crc32 passed smoke test

libraries/ms-common/inc/crc32.h

@@ -1,15 +1,13 @@
 #pragma once
 
-#include "FreeRTOS.h"
-#include "status.h"
 #include <stddef.h>
 #include <stdint.h>
 
+#include "FreeRTOS.h"
+#include "status.h"
+
 // Initialize CRC calculation (no use for STM32F1)
-StatusCode crc32_init(void);
+StatusCode crc_init(void);
 
 // Calculate CRC32 for an entire buffer
-uint32_t crc32_arr(const uint8_t *buffer, size_t buffer_len);
-
-// Incremental CRC32 calculation
-uint32_t crc32_append_arr(const uint8_t *buffer, size_t buffer_len, uint32_t initial_crc);
+uint32_t crc_calculate(const uint32_t *buffer, size_t buffer_len);

libraries/ms-common/src/arm/crc32.c

@@ -0,0 +1,29 @@
+#include "crc32.h"  // Include the header file for CRC32 function declarations
+
+#include "log.h"  // Include the logging utility, possibly used for debugging or status messages
+#include "misc.h"
+#include "stm32f10x.h"  // Include the STM32F1 series specific header file for hardware definitions
+#include "stm32f10x_crc.h"  // Include the CRC library header
+
+// Initialization function for CRC
+StatusCode crc_init(void) {
+  // Enable the CRC peripheral clock
+  RCC->AHBENR |= RCC_AHBENR_CRCEN;
+
+  // Reset CRC Data Register
+  CRC_ResetDR();
+
+  return STATUS_CODE_OK;  // Return OK status
+}
+
+// Function to calculate CRC32 for a given buffer, with an option to append to an existing CRC
+uint32_t crc_calculate(const uint32_t *buffer, size_t buffer_len) {
+  CRC_ResetDR();  // Reset the CRC Data Register
+
+  // Process each byte in the buffer
+  for (size_t i = 0; i < buffer_len; i++) {
+    CRC_CalcCRC(buffer[i]);  // Calculate CRC for each byte
+  }
+
+  return ~CRC_GetCRC();  // Return the inverted final CRC value
+}

libraries/ms-common/src/x86/crc32.c

@@ -0,0 +1,41 @@
+#include "crc32.h"  // Include the header file for CRC32 function declarations
+
+#include "log.h"  // Include the logging utility, possibly used for debugging or status messages
+#include "misc.h"
+#include "stm32f10x.h"  // Include the STM32F1 series specific header file for hardware definitions
+#include "stm32f10x_crc.h"  // Include the CRC library header
+
+// Define the CRC32 polynomial and initial value
+#define CRC32_POLYNOMIAL \
+  0x04C11DB7  // Standard CRC32 polynomial (used in many protocols and formats)
+#define CRC32_INIT_VALUE 0xFFFFFFFF  // Initial value used to start the CRC calculation
+
+static uint32_t crc32_calculate_byte(uint32_t crc, uint32_t data) {
+  crc ^= data;  // XOR the word directly into the CRC value
+
+  // Perform the polynomial division one bit at a time for each of the 32 bits
+  for (int i = 0; i < 32; i++) {
+    if (crc & 0x80000000) {                 // If the top bit is set (MSB is 1)
+      crc = (crc << 1) ^ CRC32_POLYNOMIAL;  // Shift left and XOR with the polynomial
+    } else {
+      crc <<= 1;  // Just shift left if the top bit is not set
+    }
+  }
+  return crc;  // Return the updated CRC value after processing the word
+}
+
+uint32_t crc_calculate(const uint32_t *buffer, size_t buffer_len) {
+  uint32_t crc = ~0;  // Initialize CRC with the inverted initial value (standard practice)
+
+  // Process each byte in the buffer
+  for (size_t i = 0; i < buffer_len; i++) {
+    crc = crc32_calculate_byte(crc, buffer[i]);  // Update CRC for each byte
+  }
+
+  return ~crc;  // Return the inverted CRC32 value (final CRC value needs to be inverted)
+}
+
+// no use for x86
+StatusCode crc_init(void) {
+  return STATUS_CODE_OK;
+}