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chg: i2c timings.

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This commit is contained in:
Chris 2018-07-06 17:10:49 +02:00
commit aef053879c
1 changed files with 24 additions and 22 deletions
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46
common/i2c.c
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@ -28,6 +28,10 @@
volatile unsigned long c;
// 直接使用循环来延时，一个循环 6 条指令，48M， Delay=1 大概为 200kbps
// timer.
// I2CSpinDelayClk(4) = 12.31us
// I2CSpinDelayClk(1) = 3.07us
//void I2CSpinDelayClk(uint16_t delay) ;
void __attribute__((optimize("O0"))) I2CSpinDelayClk(uint16_t delay) {
for (c = delay * 2; c; c--) {};
@ -120,18 +124,20 @@ bool WaitSCL_H_delay(uint32_t delay) {
}
return false;
}
// 5000 * 3.07us = 15350us. 15.35ms
bool WaitSCL_H(void) {
return WaitSCL_H_delay(5000);
}
// Wait max 300ms or until SCL goes LOW.
// Which ever comes first
bool WaitSCL_300ms(void){
bool WaitSCL_L_300ms(void){
volatile uint16_t delay = 300;
while ( delay-- ) {
if (!SCL_read)
return true;
if (!SCL_read) {
if ( MF_DBGLEVEL > 3 ) Dbprintf(" 300ms SCL delay counter %d", delay);
return true;
}
SpinDelay(1);
}
@ -352,7 +358,7 @@ uint8_t I2C_BufferRead(uint8_t *data, uint8_t len, uint8_t device_cmd, uint8_t d
if (!I2C_Start())
return 0;
// 0xB0 or 0xC0 i2c write
// 0xB0 / 0xC0 == i2c write
I2C_SendByte(device_address & 0xFE);
if (!I2C_WaitAck())
break;
@ -361,7 +367,7 @@ uint8_t I2C_BufferRead(uint8_t *data, uint8_t len, uint8_t device_cmd, uint8_t d
if (!I2C_WaitAck())
break;
// 0xB1 or 0xC1 read
// 0xB1 / 0xC1 == i2c read
I2C_Start();
I2C_SendByte(device_address | 1);
@ -409,7 +415,7 @@ uint8_t I2C_ReadFW(uint8_t *data, uint8_t len, uint8_t msb, uint8_t lsb, uint8_t
if (!I2C_Start())
return 0;
// 0xB0 or 0xC0 i2c write
// 0xB0 / 0xC0 i2c write
I2C_SendByte(device_address & 0xFE);
if (!I2C_WaitAck())
break;
@ -424,7 +430,7 @@ uint8_t I2C_ReadFW(uint8_t *data, uint8_t len, uint8_t msb, uint8_t lsb, uint8_t
if (!I2C_WaitAck())
break;
// 0xB1 or 0xC1 read
// 0xB1 / 0xC1 i2c read
I2C_Start();
I2C_SendByte(device_address | 1);
if (!I2C_WaitAck())
@ -465,7 +471,7 @@ bool I2C_WriteFW(uint8_t *data, uint8_t len, uint8_t msb, uint8_t lsb, uint8_t d
if (!I2C_Start())
return false;
// 0xB0
// 0xB0 == i2c write
I2C_SendByte(device_address & 0xFE);
if (!I2C_WaitAck())
break;
@ -519,8 +525,6 @@ bool GetATR(smart_card_atr_t *card_ptr) {
card_ptr->atr_len = 0;
memset(card_ptr->atr, 0, sizeof(card_ptr->atr));
}
if ( MF_DBGLEVEL > 3 ) DbpString("before sending GET_ATR");
// Send ATR
// start [C0 01] stop
@ -530,23 +534,21 @@ bool GetATR(smart_card_atr_t *card_ptr) {
if (!WaitSCL_300ms()) {
if ( MF_DBGLEVEL > 3 ) DbpString(" 300ms SCL delay - timed out");
return false;
}
}
// 8051 speaks with smart card.
// 50ms timeout?
if (!WaitSCL_H_delay(1500*50) ) {
// 1000*50*3.07 = 1530.5ms
if (!WaitSCL_H_delay(1000*50) ) {
if ( MF_DBGLEVEL > 3 ) DbpString("wait for SCL HIGH - timed out");
return false;
}
if ( MF_DBGLEVEL > 3 ) DbpString("before reading");
// start [C0 03 start C1 len aa bb cc stop]
uint8_t len = I2C_BufferRead(card_ptr->atr, sizeof(card_ptr->atr), I2C_DEVICE_CMD_READ, I2C_DEVICE_ADDRESS_MAIN);
// remove length byte from the read bytes.
if ( card_ptr )
card_ptr->atr_len = len - 1;
card_ptr->atr_len = (len == 0) ? 0 : len - 1;
return true;
}
@ -558,9 +560,9 @@ void SmartCardAtr(void) {
I2C_Reset_EnterMainProgram();
bool isOK = GetATR( &card );
if ( isOK )
if ( isOK )
Dbhexdump(card.atr_len, card.atr, false);
cmd_send(CMD_ACK, isOK, sizeof(smart_card_atr_t), 0, &card, sizeof(smart_card_atr_t));
}
@ -617,7 +619,7 @@ void SmartCardUpgrade(uint64_t arg0) {
// write
res = I2C_WriteFW(fwdata+pos, size, msb, lsb, I2C_DEVICE_ADDRESS_BOOT);
if ( !res ) {
Dbprintf("Writing failed");
DbpString("Writing failed");
isOK = false;
break;
}
@ -628,14 +630,14 @@ void SmartCardUpgrade(uint64_t arg0) {
// read
res = I2C_ReadFW(verfiydata, size, msb, lsb, I2C_DEVICE_ADDRESS_BOOT);
if ( res == 0) {
Dbprintf("Reading back failed");
DbpString("Reading back failed");
isOK = false;
break;
}
// cmp
if ( 0 != memcmp(fwdata+pos, verfiydata, size)) {
Dbprintf("not equal data");
DbpString("not equal data");
isOK = false;
break;
}