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drivers/hd44780: PCF857x I2C interface added

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This commit is contained in:
Gunar Schorcht 2019-11-07 17:30:46 +01:00
parent 0646862421
commit 74afd3b365
2 changed files with 93 additions and 14 deletions
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76
drivers/hd44780/hd44780.c
View File

@ -23,17 +23,30 @@
#include <string.h>
#include "log.h"
#ifdef MODULE_PCF857X
#include "pcf857x.h"
#include "pcf857x_params.h"
#else
#include "periph/gpio.h"
#endif
#include "xtimer.h"
#include "hd44780.h"
#include "hd44780_internal.h"
#ifdef MODULE_PCF857X
static pcf857x_t _pcf857x_dev;
#endif
static inline void _command(const hd44780_t *dev, uint8_t value);
static void _pulse(const hd44780_t *dev);
static void _send(const hd44780_t *dev, uint8_t value, hd44780_state_t state);
static void _write_bits(const hd44780_t *dev, uint8_t bits, uint8_t value);
static inline void _gpio_set(gpio_t pin);
static inline void _gpio_clear(gpio_t pin);
static inline int _gpio_init(gpio_t pin, gpio_mode_t mode);
/**
* @brief Send a command to the display
*
@ -52,11 +65,11 @@ static inline void _command(const hd44780_t *dev, uint8_t value)
*/
static void _pulse(const hd44780_t *dev)
{
gpio_clear(dev->p.enable);
_gpio_clear(dev->p.enable);
xtimer_usleep(HD44780_PULSE_WAIT_SHORT);
gpio_set(dev->p.enable);
_gpio_set(dev->p.enable);
xtimer_usleep(HD44780_PULSE_WAIT_SHORT);
gpio_clear(dev->p.enable);
_gpio_clear(dev->p.enable);
xtimer_usleep(HD44780_PULSE_WAIT_LONG);
}
@ -69,10 +82,10 @@ static void _pulse(const hd44780_t *dev)
*/
static void _send(const hd44780_t *dev, uint8_t value, hd44780_state_t state)
{
(state == HD44780_ON) ? gpio_set(dev->p.rs) : gpio_clear(dev->p.rs);
(state == HD44780_ON) ? _gpio_set(dev->p.rs) : _gpio_clear(dev->p.rs);
/* if RW pin is available, set it to LOW */
if (gpio_is_valid(dev->p.rw)) {
gpio_clear(dev->p.rw);
_gpio_clear(dev->p.rw);
}
/* write data in 8Bit or 4Bit mode */
if (dev->flag & HD44780_8BITMODE) {
@ -88,15 +101,42 @@ static void _write_bits(const hd44780_t *dev, uint8_t bits, uint8_t value)
{
for (unsigned i = 0; i < bits; ++i) {
if ((value >> i) & 0x01) {
gpio_set(dev->p.data[i]);
_gpio_set(dev->p.data[i]);
}
else {
gpio_clear(dev->p.data[i]);
_gpio_clear(dev->p.data[i]);
}
}
_pulse(dev);
}
static inline int _gpio_init(gpio_t pin, gpio_mode_t mode)
{
#ifdef MODULE_PCF857X
return pcf857x_gpio_init(&_pcf857x_dev, pin, mode);
#else
return gpio_init(pin, mode);
#endif
}
static inline void _gpio_set(gpio_t pin)
{
#ifdef MODULE_PCF857X
pcf857x_gpio_set(&_pcf857x_dev, pin);
#else
gpio_set(pin);
#endif
}
static inline void _gpio_clear(gpio_t pin)
{
#ifdef MODULE_PCF857X
pcf857x_gpio_clear(&_pcf857x_dev, pin);
#else
gpio_clear(pin);
#endif
}
int hd44780_init(hd44780_t *dev, const hd44780_params_t *params)
{
/* write config params to device descriptor */
@ -130,22 +170,30 @@ int hd44780_init(hd44780_t *dev, const hd44780_params_t *params)
dev->roff[2] = 0x00 + dev->p.cols;
dev->roff[3] = 0x40 + dev->p.cols;
gpio_init(dev->p.rs, GPIO_OUT);
#ifdef MODULE_PCF857X
/*
* TODO: We need an approach for defining and initializing the PCF8574.
* With this approach, only one PCF8574 could exist in the system
*/
pcf857x_init(&_pcf857x_dev, &pcf857x_params[0]);
#endif
_gpio_init(dev->p.rs, GPIO_OUT);
/* RW (read/write) of LCD not required, set it to GPIO_UNDEF */
if (gpio_is_valid(dev->p.rw)) {
gpio_init(dev->p.rw, GPIO_OUT);
_gpio_init(dev->p.rw, GPIO_OUT);
}
gpio_init(dev->p.enable, GPIO_OUT);
_gpio_init(dev->p.enable, GPIO_OUT);
/* configure all data pins as output */
for (int i = 0; i < ((dev->flag & HD44780_8BITMODE) ? 8 : 4); ++i) {
gpio_init(dev->p.data[i], GPIO_OUT);
_gpio_init(dev->p.data[i], GPIO_OUT);
}
/* see hitachi HD44780 datasheet pages 45/46 for init specs */
xtimer_usleep(HD44780_INIT_WAIT_XXL);
gpio_clear(dev->p.rs);
gpio_clear(dev->p.enable);
_gpio_clear(dev->p.rs);
_gpio_clear(dev->p.enable);
if (gpio_is_valid(dev->p.rw)) {
gpio_clear(dev->p.rw);
_gpio_clear(dev->p.rw);
}
/* put the LCD into 4 bit or 8 bit mode */
if (!(dev->flag & HD44780_8BITMODE)) {

