Diff: mbed-dev-master/targets/TARGET_STM/mbed_crc_api.c

Revision:

0:bb348c97df44

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev-master/targets/TARGET_STM/mbed_crc_api.c	Wed Sep 16 01:11:49 2020 +0000
@@ -0,0 +1,70 @@
+#include "crc_api.h"
+#include "device.h"
+
+#include "platform/mbed_assert.h"
+
+#ifdef DEVICE_CRC
+
+static CRC_HandleTypeDef current_state;
+static uint32_t final_xor;
+
+bool hal_crc_is_supported(const crc_mbed_config_t *config)
+{
+    if (config == NULL) {
+        return false;
+    }
+
+    if (config->polynomial != POLY_32BIT_ANSI) {
+        return false;
+    }
+
+    if (config->width != 32) {
+        return false;
+    }
+
+    if ((config->final_xor != 0xFFFFFFFFU) && (config->final_xor != 0)) {
+        return false;
+    }
+
+    return true;
+}
+
+void hal_crc_compute_partial_start(const crc_mbed_config_t *config)
+{
+    MBED_ASSERT(hal_crc_is_supported(config));
+
+    __HAL_RCC_CRC_CLK_ENABLE();
+
+    final_xor = config->final_xor;
+
+    current_state.Instance                     = CRC;
+    current_state.InputDataFormat              = CRC_INPUTDATA_FORMAT_BYTES;
+    current_state.Init.DefaultPolynomialUse    = DEFAULT_POLYNOMIAL_ENABLE;
+    current_state.Init.DefaultInitValueUse     = DEFAULT_INIT_VALUE_DISABLE;
+    current_state.Init.InitValue               = config->initial_xor;
+    current_state.Init.CRCLength               = CRC_POLYLENGTH_32B;
+    current_state.Init.InputDataInversionMode  =
+        config->reflect_in ? CRC_INPUTDATA_INVERSION_BYTE
+        : CRC_INPUTDATA_INVERSION_NONE;
+    current_state.Init.OutputDataInversionMode =
+        config->reflect_out ? CRC_OUTPUTDATA_INVERSION_ENABLE
+        : CRC_OUTPUTDATA_INVERSION_DISABLE;
+
+    HAL_CRC_Init(&current_state);
+}
+
+void hal_crc_compute_partial(const uint8_t *data, const size_t size)
+{
+    if (data && size) {
+        HAL_CRC_Accumulate(&current_state, (uint32_t *)data, size);
+    }
+}
+
+uint32_t hal_crc_get_result(void)
+{
+    const uint32_t result = current_state.Instance->DR;
+
+    return (final_xor == 0xFFFFFFFFU) ? ~result : result;
+}
+
+#endif // DEVICE_CRC