You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
5.0 KiB
C
124 lines
5.0 KiB
C
/*============================================================================
|
|
* ET: embedded test; BSP for STM32 NUCLEO-C031C6
|
|
*
|
|
* Q u a n t u m L e a P s
|
|
* ------------------------
|
|
* Modern Embedded Software
|
|
*
|
|
* Copyright (C) 2005 Quantum Leaps, <state-machine.com>.
|
|
*
|
|
* SPDX-License-Identifier: MIT
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
============================================================================*/
|
|
#include "et.h" /* ET: embedded test */
|
|
|
|
#include "stm32c0xx.h" /* CMSIS-compliant header file for the MCU used */
|
|
/* add other drivers if necessary... */
|
|
|
|
/* Local-scope objects -----------------------------------------------------*/
|
|
/* LED pins available on the board (just one user LED LD2--Green on PA.5) */
|
|
#define LD4_PIN 5U
|
|
|
|
/* USART2 pins PA.2 and PA.3 */
|
|
#define USART2_TX_PIN 2U
|
|
#define USART2_RX_PIN 3U
|
|
|
|
/* Button pins available on the board (just one user Button B1 on PC.13) */
|
|
#define B1_PIN 13U
|
|
|
|
/* USART2 for ET output */
|
|
#define UART_DIV_SAMPLING16(__PCLK__, __BAUD__, __CLOCKPRESCALER__) \
|
|
((((__PCLK__)/UARTPrescTable[(__CLOCKPRESCALER__)]) \
|
|
+ ((__BAUD__)/2U)) / (__BAUD__))
|
|
|
|
static uint16_t const UARTPrescTable[12] = {
|
|
1U, 2U, 4U, 6U, 8U, 10U, 12U, 16U, 32U, 64U, 128U, 256U
|
|
};
|
|
|
|
|
|
/*..........................................................................*/
|
|
void ET_onInit(int argc, char *argv[]) {
|
|
(void)argc;
|
|
(void)argv;
|
|
|
|
/* NOTE: SystemInit() has been already called from the startup code
|
|
* but SystemCoreClock needs to be updated
|
|
*/
|
|
SystemCoreClockUpdate();
|
|
|
|
/* enable GPIOA clock port for the LD4 User LED */
|
|
RCC->IOPENR |= (1U << 0U);
|
|
|
|
/* configure LD4 pin as push-pull output, no pull-up, pull-down */
|
|
GPIOA->MODER &= ~((3U << 2U*LD4_PIN));
|
|
GPIOA->MODER |= ((1U << 2U*LD4_PIN));
|
|
GPIOA->OTYPER &= ~((1U << LD4_PIN));
|
|
GPIOA->OSPEEDR &= ~((3U << 2U*LD4_PIN));
|
|
GPIOA->OSPEEDR |= ((1U << 2U*LD4_PIN));
|
|
GPIOA->PUPDR &= ~((3U << 2U*LD4_PIN));
|
|
|
|
/* enable peripheral clock for USART2 */
|
|
RCC->APBENR1 |= (1U << 17U); /* enable USART#2 clock */
|
|
RCC->IOPENR |= (1U << 0U); /* enable GPIOA clock for UART pins */
|
|
|
|
/* Configure PA3 to USART2_RX, PA2 to USART2_TX */
|
|
GPIOA->AFR[0] &= ~((15U << 4U*USART2_RX_PIN) | (15U << 4U*USART2_TX_PIN));
|
|
GPIOA->AFR[0] |= (( 1U << 4U*USART2_RX_PIN) | ( 1U << 4U*USART2_TX_PIN));
|
|
GPIOA->MODER &= ~(( 3U << 2U*USART2_RX_PIN) | ( 3U << 2U*USART2_TX_PIN));
|
|
GPIOA->MODER |= (( 2U << 2U*USART2_RX_PIN) | ( 2U << 2U*USART2_TX_PIN));
|
|
GPIOA->OSPEEDR&= ~(( 3U << 2U*USART2_RX_PIN) | ( 3U << 2U*USART2_TX_PIN));
|
|
GPIOA->OTYPER &= ~(( 1U << USART2_RX_PIN) | ( 1U << USART2_TX_PIN));
|
|
GPIOA->PUPDR &= ~(( 3U << 2U*USART2_RX_PIN) | ( 3U << 2U*USART2_TX_PIN));
|
|
GPIOA->PUPDR |= (( 1U << 2U*USART2_RX_PIN) | ( 1U << 2U*USART2_TX_PIN));
|
|
|
|
USART2->BRR = UART_DIV_SAMPLING16(SystemCoreClock, 115200U, 0U);
|
|
USART2->CR1 = USART_CR1_TE_Msk | USART_CR1_RE_Msk
|
|
| USART_CR1_RXNEIE_RXFNEIE_Msk
|
|
| USART_CR1_UE_Msk;
|
|
USART2->CR2 = 0x00000000U;
|
|
USART2->CR3 = 0x00000000U;
|
|
}
|
|
/*..........................................................................*/
|
|
void ET_onPrintChar(char const ch) {
|
|
while ((USART2->ISR & (1U << 7U)) == 0U) { /* while TXE not empty */
|
|
}
|
|
USART2->TDR = ch; /* put ch into the DR register */
|
|
}
|
|
/*..........................................................................*/
|
|
void ET_onExit(int err) {
|
|
(void)err;
|
|
/* blink the on-board LED2... */
|
|
for (;;) {
|
|
unsigned volatile ctr;
|
|
GPIOA->BSRR = (1U << LD4_PIN); /* LED2 on */
|
|
for (ctr = 100000U; ctr != 0U; --ctr) {}
|
|
GPIOA->BSRR = (1U << (LD4_PIN + 16U)); /* LED2 off */
|
|
for (ctr = 200000U; ctr != 0U; --ctr) {}
|
|
}
|
|
}
|
|
|
|
/*..........................................................................*/
|
|
/* fault handler called from the exception handlers in the startup code */
|
|
void assert_failed(char const * const module, int const loc) {
|
|
(void)module;
|
|
(void)loc;
|
|
ET_onExit(-1);
|
|
}
|