MSM8909平台UIM驱动流程

UIM卡上电需要满足下面的时序。

UIM上电时序 UIM下电时序

MSM8909平台UIM初始化流程如下。

在initialize_intctrl中设置了UART接收数据的中断服务程序为uimIntctrlIsr，当UART的DATA数据线为接收模式时，一旦DATA线上面有数据，uimIntctrlIsr函数就会被调用。

/* Initialize interrupt controller */
void initialize_intctrl(uim_instance_global_type *uim_ptr)
{. . . . . .DalInterruptController_RegisterISR(uim_hw_if.intctrl[uim_instance].m_IntCtrl_handle_ptr,uim_hw_if.intctrl[uim_instance].m_uartIRQNum,(DALISR) uimIntctrlIsr,// 设置UART接收中断服务函数(const DALIRQCtx) uim_ptr,DALINTRCTRL_ENABLE_LEVEL_HIGH_TRIGGER);
. . . . . .
} /* initialize_intctrl */

在uim_initialize_state中，设置UIM的当前工作电压为1.8V，UIM支持的最大电压为3V。

void uim_initialize_state
(uim_instance_global_type *uim_ptr
)
{
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *//* Initialize the uim Rx character ISR processing state. */uim_ptr->rxtx_state_machine.rx_state = UIM_RX_PROCESS_IDLE;if (uim_ptr->hardware.uim_ldo.customize_ldo_setting &&uim_ptr->hardware.uim_ldo.desired_voltage_class != UIM_VOLTAGE_CLASS_INVALID){/* Set the UIM interface voltage to desired voltage class */uim_ptr->state.current_voltage_class = uim_ptr->hardware.uim_ldo.desired_voltage_class;uim_ptr->state.max_possible_voltage_class = uim_ptr->hardware.uim_ldo.desired_voltage_class;}else{/* Set the UIM interface voltage to the minimum voltage class */// 设置UIM的当前电源电压为1.8Vuim_ptr->state.current_voltage_class = UIM_VOLTAGE_CLASS_C;// 设置UIM支持的最大电压为3Vuim_ptr->state.max_possible_voltage_class = UIM_VOLTAGE_CLASS_B;}
} /* uim_initialize_state */

UIM_VOLTAGE_CLASS_C和UIM_VOLTAGE_CLASS_B在modem_proc\uim\uimdrv\src\uimdrv.h中定义。

/* The enum type describes the voltage classes supported on the UIM interface.The list must start at the lowest voltage and progress top the highest voltagein order. */
typedef enum {UIM_VOLTAGE_CLASS_INVALID,UIM_VOLTAGE_CLASS_C,  /* Use 1.8 volts */UIM_VOLTAGE_CLASS_B,  /* Use 3 volts */
} uim_voltage_class_type;

SET_UIM_BAUD_RATE_SLOT函数用来设置UART通信的波特率，该函数在modem_proc\uim\uimdrv\src\hw\clkregime\uimdrv_clk.c中定义。

void SET_UIM_BAUD_RATE_SLOT
(uim_instance_enum_type  uim_instance,uim_clock_rate_conversion_factor_type  nFI,uim_baud_rate_adjustment_factor_type   nDI
)
{uim_instance_global_type *uim_ptr = uim_get_instance_ptr(uim_instance);if(uim_ptr == NULL){UIM_MSG_ERR_0("SET_UIM_BAUD_RATE_SLOT: uim_ptr is NULL");return;}/* Store the current FI and DI */// 设置FI参数uim_ptr->state.FI_current = nFI;// 设置DI参数uim_ptr->state.DI_current = nDI;setBaudRate(uim_ptr->id, nFI, nDI);return;
} /* SET_UIM_BAUD_RATE_SLOT */

UART波特率的计算方法：CLK / (FI / DI)，CLK一般输出为3.84MHZ或者4.8MHZ，本例中SET_UIM_BAUD_RATE_SLOT传入的参数分别是UIM_CRCF_372_1和UIM_BRAF_1。

