577 lines
16 KiB
C
577 lines
16 KiB
C
#include "platform.h"
|
|
#include "driver/console.h"
|
|
#include "driver/sigmadelta.h"
|
|
#include "driver/adc.h"
|
|
#include "driver/uart.h"
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "lua.h"
|
|
|
|
#include "esp_log.h"
|
|
|
|
int platform_init (void)
|
|
{
|
|
platform_ws2812_init();
|
|
return PLATFORM_OK;
|
|
}
|
|
|
|
|
|
// *****************************************************************************
|
|
// GPIO subsection
|
|
|
|
int platform_gpio_exists( unsigned gpio ) { return GPIO_IS_VALID_GPIO(gpio); }
|
|
int platform_gpio_output_exists( unsigned gpio ) { return GPIO_IS_VALID_OUTPUT_GPIO(gpio); }
|
|
|
|
|
|
// ****************************************************************************
|
|
// UART
|
|
|
|
#define PLATFORM_UART_EVENT_DATA (UART_EVENT_MAX + 1)
|
|
#define PLATFORM_UART_EVENT_OOM (UART_EVENT_MAX + 2)
|
|
#define PLATFORM_UART_EVENT_RX (UART_EVENT_MAX + 3)
|
|
#define PLATFORM_UART_EVENT_BREAK (UART_EVENT_MAX + 4)
|
|
|
|
static const char *UART_TAG = "uart";
|
|
|
|
uart_status_t uart_status[NUM_UART];
|
|
|
|
extern bool uart_on_data_cb(unsigned id, const char *buf, size_t len);
|
|
extern bool uart_on_error_cb(unsigned id, const char *buf, size_t len);
|
|
task_handle_t uart_event_task_id = 0;
|
|
|
|
void uart_event_task( task_param_t param, task_prio_t prio ) {
|
|
size_t p;
|
|
uint16_t need_len;
|
|
int16_t end_char;
|
|
char ch;
|
|
unsigned id;
|
|
uart_status_t *us;
|
|
uart_event_post_t *post = (uart_event_post_t *)param;
|
|
id = post->id;
|
|
us = & uart_status[id];
|
|
if(post->type == PLATFORM_UART_EVENT_DATA) {
|
|
need_len = us->need_len;
|
|
end_char = us->end_char;
|
|
|
|
for(p = 0; p < post->size; p++) {
|
|
ch = *(post->data + p);
|
|
us->line_buffer[us->line_position] = ch;
|
|
us->line_position++;
|
|
|
|
if((end_char == -1 && us->line_position == (need_len == 0? LUA_MAXINPUT : need_len))
|
|
|| (end_char >= 0 && (unsigned char)ch == (unsigned char)end_char)) {
|
|
// us->line_buffer[us->line_position] = 0;
|
|
uart_on_data_cb(id, us->line_buffer, us->line_position);
|
|
us->line_position = 0;
|
|
}
|
|
if(us->line_position + 1 >= LUA_MAXINPUT) {
|
|
us->line_position = 0;
|
|
}
|
|
}
|
|
if(end_char == -1 && need_len == 0 && us->line_position > 0) {
|
|
// us->line_buffer[us->line_position] = 0;
|
|
uart_on_data_cb(id, us->line_buffer, us->line_position);
|
|
us->line_position = 0;
|
|
}
|
|
|
|
free(post->data);
|
|
free(post);
|
|
} else {
|
|
char *err;
|
|
switch(post->type) {
|
|
case PLATFORM_UART_EVENT_OOM:
|
|
err = "out_of_memory";
|
|
break;
|
|
case PLATFORM_UART_EVENT_BREAK:
|
|
err = "break";
|
|
break;
|
|
case PLATFORM_UART_EVENT_RX:
|
|
default:
|
|
err = "rx_error";
|
|
}
|
|
uart_on_error_cb(id, err, strlen(err));
|
|
}
|
|
}
|
|
|
|
static void task_uart( void *pvParameters ){
|
|
unsigned id = (unsigned)pvParameters;
|
|
|
|
uart_event_post_t* post = NULL;
|
|
uart_event_t event;
|
|
|
|
for(;;) {
|
|
if(xQueueReceive(uart_status[id].queue, (void * )&event, (portTickType)portMAX_DELAY)) {
|
|
switch(event.type) {
|
|
case UART_DATA:
|
|
post = (uart_event_post_t*)malloc(sizeof(uart_event_post_t));
|
|
if(post == NULL) {
|
|
ESP_LOGE(UART_TAG, "Can not alloc memory in task_uart()");
|
|
// reboot here?
