Добрый день, уважаемые эксперты.
Недавно взялся изучать ARM (на плате SAM7EX256). Возникла проблема с прерыванием от UART. Перелопатил примеры и точ то нашел на форуме. Ни в какую не хочет работать.
Для компиляции использую IAR 5.40.
Может еще какие настройки нужны? Нет ли (как в AVR) какой нибудь комады типа SEI?
#include <board.h>
#include <irq/irq.h>
#include <usart/usart.h>
#include <pmc/pmc.h>
#include "lcd.h"
volatile int uart_count_rx_irq;
//volatile int uart_count_rx_sim;
void InitFreq(void)
{
AT91C_BASE_MC->MC_FMR = AT91C_MC_FWS_1FWS ;
AT91C_BASE_WDTC->WDTC_WDMR= AT91C_WDTC_WDDIS;
AT91C_BASE_PMC->PMC_MOR = (( AT91C_CKGR_OSCOUNT & (0x40 <<8) | AT91C_CKGR_MOSCEN ));
while(!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS));
AT91C_BASE_PMC->PMC_PLLR = AT91C_CKGR_USBDIV_1 | (16<<8) | (AT91C_CKGR_MUL & (72<<16)) | (AT91C_CKGR_DIV & 14);
while(!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK));
while(!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2 ;
while(!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK ;
while(!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
}
void InitPeriphery(void)
{
//enable the clock of the PIO
AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOA;
//enable the clock of the PIO
AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOB;
// BUTTON SW1, SW2
AT91C_BASE_PIOB->PIO_ODR |= BIT24 | BIT25; //Configure in Input
AT91C_BASE_PIOB->PIO_PER |= BIT24 | BIT25; //Enable PB24
//Joystick
AT91C_BASE_PIOB->PIO_ODR |= BIT7 | BIT8 | BIT9 | BIT14 | BIT15; //Configure in Input
AT91C_BASE_PIOB->PIO_PER |= BIT7 | BIT8 | BIT9 | BIT14 | BIT15; //Enable PB25
}
char U0ReadChar(void)
{
while(!(AT91C_BASE_US0->US_CSR & AT91C_US_RXRDY));
return (AT91C_BASE_US0->US_RHR & 0x1FF);
}
void U0WriteChar(char sym)
{
while(!(AT91C_BASE_US0->US_CSR & AT91C_US_TXRDY));
AT91C_BASE_US0->US_THR = sym & 0x1FF;
}
void U0_ISR(void)
{
unsigned int status;
status = AT91C_BASE_US0->US_CSR;
if ((status & AT91C_US_RXBUFF) == AT91C_US_RXRDY)
{
uart_count_rx_irq++;
U0WriteChar(U0ReadChar());
}
}
void U0Init(void)
{
unsigned int mode = AT91C_US_USMODE_NORMAL
| AT91C_US_CLKS_CLOCK
| AT91C_US_CHRL_8_BITS
| AT91C_US_PAR_NONE
| AT91C_US_NBSTOP_1_BIT
| AT91C_US_CHMODE_NORMAL;
//For UART0
AT91C_BASE_PIOA->PIO_PDR = BIT0 | BIT1 | BIT27 | BIT28;
AT91C_BASE_PIOA->PIO_ASR = BIT0 | BIT1 | BIT27 | BIT28;
AT91C_BASE_PIOA->PIO_BSR = 0;
// Enable the peripheral clock in the PMC
PMC_EnablePeripheral(AT91C_ID_US0);
//Disable Time Guard
AT91C_BASE_US0->US_TTGR = 0;
// Configure the USART in the desired mode @115200 bauds
USART_Configure(AT91C_BASE_US0, mode, 115200, BOARD_MCK);
// Configure the RXBUFF interrupt
IRQ_ConfigureIT(AT91C_ID_US0, 0, U0_ISR);
//Enable USART int
AT91C_BASE_US0->US_IER = AT91C_US_RXRDY;
//Enable AIC int
IRQ_EnableIT(AT91C_ID_US0);
// Enable receiver & transmitter
USART_SetTransmitterEnabled(AT91C_BASE_US0, 1);
USART_SetReceiverEnabled(AT91C_BASE_US0, 1);
}
void main()
{
InitFreq();
InitPeriphery();
U0Init();
InitSPI();
InitLCD();
Backlight(BKLGHT_LCD_ON);
while(1)
{
//Left SW
if(!((AT91C_BASE_PIOB->PIO_PDSR) & BIT24))
{
Backlight(BKLGHT_LCD_ON);
}
//Right SW
if(!((AT91C_BASE_PIOB->PIO_PDSR) & BIT25))
{
Backlight(BKLGHT_LCD_OFF);
}
//Joy Center
if(!((AT91C_BASE_PIOA->PIO_PDSR) & BIT15))
{
char tmp[] = "000";
tmp[2] = uart_count_rx_irq % 10 + '0';
tmp[1] = (uart_count_rx_irq / 10) % 10 + '0';
tmp[0] = (uart_count_rx_irq / 100) % 10 + '0';
LCDPutStr(tmp, 104, 0, LARGE, BLACK, WHITE);
tmp[2] = uart_count_rx_sim % 10 + '0';
tmp[1] = (uart_count_rx_sim / 10) % 10 + '0';
tmp[0] = (uart_count_rx_sim / 100) % 10 + '0';
LCDPutStr(tmp, 88, 0, LARGE, BLACK, WHITE);
}
// if(AT91C_BASE_US0->US_CSR & AT91C_US_RXRDY)
// {
// U0WriteChar(U0ReadChar());
// uart_count_rx_sim++;
// }
}
}
Sam7ex256 и UART, Не срабатывает прерывание
Dec 9 2009, 08:05
