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stk3700.c
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stk3700.c
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/**
* Copyright © 2022 Stuart Maclean
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER NOR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include <stdio.h>
#include "em_cmu.h"
#include "em_gpio.h"
#include "em_usart.h"
/**
* @author Stuart Maclean
*
* Helper for fault handling api test cases that run on a SiliconLabs
* stk3700 starter kit board. That board contains a GiantGecko CPU, a
* CM3.
*
* https://www.silabs.com/development-tools/mcu/32-bit/efm32gg-starter-kit?tab=overview
* Here we provide TWO routines for test cases:
* initConsole() - set up the CMU, GPIO and USART peripherals such
* that USART1 is pinned out to the stk3700's Expansion Header on pins
* 4 (Tx) and 6 (Rx). We are viewing that uart as the 'serial console'
* of that board.
*
* On the STK3700, Expansion Header pin 4 (USART1 Tx) is PD0 while pin
* 6 (USART1 Rx) is PD1. These pins are route/location 1 for that
* USART. See the STK3700 data sheet.
*
* consoleWrite( char* s ) - write a supplied string to the serial console.
*
* Hook up a ttl-usb cable to your host, and open
* e.g. minicom/teraterm (or just cat!) at 115200 baud, 8N1, and see
* any output written by the stk3700's consoleWrite routine.
*
* $ stty -F /dev/ttyXXX 115200 -echo
* $ cat /dev/ttyXXX
*/
/**
* Prepare the stk3700's cmu, gpio and usart peripherals so that we
* have a 'serial console' to which we can write a fault dump when one
* occurs. This is all typical emlib stuff.
*/
void initConsole(void) {
CMU_OscillatorEnable( cmuOsc_HFXO, true, true );
CMU_ClockSelectSet( cmuClock_HF, cmuSelect_HFXO );
// USART1#1 = Tx - D1, Rx - D0
CMU_ClockEnable( cmuClock_GPIO, true );
GPIO_PinModeSet( gpioPortD, 0, gpioModePushPull, 1 );
GPIO_PinModeSet( gpioPortD, 1, gpioModeInput, 0 );
CMU_ClockEnable( cmuClock_USART1, true );
// At 48MHz (HFXO), oversampling of 6 gives lowest baud rate error for 115200
USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT;
init.oversampling = usartOVS6;
init.enable = usartDisable;
/*
USART_InitAsync calls USART_Reset, which resets the ROUTE register.
So, do the ROUTE setup AFTER the Init call.
*/
USART_InitAsync( USART1, &init );
USART1->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN |
USART_ROUTE_LOCATION_LOC1;
USART_Enable( USART1, usartEnable );
}
/**
* Write null-terminated string @p s to the stk3700 'serial console',
* defined by us to be USART1.
*/
void consoleWrite( char* s ) {
char* cp = s;
while( *cp ) {
USART_Tx( USART1, *cp );
cp++;
}
}
// eof