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Change serial baud to 500k at double-speed; but add cmake option for serial rxmode

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This commit is contained in:
Allen Hill 2023-09-14 19:48:39 -04:00
parent 9fcca0a6fb
commit 1cafed82d0
3 changed files with 20 additions and 6 deletions
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7
CMakeLists.txt
View File

@ -49,6 +49,12 @@ set_property(CACHE TCB_CLKSEL PROPERTY STRINGS
TCB_CLKSEL_CLKTCA_gc
)
set(USART_RXMODE "USART_RXMODE_CLK2X_gc" CACHE STRING "USART at normal or double speed operation")
set_property(CACHE USART_RXMODE PROPERTY STRINGS
USART_RXMODE_CLK2X_gc
USART_RXMODE_NORMAL_gc
)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.3")
message(FATAL_ERROR "Insufficient AVR-GCC version; Support for ATtiny3216 was added in GCC v8")
@ -120,6 +126,7 @@ target_compile_definitions(mockingboard PRIVATE
CLK_PRESCALE_DIV=${CLK_PRESCALE_DIV}
__CLK_PRESCALE_DIV=__${CLK_PRESCALE_DIV}
TCB_CLKSEL=${TCB_CLKSEL}
USART_RXMODE=${USART_RXMODE}
)
target_compile_options(mockingboard PRIVATE
--param=min-pagesize=0

3
CMakePresets.json
View File

@ -23,7 +23,8 @@
"cacheVariables": {
"CMAKE_BUILD_TYPE": "RelWithDebInfo",
"FREQSEL": "20MHz",
"TCB_CLKSEL": "TCB_CLKSEL_CLKDIV1_gc"
"TCB_CLKSEL": "TCB_CLKSEL_CLKDIV1_gc",
"USART_RXMODE": "USART_RXMODE_CLK2X_gc"
}
}
]

16
src/com232.c
View File

@ -20,9 +20,6 @@
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#define USART_BAUD_RATE(BAUD_RATE) \
(uint16_t)((float)(F_CPU * 64 / (16 * (float)BAUD_RATE)) + 0.5)
#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/sfr_defs.h>
@ -31,6 +28,15 @@
#include "com232.h"
#include "timing.h"
#if USART_RXMODE == USART_RXMODE_CLK2X_gc
#define RXMODE_S 9
#elif USART_RXMODE == USART_RXMODE_NORMAL_gc
#define RXMODE_S 16
#endif
#define USART_BAUD_RATE(BAUD_RATE) \
(uint16_t)((float)(F_CPU * 64 / (USART_RXMODE * (float)BAUD_RATE)) + 0.5)
uint8_t RS232_RxCharBuffer[25], RS232_RxCharBegin, RS232_RxCharEnd;
uint8_t readkey;
@ -44,11 +50,11 @@ void RS232_Init(void) {
USART0.CTRLA = USART_RXCIE_bm; // Enable receive interrupts
USART0.CTRLB = USART_RXEN_bm | USART_TXEN_bm | // Enable Rx/Tx and set receive
USART_RXMODE_NORMAL_gc; // mode normal
USART_RXMODE; // mode
USART0.CTRLC = USART_CMODE_ASYNCHRONOUS_gc | USART_PMODE_DISABLED_gc |
USART_CHSIZE_8BIT_gc |
USART_SBMODE_1BIT_gc; // Async UART with 8N1 config
USART0.BAUD = USART_BAUD_RATE(250000);
USART0.BAUD = USART_BAUD_RATE(500000);
}
ISR(USART0_RXC_vect) {