nes-proj/cpu/arm/stm32f103/debug-uart.c

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2009-07-12 15:52:28 +00:00
#include <debug-uart.h>
#include <string.h>
#include <stm32f10x_map.h>
#include <stm32f10x_dma.h>
#include <gpio.h>
#include <nvic.h>
#ifndef DBG_UART
#define DBG_UART USART1
#endif
#ifndef DBG_DMA_NO
#define DBG_DMA_NO 1
#endif
#ifndef DBG_DMA_CHANNEL_NO
#define DBG_DMA_CHANNEL_NO 4
#endif
#define _DBG_DMA_NAME(x) DMA##x
#define DBG_DMA_NAME(x) _DBG_DMA_NAME(x)
#define DBG_DMA DBG_DMA_NAME(DBG_DMA_NO)
#define _DMA_CHANNEL_NAME(x,c) DMA ## x ## _Channel ## c
#define DMA_CHANNEL_NAME(x,c) _DMA_CHANNEL_NAME(x,c)
#define DBG_DMA_CHANNEL DMA_CHANNEL_NAME(DBG_DMA_NO, DBG_DMA_CHANNEL_NO)
#define _DBG_DMA_CHANNEL_IFCR_CGIF(c) DMA_IFCR_CGIF ## c
#define _XDBG_DMA_CHANNEL_IFCR_CGIF(c) _DBG_DMA_CHANNEL_IFCR_CGIF(c)
#define DBG_DMA_CHANNEL_IFCR_CGIF \
_XDBG_DMA_CHANNEL_IFCR_CGIF(DBG_DMA_CHANNEL_NO)
#ifndef DBG_XMIT_BUFFER_LEN
#define DBG_XMIT_BUFFER_LEN 1024
#endif
static unsigned char xmit_buffer[DBG_XMIT_BUFFER_LEN];
#define XMIT_BUFFER_END &xmit_buffer[DBG_XMIT_BUFFER_LEN]
void
dbg_setup_uart_default()
{
RCC->APB2ENR |= (RCC_APB2ENR_AFIOEN
| RCC_APB2ENR_IOPAEN| RCC_APB2ENR_IOPBEN
| RCC_APB2ENR_USART1EN );
RCC->AHBENR |= RCC_AHBENR_DMA1EN;
AFIO_REMAP( AFIO_MAPR_USART1_REMAP, AFIO_MAPR_USART1_REMAP);
GPIO_CONF_OUTPUT_PORT(B,6,ALT_PUSH_PULL,50);
GPIO_CONF_INPUT_PORT(B,7,FLOATING);
USART1->CR1 = USART_CR1_UE;
USART1->CR2 = 0;
USART1->CR3 = USART_CR3_DMAT;
USART1->CR1 |= USART_CR1_TE;
USART1->BRR= 0x1a1;
}
/* Valid data in head to tail-1 */
/* Read position */
static unsigned char * volatile xmit_buffer_head = xmit_buffer;
/* Write position */
static unsigned char * volatile xmit_buffer_tail = xmit_buffer;
/* xmit_buffer_head == xmit_buffer_tail means empty so we can only store
DBG_XMIT_BUFFER_LEN-1 characters */
volatile unsigned char dma_running = 0;
static unsigned char * volatile dma_end;
void
DMA1_Channel4_handler() __attribute__((interrupt));
static void
update_dma(void)
{
if (xmit_buffer_tail == xmit_buffer_head) return;
DBG_DMA_CHANNEL->CCR = (DMA_Priority_Low |
DMA_PeripheralDataSize_Byte |
DMA_MemoryDataSize_Byte |
DMA_PeripheralInc_Disable |
DMA_MemoryInc_Enable |
DMA_Mode_Normal |
DMA_DIR_PeripheralDST |
DMA_CCR4_TCIE
);
DBG_DMA_CHANNEL->CPAR = (u32)&DBG_UART->DR;
DBG_DMA_CHANNEL->CMAR = (u32)xmit_buffer_head;
if (xmit_buffer_head < xmit_buffer_tail) {
DBG_DMA_CHANNEL->CNDTR = xmit_buffer_tail - xmit_buffer_head;
dma_end = xmit_buffer_tail;
} else {
DBG_DMA_CHANNEL->CNDTR = XMIT_BUFFER_END - xmit_buffer_head;
dma_end = xmit_buffer;
}
NVIC_ENABLE_INT(DMA1_Channel4_IRQChannel);
NVIC_SET_PRIORITY(DMA1_Channel4_IRQChannel, 2);
DBG_DMA_CHANNEL->CCR |=DMA_CCR4_EN;
}
void
DMA1_Channel4_handler()
{
DBG_DMA->IFCR = DBG_DMA_CHANNEL_IFCR_CGIF;
xmit_buffer_head = dma_end;
if (xmit_buffer_tail == xmit_buffer_head) {
dma_running = 0;
return;
}
update_dma();
}
unsigned int
dbg_send_bytes(const unsigned char *seq, unsigned int len)
{
/* Since each of the pointers should be read atomically
there's no need to disable interrupts */
unsigned char *head = xmit_buffer_head;
unsigned char *tail = xmit_buffer_tail;
if (tail >= head) {
/* Free space wraps */
unsigned int xfer_len = XMIT_BUFFER_END - tail;
unsigned int free = DBG_XMIT_BUFFER_LEN - (tail - head) - 1;
if (len > free) len = free;
if (xfer_len < len) {
memcpy(tail, seq, xfer_len);
seq += xfer_len;
xfer_len = len - xfer_len;
memcpy(xmit_buffer, seq, xfer_len);
tail = xmit_buffer + xfer_len;
} else {
memcpy(tail, seq, len);
tail += len;
if (tail == XMIT_BUFFER_END) tail = xmit_buffer;
}
} else {
/* Free space continuous */
unsigned int free = (head - tail) - 1;
if (len > free) len = free;
memcpy(tail, seq, len);
tail += len;
}
xmit_buffer_tail = tail;
if (!dma_running) {
dma_running = 1;
update_dma();
}
return len;
}
static unsigned char dbg_write_overrun = 0;
void
dbg_putchar(const char ch)
{
if (dbg_write_overrun) {
if (dbg_send_bytes((const unsigned char*)"^",1) != 1) return;
}
dbg_write_overrun = 0;
if (dbg_send_bytes((const unsigned char*)&ch,1) != 1) {
dbg_write_overrun = 1;
}
}
void
dbg_blocking_putchar(const char ch)
{
if (dbg_write_overrun) {
while (dbg_send_bytes((const unsigned char*)"^",1) != 1);
}
dbg_write_overrun = 0;
while (dbg_send_bytes((const unsigned char*)&ch,1) != 1);
}
void
dbg_drain()
{
while(xmit_buffer_tail != xmit_buffer_head);
}