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Working baseline, works with -O0 -- -O3 AND -O0 with gcc 4.9.3 Ubuntu. TX to RX switch timing is the challenge. IOArduino.cpp may not work

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This commit is contained in:
danilo 2017-03-31 19:14:17 +02:00
parent 3a4451684f
commit aefe492f9b
5 changed files with 102 additions and 69 deletions
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83
IOSTM.cpp
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@ -17,6 +17,7 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "Config.h"
#if defined(STM32F10X_MD)
@ -239,39 +240,6 @@ extern "C" {
#endif
}
/**
* Function delay_us() from stm32duino project
*
* @brief Delay the given number of microseconds.
*
* @param us Number of microseconds to delay.
*/
static inline void delay_us(uint32_t us) {
us *= 12;
/* fudge for function call overhead */
us--;
asm volatile(" mov r0, %[us] \n\t"
"1: subs r0, #1 \n\t"
" bhi 1b \n\t"
:
: [us] "r" (us)
: "r0");
}
void CIO::delay_rx() {
#if defined(BIDIR_DATA_PIN)
delay_us(290);
#else
delay_us(340);
#endif
}
void CIO::dlybit(void)
{
delay_us(1);
}
void CIO::Init()
{
// USB Conf IO:
@ -532,6 +500,8 @@ bool CIO::CLK_pin()
void CIO::RXD_pin_write(bool on)
{
GPIO_WriteBit(PORT_RXD, PIN_RXD, on ? Bit_SET : Bit_RESET);
GPIO_WriteBit(PORT_YSF_LED, PIN_YSF_LED, on ? Bit_SET : Bit_RESET);
GPIO_WriteBit(PORT_YSF_LED, PIN_YSF_LED, on ? Bit_SET : Bit_RESET);
}
#endif
@ -580,4 +550,51 @@ void CIO::COS_pin(bool on)
GPIO_WriteBit(PORT_COS_LED, PIN_COS_LED, on ? Bit_SET : Bit_RESET);
}
/**
* Function delay_us() from stm32duino project
*
* @brief Delay the given number of microseconds.
*
* @param us Number of microseconds to delay.
*/
static inline void delay_us(uint32_t us) {
us *= 12;
/* fudge for function call overhead */
us--;
asm volatile(" mov r0, %[us] \n\t"
"1: subs r0, #1 \n\t"
" bhi 1b \n\t"
:
: [us] "r" (us)
: "r0");
}
void CIO::delay_rx() {
#if defined(BIDIR_DATA_PIN)
delay_us(290);
#else
delay_us(340);
#endif
}
// TODO: Investigate why. In fact there is just a single place where this is being use
// during normal operation
// it seems that optimizing this code breaks some timings
#pragma GCC optimize ("O0")
static inline void delay_ns() {
asm volatile("mov r8, r8 \n\t"
"mov r8, r8 \n\t"
"mov r8, r8 \n\t"
);
}
void CIO::dlybit(void)
{
delay_ns();
}
#endif