/* Set the UART clock to the default values. */
SET_UIM_BAUD_RATE_SLOT ( uim_ptr->id, UIM_CRCF_372_1, UIM_BRAF_1);

UART的波特率等于3840000 / (372 / 1) = 10323。这个是大部分UIM卡的速率，叫做一倍速卡，还有一种4倍速的卡，波特率等于3840000 / (372 / 4) = 41290，高通平台目前支持一倍速的卡。uim_dev_init中设置的波特率在后面给UIM卡复位的时候会再次被更改，后面会提到。

UIM上电流程如下。

进入uim_reset_uim函数分析

void uim_reset_uim
(rex_sigs_type            *mask,boolean                   me_powerup,uim_instance_global_type *uim_ptr
)
{. . . . . ./* Indicate that we did not receive the ATR */uim_ptr->atr.atr_received = FALSE;/* reset the voltage_class_known_from_atr varialbe */uim_ptr->flag.voltage_class_known_from_atr = FALSE;if (me_powerup){. . . . . ./* command to power up the UIM due to task start up */if (uim_ptr->command.static_cmd_buf.hdr.command == UIM_HOTSWAP_CARD_INS_F){UIMDRV_MSG_LOW_1(uim_ptr->id,"HOTSWAP: uim_reset_uim due to card inserted command for slot 0x%x",uim_ptr->command.static_cmd_buf.hdr.slot);}uim_ptr->command.static_cmd_buf.hdr.command = UIM_INTERNAL_ME_PUP_F;}else{. . . . . .}uim_process_command(mask, uim_ptr);
} /* uim_reset_uim() */

uim_ptr->command.static_cmd_buf.hdr.command = UIM_INTERNAL_ME_PUP_F;设置状态机的初始状态。UIM_INTERNAL_ME_PUP_F是一个宏，值为0x0100，在modem_proc\uim\api\uim_v.h中定义：

/* Command types */
typedef enum {UIM_NO_SUCH_COMMAND_F = 0,     /* No such command */UIM_INTERNAL_ME_PUP_F = 0x0100,/* POWER UP UIM due to task start up */UIM_INTERNAL_WAKE_UP_F,        /* Power up due to Power management */. . . . . .UIM_MAX_F
} uim_cmd_name_type;

接下来调用uim_process_command函数：

void uim_process_command
(/* Pointer to received command */rex_sigs_type            *mask,/* rex signals type mask */uim_instance_global_type *uim_ptr
)
{. . . . . ./* If the current directory is current to process the command, thenprocess the command */if(FALSE == intermediate_select.is_needed){. . . . . ./* Get the mode of the command */uim_ptr->state.cmd_mode =(uim_command_mode_type) UIM_GET_CMD_MODE((int)uim_ptr->command.cmd_ptr->hdr.command);switch (uim_ptr->state.cmd_mode){. . . . . .case UIM_GENERIC_CMD:default:command_transacted = uim_process_generic_command (uim_ptr);break;}  /* end for switch */}else{. . . . . .}. . . . . .
} /* uim_process_command */

UIM_GET_CMD_MODE是一个宏，在modem_proc\uim\uimdrv\src\uim.c中定义：
#define UIM_GET_CMD_MODE(command) ((command >> 8) & 0x0F)
uim_ptr->command.cmd_ptr->hdr.command在前面被赋值为0x0100，这样uim_ptr->state.cmd_mode的值就是0x01，在switch中会走UIM_GENERIC_CMD分支。UIM_GENERIC_CMD是一个宏，在modem_proc\uim\uimdrv\src\uimi.h中定义：

typedef enum {UIM_NO_SUCH_CMD = 0x0,UIM_GENERIC_CMD = 0x1,UIM_GSM_CMD     = 0x2,UIM_CDMA_CMD    = 0x3,UIM_USIM_CMD    = 0x4,UIM_ISIM_CMD    = 0x5
} uim_command_mode_type;

