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added interrupt based uarts.

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This commit is contained in:
Mariano Alvira 2010-03-09 18:23:40 -05:00
parent db145ed8a4
commit 67aed03b1d
17 changed files with 134 additions and 61 deletions
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43
lib/include/uart1.h
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@ -3,16 +3,43 @@
#include <types.h>
#define UART1_CON ((volatile uint32_t *) 0x80005000)
#define UART1_STAT ((volatile uint32_t *) 0x80005004)
#define UART1_DATA ((volatile uint32_t *) 0x80005008)
#define UR1CON ((volatile uint32_t *) 0x8000500c)
#define UT1CON ((volatile uint32_t *) 0x80005010)
#define UART1_CTS ((volatile uint32_t *) 0x80005014)
#define UART1_BR ((volatile uint32_t *) 0x80005018)
#define UCON (0)
/* UCON bits */
#define UCON_SAMP 10
#define UCON_SAMP_8X 0
#define UCON_SAMP_16X 1
#define USTAT (0x04)
#define UDATA (0x08)
#define URXCON (0x0c)
#define UTXCON (0x10)
#define UCTS (0x14)
#define UBRCNT (0x18)
#define UART1_BASE (0x80005000)
#define UART2_BASE (0x8000b000)
#define UART1_UCON ((volatile uint32_t *) ( UART1_BASE + UCON ))
#define UART1_USTAT ((volatile uint32_t *) ( UART1_BASE + USTAT ))
#define UART1_UDATA ((volatile uint32_t *) ( UART1_BASE + UDATA ))
#define UART1_URXCON ((volatile uint32_t *) ( UART1_BASE + URXCON ))
#define UART1_UTXCON ((volatile uint32_t *) ( UART1_BASE + UTXCON ))
#define UART1_UCTS ((volatile uint32_t *) ( UART1_BASE + UCTS ))
#define UART1_UBRCNT ((volatile uint32_t *) ( UART1_BASE + UBRCNT ))
#define UART2_UCON ((volatile uint32_t *) ( UART2_BASE + UCON ))
#define UART2_USTAT ((volatile uint32_t *) ( UART2_BASE + USTAT ))
#define UART2_UDATA ((volatile uint32_t *) ( UART2_BASE + UDATA ))
#define UART2_URXCON ((volatile uint32_t *) ( UART2_BASE + URXCON ))
#define UART2_UTXCON ((volatile uint32_t *) ( UART2_BASE + UTXCON ))
#define UART2_UCTS ((volatile uint32_t *) ( UART2_BASE + UCTS ))
#define UART2_UBRCNT ((volatile uint32_t *) ( UART2_BASE + UBRCNT ))
extern volatile uint32_t u1_head, u1_tail;
void uart1_putc(char c);
#define uart1_can_get() (*UART1_URXCON > 0)
uint8_t uart1_getc(void);
#define uart1_can_get() (*UR1CON > 0)
#endif

37
lib/uart1.c
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@ -1,6 +1,37 @@
#include <uart1.h>
#include <mc1322x.h>
#include <types.h>
volatile char u1_tx_buf[1024];
volatile uint32_t u1_head, u1_tail;
void uart1_isr(void) {
while( *UART1_UTXCON != 0 ) {
if (u1_head == u1_tail) {
disable_irq(UART1);
return;
}
*UART1_UDATA = u1_tx_buf[u1_tail];
u1_tail++;
if (u1_tail >= sizeof(u1_tx_buf))
u1_tail = 0;
}
enable_irq(UART1);
}
void uart1_putc(char c) {
while(*UT1CON == 31); /* wait for there to be room in the buffer */
*UART1_DATA = c;
uint32_t h = u1_head;
h = u1_head + 1;
if (h >= sizeof(u1_tx_buf))
h = 0;
if (h == u1_tail) /* drop chars when no room */
return;
u1_tx_buf[u1_head] = c;
u1_head = h;
uart1_isr();
}
uint8_t uart1_getc(void) {
while(uart1_can_get() == 0) { continue; }
return *UART1_UDATA;
}

