d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

aw_pwm: fix programming of the period

Browse Source 
The programmed value is biased by one: 0 means 1 cycle,
1 means 2 cycles, etc.

MFC after:	3 weeks
This commit is contained in:
Andriy Gapon 2020-09-25 07:40:26 +00:00
parent 1c2c602a17
commit fc1ec731c8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=366140
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/arm/allwinner/aw_pwm.c
View File

@ -293,7 +293,7 @@ aw_pwm_channel_config(device_t dev, u_int channel, u_int period, u_int duty)
AW_PWM_WRITE(sc, AW_PWM_CTRL, reg);
/* Write the total/active cycles */
reg = ((clk_rate / period_freq) << AW_PWM_PERIOD_TOTAL_SHIFT) |
reg = ((clk_rate / period_freq - 1) << AW_PWM_PERIOD_TOTAL_SHIFT) |
((clk_rate / duty_freq) << AW_PWM_PERIOD_ACTIVE_SHIFT);
AW_PWM_WRITE(sc, AW_PWM_PERIOD, reg);