接下来进入uim_process_generic_command函数：

boolean uim_process_generic_command
(uim_instance_global_type *uim_ptr
)
{. . . . . ./* Process the generic command. */switch (uim_ptr->command.cmd_ptr->hdr.command){case UIM_INTERNAL_ME_PUP_F:         /* POWER UP UIM due to task start up */uim_ptr->command.generic_state_ptr = UIM_INTERNAL_PUP_STATES;break;. . . . . .}if (status){/* Call the state machine. */uim_generic_command (uim_ptr);}else{. . . . . .}return(status);
} /* uim_process_generic_command() */

uim_ptr->command.cmd_ptr->hdr.command在前面被赋值为UIM_INTERNAL_ME_PUP_F，所以在switch中会走UIM_INTERNAL_ME_PUP_F分支。在这个case分支中，执行了让uim_ptr->command.generic_state_ptr 指针指向了UIM_INTERNAL_PUP_STATES数组，该数组在modem_proc\uim\uimdrv\src\uimgen.c中定义：

/* State configuration for the commands. */
/*  UIM_INTERNAL_ME_PUP_F    = 0x0100, POWER UP UIM due to task start up */
static const uim_generic_state_type UIM_INTERNAL_PUP_STATES[] =
{ UIM_POWER_UP_ST, UIM_RESET_ST,UIM_DELAY_AFTER_ATR_ST, UIM_PPS_ST, UIM_UPDATE_OP_PARAMS_ST,
#if defined( FEATURE_UIM_T_1_SUPPORT )UIM_IFS_NEG_ST,
#endif /* FEATURE_UIM_T_1_SUPPORT */UIM_SEND_STATUS_ST,UIM_CHECK_CHARACTERISTICS_ST,UIM_TERMINAL_CAPABILITY_ST,UIM_SELECT_ICCID_ST, UIM_READ_ICCID_ST,UIM_CHECK_FOR_CDMA_DF,UIM_DONE_ST };

