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add fast bulk read

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This commit is contained in:
david
2009-06-24 10:38:59 +02:00
parent b8bd7acfa3
commit 465ea1fbfe
4 changed files with 61 additions and 4 deletions
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55
avr/usbload/sram.c
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@@ -97,16 +97,64 @@ void sreg_set(uint32_t addr)
}
void sram_bulk_read_start(uint32_t addr)
{
#ifdef DEBUG_SRAM
printf("sram_bulk_read_start: addr=0x%08lx\n\r", addr);
#endif
avr_data_in();
AVR_WR_PORT |= (1 << AVR_WR_PIN);
AVR_RD_PORT |= (1 << AVR_RD_PIN);
AVR_CS_PORT &= ~(1 << AVR_CS_PIN);
sreg_set(addr);
AVR_RD_PORT &= ~(1 << AVR_RD_PIN);
}
void sram_bulk_read_end(void)
{
#ifdef DEBUG_SRAM
printf("sram_bulk_read_end:");
#endif
AVR_CS_PORT |= (1 << AVR_CS_PIN);
avr_data_in();
}
inline uint8_t sram_bulk_read(void)
{
uint8_t byte;
AVR_RD_PORT |= (1 << AVR_RD_PIN);
counter_up();
AVR_RD_PORT &= ~(1 << AVR_RD_PIN);
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
byte = AVR_DATA_PIN;
AVR_RD_PORT |= (1 << AVR_RD_PIN);
return byte;
}
uint8_t sram_read(uint32_t addr)
{
uint8_t byte;
#ifdef DEBUG_SRAM
printf("sram_read: addr=0x%08lx\n\r", addr);
#endif
avr_data_in();
AVR_CS_PORT &= ~(1 << AVR_CS_PIN);
AVR_WR_PORT |= (1 << AVR_WR_PIN);
AVR_RD_PORT |= (1 << AVR_RD_PIN);
AVR_CS_PORT &= ~(1 << AVR_CS_PIN);
sreg_set(addr);
@@ -133,6 +181,11 @@ uint8_t sram_read(uint32_t addr)
void sram_write(uint32_t addr, uint8_t data)
{
#ifdef DEBUG_SRAM
printf("sram_write: addr=0x%08lx data=%x\n\r", addr, data);
#endif
avr_data_out();
AVR_CS_PORT &= ~(1 << AVR_CS_PIN);