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Add UART receive functions

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This commit is contained in:
Takashi Toyoshima 2014-12-11 00:27:35 +09:00
parent 02c08505eb
commit 7568e2aeac
1 changed files with 26 additions and 6 deletions
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32
uart.S
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@ -20,7 +20,7 @@ uart_init:
str r1, [r0]
// 1) IO port configuration to use UART
ldr r0, =#IOCON_PIO1_6
movs r1, #(PIO_BASE | FUNC_RXD)
movs r1, #(PIO_BASE | FUNC_RXD | MODE_UP)
str r1, [r0]
ldr r0, =#IOCON_PIO1_7
movs r1, #(PIO_BASE | FUNC_TXD)
@ -56,11 +56,6 @@ uart_init:
movs r1, #(WORD_LEN_8 | STOP_BIT_1)
str r1, [r0]
// Enable TX
ldr r0, =#U0TER
movs r1, #TXEN
str r1, [r0]
// Reset FIFO
ldr r0, =#U0FCR
movs r1, #(FIFO_ENABLE | RX_RESET | TX_RESET)
@ -69,6 +64,31 @@ uart_init:
mov pc, lr
.size uart_init, .-uart_init
// int uart_ready();
.global uart_ready
.type uart_ready, %function
uart_ready:
ldr r0, =#U0LSR
ldr r0, [r0]
movs r1, #LSR_RDR
ands r0, r0, r1
bne 1f
movs r0, #0
mov pc, lr
1:
movs r0, #1
mov pc, lr
.size uart_ready, .-uart_ready
// int uart_getc();
.global uart_getc
.type uart_getc, %function
uart_getc:
ldr r0, =#U0RBR
ldr r0, [r0]
mov pc, lr
.size uart_getc, .-uart_getc
// void uart_putc(char c);
.global uart_putc
.type uart_putc, %function