后面会通过对generic_state_ptr指针的操作来进行状态机的切换。接下来调用uim_generic_command函数。

void uim_generic_command
(uim_instance_global_type *uim_ptr
)
{. . . . . ./* Build an APDU based on the UIM generic state */switch(*uim_ptr->command.generic_state_ptr){. . . . . .case UIM_POWER_UP_ST:                     /* Power Up state */{. . . . . .uim_power_up(uim_ptr);. . . . . .if(uim_nv_is_feature_enabled(UIMDRV_FEATURE_INTERFACE_NOT_USED,uim_ptr) == FALSE){uim_timed_sleep(UIM_CARD_DELAY_TIMEOUT, uim_ptr, UIM_ALL_ZERO_SIG);(void)rex_set_sigs(uim_ptr->tcb_ptr, UIM_CMD_RSP_SIG);}} /* end case - UIM_POWER_UP_ST */break;case UIM_RESET_ST:                        /* Reset State */{/* Indicate that we have not yet received an ATR */uim_ptr->atr.atr_received = FALSE;. . . . . ./* Set the flag to FALSE */uim_ptr->atr.atr_pps_done= FALSE;uim_ptr->flag.invalid_pps_received = FALSE;. . . . . ./* Reset the UIM card */uim_reset( &uim_ptr->command.rsp_buf, uim_ptr);. . . . . .} /* end case - UIM_RESET_ST */break;case UIM_DELAY_AFTER_ATR_ST:              /* Introduce delay after ATR */{uim_timed_sleep(UIM_DELAY_TIME_AFTER_ATR, uim_ptr, UIM_ALL_ZERO_SIG);(void)rex_set_sigs(uim_ptr->tcb_ptr,UIM_CMD_RSP_SIG);}break;case UIM_PPS_ST:                          /* PPS State */{. . . . . .uim_send_pps(&uim_ptr->atr.pps_req_buf, uim_ptr);} /* end case - UIM_PPS_ST */break;case UIM_UPDATE_OP_PARAMS_ST:  /* Update Operational Parameters State */{/* Fill out the operational parameters as default values */uim_ptr->state.op_params_buf.change_baud_rate = TRUE;uim_ptr->state.op_params_buf.change_clk_freq = TRUE;uim_ptr->state.op_params_buf.change_guardtime = TRUE;uim_ptr->state.op_params_buf.FI = UIM_CRCF_372_1;uim_ptr->state.op_params_buf.DI = UIM_BRAF_1;if (uim_hw_if.clkreg[uim_ptr->id].m_simClkFreq ==uim_clock_frequency[UIMDRV_CLK_FREQ_3_84_MHZ]){uim_ptr->state.op_params_buf.clock_frequency =UIMDRV_CLK_FREQ_3_84_MHZ;}else if(uim_hw_if.clkreg[uim_ptr->id].m_simClkFreq ==uim_clock_frequency[UIMDRV_CLK_FREQ_4_8_MHZ]){uim_ptr->state.op_params_buf.clock_frequency =UIMDRV_CLK_FREQ_4_8_MHZ;}/* Determine if there is an interface byte to process.  This codeoperates on the ATR as well as the PPS response. */if (uim_ptr->command.rsp_buf.rsp.data[UIM_ATR_T0_BYTE] & (UIM_ATR_TA_PRESENT)){/* Set the op parameters from the ATR/PPS response */uim_ptr->state.op_params_buf.FI = (uim_clock_rate_conversion_factor_type)(uim_ptr->command.rsp_buf.rsp.data[UIM_TA1_INDEX] >> UIM_FI_SHIFT_OF_TA1);uim_ptr->state.op_params_buf.DI = (uim_baud_rate_adjustment_factor_type)(uim_ptr->command.rsp_buf.rsp.data[UIM_TA1_INDEX] & UIM_DI_MASK_OF_TA1);} /* end if - TA(1) does exist in the ATR/PPS. */. . . . . ./* Send the operational parameters */uim_update_op_params( &uim_ptr->state.op_params_buf, uim_ptr);. . . . . ./* Signal is set internally for proper operation of state machine */uim_timed_sleep(UIM_CARD_DELAY_TIMEOUT, uim_ptr, UIM_ALL_ZERO_SIG);(void)rex_set_sigs(uim_ptr->tcb_ptr, UIM_CMD_RSP_SIG);} /* end case - UIM_UPDATE_OP_PARAMS_ST */break;. . . . . .} /* end of main switch */
} /* uim_generic_command */

uim_ptr->command.generic_state_ptr在前面指向了UIM_INTERNAL_PUP_STATES数组，该数组的第一个元素是UIM_POWER_UP_ST，所以在switch中，会走UIM_POWER_UP_ST分支。在这个case中，最后会调用uim_power_up函数。

