From 4ce09995e336103ab1d6e20171e732bba1b4cfb2 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Sun, 20 Dec 2015 15:33:38 +0100
Subject: o Switching from the original tinyprintf to an improved version. o
 Creating a cmake library out of tinyprintf.

---
 serial2.cpp | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 serial2.cpp

(limited to 'serial2.cpp')

diff --git a/serial2.cpp b/serial2.cpp
new file mode 100644
index 0000000..58ea536
--- /dev/null
+++ b/serial2.cpp
@@ -0,0 +1,131 @@
+#include "tinyprintf.h"
+#include <stdint.h>
+#include <stm32f10x.h>
+#include <stm32f10x_rcc.h>
+#include <stm32f10x_gpio.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include "tinyprintf.h"
+#include "debug.h"
+
+int init_high();
+
+extern "C" void halt();
+
+#include "stm32f10x_conf.h"
+
+extern "C"
+__attribute__((naked))
+void HardFault_Handler_C(uint32_t *hardfault_args) {
+    halt();
+}
+
+size_t strlen(const char *s) {
+    size_t size = 0;
+    while (*s++ != '\0') size++;
+    return size;
+}
+
+int run = 1;
+
+volatile USART_TypeDef *usart1 = (volatile USART_TypeDef *) USART1_BASE;
+
+/*
+ * When we get there the stack pointer is set
+ */
+int main() {
+    SystemInit();
+
+    init_printf(nullptr, dbg_putc);
+
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO
+                           | RCC_APB2Periph_USART1
+                           | RCC_APB2Periph_GPIOA
+                           | RCC_APB2Periph_GPIOB
+                           | RCC_APB2Periph_GPIOC,
+                           ENABLE);
+
+    /* ***************************************** */
+
+    // Debug on port B
+
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, ENABLE);
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, DISABLE);
+
+    // Make Port B's pin #5 the debug output pin
+    GPIO_InitTypeDef init;
+    GPIO_StructInit(&init);
+    init.GPIO_Pin = GPIO_Pin_5;
+    init.GPIO_Mode = GPIO_Mode_Out_PP;
+    GPIO_Init(GPIOB, &init);
+
+    /* ***************************************** */
+
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, ENABLE);
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, DISABLE);
+
+    /*
+     * PA9	USART1_TX
+     * PA10	USART1_RX
+     */
+
+    // Enable USART1
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
+
+    // Make the TX pin an output
+    GPIO_StructInit(&init);
+    init.GPIO_Pin = GPIO_Pin_9;
+    init.GPIO_Mode = GPIO_Mode_AF_PP;
+    GPIO_Init(GPIOA, &init);
+
+    // 8 bit mode
+    USART1->CR1 &= ~USART_CR1_M;
+    USART1->CR2 &= ~USART_CR2_STOP_1;
+
+    USART1->CR1 |= USART_CR1_UE /* Set UART Enable */
+                   | USART_CR1_TE; /* Set Transmission Enable */
+
+    // Set baud rate
+    int mantissa = 39;
+    int fraction = static_cast<int>(16 * 0.0625); // == 1
+    // 72M / (16*39.0625) = 115200
+    USART1->BRR = static_cast<uint16_t >(mantissa << 4 | fraction);
+
+    char c = 'A';
+    while (run) {
+        int txe = USART1->SR & USART_SR_TXE;
+
+//        dbg_printf("1:%d?\n", x);
+
+//        char mm[100];
+//        tfp_sprintf(mm, "2:%d?\n", x);
+//        send_command(SYS_WRITE0, mm);
+
+//        printf(" %u?\n", usart1->SR);
+//        printf(" %u?\n", 1);
+
+        if (txe) {
+            GPIO_SetBits(GPIOB, GPIO_Pin_All);
+            GPIO_ResetBits(GPIOB, GPIO_Pin_All);
+
+            USART1->DR = (uint16_t) c;
+//            USART1->DR = 0x55;
+
+            if (c == 'Z') {
+                c = 'a';
+            } else if (c == 'z') {
+                c = '0';
+            } else if (c == '9') {
+                c = '\n';
+            } else if (c == '\n') {
+                c = 'A';
+            } else {
+                c++;
+            }
+        }
+    }
+
+    return 0;
+}
+
-- 
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