|
|
continue;
|
|
}
|
|
post->data = malloc(event.size);
|
|
if(post->data == NULL) {
|
|
ESP_LOGE(UART_TAG, "Can not alloc memory in task_uart()");
|
|
post->id = id;
|
|
post->type = PLATFORM_UART_EVENT_OOM;
|
|
} else {
|
|
post->id = id;
|
|
post->type = PLATFORM_UART_EVENT_DATA;
|
|
post->size = uart_read_bytes(id, (uint8_t *)post->data, event.size, 0);
|
|
}
|
|
break;
|
|
case UART_BREAK:
|
|
post = (uart_event_post_t*)malloc(sizeof(uart_event_post_t));
|
|
if(post == NULL) {
|
|
ESP_LOGE(UART_TAG, "Can not alloc memory in task_uart()");
|
|
// reboot here?
|
|
continue;
|
|
}
|
|
post->id = id;
|
|
post->type = PLATFORM_UART_EVENT_BREAK;
|
|
case UART_FIFO_OVF:
|
|
case UART_BUFFER_FULL:
|
|
case UART_PARITY_ERR:
|
|
case UART_FRAME_ERR:
|
|
post = (uart_event_post_t*)malloc(sizeof(uart_event_post_t));
|
|
if(post == NULL) {
|
|
ESP_LOGE(UART_TAG, "Can not alloc memory in task_uart()");
|
|
// reboot here?
|
|
continue;
|
|
}
|
|
post->id = id;
|
|
post->type = PLATFORM_UART_EVENT_RX;
|
|
break;
|
|
case UART_PATTERN_DET:
|
|
default:
|
|
;
|
|
}
|
|
if(post != NULL) {
|
|
task_post_medium( uart_event_task_id, (task_param_t)post );
|
|
post = NULL;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// pins must not be null for non-console uart
|
|
uint32_t platform_uart_setup( unsigned id, uint32_t baud, int databits, int parity, int stopbits, uart_pins_t* pins )
|
|
{
|
|
if (id == CONSOLE_UART)
|
|
{
|
|
ConsoleSetup_t cfg;
|
|
cfg.bit_rate = baud;
|
|
switch (databits)
|
|
{
|
|
case 5: cfg.data_bits = CONSOLE_NUM_BITS_5; break;
|
|
case 6: cfg.data_bits = CONSOLE_NUM_BITS_6; break;
|
|
case 7: cfg.data_bits = CONSOLE_NUM_BITS_7; break;
|
|
case 8: // fall-through
|
|
default: cfg.data_bits = CONSOLE_NUM_BITS_8; break;
|
|
}
|
|
switch (parity)
|
|
{
|
|
case PLATFORM_UART_PARITY_EVEN: cfg.parity = CONSOLE_PARITY_EVEN; break;
|
|
case PLATFORM_UART_PARITY_ODD: cfg.parity = CONSOLE_PARITY_ODD; break;
|
|
default: // fall-through
|
|
case PLATFORM_UART_PARITY_NONE: cfg.parity = CONSOLE_PARITY_NONE; break;
|
|
}
|
|
switch (stopbits)
|
|
{
|
|
default: // fall-through
|
|
case PLATFORM_UART_STOPBITS_1:
|
|
cfg.stop_bits = CONSOLE_STOP_BITS_1; break;
|
|
case PLATFORM_UART_STOPBITS_1_5:
|
|
cfg.stop_bits = CONSOLE_STOP_BITS_1_5; break;
|
|
case PLATFORM_UART_STOPBITS_2:
|
|
cfg.stop_bits = CONSOLE_STOP_BITS_2; break;
|
|
}
|
|
cfg.auto_baud = false;
|
|
console_setup (&cfg);
|
|
return baud;
|
|
}
|
|
else
|
|
{
|
|
int flow_control = UART_HW_FLOWCTRL_DISABLE;
|
|
if(pins->flow_control & PLATFORM_UART_FLOW_CTS) flow_control |= UART_HW_FLOWCTRL_CTS;
|
|
if(pins->flow_control & PLATFORM_UART_FLOW_RTS) flow_control |= UART_HW_FLOWCTRL_RTS;
|
|
|
|
uart_config_t cfg = {
|
|
.baud_rate = baud,
|
|
.flow_ctrl = flow_control,
|
|
.rx_flow_ctrl_thresh = UART_FIFO_LEN - 16,
|
|
};
|
|
|
