Renesas
The driver for the ESP32 WiFi module
The ESP32 WiFi driver for Mbed OS
The Mbed OS driver for the ESP32 WiFi module.
Firmware version
How to write mbed-os compatible firmware : https://github.com/d-kato/GR-Boards_ESP32_Serial_Bridge
Restrictions
- Setting up an UDP server is not possible
- The serial port does not have hardware flow control enabled. The AT command set does not either have a way to limit the download rate. Therefore, downloading anything larger than the serial port input buffer is unreliable. An application should be able to read fast enough to stay ahead of the network. This affects mostly the TCP protocol where data would be lost with no notification. On UDP, this would lead to only packet losses which the higher layer protocol should recover from.
Note
Revision 1:5d78eedef723, committed 2018-07-02
- Comitter:
- dkato
- Date:
- Mon Jul 02 02:21:21 2018 +0000
- Parent:
- 0:92d12d355ba9
- Child:
- 2:cb5c0d3fa776
- Commit message:
- Synchronized with git revision 5407cadab12f6c2a07348950b2fcde42b9d7a050
Changed in this revision
--- a/ESP32/ESP32.cpp Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32/ESP32.cpp Mon Jul 02 02:21:21 2018 +0000
@@ -18,13 +18,15 @@
#include "ESP32.h"
#define ESP32_DEFAULT_BAUD_RATE 115200
+#define ESP32_ALL_SOCKET_IDS -1
ESP32 * ESP32::instESP32 = NULL;
-ESP32 * ESP32::getESP32Inst(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate)
+ESP32 * ESP32::getESP32Inst(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate)
{
if (instESP32 == NULL) {
- instESP32 = new ESP32(en, io0, tx, rx, debug, baudrate);
+ instESP32 = new ESP32(en, io0, tx, rx, debug, rts, cts, baudrate);
} else {
if (debug) {
instESP32->debugOn(debug);
@@ -33,7 +35,8 @@
return instESP32;
}
-ESP32::ESP32(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate)
+ESP32::ESP32(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate)
: _p_wifi_en(NULL), _p_wifi_io0(NULL), init_end(false)
, _serial(tx, rx, ESP32_DEFAULT_BAUD_RATE), _parser(&_serial, "\r\n", 512)
, _packets(0), _packets_end(&_packets)
@@ -53,6 +56,19 @@
memset(_ids, 0, sizeof(_ids));
memset(_cbs, 0, sizeof(_cbs));
+ _rts = rts;
+ _cts = cts;
+
+ if ((_rts != NC) && (_cts != NC)) {
+ _flow_control = 3;
+ } else if (_rts != NC) {
+ _flow_control = 1;
+ } else if (_cts != NC) {
+ _flow_control = 2;
+ } else {
+ _flow_control = 0;
+ }
+
_serial.set_baud(ESP32_DEFAULT_BAUD_RATE);
debugOn(debug);
@@ -70,6 +86,8 @@
_parser.oob("WIFI ", callback(this, &ESP32::_connection_status_handler));
_serial.sigio(Callback<void()>(this, &ESP32::event));
+
+ setTimeout();
}
void ESP32::debugOn(bool debug)
@@ -82,6 +100,7 @@
int version;
_smutex.lock();
+ startup();
bool done = _parser.send("AT+GMR")
&& _parser.recv("SDK version:%d", &version)
&& _parser.recv("OK");
@@ -264,11 +283,32 @@
if (_parser.send("AT+RST")
&& _parser.recv("OK")) {
_serial.set_baud(ESP32_DEFAULT_BAUD_RATE);
+#if DEVICE_SERIAL_FC
+ _serial.set_flow_control(SerialBase::Disabled);
+#endif
_parser.recv("ready");
+ _clear_socket_packets(ESP32_ALL_SOCKET_IDS);
if (_parser.send("AT+UART_CUR=%d,8,1,0,%d", _baudrate, 0)
&& _parser.recv("OK")) {
_serial.set_baud(_baudrate);
+#if DEVICE_SERIAL_FC
+ switch (_flow_control) {
+ case 1:
+ _serial.set_flow_control(SerialBase::RTS, _rts);
+ break;
+ case 2:
+ _serial.set_flow_control(SerialBase::CTS, _cts);
+ break;
+ case 3:
+ _serial.set_flow_control(SerialBase::RTSCTS, _rts, _cts);
+ break;
+ case 0:
+ default:
+ // do nothing
+ break;
+ }
+#endif
}
return true;
@@ -573,6 +613,7 @@
&& _parser.recv("OK");
}
setTimeout();
+ _clear_socket_packets(id);
_smutex.unlock();
return ret;
@@ -626,8 +667,8 @@
{
int id;
int amount;
+ uint32_t tmp_timeout;
- startup();
// parse out the packet
if (!_parser.recv(",%d,%d:", &id, &amount)) {
return;
@@ -644,9 +685,11 @@
packet->next = 0;
packet->index = 0;
