paco_espinola
Member
Hi.
I am trying to communicate the maple board with serial3. But the other device accept handshaking using cts rts (a sms/gprs module).
I connect the D32 and D33 but only when I put the D33 to ground my communication start.
Is there some way to activate the serial handshaking communication?
I start the serial using
Serial3.begin(115200);
Thank you in advance
To activate the RTS and CTS lines, you'll need to enable them in the hardware before using Serial3.begin(115200);
The enable bits are found in the CR3 register of the USART devices, and are already predefined for your use. Please ensure that the pinModes of CTS and RTS are set up for it to work. To enable RTS and CTS, use this code in start up:
pinMode(RTS_PIN, OUTPUT);
pinMode(CTS_PIN, INPUT);
USART3->regs->CR3 = (USART_CR3_CTSE | USART_CR3_RTSE);
Serial3.begin(115200);
Just a note, this code is untested, but I believe it should work. You will need to define the CTS and RTS pins or replace those in the pinMode lines.
paco_espinola
Member
There is no definition for RTS_PIN or someting similar.
At maple.h there are:
#define BOARD_USART1_TX_PIN 7
#define BOARD_USART1_RX_PIN 8
#define BOARD_USART2_TX_PIN 1
#define BOARD_USART2_RX_PIN 0
#define BOARD_USART3_TX_PIN 29
#define BOARD_USART3_RX_PIN 30
So I am going to add someting similar like
#define BOARD_USART3_RTS_PIN 33
Do I change someting in USART3->regs->CR3 = (USART_CR3_CTSE | USART_CR3_RTSE) ?
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