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nodemcu-firmware/app/platform/u8x8_nodemcu_hal.c

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// Do not use the code from u8g2 submodule and skip the complete source here
// if the u8g2 module is not selected.
// Reason: The whole u8g2 submodule code tree might not even exist in this case.
#include "user_modules.h"
#ifdef LUA_USE_MODULES_U8G2
#include <string.h>
#include "c_stdlib.h"
#include "platform.h"
#define U8X8_USE_PINS
#include "u8x8_nodemcu_hal.h"
// static variables containing info about the i2c link
// TODO: move to user space in u8x8_t once available
typedef struct {
uint8_t id;
} hal_i2c_t;
// static variables containing info about the spi link
// TODO: move to user space in u8x8_t once available
typedef struct {
uint8_t host;
//spi_device_handle_t device;
uint8_t last_dc;
struct {
uint8_t *data;
size_t size, used;
} buffer;
} hal_spi_t;
static void flush_buffer_spi( hal_spi_t *hal )
{
if (hal->buffer.data && hal->buffer.used > 0) {
platform_spi_blkwrite( hal->host, hal->buffer.used, hal->buffer.data );
hal->buffer.used = 0;
}
}
static void force_flush_buffer(u8x8_t *u8x8)
{
// spi hal has a buffer that can be flushed
if (u8x8->byte_cb == u8x8_byte_nodemcu_spi) {
hal_spi_t *hal = ((u8g2_nodemcu_t *)u8x8)->hal;
flush_buffer_spi( hal );
}
}
uint8_t u8x8_gpio_and_delay_nodemcu(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
uint32_t temp;
switch(msg)
{
case U8X8_MSG_GPIO_AND_DELAY_INIT: // called once during init phase of u8g2/u8x8
// can be used to setup pins
for (int idx = 0; idx < U8X8_PIN_OUTPUT_CNT; idx++) {
if (u8x8->pins[idx] != U8X8_PIN_NONE) {
// configure pin as output
if (idx == U8X8_PIN_I2C_CLOCK || idx == U8X8_PIN_I2C_DATA) {
platform_gpio_mode( u8x8->pins[idx], PLATFORM_GPIO_OPENDRAIN, PLATFORM_GPIO_PULLUP );
} else {
platform_gpio_mode( u8x8->pins[idx], PLATFORM_GPIO_OUTPUT, PLATFORM_GPIO_FLOAT );
}
}
}
break;
case U8X8_MSG_DELAY_NANO: // delay arg_int * 1 nano second
force_flush_buffer(u8x8);
os_delay_us( 1 );
break;
case U8X8_MSG_DELAY_100NANO: // delay arg_int * 100 nano seconds
force_flush_buffer(u8x8);
temp = arg_int * 100;
temp /= 1000;
os_delay_us( temp > 0 ? temp : 1 );
break;
case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
force_flush_buffer(u8x8);
os_delay_us( arg_int * 10 );
break;
case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
force_flush_buffer(u8x8);
os_delay_us( arg_int * 1000 );
system_soft_wdt_feed();
break;
case U8X8_MSG_DELAY_I2C: // arg_int is the I2C speed in 100KHz, e.g. 4 = 400 KHz
force_flush_buffer(u8x8);
temp = 5000 / arg_int; // arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us
temp /= 1000;
os_delay_us( temp > 0 ? temp : 1 );
break;
case U8X8_MSG_GPIO_D0: // D0 or SPI clock pin: Output level in arg_int
//case U8X8_MSG_GPIO_SPI_CLOCK:
break;
case U8X8_MSG_GPIO_D1: // D1 or SPI data pin: Output level in arg_int
//case U8X8_MSG_GPIO_SPI_DATA:
break;
case U8X8_MSG_GPIO_D2: // D2 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D3: // D3 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D4: // D4 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D5: // D5 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D6: // D6 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D7: // D7 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_E: // E/WR pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS: // CS (chip select) pin: Output level in arg_int
platform_gpio_write( u8x8_GetPinValue( u8x8, msg ), arg_int );
break;
case U8X8_MSG_GPIO_DC: // DC (data/cmd, A0, register select) pin: Output level in arg_int
platform_gpio_write( u8x8_GetPinValue( u8x8, msg ), arg_int );
break;