|
switch (databits)
|
|
{
|
|
case 5: cfg.data_bits = UART_DATA_5_BITS; break;
|
|
case 6: cfg.data_bits = UART_DATA_6_BITS; break;
|
|
case 7: cfg.data_bits = UART_DATA_7_BITS; break;
|
|
case 8: // fall-through
|
|
default: cfg.data_bits = UART_DATA_8_BITS; break;
|
|
}
|
|
switch (parity)
|
|
{
|
|
case PLATFORM_UART_PARITY_EVEN: cfg.parity = UART_PARITY_EVEN; break;
|
|
case PLATFORM_UART_PARITY_ODD: cfg.parity = UART_PARITY_ODD; break;
|
|
default: // fall-through
|
|
case PLATFORM_UART_PARITY_NONE: cfg.parity = UART_PARITY_DISABLE; break;
|
|
}
|
|
switch (stopbits)
|
|
{
|
|
default: // fall-through
|
|
case PLATFORM_UART_STOPBITS_1:
|
|
cfg.stop_bits = UART_STOP_BITS_1; break;
|
|
case PLATFORM_UART_STOPBITS_1_5:
|
|
cfg.stop_bits = UART_STOP_BITS_1_5; break;
|
|
case PLATFORM_UART_STOPBITS_2:
|
|
cfg.stop_bits = UART_STOP_BITS_2; break;
|
|
}
|
|
uart_param_config(id, &cfg);
|
|
uart_set_pin(id, pins->tx_pin, pins->rx_pin, pins->rts_pin, pins->cts_pin);
|
|
uart_set_line_inverse(id, (pins->tx_inverse? UART_INVERSE_TXD : UART_INVERSE_DISABLE)
|
|
| (pins->rx_inverse? UART_INVERSE_RXD : UART_INVERSE_DISABLE)
|
|
| (pins->rts_inverse? UART_INVERSE_RTS : UART_INVERSE_DISABLE)
|
|
| (pins->cts_inverse? UART_INVERSE_CTS : UART_INVERSE_DISABLE)
|
|
);
|
|
|
|
if(uart_event_task_id == 0) uart_event_task_id = task_get_id( uart_event_task );
|
|
|
|
return baud;
|
|
}
|
|
}
|
|
|
|
|
|
void platform_uart_send_multi( unsigned id, const char *data, size_t len )
|
|
{
|
|
size_t i;
|
|
if (id == CONSOLE_UART) {
|
|
for( i = 0; i < len; i ++ ) {
|
|
putchar (data[ i ]);
|
|
}
|
|
} else {
|
|
uart_write_bytes(id, data, len);
|
|
}
|
|
}
|
|
|
|
void platform_uart_send( unsigned id, uint8_t data )
|
|
{
|
|
if (id == CONSOLE_UART)
|
|
putchar (data);
|
|
else
|
|
uart_write_bytes(id, (const char *)&data, 1);
|
|
}
|
|
|
|
void platform_uart_flush( unsigned id )
|
|
{
|
|
if (id == CONSOLE_UART)
|
|
fflush (stdout);
|
|
}
|
|
|
|
|
|
int platform_uart_start( unsigned id )
|
|
{
|
|
if (id == CONSOLE_UART)
|
|
return 0;
|
|
else {
|
|
uart_status_t *us = & uart_status[id];
|
|
|
|
esp_err_t ret = uart_driver_install(id, UART_BUFFER_SIZE, UART_BUFFER_SIZE, 3, & us->queue, 0);
|
|
if(ret != ESP_OK) {
|
|
return -1;
|
|
}
|
|
us->line_buffer = malloc(LUA_MAXINPUT);
|
|
us->line_position = 0;
|
|
if(us->line_buffer == NULL) {
|
|
uart_driver_delete(id);
|
|
return -1;
|
|
}
|
|
|
|
char pcName[6];
|
|
snprintf( pcName, 6, "uart%d", id );
|
|
pcName[5] = '\0';
|
|
if(xTaskCreate(task_uart, pcName, 2048, (void*)id, ESP_TASK_MAIN_PRIO + 1, & us->taskHandle) != pdPASS) {
|
|
uart_driver_delete(id);
|
|
free(us->line_buffer);
|
|
us->line_buffer = NULL;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void platform_uart_stop( unsigned id )
|
|
{
|
|
if (id == CONSOLE_UART)
|
|
;
|
|
else {
|
|