void uim_power_up
(uim_instance_global_type *uim_ptr
)
{. . . . . ./* Program the currently selected voltage */switch (uim_ptr->state.current_voltage_class){case UIM_VOLTAGE_CLASS_C:{UIMDRV_MSG_HIGH_0(uim_ptr->id, "uim power up @ 1.8 v");uim_program_voltage_class( uim_ptr, UIM_VOLTAGE_CLASS_C );} /* end case - UIM_VOLTAGE_1_8_V */break;case UIM_VOLTAGE_CLASS_B:{UIMDRV_MSG_HIGH_0(uim_ptr->id, "uim power up @ 3 v");uim_program_voltage_class( uim_ptr, UIM_VOLTAGE_CLASS_B );} /* end case - UIM_VOLTAGE_3V */break;default:{UIMDRV_MSG_HIGH_0(uim_ptr->id, "uim power up @ unknown voltage");return;}}/* Turn on the clock for the R-UIM interface */UIM_TCXO_MUST_BE_ON_SLOT(uim_ptr);/* Print the configuration before changing the state */uim_print_uim_config(uim_ptr);/* First, turn on the UIM LDO. */uim_power_on_ldo_slot(uim_ptr);/* Next, place the I/O line in reception mode. */UIM_STOP_BREAK_SLOT(uim_ptr);UIM_CONFIGURE_DATA_FOR_UIM_CONTROLLER(uim_ptr);uim_clk_busy_wait(500);uim_uartdm_uim_controller_recover(uim_ptr);uim_clk_busy_wait(200);UIM_CONFIGURE_CLK_FOR_UIM_CONTROLLER(uim_ptr);uim_clk_busy_wait(200);/* Setup the UIM clock based on clock frequency set by HW enumeration */if (uim_hw_if.clkreg[uim_ptr->id].m_simClkFreq ==uim_clock_frequency[UIMDRV_CLK_FREQ_3_84_MHZ]){uim_clock_control (uim_ptr->id, UIMDRV_CLK_FREQ_3_84_MHZ);}else if(uim_hw_if.clkreg[uim_ptr->id].m_simClkFreq ==uim_clock_frequency[UIMDRV_CLK_FREQ_4_8_MHZ]){uim_clock_control (uim_ptr->id, UIMDRV_CLK_FREQ_4_8_MHZ);}/* Reset the receiver so that the receiver does not process the stop breakas a received byte */UIM_RESET_RX_SLOT (uim_ptr);
} /* uim_power_up */

该函数中，首先根据uim_ptr->state.current_voltage_class的值来进行UIM电源的配置，该值在前面被赋值为UIM_VOLTAGE_CLASS_C，即1.8V。接下来将DATA线设置为接收模式，最后打开UIM的电源，配置CLK线输出3.84MHZ的时钟。注意，uim_power_up中并没有拉高RST线。
uim_generic_command调用完uim_power_up后，通过rex_set_sigs发送UIM_CMD_RSP_SIG信号。返回到uim_task_common函数，在调用完uim_start_initial_powerup后，uim_task_common会进入for循环。

void uim_task_common
(dword uim_global_ptr
)
{. . . . . .uim_dev_init(uim_ptr);. . . . . ./* Power up/reset the card */uim_start_initial_powerup(uim_ptr, &i_mask);. . . . . .for (;;){/* Never exit this loop... *//* Perform the rex wait or check the q and set the signal mask */rex_signals_mask = get_rex_sigs_mask(uim_ptr, i_mask);#ifdef FEATURE_UIM_TEST_FRAMEWORK#error code not present
#endif /* FEATURE_UIM_TEST_FRAMEWORK *//* Handle the signals that are set */b_goto_top = uim_signal_handler(&rex_signals_mask, &i_mask, uim_ptr);. . . . . .} /* end for (;;) */
} /* end uim_task */

