esp-idf/docs/_static/diagrams/spi/spi_master_freq_tv.plt
michael 58955a79a2 spi_slave: improve the timing configuration
SPI Slave
===========

- Correct the configuration of mode 0~3 using new config in the TRM
- Split the workaround for DMA in mode 0/2 out of normal config, to make it clear.
- Update timing and speed document for the SPI slave.

Resolves https://github.com/espressif/esp-idf/issues/1346, https://github.com/espressif/esp-idf/issues/2393
2019-01-26 00:10:41 +08:00

34 lines
1.1 KiB
Gnuplot

# this is a GNUPLOT script generating the figure of spi_master_freq_tv.png
set xlabel "Input delay (ns)"
set xrange [0: 125]
set ylabel "Fmax (MHz)"
set yrange [0: 81]
set xtics 12.5 textcolor rgb "black"
set ytics 10 textcolor rgb "black"
set border 3 lc rgb "gray" lw 2
set grid lt -1 lc rgb "gray" lw 2
set samples 10000
set terminal png size 700,500
set output "plot.png"
apb = 12.5
#each line is broken into 10 pieces by the range determined by i
f1(i,x) = (x>= i*apb) && (x < (i+1)*apb) ? 80./(i+1) : 1/0
set style circle radius graph 0.008
#solid and empty circles are draw by the coordinates given in the csv
plot [0:125]\
f1(-1, x) lw 3lc rgb "blue" title "IOMUX",\
for [i=0:9] f1(i, x) with lines lw 3 lc rgb "blue" notitle,\
f1(0, x+25) lw 3 lc rgb "red" title "GPIO",\
for [i=2:11] f1(i, x+25) with lines lw 3 lc rgb "red" notitle, \
"tv.csv" using 1:2 with circles notitle fill solid fc rgb "blue", \
"tv.csv" using 1:4 with circles notitle fc rgb "blue",\
"tv.csv" using 1:3 with circles notitle fill solid fc rgb "red" ,\
"tv.csv" using 1:5 with circles notitle fc rgb "red"