31
drivers/hd44780/include/hd44780_params.h
View File

@ -19,7 +19,11 @@
#define HD44780_PARAMS_H
#include "board.h"
#ifdef MODULE_PCF857X
#include "pcf857x.h"
#else
#include "periph/gpio.h"
#endif
#ifdef __cplusplus
extern "C"
@ -34,6 +38,9 @@ extern "C"
#ifndef HD44780_PARAM_ROWS
#define HD44780_PARAM_ROWS (2U)
#endif
#ifndef MODULE_PCF857X
#ifndef HD44780_PARAM_PIN_RS
#define HD44780_PARAM_PIN_RS GPIO_PIN(0, 14) /* Arduino D2 */
#endif
@ -54,6 +61,30 @@ extern "C"
GPIO_UNDEF }
#endif
#else /* !MODULE_PCF857X */
#ifndef HD44780_PARAM_PIN_RS
#define HD44780_PARAM_PIN_RS PCF857X_GPIO_PIN(0, 0) /* Bit 0 */
#endif
#ifndef HD44780_PARAM_PIN_RW
#define HD44780_PARAM_PIN_RW PCF857X_GPIO_PIN(0, 1) /* Bit 1 */
#endif
#ifndef HD44780_PARAM_PIN_ENABLE
#define HD44780_PARAM_PIN_ENABLE PCF857X_GPIO_PIN(0, 2) /* Bit 2 */
#endif
#ifndef HD44780_PARAM_PINS_DATA
#define HD44780_PARAM_PINS_DATA { PCF857X_GPIO_PIN(0, 4), /* Bit 4 */ \
PCF857X_GPIO_PIN(0, 5), /* Bit 5 */ \
PCF857X_GPIO_PIN(0, 6), /* Bit 6 */ \
PCF857X_GPIO_PIN(0, 7), /* Bit 7 */ \
GPIO_UNDEF, \
GPIO_UNDEF, \
GPIO_UNDEF, \
GPIO_UNDEF }
#endif
#endif /* !MODULE_PCF857X */
#ifndef HD44780_PARAMS
#define HD44780_PARAMS { .cols = HD44780_PARAM_COLS, \
.rows = HD44780_PARAM_ROWS, \