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Raspberry Pi C Library
define them like this and we will not forget to call INP_GPIO:
Hi there!
I tend to forget things... so why not wrap the INP_GPIO macro inside the OUT_GPIO and SET_GPIO_ALT ones? Like so:
#define OUT_GPIO(g) do { \
INP_GPIO(g); \
*(gpio.addr + ((g)/10)) |= (1<<(((g)%10)*3)); \
} while(0)
#define SET_GPIO_ALT(g,a) do { \
INP_GPIO(g); \
*(gpio.addr + (((g)/10))) |= (((a)<=3?(a) + 4:(a)==4?3:2)<<(((g)%10)*3)); \
} while(0)
Also helps to get cleaner code. Tested on my rpi and works great ;)
should be
otherwise, consider the following code:
if (GPIO_READ(echo) != 0) {
}
the operator "&=" has very low prority, even lower than "!=".
Hello.
I tried to use GPIO28 and GPIO29 as I2C.
So, I used SET_GPIO_ALT(28, 0) and SET_GPIO_ALT(29, 0) after INP_GPIO(28) and INP_GPIO(29), respectively.
But, my code, which worked fine with I2C-1, doesn't work with that command.
GPIO28, GPIO29 pins are not woking in I2C mode.
I looked through the bcm2385 library and it looks all the parts related to GPIO setting is the same.
Any idea?
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