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lpc176x: Move pin definitions together in serial.c 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-05-25 12:31:42 -04:00
parent 6a3c357a50
commit ce8fe615ed
1 changed files with 28 additions and 22 deletions
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50
src/lpc176x/serial.c
View File

@ -12,33 +12,41 @@
#include "internal.h" // gpio_peripheral
#include "sched.h" // DECL_INIT
DECL_CONSTANT_STR("RESERVE_PINS_serial", "P0.3,P0.2");
#define GPIO_Rx GPIO(0, 3)
#define GPIO_Tx GPIO(0, 2)
#define GPIO_FUNCTION_UARTx 1
#define LPC_UARTx LPC_UART0
#define UARTx_IRQn UART0_IRQn
#define PCLK_UARTx PCLK_UART0
// Write tx bytes to the serial port
static void
kick_tx(void)
{
for (;;) {
if (!(LPC_UART0->LSR & (1<<5))) {
if (!(LPC_UARTx->LSR & (1<<5))) {
// Output fifo full - enable tx irq
LPC_UART0->IER = 0x03;
LPC_UARTx->IER = 0x03;
break;
}
uint8_t data;
int ret = serial_get_tx_byte(&data);
if (ret) {
// No more data to send - disable tx irq
LPC_UART0->IER = 0x01;
LPC_UARTx->IER = 0x01;
break;
}
LPC_UART0->THR = data;
LPC_UARTx->THR = data;
}
}
void
UART0_IRQHandler(void)
UARTx_IRQHandler(void)
{
uint32_t iir = LPC_UART0->IIR, status = iir & 0x0f;
uint32_t iir = LPC_UARTx->IIR, status = iir & 0x0f;
if (status == 0x04)
serial_rx_byte(LPC_UART0->RBR);
serial_rx_byte(LPC_UARTx->RBR);
else if (status == 0x02)
kick_tx();
}
@ -46,37 +54,35 @@ UART0_IRQHandler(void)
void
serial_enable_tx_irq(void)
{
if (LPC_UART0->LSR & (1<<5)) {
if (LPC_UARTx->LSR & (1<<5)) {
irqstatus_t flag = irq_save();
kick_tx();
irq_restore(flag);
}
}
DECL_CONSTANT_STR("RESERVE_PINS_serial", "P0.3,P0.2");
void
serial_init(void)
{
// Setup baud
LPC_UART0->LCR = (1<<7); // set DLAB bit
enable_pclock(PCLK_UART0);
uint32_t pclk = get_pclock_frequency(PCLK_UART0);
LPC_UARTx->LCR = (1<<7); // set DLAB bit
enable_pclock(PCLK_UARTx);
uint32_t pclk = get_pclock_frequency(PCLK_UARTx);
uint32_t div = pclk / (CONFIG_SERIAL_BAUD * 16);
LPC_UART0->DLL = div & 0xff;
LPC_UART0->DLM = (div >> 8) & 0xff;
LPC_UART0->FDR = 0x10;
LPC_UART0->LCR = 3; // 8N1 ; clear DLAB bit
LPC_UARTx->DLL = div & 0xff;
LPC_UARTx->DLM = (div >> 8) & 0xff;
LPC_UARTx->FDR = 0x10;
LPC_UARTx->LCR = 3; // 8N1 ; clear DLAB bit
// Enable fifo
LPC_UART0->FCR = 0x01;
LPC_UARTx->FCR = 0x01;
// Setup pins
gpio_peripheral(GPIO(0, 3), 1, 0);
gpio_peripheral(GPIO(0, 2), 1, 0);
gpio_peripheral(GPIO_Rx, GPIO_FUNCTION_UARTx, 0);
gpio_peripheral(GPIO_Tx, GPIO_FUNCTION_UARTx, 0);
// Enable receive irq
armcm_enable_irq(UART0_IRQHandler, UART0_IRQn, 0);
LPC_UART0->IER = 0x01;
armcm_enable_irq(UARTx_IRQHandler, UARTx_IRQn, 0);
LPC_UARTx->IER = 0x01;
}
DECL_INIT(serial_init);