25
src/default_lowlevel.c
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@ -1,5 +1,5 @@
#include <mc1322x.h>
#include <types.h>
#include <crm.h>
void default_vreg_init(void) {
volatile uint32_t i;
@ -9,3 +9,26 @@ void default_vreg_init(void) {
// while((((*(volatile uint32_t *)(0x80003018))>>17) & 1) !=1) { continue; } /* wait for the bypass to take */
*CRM_VREG_CNTL = 0x00000ff8; /* start the regulators */
}
void uart1_init(uint16_t inc, uint16_t mod, uint8_t samp) {
uint8_t i;
/* UART must be disabled to set the baudrate */
*UART1_UCON = 0;
*UART1_UBRCNT = ( inc << 16 ) | mod;
/* see Section 11.5.1.2 Alternate Modes */
/* you must enable the peripheral first BEFORE setting the function in GPIO_FUNC_SEL */
/* From the datasheet: "The peripheral function will control operation of the pad IF */
/* THE PERIPHERAL IS ENABLED. */
*UART1_UCON = (1 << 0) | (1 << 1); /* enable receive, transmit */
if(samp == UCON_SAMP_16X)
set_bit(*UART1_UCON,UCON_SAMP);
*GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) | (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/
/* interrupt when 28 bytes are free */
*UART1_UTXCON = 28;
u1_head = 0; u1_tail = 0;
enable_irq(UART1);
}

2
src/default_lowlevel.h
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@ -3,4 +3,6 @@
void default_vreg_init(void);
void uart1_init(uint16_t inc, uint16_t mod, uint8_t samp);
#endif

9
tests/config.h
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@ -2,9 +2,14 @@
#define CONFIG_H
/* Baud rate */
/* INC = 767; MOD = 9999 works: 115200 @ 24 MHz 16 bit sample */
#define INC 767
#define MOD 9999
/* 230400 bps, INC=767, MOD=9999, 24Mhz 16x samp */
/* 115200 bps, INC=767, MOD=9999, 24Mhz 8x samp */
#define INC 767
/* 921600 bps, MOD=9999, 24Mhz 16x samp */
//#define INC 3071
#define SAMP UCON_SAMP_8X
//#define SAMP UCON_SAMP_16X
/* use uart1 for console */
#define uart_init uart1_init

29
tests/flasher.c
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@ -19,7 +19,16 @@
#define dbg_put_hex32(...)
#endif
uint8_t getc(void);
uint8_t getc(void)
{
volatile uint8_t c;
while(*UART1_URXCON == 0);
c = *UART1_UDATA;
return c;
}
void flushrx(void);
uint32_t to_u32(volatile uint32_t *c);
@ -41,7 +50,8 @@ void main(void) {
volatile uint32_t addr,data;
uart_init(INC, MOD);
uart_init(INC, MOD, SAMP);
disable_irq(UART1);
vreg_init();
@ -73,7 +83,7 @@ void main(void) {
/* read the length */
for(i=0; i<4; i++) {
c = getc();
c = uart1_getc();
/* bail if the first byte of the length is zero */
len += (c<<(i*8));
}
@ -158,8 +168,8 @@ void main(void) {
void flushrx(void)
{
volatile uint8_t c;
while(*UR1CON !=0) {
c = *UART1_DATA;
while(*UART1_URXCON !=0) {
c = *UART1_UDATA;
}
}
@ -199,12 +209,5 @@ uint32_t to_u32(volatile uint32_t *c)
return ret;
}
uint8_t getc(void)
{
volatile uint8_t c;
while(*UR1CON == 0);
c = *UART1_DATA;
return c;
}

2
tests/nvm-read.c
View File

@ -10,7 +10,7 @@ void main(void) {
uint32_t buf[READ_NBYTES/4];
uint32_t i;
uart_init(INC, MOD);
uart_init(INC, MOD, SAMP);
print_welcome("nvm-read");

2
tests/nvm-write.c
View File

@ -10,7 +10,7 @@ void main(void) {
uint32_t buf[WRITE_NBYTES/4];
uint32_t i;
uart_init(INC, MOD);
uart_init(INC, MOD, SAMP);
print_welcome("nvm-write");

