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ARM: implement SET_INPUT() and READ(). 

Tested and found to work. Excellent.

Test code before main():

static void delay(uint32_t delay) {
  while (delay) {
    __ASM volatile ("nop");
    delay--;
  }
}

Test code in main():

  SET_INPUT(PIO0_1);
  SET_INPUT(PIO0_2);
  SET_INPUT(PIO0_3);
  SET_INPUT(PIO0_4);

  delay(5000000);
  while (1) {
    sersendf_P(PSTR("\nPIO0_1  PIO"));
    delay(100000);
    sersendf_P(PSTR("0_2  PIO0_3"));
    delay(100000);
    sersendf_P(PSTR("  PIO0_4\n"));
    delay(100000);
    sersendf_P(PSTR("  %sx"), READ(PIO0_1));
    delay(100000);
    sersendf_P(PSTR("    %sx"), READ(PIO0_2));
    delay(100000);
    sersendf_P(PSTR("    %sx"), READ(PIO0_3));
    delay(100000);
    // PIO0_4 works, but the chip doesn't allow to set a pullup.
    sersendf_P(PSTR("    %sx\n"), READ(PIO0_4));
    delay(5000000);
  }
This commit is contained in:
Markus Hitter 2015-07-23 19:22:37 +02:00
parent 072e3f8ae5
commit 45bcef395e
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
pinio.h
View File

@ -56,6 +56,8 @@
See chapter 12 in the LPC111x User Manual. A read-modify-write cycle like See chapter 12 in the LPC111x User Manual. A read-modify-write cycle like
on AVR costs 5 clock cycles, this implementation works with 3 clock cycles. on AVR costs 5 clock cycles, this implementation works with 3 clock cycles.
*/ */
/// Read a pin.
#define _READ(IO) (IO ## _PORT->MASKED_ACCESS[MASK(IO ## _PIN)])
/// Write to a pin. /// Write to a pin.
#define _WRITE(IO, v) \ #define _WRITE(IO, v) \
do { \ do { \
@ -69,6 +71,12 @@
GPIO behavior. Peripherals using these pins may have to change this and GPIO behavior. Peripherals using these pins may have to change this and
should do so in their own context. should do so in their own context.
*/ */
/// Set pin as input.
#define _SET_INPUT(IO) \
do { \
LPC_IOCON->IO ## _CMSIS = (IO ## _OUTPUT | IO_MODEMASK_REPEATER); \
IO ## _PORT->DIR &= ~MASK(IO ## _PIN); \
} while (0)
/// Set pin as output. /// Set pin as output.
#define _SET_OUTPUT(IO) \ #define _SET_OUTPUT(IO) \
do { \ do { \