+ tmp_timeout = last_timeout_ms;
+ setTimeout(500);
if (!(_parser.read((char*)(packet + 1), amount))) {
free(packet);
- setTimeout();
+ setTimeout(tmp_timeout);
return;
}
@@ -702,40 +745,67 @@
}
}
+void ESP32::_clear_socket_packets(int id)
+{
+ struct packet **p = &_packets;
+
+ while (*p) {
+ if ((*p)->id == id || id == ESP32_ALL_SOCKET_IDS) {
+ struct packet *q = *p;
+
+ if (_packets_end == &(*p)->next) {
+ _packets_end = p; // Set last packet next field/_packets
+ }
+ *p = (*p)->next;
+
+ free(q);
+ } else {
+ // Point to last packet next field
+ p = &(*p)->next;
+ }
+ }
+}
+
bool ESP32::close(int id, bool wait_close)
{
if (wait_close) {
+ _smutex.lock();
for (int j = 0; j < 2; j++) {
if (((_id_bits & (1 << id)) == 0)
|| ((_id_bits_close & (1 << id)) != 0)) {
_id_bits_close &= ~(1 << id);
_ids[id] = false;
+ _clear_socket_packets(id);
+ _smutex.unlock();
return true;
}
- _smutex.lock();
startup();
setTimeout(500);
_parser.process_oob(); // Poll for inbound packets
setTimeout();
}
+ _smutex.unlock();
}
//May take a second try if device is busy
for (unsigned i = 0; i < 2; i++) {
+ _smutex.lock();
if ((_id_bits & (1 << id)) == 0) {
_id_bits_close &= ~(1 << id);
_ids[id] = false;
+ _clear_socket_packets(id);
+ _smutex.unlock();
return true;
}
- _smutex.lock();
startup();
setTimeout(500);
if (_parser.send("AT+CIPCLOSE=%d", id)
&& _parser.recv("OK")) {
setTimeout();
- _smutex.unlock();
+ _clear_socket_packets(id);
_id_bits_close &= ~(1 << id);
_ids[id] = false;
+ _smutex.unlock();
return true;
}
setTimeout();
@@ -748,6 +818,7 @@
void ESP32::setTimeout(uint32_t timeout_ms)
{
+ last_timeout_ms = timeout_ms;
_parser.set_timeout(timeout_ms);
}
--- a/ESP32/ESP32.h Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32/ESP32.h Mon Jul 02 02:21:21 2018 +0000
@@ -40,9 +40,11 @@
/**
* Static method to create or retrieve the single ESP32 instance
*/
- static ESP32 * getESP32Inst(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate);
+ static ESP32 * getESP32Inst(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate);
- ESP32(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate);
+ ESP32(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate);
/**
* Check firmware version of ESP8266
@@ -249,6 +251,10 @@
} *_packets, **_packets_end;
int _wifi_mode;
int _baudrate;
+ PinName _rts;
+ PinName _cts;
+ int _flow_control;
+ uint32_t last_timeout_ms;
std::vector<int> _accept_id;
uint32_t _id_bits;
@@ -282,6 +288,7 @@
void _closed_handler_4();
void _connection_status_handler();
void _packet_handler();
+ void _clear_socket_packets(int id);
void event();
bool recv_ap(nsapi_wifi_ap_t *ap);
--- a/ESP32Interface.cpp Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32Interface.cpp Mon Jul 02 02:21:21 2018 +0000
@@ -18,8 +18,9 @@
#include "ESP32Interface.h"
// ESP32Interface implementation
-ESP32Interface::ESP32Interface(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate) :
- ESP32Stack(en, io0, tx, rx, debug, baudrate),
+ESP32Interface::ESP32Interface(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate) :
+ ESP32Stack(en, io0, tx, rx, debug, rts, cts, baudrate),
_dhcp(true),
_ap_ssid(),
_ap_pass(),
@@ -33,8 +34,8 @@
_esp->attach_wifi_status(callback(this, &ESP32Interface::wifi_status_cb));
}
-ESP32Interface::ESP32Interface(PinName tx, PinName rx, bool debug, int baudrate) :
- ESP32Stack(NC, NC, tx, rx, debug, baudrate),
+ESP32Interface::ESP32Interface(PinName tx, PinName rx, bool debug) :
+ ESP32Stack(NC, NC, tx, rx, debug, NC, NC, 230400),
_dhcp(true),
_ap_ssid(),
_ap_pass(),
--- a/ESP32Interface.h Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32Interface.h Mon Jul 02 02:21:21 2018 +0000
@@ -32,17 +32,19 @@
* @param tx TX pin
* @param rx RX pin
* @param debug Enable debugging
+ * @param rts RTS pin
+ * @param cts CTS pin
* @param baudrate The baudrate of the serial port (default = 230400).
