Hi,
I'm having problems controlling the GPIO pins on a BT878 for output. I'm
measuring the voltage on the GPIO pins and they all remain at 5V ( /0 ).
Are my btwrites() ok????
I've added "audio_hook=external_muxsel" the card entry in struct
bttv_tvcards and this is the external_muxsel():
/* from bttv-cards.c */
static void external_muxsel(struct bttv *btv, struct video_audio *v, int set){
/* read current GPIO status and print it */
bttv_gpio_tracking(btv,"pre:external_muxsel");
/* process GPIO stuff */
/* NOTE: GPIO_OUT_EN is the output mask register,output=~mask&data */
/* NOTE: GPIO_DATA is the 24bit input/ouput register */
btwrite(0x7fff,BT848_GPIO_OUT_EN); // disable all outputs
btwrite(0x0000,BT848_GPIO_OUT_EN); // enable all outputs
btwrite(0x0000,BT848_GPIO_DATA); // set all outputs to /0 (+5V)
btwrite(0x7fff,BT848_GPIO_DATA); // set all outputs to /1 (0V)
/* read current GPIO status and print it */
bttv_gpio_tracking(btv,"post:external_muxsel");
}
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