f"[TEST] Start uart test") cocotb.log.info(f"[TEST] Start uart test")
caravelEnv.drive_gpio_in((5,5),1) caravelEnv.drive_gpio_in((5,5),1)
# calculate bit time
clk = clock.period/1000
global bit_time_ns
bit_time_ns = round(10**5 * clk / (96))
print (clk)
# send first char # send first char
await wait_reg1(cpu,caravelEnv,0XAA) await wait_reg1(cpu,caravelEnv,0XAA)
await uart_send_char(caravelEnv,"B") await uart_send_char(caravelEnv,"B")
@ -76,9 +81,7 @@ async def uart_rx(dut):
await uart_send_char(caravelEnv,"M") await uart_send_char(caravelEnv,"M")
await uart_check_char_recieved(caravelEnv,cpu) await uart_check_char_recieved(caravelEnv,cpu)
# send third char # send third char
cocotb.log.info(f"[TEST] here")
await wait_reg1(cpu,caravelEnv,0XCC) await wait_reg1(cpu,caravelEnv,0XCC)
cocotb.log.info(f"[TEST] here")
await uart_send_char(caravelEnv,"A") await uart_send_char(caravelEnv,"A")
await uart_check_char_recieved(caravelEnv,cpu) await uart_check_char_recieved(caravelEnv,cpu)
@ -89,21 +92,21 @@ async def uart_send_char(caravelEnv,char):
cocotb.log.info (f"[TEST] start sending on uart {char}") cocotb.log.info (f"[TEST] start sending on uart {char}")
#send start bit #send start bit
caravelEnv.drive_gpio_in((5,5),0) caravelEnv.drive_gpio_in((5,5),0)
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
#send bits #send bits
for i in range(8): for i in range(8):
caravelEnv.drive_gpio_in((5,5),char_bits[i]) caravelEnv.drive_gpio_in((5,5),char_bits[i])
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
# stop of frame # stop of frame
caravelEnv.drive_gpio_in((5,5),1) caravelEnv.drive_gpio_in((5,5),1)
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
# insert 4 bit delay just for debugging # insert 4 bit delay just for debugging
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
await Timer(bit_rate_ns, units='ns') await Timer(bit_time_ns, units='ns')
async def uart_check_char_recieved(caravelEnv,cpu): async def uart_check_char_recieved(caravelEnv,cpu):