该循环会阻塞等待信号，一旦有信号发送，相应的函数就会被调用，信号和函数的对应关系在modem_proc\uim\uimdrv\src\uim_sigs.c中。

/*  This table associates each UIM signal to its appropriate handler function */
static uim_sig_map_type uim_sig_map[] =
{{UIM_DOG_HB_RPT_SIG, uim_handle_dog_sig},{UIM_TASK_STOP_SIG, uim_handle_task_stop_sig},{UIM_SUSPICIOUS_CARD_REM_SIG,uim_handle_card_removed_suspicious_sig},{UIM_POLL_TIMER_SIG, uim_handle_poll_timer_sig},{UIM_HOTSWAP_CMD_CARD_REM_SIG, uim_handle_card_removed_sig},{UIM_HOTSWAP_CMD_CARD_INS_SIG, uim_handle_card_inserted_sig},
#ifdef FEATURE_UIM_USB_UICC{UIM_USB_FALLBACK_TO_ISO_SIG, uim_handle_usb_fallback_to_iso_sig},{UIM_USB_REMOTE_WAKEUP_SIG, uim_handle_usb_remote_wakeup_sig},
#endif /* FEATURE_UIM_USB_UICC */{UIM_STATE_TOGGLE_SIG, uim_handle_state_toggle_sig},{UIM_FETCH_PENDING_SIG, uim_handle_fetch_pending_sig},{UIM_CMD_Q_SIG, uim_handle_cmd_q_sig},{UIM_CMD_RSP_SIG, uim_handle_cmd_rsp_sig},{UIM_EFSLOG_PURGE_SIG, uim_handle_efslog_purge_sig},{UIM_CMD_RSP_TIMEOUT_SIG, uim_handle_cmd_rsp_timeout_sig},{UIM_TRANSACTION_SIG, uim_handle_cmd_rsp_timeout_sig},{UIM_SIMULATE_NULL_TIMER_EXP_SIG, uim_handle_simulate_null_timer_exp_sig},{UIM_BUSY_IND_TIMER_EXP_SIG, uim_handle_busy_ind_timer_exp_sig},{UIM_TRANS_TIMER_EXP_SIG, uim_handle_trans_timer_exp_sig},{UIM_MCGF_NV_REFRESH_SIG, uim_handle_mcgf_nv_refresh_sig},{UIM_EXT_RECOVERY_TIMER_EXP_SIG, uim_handle_extended_recovery_timer_exp_sig},
};

前面说过，uim_generic_command调用完uim_power_up后，通过rex_set_sigs发送UIM_CMD_RSP_SIG信号。在uim_sig_map数组中，UIM_CMD_RSP_SIG信号对应得处理函数是uim_handle_cmd_rsp_sig，该函数调用的流程如下。

进入uim_generic_command_response函数分析。

uim_cmd_status_type uim_generic_command_response
(uim_rsp_buf_type      *rsp_ptr,uim_instance_global_type *uim_ptr
)
{. . . . . ./* Necessary so that we do not change the uim state and switch into thatcase also */curr_uim_generic_state = *uim_ptr->command.generic_state_ptr;UIMDRV_MSG_HIGH_1(uim_ptr->id,"Processsing uim_generic_command_response for state 0x%x",curr_uim_generic_state);switch (curr_uim_generic_state){. . . . . .case UIM_POWER_UP_ST:                     /* Power Up state */{/* Get the next state. */++uim_ptr->command.generic_state_ptr;} /* end case - UIM_POWER_UP_ST */break;. . . . . .} /* end switch - curr_uim_generic_state *//* Continue processing the command only if the response indicates success. */if (status == UIM_CMD_SUCCESS){/* Process the next state of this command. */uim_generic_command(uim_ptr);} /* end if - command is still in progress */. . . . .return(status);
} /* uim_generic_command_response */

在switch中，会走UIM_POWER_UP_ST分支。在这个case中，只是让uim_ptr->command.generic_state_ptr指针指向UIM_INTERNAL_PUP_STATES数组的下一项。所以uim_ptr->command.generic_state_ptr指针指向的值等于UIM_RESET_ST。然后调用uim_generic_command函数，该函数在前面介绍过。uim_generic_command执行到switch时，会走UIM_RESET_ST分支，于是uim_reset被调用。

void uim_reset
(uim_rsp_buf_type         *rsp_ptr,    /* Defines where to put the ATR */uim_instance_global_type *uim_ptr
)
{. . . . . ./* Assert the reset line */UIM_ASSERT_RESET_SLOT (uim_ptr);/* Enable the UART transmitter */UIM_ENABLE_UART_TX_SLOT (uim_ptr);/* Enable the UART receiver */UIM_ENABLE_UART_RX_SLOT (uim_ptr);. . . . . ./* Set the UART clock to the default values. */SET_UIM_BAUD_RATE_SLOT ( uim_ptr->id, UIM_CRCF_372_1, UIM_BRAF_1);. . . . . ./* De-assert the reset line */UIM_DEASSERT_RESET_SLOT (uim_ptr);. . . . . if(uim_nv_is_feature_enabled(UIMDRV_FEATURE_HANDLE_NO_ATR_IN_40000_CLK_CYCLES,uim_ptr) == TRUE){. . . . . .}else{if((uim_ptr->state.DI_current < UIM_BRAF_SIZE) &&(uim_ptr->state.FI_current < UIM_CRCF_SIZE)){uim_uartdm_set_wwt_val(uim_ptr, uim_ptr->card_cmd.work_waiting_time_etus);uim_start_cmd_rsp_timer( uim_ptr->card_cmd.work_waiting_time +UIM_UART_DM_WAITING_TIME_CORRECTION,uim_ptr);}else{. . . . . .}}
} /* uim_reset */

