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ibmpc: Fix buffer full check

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recv_data should appear to as 'sstt' when it is full with two data.
Both upper and lower byte should be checked.
This commit is contained in:
tmk 2020-05-12 18:28:07 +09:00
parent 4028b200be
commit 77c5017cb2
1 changed files with 3 additions and 1 deletions
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4
tmk_core/protocol/ibmpc.c
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@ -229,6 +229,8 @@ void ibmpc_host_isr_clear(void)
recv_data = 0xFFFF;
}
#define LO8(w) (*((uint8_t *)&(w)))
#define HI8(w) (*(((uint8_t *)&(w))+1))
// NOTE: With this ISR data line can be read within 2us after clock falling edge.
// To read data line early as possible:
// write naked ISR with asembly code to read the line and call C func to do other job?
@ -379,7 +381,7 @@ DONE:
ibmpc_error = IBMPC_ERR_FF;
goto ERROR;
}
if ((recv_data & 0xFF00) != 0xFF00) {
if (HI8(recv_data) != 0xFF && LO8(recv_data) != 0xFF) {
// buffer full
ibmpc_error = IBMPC_ERR_FULL;
goto ERROR;