added bootstrap.c/.h

Library/SPL/stm8s.h

@@ -240,6 +240,9 @@ typedef uint8_t u8;
 typedef enum {
 	FALSE = 0, TRUE = !FALSE
 } bool;
+//#include <stdbool.h>
+//#define TRUE true
+//#define FALSE false
 
 typedef enum {
 	RESET = 0, SET = !RESET

User/bootstrap.c

@@ -0,0 +1,85 @@
+//
+// Created by MightyPork on 2017/02/10.
+//
+
+#include <stm8s.h>
+#include "bootstrap.h"
+
+/** Global time base */
+volatile uint32_t time_ms;
+
+/**
+ * Putchar for printf
+ * @param c - char to print
+ */
+void putchar(char c)
+{
+	while ((UART1->SR & UART1_SR_TXE) == 0);
+	UART1->DR = (u8)c;
+}
+
+/**
+ * Init for the chinese STM8 board
+ * - enable LED
+ * - enable UART @ 115200
+ * - set up UART rx irq
+ */
+void SimpleInit(void)
+{
+	// Disable default div/8 HSI prescaller
+	CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
+
+	// LED
+	GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_PP_HIGH_FAST);
+
+	// UART init & enable IRQ
+	UART_SimpleInit(UART_BAUD_115200);
+	UART1_ITConfig(UART1_IT_RXNE_OR, ENABLE);
+
+	// Timebase generation counter
+	TIM4_UpdateRequestConfig(TIM4_UPDATESOURCE_REGULAR);
+	TIM4_PrescalerConfig(TIM4_PRESCALER_128, TIM4_PSCRELOADMODE_IMMEDIATE);
+	TIM4_SetAutoreload(0xFF);
+	TIM4_ARRPreloadConfig(ENABLE);
+	TIM4_ITConfig(TIM4_IT_UPDATE, ENABLE);
+	TIM4_Cmd(ENABLE);
+
+	enableInterrupts();
+}
+
+/**
+ * @brief Timer4 Update/Overflow Interrupt routine.
+ * @param  None
+ * @retval None
+ */
+INTERRUPT_HANDLER(TIM4_UPD_OVF_IRQHandler, 23)
+{
+	time_ms++;
+	TIM4_ClearITPendingBit(TIM4_IT_UPDATE);
+}
+
+/** Delay ms */
+void Delay(uint16_t ms)
+{
+	uint32_t start = time_ms;
+	while ((time_ms - start) < ms);
+}
+
+/**
+ * UART1 RX Interrupt routine.
+ */
+INTERRUPT_HANDLER(UART1_RX_IRQHandler, 18)
+{
+	if (UART1->SR & UART1_SR_RXNE) {
+		UART_HandleRx(UART1->DR);
+	}
+}
+
+// Comment out if custom rx handler is added
+#if 1
+void UART_HandleRx(char c)
+{
+	// echo
+	putchar(c);
+}
+#endif

User/bootstrap.h

@@ -0,0 +1,58 @@
+//
+// Created by MightyPork on 2017/02/10.
+//
+
+#ifndef STM8S_STDINIT_H
+#define STM8S_STDINIT_H
+
+/** Global timebase */
+extern volatile uint32_t time_ms;
+
+/** Uart IRQ handler */
+void UART1_RX_IRQHandler(void) INTERRUPT(18);
+
+/** SysTick handler */
+void TIM4_UPD_OVF_IRQHandler(void) INTERRUPT(23);
+
+/** putchar, used by the SDCC stdlib */
+void putchar(char c);
+
+/**
+ * Simple init (UART, LED, timebase)
+ */
+void SimpleInit(void);
+
+/**
+ * Millisecond delay
+ *
+ * @param ms - nr of milliseconds
+ */
+void Delay(uint16_t ms);
+
+/**
+ * User UART rx handler
+ *
+ * If adding custom handler, comment out the defualt echo impl in bootstrap.c
+ *
+ * @param c
+ */
+extern void UART_HandleRx(char c);
+
+/** Toggle indicator LED */
+inline void LED_Toggle(void)
+{
+	GPIOB->ODR ^= GPIO_PIN_5;
+}
+
+/** Set indicator LED */
+inline void LED_Set(bool state)
+{
+	if (state) {
+		GPIOB->ODR &= ~GPIO_PIN_5;
+	} else {
+		GPIOB->ODR |= GPIO_PIN_5;
+	}
+}
+
+
+#endif //STM8S_DEBUG_H

User/main.c

@@ -1,70 +1,17 @@
 #include "stm8s.h"
-#include <stdlib.h>
+#include <stdio.h>
-
+#include "bootstrap.h"
-void Delay(uint16_t nCount) {
-	uint8_t i;
-	for (; nCount != 0; nCount--) {
-		for (i = 255; i != 0; i--) {}
-	}
-}
-
-void putchar(char c) {
-	while ((UART1->SR & UART1_SR_TXE) == 0);
-	UART1->DR = (u8)c;
-}
-
-void puts(const char *ch) {
-	char c;
-	while ((c = *ch++) != 0)
-		putchar(c);
-}
-
-void puts_itoa(int32_t n, unsigned char radix) {
-	char s[10], i, c;
-	_ltoa(n, s, radix);
-	i = 0;
-	while((c = s[i++]) != 0) {
-		putchar(c);
-	}
-}
 
 void main(void)
 {
-	// Disable div8
+	SimpleInit();
-	CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
-
-	// LED for blinking
-	GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_PP_HIGH_FAST);
-
-	// minimal uart init
-	UART_SimpleInit(UART_BAUD_115200);
-
-	// irq conf
-	UART1_ITConfig(UART1_IT_RXNE_OR, ENABLE);
-	enableInterrupts();
 
-	// Clear screen & print system frequency
+	// clear screen, hide cursor
-	puts("\033c\033[?25lClock freq = "); // cls
+	printf("\033c\033[?25lClock freq = \033[32m%lu Hz\033[0m\r\n", CLK_GetClockFreq());
-	puts_itoa(CLK_GetClockFreq(), 10);
-	puts(" Hz"); // cls
 
-	// echo & blinking
 	while (1) {
-		Delay(2000);
+		LED_Toggle();
-		GPIOB->ODR ^= GPIO_PIN_5;
+		printf("Time = %lu ms\r", time_ms);
+		Delay(500);
 	}
 }
-
-/**
-  * @brief UART1 RX Interrupt routine.
-  * @param  None
-  * @retval None
-  */
-INTERRUPT_HANDLER(UART1_RX_IRQHandler, 18)
-{
-	if (UART1->SR & UART1_SR_RXNE)
-		UART1->DR = (u8) (UART1->DR); // echo
-
-	if (UART1->SR & UART1_SR_OR)
-		UART1->SR &= ~UART1_SR_OR; // clear OR flag
-}