2
tests/printf.c
View File

@ -15,7 +15,7 @@ int main(void)
int mi;
// char buf[80];
uart_init(INC, MOD);
uart_init(INC, MOD, SAMP);
mi = (1 << (bs-1)) + 1;
printf("%s\n", ptr);

6
tests/put.c
View File

@ -5,8 +5,10 @@ const uint8_t hex[16]={'0','1','2','3','4','5','6','7',
'8','9','a','b','c','d','e','f'};
void putchr(char c) {
while(*UT1CON == 31); /* wait for there to be room in the buffer */
*UART1_DATA = c;
while(*UART1_UTXCON == 31);
/* wait for there to be room in the buffer */
// while( *UART1_UTXCON == 0 ) { continue; }
*UART1_UDATA = c;
}
void putstr(char *s) {

2
tests/rftest-rx.c
View File

@ -25,7 +25,7 @@ void main(void) {
/* trim the reference osc. to 24MHz */
pack_XTAL_CNTL(CTUNE_4PF, CTUNE, FTUNE, IBIAS);
uart_init(INC,MOD);
uart_init(INC, MOD, SAMP);
vreg_init();

2
tests/rftest-tx.c
View File

@ -35,7 +35,7 @@ void main(void) {
/* trim the reference osc. to 24MHz */
pack_XTAL_CNTL(CTUNE_4PF, CTUNE, FTUNE, IBIAS);
uart_init(INC,MOD);
uart_init(INC, MOD, SAMP);
vreg_init();

4
tests/romimg.c
View File

@ -7,10 +7,10 @@
void main(void) {
volatile uint8_t *data;
uart_init(INC, MOD);
uart_init(INC, MOD, SAMP);
for(data = DUMP_BASE; data < ((uint8_t *)(DUMP_BASE+DUMP_LEN)); data++) {
putchr(*data);
uart1_putc(*data);
}
while(1);

2
tests/sleep.c
View File

@ -6,7 +6,7 @@
void main(void) {
uart_init(INC,MOD);
uart_init(INC,MOD,SAMP);
*mem32(0x00401ffc) = 0x01234567;
*mem32(0x00407ffc) = 0xdeadbeef;

18
tests/tests.c
View File

@ -4,24 +4,6 @@
#include "put.h"
#include "tests.h"
void uart1_init(uint16_t inc, uint16_t mod) {
/* Restore UART regs. to default */
/* in case there is still bootloader state leftover */
*UART1_CON = 0x0000c800; /* mask interrupts, 16 bit sample --- helps explain the baud rate */
/* INC = 767; MOD = 9999 works: 115200 @ 24 MHz 16 bit sample */
*UART1_BR = (inc << 16) | mod;
/* see Section 11.5.1.2 Alternate Modes */
/* you must enable the peripheral first BEFORE setting the function in GPIO_FUNC_SEL */
/* From the datasheet: "The peripheral function will control operation of the pad IF */
/* THE PERIPHERAL IS ENABLED. */
*UART1_CON = 0x00000003; /* enable receive and transmit */
*GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) | (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/
}
void print_welcome(char* testname) {
printf("mc1322x-test: %s\n\r",testname);
printf("board: %s\n\r", STR2(BOARD));

1
tests/tests.h
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@ -6,7 +6,6 @@
#define NL "\033[K\r\n"
void uart1_init(uint16_t inc, uint16_t mod);
void print_welcome(char* testname);
void dump_regs(uint32_t base, uint32_t len);
void print_packet(volatile packet_t *p);

9
tests/uart1-loopback.c
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@ -5,16 +5,15 @@
#include "config.h"
void main(void) {
volatile char c;
uart1_init(INC,MOD);
uart1_init(INC,MOD,SAMP);
uint8_t c;
while(1) {
if(*UART1_CON > 0) {
if(uart1_can_get()) {
/* Receive buffer isn't empty */
/* read a byte and write it to the transmit buffer */
c = *UART1_DATA;
*UART1_DATA = c;
uart1_putc(uart1_getc());
}
}