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For the max 256-byte frame, SIM wasn't ready early enough, corrupting
the reception buffer with 5 spurious bytes.
Empirically, 109 clock cycles is the minimum value that worked.
Adding 1 clock cycle as a safety buffer.
This commit is contained in:
Jean-Michel Picod 2022-12-09 13:17:19 +01:00
parent 4c695c03b6
commit f32de52b46
1 changed files with 2 additions and 2 deletions
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armsrc/i2c.c
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@ -235,9 +235,9 @@ static bool I2C_WaitForSim(void) {
// 8051 speaks with smart card.
// 1000*50*3.07 = 153.5ms
// 1000*90*3.07 = 276.3ms
// 1000*110*3.07 = 337.7ms
// 1byte transfer == 1ms with max frame being 256bytes
return WaitSCL_H_delay(1000 * 90);
return WaitSCL_H_delay(1000 * 110);
}
// send i2c STOP