demo of driving MAX2719 dot matrix displays with STM32F103 Bluepill
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f103-dotmatrix/project/com/com_fileio.c

97 lines
2.0 KiB

#include "main.h"
#include "com_fileio.h"
#include "com_iface.h"
#include "utils/str_utils.h"
// Holding fields for ifaces
ComIface *debug_iface = NULL;
ComIface *data_iface = NULL;
ComIface *gamepad_iface = NULL;
// --- File descriptor names ------------------------------
struct name_fd {
const char *name;
const int fd;
};
#define NAME_FD_MAP_LEN 1
/** pre-assigned file descriptors for names */
static const struct name_fd name_fd_map[NAME_FD_MAP_LEN] = {
{FNAME_DLNK, FD_DLNK}
};
// --- Syscalls -------------------------------------------
/**
* @brief Write to a file by file descriptor.
*
* @param fd : open file descriptor
* @param buf : data to write
* @param len : buffer size
* @return number of written bytes
*/
int _write(int fd, const char *buf, int len)
{
switch (fd) {
case FD_STDOUT: return (int)com_tx_block(debug_iface, buf, (size_t)len);
case FD_STDERR: return (int)com_tx_block(debug_iface, buf, (size_t)len);
case FD_DLNK: return (int)com_tx_block(data_iface, buf, (size_t)len);
default:
return 0;
}
}
// For some reason, reading does not work.
#if 0
/**
* @brief Read from a file descriptor
*
* @param fd : file descriptor
* @param buf : destination buffer
* @param len : number of bytes to read
* @return actual number of read bytes
*/
int _read(int fd, char *buf, int len)
{
switch (fd) {
case FD_STDIN: return com_rx_block(debug_iface, buf, len);
case FD_ESP: return com_rx_block(esp_iface, buf, len);
default:
return 0;
}
}
#endif
/**
* @brief Open a file by name.
*
* This stub is called by newlib when fopen is used.
* It returns a pre-assigned file descriptor based
* on the name.
*
* @note
* stdout, stderr, stdin are open implicitly
*
* @param name : file name
* @param flags : file flags (ignored)
* @return file descriptor
*/
int _open(const char *name, int flags, ...)
{
(void)flags;
for (int i = 0; i < NAME_FD_MAP_LEN; i++) {
if (streq(name_fd_map[i].name, name)) {
return name_fd_map[i].fd;
}
}
return -1;
}