*/
- ESP32Interface(PinName en, PinName io0, PinName tx, PinName rx, bool debug = false, int baudrate = 230400);
+ ESP32Interface(PinName en, PinName io0, PinName tx, PinName rx, bool debug = false,
+ PinName rts = NC, PinName cts = NC, int baudrate = 230400);
/** ESP32Interface lifetime
* @param tx TX pin
* @param rx RX pin
* @param debug Enable debugging
- * @param baudrate The baudrate of the serial port (default = 230400).
*/
- ESP32Interface(PinName tx, PinName rx, bool debug = false, int baudrate = 230400);
+ ESP32Interface(PinName tx, PinName rx, bool debug = false);
/** Set a static IP address
*
--- a/ESP32InterfaceAP.cpp Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32InterfaceAP.cpp Mon Jul 02 02:21:21 2018 +0000
@@ -18,8 +18,9 @@
#include "ESP32InterfaceAP.h"
// ESP32InterfaceAP implementation
-ESP32InterfaceAP::ESP32InterfaceAP(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate) :
- ESP32Stack(en, io0, tx, rx, debug, baudrate),
+ESP32InterfaceAP::ESP32InterfaceAP(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate) :
+ ESP32Stack(en, io0, tx, rx, debug, rts, cts, baudrate),
_dhcp(true),
_own_ch(1),
_own_ssid(),
@@ -33,8 +34,8 @@
{
}
-ESP32InterfaceAP::ESP32InterfaceAP(PinName tx, PinName rx, bool debug, int baudrate) :
- ESP32Stack(NC, NC, tx, rx, debug, baudrate),
+ESP32InterfaceAP::ESP32InterfaceAP(PinName tx, PinName rx, bool debug) :
+ ESP32Stack(NC, NC, tx, rx, debug, NC, NC, 230400),
_dhcp(true),
_own_ch(1),
_own_ssid(),
--- a/ESP32InterfaceAP.h Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32InterfaceAP.h Mon Jul 02 02:21:21 2018 +0000
@@ -33,17 +33,19 @@
* @param tx TX pin
* @param rx RX pin
* @param debug Enable debugging
+ * @param rts RTS pin
+ * @param cts CTS pin
* @param baudrate The baudrate of the serial port (default = 230400).
*/
- ESP32InterfaceAP(PinName en, PinName io0, PinName tx, PinName rx, bool debug = false, int baudrate = 230400);
+ ESP32InterfaceAP(PinName en, PinName io0, PinName tx, PinName rx, bool debug = false,
+ PinName rts = NC, PinName cts = NC, int baudrate = 230400);
/** ESP32InterfaceAP lifetime
* @param tx TX pin
* @param rx RX pin
* @param debug Enable debugging
- * @param baudrate The baudrate of the serial port (default = 230400).
*/
- ESP32InterfaceAP(PinName tx, PinName rx, bool debug = false, int baudrate = 230400);
+ ESP32InterfaceAP(PinName tx, PinName rx, bool debug = false);
/** Set a static IP address
*
--- a/ESP32Stack.cpp Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32Stack.cpp Mon Jul 02 02:21:21 2018 +0000
@@ -19,9 +19,10 @@
#include "ESP32Stack.h"
// ESP32Stack implementation
-ESP32Stack::ESP32Stack(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate)
+ESP32Stack::ESP32Stack(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate)
{
- _esp = ESP32::getESP32Inst(en, io0, tx, rx, debug, baudrate);
+ _esp = ESP32::getESP32Inst(en, io0, tx, rx, debug, rts, cts, baudrate);
memset(_local_ports, 0, sizeof(_local_ports));
}
--- a/ESP32Stack.h Fri Jun 29 06:17:38 2018 +0000
+++ b/ESP32Stack.h Mon Jul 02 02:21:21 2018 +0000
@@ -33,9 +33,12 @@
* @param tx TX pin
* @param rx RX pin
* @param debug Enable debugging
+ * @param rts RTS pin
+ * @param cts CTS pin
* @param baudrate The baudrate of the serial port.
*/
- ESP32Stack(PinName en, PinName io0, PinName tx, PinName rx, bool debug, int baudrate);
+ ESP32Stack(PinName en, PinName io0, PinName tx, PinName rx, bool debug,
+ PinName rts, PinName cts, int baudrate);
protected:
/** Open a socket