diff options
| -rw-r--r-- | include/symbols.h | 6 | ||||
| -rw-r--r-- | kernel/drivers/uart.c | 2 |
2 files changed, 8 insertions, 0 deletions
diff --git a/include/symbols.h b/include/symbols.h index 62f4a96..49db734 100644 --- a/include/symbols.h +++ b/include/symbols.h @@ -13,6 +13,12 @@ enum // The offsets for reach register. GPIO_BASE = (MMIO_BASE + 0x200000), + UART_FIFO_18 = 0, + UART_FIFO_14 = 1, + UART_FIFO_12 = 2, + UART_FIFO_34 = 3, + UART_FIFO_78 = 4, + //// The base address for UART. UART0_BASE = (GPIO_BASE + 0x1000), // for raspi4 0xFE201000, raspi2 & 3 0x3F201000, and 0x20201000 for raspi1 diff --git a/kernel/drivers/uart.c b/kernel/drivers/uart.c index 33f9e82..bd12486 100644 --- a/kernel/drivers/uart.c +++ b/kernel/drivers/uart.c @@ -37,6 +37,8 @@ void uart_init(void) store32((1<<4)|(1<<5)|(1<<6), UART0_LCRH); // Mask all interrupts store32((1<<1)|(1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9)|(1<<10), UART0_IMSC); + // Interrupt when FIFO is 1/8 full + store32((UART_FIFO_18 << 3) | (UART_FIFO_12 << 0), UART0_IFLS); // Enable UART0 store32((1<<0)|(1<<8)|(1<<9), UART0_CR); } |