uart_status_t *us = & uart_status[id];
|
|
uart_driver_delete(id);
|
|
if(us->line_buffer) free(us->line_buffer);
|
|
us->line_buffer = NULL;
|
|
if(us->taskHandle) vTaskDelete(us->taskHandle);
|
|
us->taskHandle = NULL;
|
|
}
|
|
}
|
|
|
|
// *****************************************************************************
|
|
// Sigma-Delta platform interface
|
|
|
|
static gpio_num_t platform_sigma_delta_channel2gpio[SIGMADELTA_CHANNEL_MAX];
|
|
|
|
int platform_sigma_delta_exists( unsigned channel ) {
|
|
return (channel < SIGMADELTA_CHANNEL_MAX);
|
|
}
|
|
|
|
uint8_t platform_sigma_delta_setup( uint8_t channel, uint8_t gpio_num )
|
|
{
|
|
#if 0
|
|
// signal generator can't be stopped this way
|
|
// stop signal generator
|
|
if (ESP_OK != sigmadelta_set_prescale( channel, 0 ))
|
|
return 0;
|
|
#endif
|
|
|
|
// note channel to gpio assignment
|
|
platform_sigma_delta_channel2gpio[channel] = gpio_num;
|
|
|
|
return ESP_OK == sigmadelta_set_pin( channel, gpio_num ) ? 1 : 0;
|
|
}
|
|
|
|
uint8_t platform_sigma_delta_close( uint8_t channel )
|
|
{
|
|
#if 0
|
|
// Note: signal generator can't be stopped this way
|
|
// stop signal generator
|
|
if (ESP_OK != sigmadelta_set_prescale( channel, 0 ))
|
|
return 0;
|
|
#endif
|
|
|
|
gpio_set_level( platform_sigma_delta_channel2gpio[channel], 1 );
|
|
gpio_config_t cfg;
|
|
// force pin back to GPIO
|
|
cfg.intr_type = GPIO_INTR_DISABLE;
|
|
cfg.mode = GPIO_MODE_OUTPUT; // essential to switch IO matrix to GPIO
|
|
cfg.pull_down_en = GPIO_PULLDOWN_DISABLE;
|
|
cfg.pull_up_en = GPIO_PULLUP_ENABLE;
|
|
cfg.pin_bit_mask = 1 << platform_sigma_delta_channel2gpio[channel];
|
|
if (ESP_OK != gpio_config( &cfg ))
|
|
return 0;
|
|
|
|
// and set it finally to input with pull-up enabled
|
|
cfg.mode = GPIO_MODE_INPUT;
|
|
|
|
return ESP_OK == gpio_config( &cfg ) ? 1 : 0;
|
|
}
|
|
|
|
#if 0
|
|
// PWM emulation not possible, code kept for future reference
|
|
uint8_t platform_sigma_delta_set_pwmduty( uint8_t channel, uint8_t duty )
|
|
{
|
|
uint8_t target = 0, prescale = 0;
|
|
|
|
target = duty > 128 ? 256 - duty : duty;
|
|
prescale = target == 0 ? 0 : target-1;
|
|
|
|
//freq = 80000 (khz) /256 /duty_target * (prescale+1)
|
|
if (ESP_OK != sigmadelta_set_prescale( channel, prescale ))
|
|
return 0;
|
|
if (ESP_OK != sigmadelta_set_duty( channel, duty-128 ))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
uint8_t platform_sigma_delta_set_prescale( uint8_t channel, uint8_t prescale )
|
|
{
|
|
return ESP_OK == sigmadelta_set_prescale( channel, prescale ) ? 1 : 0;
|
|
}
|
|
|
|
uint8_t IRAM_ATTR platform_sigma_delta_set_duty( uint8_t channel, int8_t duty )
|
|
{
|
|
return ESP_OK == sigmadelta_set_duty( channel, duty ) ? 1 : 0;
|
|
}
|
|
// *****************************************************************************
|
|
// ADC
|
|
|
|
