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Pass ISO7816_GetChar return val to higher layers

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The return value of ISO7816_GetChar is 0 in case of a timeout
when trying to retrieve values, and status of US_CSR otherwise.

Proper handling of this return value is not yet implemented though.
With the naive approach of just not sending the ATR if it could not
be read the simtrace firmware did not work together with pcsc_scan
AT ALL.
This commit is contained in:
Christina Quast
2015-01-15 14:53:38 +01:00
parent 99de4e5753
commit 8d0f4a6675
3 changed files with 19 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
sam3s_example/atmel_softpack_libraries/libboard_sam3s-ek/source/iso7816_4.c
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@@ -93,14 +93,11 @@ static uint32_t ISO7816_GetChar( uint8_t *pCharToReceive )
/* Wait USART ready for reception */
while( ((BOARD_ISO7816_BASE_USART->US_CSR & US_CSR_RXRDY) == 0) ) {
if(timeout++ > 12000 * (BOARD_MCK/1000000)) {
TRACE_DEBUG("TimeOut\n\r");
TRACE_WARN("TimeOut\n\r");
return( 0 );
}
}
TRACE_DEBUG("T: %u\n\r", timeout);
/* At least one complete character has been received and US_RHR has not yet been read. */
/* Get a char */
@@ -359,17 +356,24 @@ void ISO7816_toAPDU( void )
* Answer To Reset (ATR)
* \param pAtr ATR buffer
* \param pLength Pointer for store the ATR length
* \return 0: if timeout else status of US_CSR
*/
void ISO7816_Datablock_ATR( uint8_t* pAtr, uint8_t* pLength )
uint32_t ISO7816_Datablock_ATR( uint8_t* pAtr, uint8_t* pLength )
{
uint32_t i;
uint32_t j;
uint32_t y;
uint32_t status = 0;
*pLength = 0;
/* Read ATR TS */
ISO7816_GetChar(&pAtr[0]);
// FIXME: There should always be a check for the GetChar return value..0 means timeout
status = ISO7816_GetChar(&pAtr[0]);
/* if (status == 0) {
return status;
}*/
/* Read ATR T0 */
ISO7816_GetChar(&pAtr[1]);
y = pAtr[1] & 0xF0;