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iceman1001
2019-04-22 19:31:22 +02:00
parent 3bd145652b
commit 04536a3564
1 changed files with 2 additions and 3 deletions
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5
common/i2c.c
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@@ -26,7 +26,8 @@
volatile unsigned long c; volatile unsigned long c;
// 直接使用循环来延时，一个循环 6 条指令，48M， Delay=1 大概为 200kbps // Direct use the loop to delay. 6 instructions loop, Masterclock 48Mhz,
// delay=1 is about 200kbps
// timer. // timer.
// I2CSpinDelayClk(4) = 12.31us // I2CSpinDelayClk(4) = 12.31us
// I2CSpinDelayClk(1) = 3.07us // I2CSpinDelayClk(1) = 3.07us
@@ -89,11 +90,9 @@ void I2C_init(void) {
AT91C_BASE_PIOA->PIO_OER |= (GPIO_SCL | GPIO_SDA | GPIO_RST); AT91C_BASE_PIOA->PIO_OER |= (GPIO_SCL | GPIO_SDA | GPIO_RST);
AT91C_BASE_PIOA->PIO_PER |= (GPIO_SCL | GPIO_SDA | GPIO_RST); AT91C_BASE_PIOA->PIO_PER |= (GPIO_SCL | GPIO_SDA | GPIO_RST);
bool isok = (SCL_read && SDA_read); bool isok = (SCL_read && SDA_read);
if (!isok) if (!isok)
I2C_recovery(); I2C_recovery();
} }
// set the reset state // set the reset state