| |
|---|
| | * |
|---|
| | * Arduino internally uses the 'wiring' library, but experiments have shown |
|---|
| | * that it is really slow. |
|---|
| | * |
|---|
| | * (see blog by skpang) |
|---|
| | * See 'Faster IO on the Arduino' on the SKPang blog: |
|---|
| | * http://skpang.co.uk/blog/archives/323 |
|---|
| | * |
|---|
| | * So this module uses direct register writes, and provides a placeholder for |
|---|
| | * compile-time selection of bitmasks and bitpatterns to support more Arduino |
|---|
| | * boards in the future. |
|---|
| |
|---|
| | /***** VARIABLES *****/ |
|---|
| | |
|---|
| | /****** MACROS *****/ |
|---|
| | |
|---|
| | //#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3)) |
|---|
| | //#define OUT_GPIO(g) *(gpio+((g)/10)) |= (1<<(((g)%10)*3)) |
|---|
| | //#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3)) |
|---|
| | //#define INP_GPIO(g) |
|---|
| | //#define OUT_GPIO(g) |
|---|
| | |
|---|
| | //#define GPIO_SET *(gpio+7) // sets bits which are 1 ignores bits which are 0 |
|---|
| | //#define GPIO_CLR *(gpio+10) // clears bits which are 1 ignores bits which are 0 |
|---|
| | //#define GPIO_SET |
|---|
| | //#define GPIO_CLR |
|---|
| | |
|---|
| | //#define GPIO_READ(g) ((*(gpio+13)&(1<<g)) != 0) |
|---|
| | //#define GPIO_READ(g) |
|---|
| | |
|---|
| | //#define GPIO_HIGH(g) GPIO_SET = (1<<(g)) |
|---|
| | //#define GPIO_LOW(g) GPIO_CLR = (1<<(g)) |
|---|
| | //#define GPIO_HIGH(g) |
|---|
| | //#define GPIO_LOW(g) |
|---|
| | |
|---|
| | |
|---|
| | void gpio_init() |
|---|
| | { |
|---|
| |
|---|
| | |
David Whale
authored
on 4 Apr 2016