lv_chart_set_axis_tick() function
Set the number of tick lines on an axis
Arguments
obj
pointer to a chart object
axis
an axis which ticks count should be set
major_len
length of major ticks
minor_len
length of minor ticks
major_cnt
number of major ticks on the axis
minor_cnt
number of minor ticks between two major ticks
label_en
true: enable label drawing on major ticks
draw_size
extra size required to draw the tick and labels (start with 20 px and increase if the ticks/labels are clipped)