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installer: SERIAL: Use Timer1 instead of Timer2

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Same as in the main code.

Use Timer1 as baudrate generator.
Timer1 can be programmed to have the same accuracy and deviation as
Timer2, up to 115200 at F_SYS = 125 Mhz. See comment
setup_serial_timer1() comment for valid baudrates and settings.
Timer1 is used in 8-bit auto-reload mode.

Only differance is that the serial is transmit only and poll-based so no
interrupts are used to transmit data.
This commit is contained in:
René van Dorst
2026-01-09 07:52:35 +01:00
parent 5b4b0efb16
commit c5c6b97ad1
2 changed files with 45 additions and 18 deletions
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rtlplayground.c
+3 -1
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@@ -121,7 +121,7 @@ __xdata char sfp_module_vendor[2][17];
__xdata char sfp_module_model[2][17];
__xdata char sfp_module_serial[2][17];
__xdata uint8_t sfp_options[2];
__sbit tx_buf_empty = 1;
__sbit tx_buf_empty;
#define ETHERTYPE_OFFSET (12 + VLAN_TAG_SIZE + RTL_TAG_SIZE)
@@ -1713,6 +1713,8 @@ void setup_serial_timer1(void)
TI = 0; // Clear TI-interrupt flag
RI = 0; // Clear RI-interrupt flag
tx_buf_empty = 1; // Set tx `serial buffer is empty`-software flag.
ES = 1; // Enable serial IRQ
}