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Diffstat (limited to 'drivers/gaudio/pwm/readme.txt')
| -rw-r--r-- | drivers/gaudio/pwm/readme.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gaudio/pwm/readme.txt b/drivers/gaudio/pwm/readme.txt new file mode 100644 index 00000000..1dd3ed9a --- /dev/null +++ b/drivers/gaudio/pwm/readme.txt @@ -0,0 +1,12 @@ +This driver uses a PWM output and a timer to implement an audio play channel. + +Whilst the default config settings will probably work for your hardware, you may need to change them. +If so copy gaudio_play_config.h to your project directory and then alter it. + +The maximum sample frequency is governed primarily by the number of bits of resolution and the +maximum PWM clock rate. The maximum sample frequency should be less than... + + Max PWM Clock / (2 ^ Bits per sample) + +eg. For the AT91SAM7 max PWM clock = 48MHz / 2 + For 10 bit PWM accuracy that means GAUDIO_PLAY_MAX_SAMPLE_FREQUENCY = 23,437 Hz |