SDCardBlockDevice: fix signed/unsigned comparison

Author: pennam

libraries/BlockDevices/SDCardBlockDevice.cpp

@@ -367,8 +367,8 @@ int SDCardBlockDevice::read(void *buffer, bd_addr_t add, bd_size_t _size) {
          uint32_t num_of_blocks = (_size / read_block_size);
          uint32_t start_add_of_block = (add / read_block_size);
          rv = FSP_SUCCESS;
-         for(int i = 0; i < num_of_blocks && rv == FSP_SUCCESS; i++) {
-            rv = R_SDHI_Read (&ctrl, (uint8_t *)(buffer + (i * read_block_size)), start_add_of_block + i, 1);
+         for(uint32_t i = 0; i < num_of_blocks && rv == FSP_SUCCESS; i++) {
+            rv = R_SDHI_Read (&ctrl, (uint8_t *)((uint8_t *)buffer + (i * read_block_size)), start_add_of_block + i, 1);
             if(rv == FSP_SUCCESS) {
                rv = wait_for_completition();
             }
@@ -403,8 +403,8 @@ int SDCardBlockDevice::write(const void *buffer, bd_addr_t add, bd_size_t _size)
          uint32_t num_of_blocks = (_size / write_block_size);
          uint32_t start_block_number = (add / write_block_size);
          rv = FSP_SUCCESS;
-         for(int i = 0; i < num_of_blocks && rv == FSP_SUCCESS; i++) {
-            rv = R_SDHI_Write (&ctrl, (uint8_t *)(buffer + (i * write_block_size)), start_block_number + i, 1);
+         for(uint32_t i = 0; i < num_of_blocks && rv == FSP_SUCCESS; i++) {
+            rv = R_SDHI_Write (&ctrl, (uint8_t *)((uint8_t *)buffer + (i * write_block_size)), start_block_number + i, 1);
             if(rv == FSP_SUCCESS) {
                rv = wait_for_completition();
             }
@@ -438,7 +438,7 @@ int SDCardBlockDevice::erase(bd_addr_t add, bd_size_t _size) {
          uint32_t num_of_blocks = (_size / erase_block_size);
          uint32_t start_block_number = (add / erase_block_size);
          rv = FSP_SUCCESS;
-         for(int i = 0; i < num_of_blocks && rv == FSP_SUCCESS; i++) {
+         for(uint32_t i = 0; i < num_of_blocks && rv == FSP_SUCCESS; i++) {
             rv = R_SDHI_Erase (&ctrl, start_block_number + i, 1);
             if(rv == FSP_SUCCESS) {
                rv = wait_for_completition();