ref: 964f145774586f574379cb1bb63522d61ac32ef8
dir: /serial.c/
// Copyright 2021 Jonne Kokkonen
// Released under the MIT licence, https://opensource.org/licenses/MIT
// Contains portions of code from libserialport's examples released to the
// public domain
#ifndef USE_LIBUSB
#include <SDL.h>
#include <libserialport.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "serial.h"
struct sp_port *m8_port = NULL;
// Helper function for error handling
static int check(enum sp_return result);
static int detect_m8_serial_device(struct sp_port *m8_port) {
// Check the connection method - we want USB serial devices
enum sp_transport transport = sp_get_port_transport(m8_port);
if (transport == SP_TRANSPORT_USB) {
// Get the USB vendor and product IDs.
int usb_vid, usb_pid;
sp_get_port_usb_vid_pid(m8_port, &usb_vid, &usb_pid);
if (usb_vid == 0x16C0 && usb_pid == 0x048A)
return 1;
}
return 0;
}
// Checks for connected devices and whether the specified device still exists
int check_serial_port() {
int device_found = 0;
/* A pointer to a null-terminated array of pointers to
* struct sp_port, which will contain the ports found.*/
struct sp_port **port_list;
/* Call sp_list_ports() to get the ports. The port_list
* pointer will be updated to refer to the array created. */
enum sp_return result = sp_list_ports(&port_list);
if (result != SP_OK) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "sp_list_ports() failed!\n");
abort();
}
/* Iterate through the ports. When port_list[i] is NULL
* this indicates the end of the list. */
for (int i = 0; port_list[i] != NULL; i++) {
struct sp_port *port = port_list[i];
if (detect_m8_serial_device(port)) {
if (strcmp(sp_get_port_name(port), sp_get_port_name(m8_port)) == 0)
device_found = 1;
}
}
sp_free_port_list(port_list);
return device_found;
}
int init_serial(int verbose) {
if (m8_port != NULL) {
// Port is already initialized
return 1;
}
/* A pointer to a null-terminated array of pointers to
* struct sp_port, which will contain the ports found.*/
struct sp_port **port_list;
if (verbose)
SDL_Log("Looking for USB serial devices.\n");
/* Call sp_list_ports() to get the ports. The port_list
* pointer will be updated to refer to the array created. */
enum sp_return result = sp_list_ports(&port_list);
if (result != SP_OK) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "sp_list_ports() failed!\n");
abort();
}
/* Iterate through the ports. When port_list[i] is NULL
* this indicates the end of the list. */
for (int i = 0; port_list[i] != NULL; i++) {
struct sp_port *port = port_list[i];
if (detect_m8_serial_device(port)) {
SDL_Log("Found M8 in %s.\n", sp_get_port_name(port));
sp_copy_port(port, &m8_port);
}
}
sp_free_port_list(port_list);
if (m8_port != NULL) {
// Open the serial port and configure it
SDL_Log("Opening port.\n");
enum sp_return result;
result = sp_open(m8_port, SP_MODE_READ_WRITE);
if (check(result) != SP_OK)
return 0;
result = sp_set_baudrate(m8_port, 115200);
if (check(result) != SP_OK)
return 0;
result = sp_set_bits(m8_port, 8);
if (check(result) != SP_OK)
return 0;
result = sp_set_parity(m8_port, SP_PARITY_NONE);
if (check(result) != SP_OK)
return 0;
result = sp_set_stopbits(m8_port, 1);
if (check(result) != SP_OK)
return 0;
result = sp_set_flowcontrol(m8_port, SP_FLOWCONTROL_NONE);
if (check(result) != SP_OK)
return 0;
} else {
if (verbose) {
SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Cannot find a M8.\n");
}
return 0;
}
return 1;
}
// Helper function for error handling.
static int check(enum sp_return result) {
char *error_message;
switch (result) {
case SP_ERR_ARG:
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Error: Invalid argument.\n");
break;
case SP_ERR_FAIL:
error_message = sp_last_error_message();
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Error: Failed: %s\n",
error_message);
sp_free_error_message(error_message);
break;
case SP_ERR_SUPP:
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Error: Not supported.\n");
break;
case SP_ERR_MEM:
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error: Couldn't allocate memory.\n");
break;
case SP_OK:
default:
break;
}
return result;
}
int reset_display() {
int result;
SDL_Log("Reset display\n");
char buf[1] = {'R'};
result = sp_blocking_write(m8_port, buf, 1, 5);
if (result != 1) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Error resetting M8 display, code %d",
result);
return 0;
}
return 1;
}
int enable_and_reset_display() {
int result;
SDL_Log("Enabling and resetting M8 display\n");
char buf[1] = {'E'};
result = sp_blocking_write(m8_port, buf, 1, 5);
if (result != 1) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Error enabling M8 display, code %d",
result);
return 0;
}
SDL_Delay(10);
result = reset_display();
return result;
}
int disconnect() {
int result;
SDL_Log("Disconnecting M8\n");
char buf[1] = {'D'};
result = sp_blocking_write(m8_port, buf, 1, 5);
if (result != 1) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Error sending disconnect, code %d",
result);
result = 0;
}
sp_close(m8_port);
sp_free_port(m8_port);
m8_port = NULL;
return result;
}
int serial_read(uint8_t *serial_buf, int count) {
return sp_nonblocking_read(m8_port, serial_buf, count);
}
int send_msg_controller(uint8_t input) {
char buf[2] = {'C', input};
size_t nbytes = 2;
int result;
result = sp_blocking_write(m8_port, buf, nbytes, 5);
if (result != nbytes) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Error sending input, code %d",
result);
return -1;
}
return 1;
}
int send_msg_keyjazz(uint8_t note, uint8_t velocity) {
if (velocity > 0x7F)
velocity = 0x7F;
char buf[3] = {'K', note, velocity};
size_t nbytes = 3;
int result;
result = sp_blocking_write(m8_port, buf, nbytes, 5);
if (result != nbytes) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Error sending keyjazz, code %d",
result);
return -1;
}
return 1;
}
#endif