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- /*
- uart.c: UART access routines
- */
- #include <arm/NXP/LPC17xx/LPC17xx.h>
- #include "bits.h"
- #include "config.h"
- #include "uart.h"
- #include "led.h"
- /*static uint8_t uart_lookupratio(float f_fr) {
- uint16_t errors[72]={0,67,71,77,83,91,100,111,125,
- 133,143,154,167,182,200,214,222,231,
- 250,267,273,286,300,308,333,357,364,
- 375,385,400,417,429,444,455,462,467,
- 500,533,538,545,556,571,583,600,615,
- 625,636,643,667,692,700,714,727,733,
- 750,769,778,786,800,818,833,846,857,
- 867,875,889,900,909,917,923,929,933};
- uint8_t ratios[72]={0x10,0xf1,0xe1,0xd1,0xc1,0xb1,0xa1,0x91,0x81,
- 0xf2,0x71,0xd2,0x61,0xb2,0x51,0xe3,0x92,0xd3,
- 0x41,0xf4,0xb3,0x72,0xa3,0xd4,0x31,0xe5,0xb4,
- 0x83,0xd5,0x52,0xc5,0x73,0x94,0xb5,0xd6,0xf7,
- 0x21,0xf8,0xd7,0xb6,0x95,0x74,0xc7,0x53,0xd8,
- 0x85,0xb7,0xe9,0x32,0xd9,0xa7,0x75,0xb8,0xfb,
- 0x43,0xda,0x97,0xeb,0x54,0xb9,0x65,0xdb,0x76,
- 0xfd,0x87,0x98,0xa9,0xba,0xcb,0xdc,0xed,0xfe};
- int fr = (f_fr-1)*1000;
- int i=0, i_result=0;
- int err=0, lasterr=1000;
- for(i=0; i<72; i++) {
- if(fr<errors[i]) {
- err=errors[i]-fr;
- } else {
- err=fr-errors[i];
- }
- if(err<lasterr) {
- i_result=i;
- lasterr=err;
- }
- }
- return ratios[i_result];
- }
- */
- /*static uint32_t baud2divisor(unsigned int baudrate) {
- uint32_t int_ratio;
- uint32_t error;
- uint32_t dl=0;
- float f_ratio;
- float f_fr;
- float f_dl;
- float f_pclk = (float)CONFIG_CPU_FREQUENCY / CONFIG_UART_PCLKDIV;
- uint8_t fract_ratio;
- f_ratio=(f_pclk / 16 / baudrate);
- int_ratio = (int)f_ratio;
- error=(f_ratio*1000)-(int_ratio*1000);
- if(error>990) {
- int_ratio++;
- } else if(error>10) {
- f_fr=1.5;
- f_dl=f_pclk / (16 * baudrate * (f_fr));
- dl = (int)f_dl;
- f_fr=f_pclk / (16 * baudrate * dl);
- fract_ratio = uart_lookupratio(f_fr);
- }
- if(!dl) {
- return int_ratio;
- } else {
- return ((fract_ratio<<16)&0xff0000) | dl;
- }
- }
- */
- //static char txbuf[1 << CONFIG_UART_TX_BUF_SHIFT];
- static volatile unsigned int read_idx, write_idx;
- void uart_putc( char c )
- {
- if ( c == '\n' )
- {
- uart_putc( '\r' );
- }
- while ( !( UART_REGS->LSR & ( 0x20 ) ) );
- UART_REGS->THR = c;
- }
- /* Polling version only */
- unsigned char uart_getc( void )
- {
- /* wait for character */
- while ( !( BITBANG( UART_REGS->LSR, 0 ) ) ) ;
- return UART_REGS->RBR;
- }
- /* Returns true if a char is ready */
- unsigned char uart_gotc( void )
- {
- return BITBANG( UART_REGS->LSR, 0 );
- }
- void uart_init( void )
- {
- uint32_t div;
- /* Turn on power to UART */
- BITBANG( LPC_SC->PCONP, UART_PCONBIT ) = 1;
- /* UART clock = CPU clock - this block is reduced at compile-time */
- if ( CONFIG_UART_PCLKDIV == 1 )
- {
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT ) = 1;
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT + 1 ) = 0;
- }
- else if ( CONFIG_UART_PCLKDIV == 2 )
- {
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT ) = 0;
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT + 1 ) = 1;
- }
- else if ( CONFIG_UART_PCLKDIV == 4 )
- {
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT ) = 0;
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT + 1 ) = 0;
- }
- else // Fallback: Divide by 8
- {
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT ) = 1;
- BITBANG( LPC_SC->UART_PCLKREG, UART_PCLKBIT + 1 ) = 1;
- }
- /* set baud rate - no fractional stuff for now */
- UART_REGS->LCR = BV( 7 ) | 3; // always 8n1
- div = 0xF80022; //0x850004; // baud2divisor(CONFIG_UART_BAUDRATE);
- UART_REGS->DLL = div & 0xff;
- UART_REGS->DLM = ( div >> 8 ) & 0xff;
- BITBANG( UART_REGS->LCR, 7 ) = 0;
- if ( div & 0xff0000 )
- {
- UART_REGS->FDR = ( div >> 16 ) & 0xff;
- }
- /* reset and enable FIFO */
- UART_REGS->FCR = BV( 0 );
- UART_REGS->THR = '?';
- }
- /* --- generic code below --- */
- void uart_puthex( uint8_t num )
- {
- uint8_t tmp;
- tmp = ( num & 0xf0 ) >> 4;
- if ( tmp < 10 )
- {
- uart_putc( '0' + tmp );
- }
- else
- {
- uart_putc( 'a' + tmp - 10 );
- }
- tmp = num & 0x0f;
- if ( tmp < 10 )
- {
- uart_putc( '0' + tmp );
- }
- else
- {
- uart_putc( 'a' + tmp - 10 );
- }
- }
- void uart_trace( void *ptr, uint16_t start, uint16_t len )
- {
- uint16_t i;
- uint8_t j;
- uint8_t ch;
- uint8_t *data = ptr;
- data += start;
- for ( i = 0; i < len; i += 16 )
- {
- uart_puthex( start >> 8 );
- uart_puthex( start & 0xff );
- uart_putc( '|' );
- uart_putc( ' ' );
- for ( j = 0; j < 16; j++ )
- {
- if ( i + j < len )
- {
- ch = *( data + j );
- uart_puthex( ch );
- }
- else
- {
- uart_putc( ' ' );
- uart_putc( ' ' );
- }
- uart_putc( ' ' );
- }
- uart_putc( '|' );
- for ( j = 0; j < 16; j++ )
- {
- if ( i + j < len )
- {
- ch = *( data++ );
- if ( ch < 32 || ch > 0x7e )
- {
- ch = '.';
- }
- uart_putc( ch );
- }
- else
- {
- uart_putc( ' ' );
- }
- }
- uart_putc( '|' );
- uart_putcrlf();
- start += 16;
- }
- }
- void uart_flush( void )
- {
- while ( read_idx != write_idx ) ;
- }
- void uart_puts( const char *text )
- {
- while ( *text )
- {
- uart_putc( *text++ );
- }
- }
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