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change uart baudrate for tm4c123 to 115200

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This commit is contained in:
hathach 2021-12-07 16:28:24 +07:00
parent 03835c8183
commit 8e0400d531
2 changed files with 19 additions and 7 deletions
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25
hw/bsp/tm4c123/family.c
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@ -7,7 +7,13 @@
//--------------------------------------------------------------------+
void USB0_Handler(void)
{
#if TUSB_OPT_HOST_ENABLED
tuh_int_handler(0);
#endif
#if TUSB_OPT_DEVICE_ENABLED
tud_int_handler(0);
#endif
}
//--------------------------------------------------------------------+
@ -23,10 +29,12 @@ static void board_uart_init (void)
GPIOA->PCTL |= (1 << 0) | (1 << 4); // Configure the GPIOPCTL register to select UART0 in PA0 and PA1
GPIOA->DEN |= (1 << 0) | (1 << 1); // Enable the digital functionality in PA0 and PA1
/** BAUDRATE = 9600 bits per second, refer manual for calculation **/
// BAUDRATE = 115200, with SystemCoreClock = 50 Mhz refer manual for calculation
// - BRDI = SystemCoreClock / (16* baud)
// - BRDF = int(fraction*64 + 0.5)
UART0->CTL &= ~(1 << 0); // Disable UART0 by clearing UARTEN bit in the UARTCTL register
UART0->IBRD = 325; // Write the integer portion of the BRD to the UARTIRD register
UART0->FBRD = 33; // Write the fractional portion of the BRD to the UARTFBRD registerer
UART0->IBRD = 27; // Write the integer portion of the BRD to the UARTIRD register
UART0->FBRD = 8; // Write the fractional portion of the BRD to the UARTFBRD registerer
UART0->LCRH = (0x3 << 5); // 8-bit, no parity, 1 stop bit
UART0->CC = 0x0; // Configure the UART clock source as system clock
@ -40,8 +48,7 @@ static void initialize_board_led (GPIOA_Type *port, uint8_t PinMsk, uint8_t dirm
SYSCTL->RCGCGPIO |= (1 << 5);
/* Let the clock stabilize */
while ( !((SYSCTL->PRGPIO) & (1 << 5)) )
;
while ( !((SYSCTL->PRGPIO) & (1 << 5)) ) {}
/* Port Digital Enable */
port->DEN |= PinMsk;
@ -60,9 +67,13 @@ static void board_switch_init (void)
static void WriteGPIOPin (GPIOA_Type *port, uint8_t PinMsk, bool state)
{
if ( state )
{
port->DATA |= PinMsk;
}
else
{
port->DATA &= ~(PinMsk);
}
}
static uint32_t ReadGPIOPin (GPIOA_Type *port, uint8_t pinMsk)
@ -99,8 +110,7 @@ void board_init (void)
SYSCTL->RCGCGPIO |= (1u << 3);
/* Let the clock stabilize */
while ( !(SYSCTL->PRGPIO & (1u << 3)) )
;
while ( !(SYSCTL->PRGPIO & (1u << 3)) ) {}
/* USB IOs to Analog Mode */
GPIOD->AFSEL &= ~((1u << 4) | (1u << 5));
@ -119,6 +129,7 @@ void board_init (void)
/* Initialize board UART */
board_uart_init();
TU_LOG1_INT(SystemCoreClock);
}
void board_led_write (bool state)

1
hw/bsp/tm4c123/family.mk
View File

@ -28,6 +28,7 @@ INC += \
SRC_C += \
src/portable/mentor/musb/dcd_musb.c \
src/portable/mentor/musb/hcd_musb.c \
$(MCU_DIR)/Source/system_TM4C123.c \
$(MCU_DIR)/Source/GCC/tm4c123_startup.c