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comparison src/cs/drivers/drv_app/uart/uartfax.c @ 682:17b7b92e7dba

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uartfax.c: fix for old Openmoko bug with Auto-CTS Openmoko made the change of enabling hardware assisted CTS flow control in the UART when RTS/CTS flow control is used - it is a change which we have retained in FreeCalypso - but they forgot to turn this hw mode off if RTS/CTS flow control is deselected at the application level. We (FreeCalypso) are now fixing the latter defect ourselves.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Jun 2020 02:53:02 +0000
parents 140a0d24a64c
children 81394dcdf4d3
comparison
equal deleted inserted replaced
681:140a0d24a64c 682:17b7b92e7dba
3621 /* 3621 /*
3622 WRITE_UART_REGISTER ( 3622 WRITE_UART_REGISTER (
3623 uart, IER, READ_UART_REGISTER (uart, IER) | IER_SLEEP); 3623 uart, IER, READ_UART_REGISTER (uart, IER) | IER_SLEEP);
3624 */ 3624 */
3625 #endif 3625 #endif
3626 3626
3627 /*
3628 * Openmoko made the change of enabling hardware assisted CTS
3629 * flow control in the UART when RTS/CTS flow control is used -
3630 * it is a change which we have retained in FreeCalypso -
3631 * but they forgot to turn this hw mode off if RTS/CTS flow control
3632 * is deselected at the application level. We (FreeCalypso)
3633 * are now fixing the latter defect ourselves.
3634 */
3627 if (fcMode == fc_rts) { 3635 if (fcMode == fc_rts) {
3628 #if 1 // Dmitriy: enable hardware assisted CTS 3636 /* begin Openmoko change */
3629 volatile SYS_UWORD8 oldValue; 3637 SYS_UWORD8 oldValue;
3630 3638
3631 oldValue = READ_UART_REGISTER (uart, LCR); 3639 oldValue = READ_UART_REGISTER (uart, LCR);
3632 3640
3633 // LCR value to allow acces to EFR 3641 // LCR value to allow acces to EFR
3634 3642
3635 WRITE_UART_REGISTER (uart, LCR, 0xBF); 3643 WRITE_UART_REGISTER (uart, LCR, 0xBF);
3636 3644
3637 // enable hardware assisted CTS 3645 // enable hardware assisted CTS
3638 3646
3639 SET_BIT (uart, EFR, AUTO_CTS_BIT); 3647 SET_BIT (uart, EFR, AUTO_CTS_BIT);
3640 3648
3641 WRITE_UART_REGISTER (uart, LCR, oldValue); 3649 WRITE_UART_REGISTER (uart, LCR, oldValue);
3642 #endif 3650 /* end Openmoko change */
3651
3643 if (uart->rts_level) 3652 if (uart->rts_level)
3644 uart->tx_stopped_by_driver = 1; 3653 uart->tx_stopped_by_driver = 1;
3654 } else {
3655 /* FreeCalypso addition: turn off OM-added Auto-CTS */
3656 SYS_UWORD8 oldValue;
3657
3658 oldValue = READ_UART_REGISTER (uart, LCR);
3659
3660 // LCR value to allow acces to EFR
3661
3662 WRITE_UART_REGISTER (uart, LCR, 0xBF);
3663
3664 // disable hardware assisted CTS
3665
3666 RESET_BIT (uart, EFR, AUTO_CTS_BIT);
3667
3668 WRITE_UART_REGISTER (uart, LCR, oldValue);
3645 } 3669 }
3646 3670
3647 /* 3671 /*
3648 * If the high watermark is reached, RTS is activated or XOFF is sent 3672 * If the high watermark is reached, RTS is activated or XOFF is sent
3649 * according to the flow control mode. Else, RTS is deactivated or XON 3673 * according to the flow control mode. Else, RTS is deactivated or XON