EMTime/libopencm3-examples
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Added some comments and deleted unimportant function

Browse Source
This commit is contained in:
millerd
2013-04-24 17:39:26 +02:00
committed by Piotr Esden-Tempski
parent 76ebdb86cd
commit 76cdc22896
1 changed files with 19 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
examples/stm32/f1/stm32-h107/flash_rw_example/flash_rw_example.c
View File

@@ -38,10 +38,9 @@ static void usart_send_string(u32 usart, u8 *string, u16 str_size);
static void usart_get_string(u32 usart, u8 *string, u16 str_max_size);
/*flash operations*/
static u32 flash_program_data(u32 start_address, u8 *input_data, u16 num_elements);
static void flash_read_data(u32 start_address, u16 num_elements, u8 *out_string);
static void flash_read_data(u32 start_address, u16 num_elements, u8 *output_data);
/*local functions to work with strings*/
static u16 local_strlen(u8 *string);
static void local_atol_hex(u32 value, u8 *out_string);
static void local_ltoa_hex(u32 value, u8 *out_string);
int main(void)
{
@@ -52,28 +51,28 @@ int main(void)
while(1)
{
usart_send_string(USART1, (u8*)"Please enter string to write into Flash memory:\n\r", local_strlen((u8*)"Please enter string to write into Flash memory:\n\r"));
usart_send_string(USART1, (u8*)"Please enter string to write into Flash memory:\n\r", SEND_BUFFER_SIZE);
usart_get_string(USART1, str_send, SEND_BUFFER_SIZE);
result = flash_program_data(FLASH_OPERATION_ADDRESS, str_send, local_strlen(str_send));
result = flash_program_data(FLASH_OPERATION_ADDRESS, str_send, SEND_BUFFER_SIZE);
switch(result)
{
case RESULT_OK: /*everything ok*/
usart_send_string(USART1, (u8*)"Verification of written data: ", local_strlen((u8*)"Verification of written data: "));
usart_send_string(USART1, (u8*)"Verification of written data: ", SEND_BUFFER_SIZE);
flash_read_data(FLASH_OPERATION_ADDRESS, SEND_BUFFER_SIZE, str_verify);
usart_send_string(USART1, str_verify, local_strlen(str_verify));
usart_send_string(USART1, str_verify, SEND_BUFFER_SIZE);
break;
case FLASH_WRONG_DATA_WRITTEN: /*data read from Flash is different than written data*/
usart_send_string(USART1, (u8*)"Wrong data written into flash memory", SEND_BUFFER_SIZE);
break;
default: /*wrong flags' values in Flash Status Register (FLASH_SR)*/
usart_send_string(USART1, (u8*)"Wrong value of FLASH_SR: ", SEND_BUFFER_SIZE);
local_atol_hex(result, str_send);
local_ltoa_hex(result, str_send);
usart_send_string(USART1, str_send, SEND_BUFFER_SIZE);
break;
}
usart_send_string(USART1, (u8*)"\r\n", local_strlen((u8*)"\r\n"));
/*send end_of_line*/
usart_send_string(USART1, (u8*)"\r\n", 3);
}
return 0;
}
@@ -141,27 +140,32 @@ static u32 flash_program_data(u32 start_address, u8 *input_data, u16 num_element
u32 page_address = start_address;
u32 flash_status = 0;
/*check if start_address is in proper range*/
if((start_address - FLASH_BASE) >= (FLASH_PAGE_SIZE * (FLASH_PAGE_NUM_MAX+1)))
return 1;
/*calculate current page address*/
if(start_address % FLASH_PAGE_SIZE)
page_address -= (start_address % FLASH_PAGE_SIZE);
flash_unlock();
/*Erasing page*/
flash_erase_page(page_address);
flash_status = flash_get_status_flags();
if(flash_status != FLASH_SR_EOP)
return flash_status;
/*programming flash memory*/
for(iter=0; iter<num_elements; iter += 4)
{
/*programming word data*/
flash_program_word(current_address+iter, *((u32*)(input_data + iter)));
flash_status = flash_get_status_flags();
if(flash_status != FLASH_SR_EOP)
return flash_status;
/*verify if correct data is programmed*/
if(*((u32*)(current_address+iter)) != *((u32*)(input_data + iter)))
return FLASH_WRONG_DATA_WRITTEN;
}
@@ -169,28 +173,19 @@ static u32 flash_program_data(u32 start_address, u8 *input_data, u16 num_element
return 0;
}
static void flash_read_data(u32 start_address, u16 num_elements, u8 *out_string)
static void flash_read_data(u32 start_address, u16 num_elements, u8 *output_data)
{
u16 iter;
u32 *memory_ptr= (u32*)start_address;
for(iter=0; iter<num_elements/4; iter++)
{
*(u32*)out_string = *(memory_ptr + iter);
out_string += 4;
*(u32*)output_data = *(memory_ptr + iter);
output_data += 4;
}
}
static u16 local_strlen(u8 *string)
{
u16 iter = 0;
while(string[iter++] != 0);
return iter;
}
static void local_atol_hex(u32 value, u8 *out_string)
static void local_ltoa_hex(u32 value, u8 *out_string)
{
u8 iter;