重点来了，uim_reset会调用SET_UIM_BAUD_RATE_SLOT ( uim_ptr->id, UIM_CRCF_372_1, UIM_BRAF_1);重新设置波特率为一倍速，所以不管前面的uim_dev_init函数设置波特率为多少，uim_reset会重置波特率。随后通过UIM_DEASSERT_RESET_SLOT (uim_ptr);来拉高RST线，UIM卡在检测到RST线被高后，会发送ATR给到DATA线。uim_reset的最后会开启定时器，如果定时器超时，那么会发送UIM_CMD_RSP_TIMEOUT_SIG信号，uim_handle_cmd_rsp_timeout_sig函数就会被调用。如果UIM卡在定时时间内发送了ATR，那么uimIntctrlIsr函数就会被调用。

uim_read_rx_fifo会读取DATA线上的数据，保存早uim_ptr->card_cmd.uart_rx_buf中。

void uim_read_rx_fifo
(uim_instance_global_type *uim_ptr,dword  isr,dword *no_of_bytes_received_ptr)
{int length;dword uart_status;int i=0;if(isr == MSMU_ISR_RXSTALE){*no_of_bytes_received_ptr = UIM_GET_NUM_BYTES_IN_RX_SLOT(uim_ptr) - uim_ptr->card_cmd.total_bytes_read;}if (isr == MSMU_ISR_RXLEV){*no_of_bytes_received_ptr = (4 * MSMU_DEF_RFWR_VAL);}if (*no_of_bytes_received_ptr % 4){length = (*no_of_bytes_received_ptr/4) + 1;}else{length = *no_of_bytes_received_ptr/4;}for(uart_status = UIM_READ_STATUS_SLOT(uim_ptr); ((uart_status & MSMU_SR_RXRDY) && (length > 0)) ; length--){uim_ptr->card_cmd.uart_rx_buf[i++] = UIM_GET_RX_WORD_SLOT(uim_ptr);}uim_ptr->card_cmd.total_bytes_read += *no_of_bytes_received_ptr; return;
} /* end uim_read_rx_fifo */

uim_rx_isr_receive_atr会解析ATR中TS，T0等参数，最后会调用uim_command_response_callback来清除定时器，这样定时器就不会发送超时信号。

void uim_command_response_callback
(uim_instance_global_type *uim_ptr
)
{/*if it is a bad status word and Feature is enabled trigger recovery*/if(TRUE == uim_nv_is_feature_enabled(UIMDRV_FEATURE_RECOVERY_ON_BAD_STATUS_WORD, uim_ptr) &&TRUE == uim_ptr->flag.bad_status_words_error){UIMDRV_MSG_ERR_0(uim_ptr->id,"recieved bad status word. forcing recovery");uim_force_recovery(uim_ptr);return;}/* set the command response signal */UIMDRV_MSG_LOW_0(uim_ptr->id,"Recd Command Response Signal");uim_clear_cmd_rsp_timer(uim_ptr);/* clear the signal as well just in case if it was set */(void) rex_clr_sigs( uim_ptr->tcb_ptr, UIM_TRANSACTION_SIG );(void) rex_set_sigs( uim_ptr->tcb_ptr, UIM_CMD_RSP_SIG );
} /*  uim_command_response_callback */

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