int platform_adc_exists( uint8_t adc ) { return adc < 2 && adc > 0; }
|
|
|
|
int platform_adc_channel_exists( uint8_t adc, uint8_t channel ) {
|
|
return (adc == 1 && channel < 8);
|
|
}
|
|
|
|
uint8_t platform_adc_set_width( uint8_t adc, int bits ) {
|
|
bits = bits - 9;
|
|
if (bits < ADC_WIDTH_9Bit || bits > ADC_WIDTH_12Bit)
|
|
return 0;
|
|
if (ESP_OK != adc1_config_width( bits ))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
uint8_t platform_adc_setup( uint8_t adc, uint8_t channel, uint8_t atten ) {
|
|
if (adc == 1 && ESP_OK != adc1_config_channel_atten( channel, atten ))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int platform_adc_read( uint8_t adc, uint8_t channel ) {
|
|
int value = -1;
|
|
if (adc == 1) value = adc1_get_voltage( channel );
|
|
return value;
|
|
}
|
|
|
|
int platform_adc_read_hall_sensor( ) {
|
|
int value = hall_sensor_read( );
|
|
return value;
|
|
}
|
|
// *****************************************************************************
|
|
// I2C platform interface
|
|
|
|
#if 0
|
|
// platform functions for the IDF I2C driver
|
|
// they're currently deactivated because of https://github.com/espressif/esp-idf/issues/241
|
|
// long-term goal is to use these instead of the SW driver in the #else branch
|
|
|
|
#include "driver/i2c.h"
|
|
int platform_i2c_setup( unsigned id, uint8_t sda, uint8_t scl, uint32_t speed ) {
|
|
i2c_config_t conf;
|
|
conf.mode = I2C_MODE_MASTER;
|
|
conf.sda_io_num = sda;
|
|
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
|
|
conf.scl_io_num = scl;
|
|
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
|
|
conf.master.clk_speed = speed;
|
|
if (ESP_OK != i2c_param_config( id, &conf ))
|
|
return 0;
|
|
|
|
if (ESP_OK != i2c_driver_install( id, conf.mode, 0, 0, 0 ))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int platform_i2c_send_start( unsigned id ) {
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_start( cmd );
|
|
esp_err_t ret = i2c_master_cmd_begin( id, cmd, 1000 / portTICK_RATE_MS );
|
|
i2c_cmd_link_delete( cmd );
|
|
|
|
return ret == ESP_OK ? 1 : 0;
|
|
}
|
|
|
|
int platform_i2c_send_stop( unsigned id ) {
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_stop( cmd );
|
|
esp_err_t ret = i2c_master_cmd_begin( id, cmd, 1000 / portTICK_RATE_MS );
|
|
i2c_cmd_link_delete( cmd );
|
|
|
|
return ret == ESP_OK ? 1 : 0;
|
|
}
|
|
|
|
int platform_i2c_send_address( unsigned id, uint16_t address, int direction, int ack_check_en ) {
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
|
|
direction = ( direction == PLATFORM_I2C_DIRECTION_TRANSMITTER ) ? 0 : 1;
|
|
|
|
i2c_master_write_byte( cmd, (uint8_t) ((address << 1) | direction ), ack_check_en );
|
|
|
|
esp_err_t ret = i2c_master_cmd_begin( id, cmd, 1000 / portTICK_RATE_MS );
|
|
i2c_cmd_link_delete( cmd );
|
|
|
|
// we return ack (1=acked).
