From e8c6f2b8aa1bd65bfe8d431ecf7358f12f5bf981 Mon Sep 17 00:00:00 2001
From: Fredrik Thulin <fredrik@thulin.net>
Date: Thu, 10 Dec 2015 21:23:45 +0100
Subject: init, code testing the RTC on the dev-bridge board

---
 src/rtc-test/src/stm-uart.c | 109 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/rtc-test/src/stm-uart.c

(limited to 'src/rtc-test/src/stm-uart.c')

diff --git a/src/rtc-test/src/stm-uart.c b/src/rtc-test/src/stm-uart.c
new file mode 100644
index 0000000..c98a889
--- /dev/null
+++ b/src/rtc-test/src/stm-uart.c
@@ -0,0 +1,109 @@
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f4xx_hal.h"
+#include "stm-uart.h"
+
+#include <string.h>
+
+extern void Error_Handler();
+
+UART_HandleTypeDef huart2;
+
+
+/* Private variables ---------------------------------------------------------*/
+
+/* Private function prototypes -----------------------------------------------*/
+
+inline void uart_putc(uint8_t *ch) {
+  HAL_UART_Transmit(&huart2, ch, 1, 0x1);
+}
+
+void uart_send_binary(uint32_t num, uint8_t bits)
+{
+  uint32_t i;
+  unsigned char ch;
+
+  bits--;  /* bits 4 should give i = 1000, not 10000 */
+
+  i = 1 << bits;
+  while (i) {
+    ch = '0';
+    if (num & i) {
+      ch = '1';
+    }
+
+    uart_putc(&ch);
+    i = i >> 1;
+  }
+}
+
+void uart_send_string(char *s)
+{
+  HAL_UART_Transmit(&huart2, (uint8_t *) s, strlen(s), 0x1);
+}
+
+void uart_send_integer(uint32_t data, uint32_t mag) {
+  uint32_t i, t;
+  unsigned char ch;
+
+  if (! mag) {
+    /* Find magnitude */
+    if (data < 10) {
+      ch = '0' + data;
+      HAL_UART_Transmit(&huart2, (uint8_t *) &ch, 1, 0x1);
+      return;
+    }
+
+    for (mag = 10; mag < data; mag = i) {
+      i = mag * 10;
+      if (i > data || i < mag)
+        break;
+    }
+  }
+  /* mag is now 10 if data is 45, and 1000 if data is 1009 */
+  for (i = mag; i; i /= 10) {
+    t = (data / i);
+    ch = '0' + t;
+    HAL_UART_Transmit(&huart2, (uint8_t *) &ch, 1, 0x1);
+    data -= (t * i);
+  }
+}
+
+void uart_send_hexbyte(const uint32_t data)
+{
+  int i, j = 8;
+  uint8_t ch;
+
+  while (j) {
+    j -= 4;
+    i = (data >> j) & 0x0f;
+    if (i > 9) {
+      ch = 'a' + i - 10;
+      uart_putc(&ch);
+    } else {
+      ch = '0' + i;
+      uart_putc(&ch);
+    }
+  }
+}
+
+void uart_send_hexdump(const uint8_t *buf, const uint8_t start_offset, const uint8_t end_offset)
+{
+  uint32_t i;
+
+  uart_send_string("00 -- ");
+
+  for (i = 0; i <= end_offset; i++) {
+    if (i && (! (i % 16))) {
+      uart_send_string("\r\n");
+
+      if (i != end_offset) {
+	/* Output new offset unless the last byte is reached */
+	uart_send_hexbyte(i);
+	uart_send_string(" -- ");
+      }
+    }
+
+    uart_send_hexbyte(*(buf + i));
+    uart_send_string(" ");
+  }
+}
-- 
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