console.cpp
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#include <ion.h>
#include "console.h"
/* This file implements a serial console.
* We use a 115200 8N1 serial port */
namespace Ion {
namespace Console {
char readChar() {
while (Device::UARTPort.SR()->getRXNE() == 0) {
}
return (char)Device::UARTPort.DR()->get();
}
void writeChar(char c) {
while (Device::UARTPort.SR()->getTXE() == 0) {
}
Device::UARTPort.DR()->set(c);
}
}
}
namespace Ion {
namespace Console {
namespace Device {
void init() {
RCC.APB1ENR()->setUSART3EN(true);
for(const GPIOPin & g : Pins) {
g.group().MODER()->setMode(g.pin(), GPIO::MODER::Mode::AlternateFunction);
g.group().AFR()->setAlternateFunction(g.pin(), GPIO::AFR::AlternateFunction::AF7);
}
UARTPort.CR1()->setUE(true);
UARTPort.CR1()->setTE(true);
UARTPort.CR1()->setRE(true);
/* We need to set the baud rate of the UART port.
* This is set relative to the APB1 clock, which runs at 48 MHz.
*
* The baud rate is set by the following equation:
* BaudRate = fAPB1/(16*USARTDIV), where USARTDIV is a divider.
* In other words, USARDFIV = fAPB1/(16*BaudRate). All frequencies in Hz.
*
* In our case, fAPB1 = 48 MHz, so USARTDIV = 26.0416667
* DIV_MANTISSA = 26
* DIV_FRAC = 16*0.0416667 = 1
*/
UARTPort.BRR()->setDIV_MANTISSA(26);
UARTPort.BRR()->setDIV_FRAC(1);
}
void shutdown() {
for(const GPIOPin & g : Pins) {
g.group().MODER()->setMode(g.pin(), GPIO::MODER::Mode::Analog);
g.group().PUPDR()->setPull(g.pin(), GPIO::PUPDR::Pull::None);
}
}
bool peerConnected() {
RxPin.group().PUPDR()->setPull(RxPin.pin(), GPIO::PUPDR::Pull::Down);
RxPin.group().MODER()->setMode(RxPin.pin(), GPIO::MODER::Mode::Input);
msleep(1);
bool result = RxPin.group().IDR()->get(RxPin.pin());
RxPin.group().PUPDR()->setPull(RxPin.pin(), GPIO::PUPDR::Pull::None);
RxPin.group().MODER()->setMode(RxPin.pin(), GPIO::MODER::Mode::AlternateFunction);
return result;
}
}
}
}