The branch, master has been updated
via 26fc55b0994b070793515a85551db3e7102567f6 (commit)
from 428c8e67b98594cd1141d8b6c6eace60e0440803 (commit)
- Log -----------------------------------------------------------------
commit 26fc55b0994b070793515a85551db3e7102567f6
Author: Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Thu May 31 15:22:05 2018 +0200
examples/async.c : Short example using async read/write
-----------------------------------------------------------------------
Summary of changes:
examples/CMakeLists.txt | 2 +
examples/async.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 149 insertions(+), 0 deletions(-)
create mode 100644 examples/async.c
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 97ab096..6155756 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -14,6 +14,7 @@ add_executable(serial_test serial_test.c)
add_executable(baud_test baud_test.c)
add_executable(stream_test stream_test.c)
add_executable(eeprom eeprom.c)
+add_executable(async async.c)
# Linkage
target_link_libraries(simple ftdi1)
@@ -26,6 +27,7 @@ target_link_libraries(serial_test ftdi1)
target_link_libraries(baud_test ftdi1)
target_link_libraries(stream_test ftdi1)
target_link_libraries(eeprom ftdi1)
+target_link_libraries(async ftdi1)
# libftdi++ examples
if( FTDIPP )
diff --git a/examples/async.c b/examples/async.c
new file mode 100644
index 0000000..08457b9
--- /dev/null
+++ b/examples/async.c
@@ -0,0 +1,147 @@
+/* LIBFTDI EEPROM access example
+
+ This program is distributed under the GPL, version 2
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <ftdi.h>
+
+int main(int argc, char **argv)
+{
+ struct ftdi_context *ftdi;
+ int do_read = 0;
+ int do_write = 0;
+ int i, f, retval;
+
+ if ((ftdi = ftdi_new()) == 0)
+ {
+ fprintf(stderr, "Failed to allocate ftdi structure :%s \n",
+ ftdi_get_error_string(ftdi));
+ return EXIT_FAILURE;
+ }
+
+ while ((i = getopt(argc, argv, "brw")) != -1)
+ {
+ switch (i)
+ {
+ case 'b':
+ do_read = 1;
+ do_write = 1;
+ break;
+ case 'r':
+ do_read = 1;
+ break;
+ case 'w':
+ do_write = 1;
+ break;
+ default:
+ fprintf(stderr, "usage: %s [options]\n", *argv);
+ fprintf(stderr, "\t-b do synchronous read and write\n");
+ fprintf(stderr, "\t-r do synchronous read\n");
+ fprintf(stderr, "\t-w do synchronous write\n");
+ retval = -1;
+ goto done;
+ }
+ }
+
+ // Select first interface
+ ftdi_set_interface(ftdi, INTERFACE_ANY);
+
+ struct ftdi_device_list *devlist;
+ int res;
+ if ((res = ftdi_usb_find_all(ftdi, &devlist, 0, 0)) < 0)
+ {
+ fprintf(stderr, "No FTDI with default VID/PID found\n");
+ retval = EXIT_FAILURE;
+ goto do_deinit;
+ }
+ if (res > 0)
+ {
+ int i = 1;
+ f = ftdi_usb_open_dev(ftdi, devlist[0].dev);
+ if (f < 0)
+ {
+ fprintf(stderr, "Unable to open device %d: (%s)",
+ i, ftdi_get_error_string(ftdi));
+ retval = -1;
+ goto do_deinit;
+ }
+ }
+ else
+ {
+ fprintf(stderr, "No devices found\n");
+ retval = -1;
+ goto do_deinit;
+ }
+ ftdi_list_free(&devlist);
+ int err = ftdi_usb_purge_buffers(ftdi);
+ if (err != 0) {
+ fprintf(stderr, "ftdi_usb_purge_buffer: %d: %s\n",
+ err, ftdi_get_error_string(ftdi));
+ retval = -1;
+ goto do_deinit;
+ }
+ /* Reset MPSSE controller. */
+ err = ftdi_set_bitmode(ftdi, 0, BITMODE_RESET);
+ if (err != 0) {
+ fprintf(stderr, "ftdi_set_bitmode: %d: %s\n",
+ err, ftdi_get_error_string(ftdi));
+ retval = -1;
+ goto do_deinit;
+ }
+ /* Enable MPSSE controller. Pin directions are set later.*/
+ err = ftdi_set_bitmode(ftdi, 0, BITMODE_MPSSE);
+ if (err != 0) {
+ fprintf(stderr, "ftdi_set_bitmode: %d: %s\n",
+ err, ftdi_get_error_string(ftdi));
+ return -1;
+ }
+ uint8_t ftdi_init[15] = {TCK_DIVISOR, 0x00, 0x00,
+ SET_BITS_HIGH, 0, 0xff,
+ GET_BITS_HIGH,
+ SET_BITS_HIGH, 0x55, 0xff,
+ GET_BITS_HIGH,
+ SET_BITS_HIGH, 0xaa, 0xff,
+ GET_BITS_HIGH};
+ struct ftdi_transfer_control *tc_read;
+ struct ftdi_transfer_control *tc_write;
+ uint8_t data[3];
+ if (do_read) {
+ tc_read = ftdi_read_data_submit(ftdi, data, 3);
+ }
+ if (do_write) {
+ tc_write = ftdi_write_data_submit(ftdi, ftdi_init, 15);
+ int transfer = ftdi_transfer_data_done(tc_write);
+ printf("Async write %d\n", transfer);
+ } else {
+ int written = ftdi_write_data(ftdi, ftdi_init, 15);
+ if (written != 15) {
+ printf("Sync write failed\n");
+ }
+ }
+ if (do_read) {
+ int transfer = ftdi_transfer_data_done(tc_read);
+ printf("Async Read %d\n", transfer);
+ } else {
+ int index = 0;
+ while (index < 3) {
+ int res = ftdi_read_data(ftdi, data + index, 3 - index);
+ if (res < 0) {
+ printf("Async read failure at %d\n", index);
+ } else {
+ index += res;
+ }
+ }
+ }
+ printf("Read %02x %02x %02x\n", data[0], data[1], data[2]);
+done:
+ ftdi_usb_close(ftdi);
+do_deinit:
+ ftdi_free(ftdi);
+ return retval;
+}
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