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3B2: Fix critical UART bug

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This commit is contained in:
Seth Morabito 2017-11-25 11:04:04 -08:00
parent c2c248a1f2
commit 3147c30b80
1 changed files with 6 additions and 5 deletions
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11
3B2/3b2_iu.c
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@ -310,13 +310,14 @@ t_stat iu_svc_tti_a(UNIT *uptr)
temp & 0xff, temp & 0xff);
if (iu_port_a.conf & RX_EN) {
if ((iu_port_a.stat & STS_FFL) == 0 && iu_port_a.w_p == iu_port_a.r_p) {
sim_debug(READ_MSG, &tti_a_dev,
">>> FIFO FULL ON KEYBOARD READ!!!! <<<\n");
iu_port_a.stat |= STS_FFL;
} else {
if ((iu_port_a.stat & STS_FFL) == 0) {
iu_port_a.rxbuf[iu_port_a.w_p] = (temp & 0xff);
iu_port_a.w_p = (iu_port_a.w_p + 1) % IU_BUF_SIZE;
if (iu_port_a.w_p == iu_port_b.w_p) {
sim_debug(READ_MSG, &tti_a_dev,
">>> FIFO FULL ON KEYBOARD READ!!!! <<<\n");
iu_port_a.stat |= STS_FFL;
}
}
iu_port_a.stat |= STS_RXR;
iu_state.istat |= ISTS_RAI;