case U8X8_MSG_GPIO_RESET: // Reset pin: Output level in arg_int
if (u8x8_GetPinValue( u8x8, msg ) != U8X8_PIN_NONE)
platform_gpio_write( u8x8_GetPinValue(u8x8, msg), arg_int );
break;
case U8X8_MSG_GPIO_CS1: // CS1 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS2: // CS2 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_I2C_CLOCK: // arg_int=0: Output low at I2C clock pin
// arg_int=1: Input dir with pullup high for I2C clock pin
// for SW comm routine
platform_gpio_write( u8x8_GetPinValue( u8x8, msg ), arg_int );
break;
case U8X8_MSG_GPIO_I2C_DATA: // arg_int=0: Output low at I2C data pin
// arg_int=1: Input dir with pullup high for I2C data pin
// for SW comm routine
platform_gpio_write( u8x8_GetPinValue( u8x8, msg ), arg_int );
break;
case U8X8_MSG_GPIO_MENU_SELECT:
case U8X8_MSG_GPIO_MENU_NEXT:
case U8X8_MSG_GPIO_MENU_PREV:
case U8X8_MSG_GPIO_MENU_HOME:
u8x8_SetGPIOResult( u8x8, /* get menu select pin state */ 0 );
break;
default:
u8x8_SetGPIOResult( u8x8, 1 ); // default return value
break;
}
return 1;
}
uint8_t u8x8_byte_nodemcu_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
uint8_t *data;
hal_i2c_t *hal = ((u8g2_nodemcu_t *)u8x8)->hal;
switch(msg) {
case U8X8_MSG_BYTE_SEND:
if (hal->id < NUM_I2C) {
data = (uint8_t *)arg_ptr;
while( arg_int > 0 ) {
platform_i2c_send_byte( hal->id, *data );
data++;
arg_int--;
}
} else {
// invalid id
return 0;
}
break;
case U8X8_MSG_BYTE_INIT:
{
// the hal member initially contains the i2c id
int id = (int)hal;
if (!(hal = c_malloc( sizeof ( hal_i2c_t ) )))
return 0;
hal->id = id;
((u8g2_nodemcu_t *)u8x8)->hal = hal;
}
break;
case U8X8_MSG_BYTE_SET_DC:
break;
case U8X8_MSG_BYTE_START_TRANSFER:
if (hal->id < NUM_I2C) {
platform_i2c_send_start( hal->id );
platform_i2c_send_address( hal->id, u8x8_GetI2CAddress(u8x8), PLATFORM_I2C_DIRECTION_TRANSMITTER );
} else {
// invalid id
return 0;
}
break;
case U8X8_MSG_BYTE_END_TRANSFER:
if (hal->id < NUM_I2C) {
platform_i2c_send_stop( hal->id );
} else {
// invalid id
return 0;
}
break;
default:
return 0;
}
return 1;
}
uint8_t u8x8_byte_nodemcu_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
hal_spi_t *hal = ((u8g2_nodemcu_t *)u8x8)->hal;
switch(msg) {
case U8X8_MSG_BYTE_INIT:
{
/* disable chipselect */
u8x8_gpio_SetCS( u8x8, u8x8->display_info->chip_disable_level );
// the hal member initially contains the spi host id
int host = (int)hal;
if (!(hal = c_malloc( sizeof ( hal_spi_t ) )))
return 0;
hal->host = host;
((u8g2_nodemcu_t *)u8x8)->hal = hal;
hal->buffer.data = NULL;
hal->last_dc = 0;
}
break;
case U8X8_MSG_BYTE_SET_DC:
if (hal->last_dc != arg_int)
flush_buffer_spi( hal );
u8x8_gpio_SetDC( u8x8, arg_int );
hal->last_dc = arg_int;
break;
case U8X8_MSG_BYTE_START_TRANSFER:
hal->buffer.size = 256;
if (!(hal->buffer.data = (uint8_t *)c_malloc( hal->buffer.size )))
return 0;
hal->buffer.used = 0;
u8x8_gpio_SetCS( u8x8, u8x8->display_info->chip_enable_level );
break;
case U8X8_MSG_BYTE_SEND:
if (!hal->buffer.data)
return 0;
while (hal->buffer.size - hal->buffer.used < arg_int) {
hal->buffer.size *= 2;
uint8_t *tmp;
if (!(tmp = (uint8_t *)c_malloc( hal->buffer.size ))) {
c_free( hal->buffer.data );
hal->buffer.data = NULL;
return 0;
}
os_memcpy( tmp, hal->buffer.data, hal->buffer.used );
c_free( hal->buffer.data );
hal->buffer.data = tmp;
}
os_memcpy( hal->buffer.data + hal->buffer.used, arg_ptr, arg_int );
hal->buffer.used += arg_int;
break;
case U8X8_MSG_BYTE_END_TRANSFER:
if (!hal->buffer.data)
return 0;
flush_buffer_spi( hal );
u8x8_gpio_SetCS( u8x8, u8x8->display_info->chip_disable_level );
c_free( hal->buffer.data );
hal->buffer.data = NULL;
break;
default:
return 0;
}
return 1;
}
#endif /* LUA_USE_MODULES_U8G2 */
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