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Merge pull request #1148 from devsaurus/gpio_opendrain 

Add support for GPIO open-drain output mode.
This commit is contained in:
Terry Ellison 2016-03-17 00:17:33 +00:00
parent 2820d98222 23137b4ed1
commit 30f2c5ca1c
4 changed files with 30 additions and 16 deletions
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4
app/modules/gpio.c
View File

@ -12,6 +12,7 @@
#define PULLUP PLATFORM_GPIO_PULLUP
#define FLOAT PLATFORM_GPIO_FLOAT
#define OUTPUT PLATFORM_GPIO_OUTPUT
#define OPENDRAIN PLATFORM_GPIO_OPENDRAIN
#define INPUT PLATFORM_GPIO_INPUT
#define INTERRUPT PLATFORM_GPIO_INT
#define HIGH PLATFORM_GPIO_HIGH
@ -93,7 +94,7 @@ static int lgpio_mode( lua_State* L )
unsigned pullup = luaL_optinteger( L, 3, FLOAT );
luaL_argcheck(L, platform_gpio_exists(pin) && (mode!=INTERRUPT || pin>0), 1, "Invalid pin");
luaL_argcheck(L, mode==OUTPUT || mode==INPUT
luaL_argcheck(L, mode==OUTPUT || mode==OPENDRAIN || mode==INPUT
#ifdef GPIO_INTERRUPT_ENABLE
|| mode==INTERRUPT
#endif
@ -204,6 +205,7 @@ static const LUA_REG_TYPE gpio_map[] = {
{ LSTRKEY( "INT" ), LNUMVAL( INTERRUPT ) },
#endif
{ LSTRKEY( "OUTPUT" ), LNUMVAL( OUTPUT ) },
{ LSTRKEY( "OPENDRAIN" ), LNUMVAL( OPENDRAIN ) },
{ LSTRKEY( "INPUT" ), LNUMVAL( INPUT ) },
{ LSTRKEY( "HIGH" ), LNUMVAL( HIGH ) },
{ LSTRKEY( "LOW" ), LNUMVAL( LOW ) },

15
app/platform/platform.c
View File

@ -60,7 +60,7 @@ uint8_t platform_key_led( uint8_t level){
/*
* Set GPIO mode to output. Optionally in RAM helper because interrupts are dsabled
*/
static void NO_INTR_CODE set_gpio_no_interrupt(uint8 pin) {
static void NO_INTR_CODE set_gpio_no_interrupt(uint8 pin, uint8_t push_pull) {
unsigned pnum = pin_num[pin];
ETS_GPIO_INTR_DISABLE();
#ifdef GPIO_INTERRUPT_ENABLE
@ -71,9 +71,17 @@ static void NO_INTR_CODE set_gpio_no_interrupt(uint8 pin) {
gpio_pin_intr_state_set(GPIO_ID_PIN(pnum), GPIO_PIN_INTR_DISABLE);
//clear interrupt status
GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, BIT(pnum));
// configure push-pull vs open-drain
if (push_pull) {
GPIO_REG_WRITE(GPIO_PIN_ADDR(GPIO_ID_PIN(pnum)),
GPIO_REG_READ(GPIO_PIN_ADDR(GPIO_ID_PIN(pnum))) &
(~ GPIO_PIN_PAD_DRIVER_SET(GPIO_PAD_DRIVER_ENABLE))); //disable open drain;
} else {
GPIO_REG_WRITE(GPIO_PIN_ADDR(GPIO_ID_PIN(pnum)),
GPIO_REG_READ(GPIO_PIN_ADDR(GPIO_ID_PIN(pnum))) |
GPIO_PIN_PAD_DRIVER_SET(GPIO_PAD_DRIVER_ENABLE)); //enable open drain;
}
ETS_GPIO_INTR_ENABLE();
}
@ -124,7 +132,10 @@ int platform_gpio_mode( unsigned pin, unsigned mode, unsigned pull )
GPIO_DIS_OUTPUT(pin_num[pin]);
/* run on */
case PLATFORM_GPIO_OUTPUT:
set_gpio_no_interrupt(pin);
set_gpio_no_interrupt(pin, TRUE);
break;
case PLATFORM_GPIO_OPENDRAIN:
set_gpio_no_interrupt(pin, FALSE);
break;
#ifdef GPIO_INTERRUPT_ENABLE

1
app/platform/platform.h
View File

@ -32,6 +32,7 @@ uint8_t platform_key_led( uint8_t level);
#define PLATFORM_GPIO_INT 2
#define PLATFORM_GPIO_OUTPUT 1
#define PLATFORM_GPIO_OPENDRAIN 3
#define PLATFORM_GPIO_INPUT 0
#define PLATFORM_GPIO_HIGH 1

8
docs/en/modules/gpio.md
View File

@ -20,20 +20,20 @@ If not using a NodeMCU dev kit, please refer to the below GPIO pin maps for the
| 5 | GPIO14 | 12 | GPIO10 |
| 6 | GPIO12 | | |
** [*] D0(GPIO16) can only be used as gpio read/write. No interrupt support. No pwm/i2c/ow support. **
** [*] D0(GPIO16) can only be used as gpio read/write. No support for open-drain/interrupt/pwm/i2c/ow. **
## gpio.mode()
Initialize pin to GPIO mode, set the pin in/out direction, and optional internal pullup.
Initialize pin to GPIO mode, set the pin in/out direction, and optional internal weak pull-up.
#### Syntax
`gpio.mode(pin, mode [, pullup])`
#### Parameters
- `pin` pin to configure, IO index
- `mode` one of gpio.OUTPUT or gpio.INPUT, or gpio.INT(interrupt mode)
- `pullup` gpio.PULLUP or gpio.FLOAT; default is gpio.FLOAT
- `mode` one of gpio.OUTPUT, gpio.OPENDRAIN, gpio.INPUT, or gpio.INT (interrupt mode)
- `pullup` gpio.PULLUP enables the weak pull-up resistor; default is gpio.FLOAT
#### Returns
`nil`