|
|
if (ret == ESP_FAIL)
|
|
return 0;
|
|
else if (ret == ESP_OK)
|
|
return 1;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
int platform_i2c_send_byte( unsigned id, uint8_t data, int ack_check_en ) {
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_write_byte( cmd, data, ack_check_en );
|
|
|
|
esp_err_t ret = i2c_master_cmd_begin( id, cmd, 1000 / portTICK_RATE_MS );
|
|
i2c_cmd_link_delete( cmd );
|
|
|
|
// we return ack (1=acked).
|
|
if (ret == ESP_FAIL)
|
|
return 0;
|
|
else if (ret == ESP_OK)
|
|
return 1;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
int platform_i2c_recv_byte( unsigned id, int ack_val ){
|
|
uint8_t data;
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_read_byte( cmd, &data, ack_val > 0 ? 0 : 1 );
|
|
|
|
esp_err_t ret = i2c_master_cmd_begin( id, cmd, 1000 / portTICK_RATE_MS );
|
|
i2c_cmd_link_delete( cmd );
|
|
|
|
return ret == ESP_OK ? data : -1;
|
|
}
|
|
|
|
#else
|
|
|
|
// platform functions for SW-based I2C driver
|
|
// they work around the issue with the IDF driver
|
|
// remove when functions for the IDF driver can be used instead
|
|
|
|
#include "driver/i2c_sw_master.h"
|
|
int platform_i2c_setup( unsigned id, uint8_t sda, uint8_t scl, uint32_t speed ){
|
|
if (!platform_gpio_output_exists(sda) || !platform_gpio_output_exists(scl))
|
|
return 0;
|
|
|
|
if (speed != PLATFORM_I2C_SPEED_SLOW)
|
|
return 0;
|
|
|
|
i2c_sw_master_gpio_init(sda, scl);
|
|
return 1;
|
|
}
|
|
|
|
int platform_i2c_send_start( unsigned id ){
|
|
i2c_sw_master_start();
|
|
return 1;
|
|
}
|
|
|
|
int platform_i2c_send_stop( unsigned id ){
|
|
i2c_sw_master_stop();
|
|
return 1;
|
|
}
|
|
|
|
int platform_i2c_send_address( unsigned id, uint16_t address, int direction, int ack_check_en ){
|
|
// Convert enum codes to R/w bit value.
|
|
// If TX == 0 and RX == 1, this test will be removed by the compiler
|
|
if ( ! ( PLATFORM_I2C_DIRECTION_TRANSMITTER == 0 &&
|
|
PLATFORM_I2C_DIRECTION_RECEIVER == 1 ) ) {
|
|
direction = ( direction == PLATFORM_I2C_DIRECTION_TRANSMITTER ) ? 0 : 1;
|
|
}
|
|
|
|
i2c_sw_master_writeByte( (uint8_t) ((address << 1) | direction ));
|
|
// Low-level returns nack (0=acked); we return ack (1=acked).
|
|
return ! i2c_sw_master_getAck();
|
|
}
|
|
|
|
int platform_i2c_send_byte( unsigned id, uint8_t data, int ack_check_en ){
|
|
i2c_sw_master_writeByte(data);
|
|
// Low-level returns nack (0=acked); we return ack (1=acked).
|
|
return ! i2c_sw_master_getAck();
|
|
}
|
|
|
|
int platform_i2c_recv_byte( unsigned id, int ack ){
|
|
uint8_t r = i2c_sw_master_readByte();
|
|
i2c_sw_master_setAck( !ack );
|
|
return r;
|
|
}
|
|
#endif
|
|
|
|
int platform_i2c_exists( unsigned id ) { return id < I2C_NUM_MAX; }
|