#define CLOCK_SETUP 1 #include "LPC8xx.h" #define MASTER_STATE_MASK(0x7<<1) #define STAT_MSTPEND (1 << 0) #define STAT_MSTRX (0x1 << 1) #define STAT_MSTTX (0x2 << 1) #define I2C_SMODE_PRE_DIV(90-1) #define CFG_MSTENA(1 << 0) #define STAT_MSTARBLOSS(1 << 4) #define STAT_MSTSSERR (1 << 6) #define TIM_MSTSCLLOW(d)((d) << 0) #define TIM_MSTSCLHIGH(d)((d) << 4) #define CTL_MSTCONTINUE(1 << 0) #define CTL_MSTSTART(1 << 1) #define CTL_MSTSTOP (1 << 2) uint32_t I2CInterruptCount = 0; uint32_t I2CMstRXCount = 0; uint32_t I2CMstTXCount = 0; uint32_t msttxrdy = 0; uint32_t mstrxrdy = 0; LPC_I2C_TypeDef *I2Cx = (LPC_I2C_TypeDef*) LPC_I2C_BASE; void I2C_IRQHandler(void) { uint32_t active = LPC_I2C->INTSTAT; uint32_t i2cmststate = LPC_I2C->STAT & MASTER_STATE_MASK; I2CInterruptCount++; <<--- Never called!!! if ( active & STAT_MSTPEND ) { LPC_I2C->INTENCLR = STAT_MSTPEND; switch ( i2cmststate ) { case STAT_MSTRX: I2CMstRXCount++; mstrxrdy = 1; break; case STAT_MSTTX: I2CMstTXCount++; msttxrdy = 1; break; } } } int main(void) { uint32_t i, regVal; SystemInit(); SystemCoreClockUpdate(); /* Initialize I2C pin connect */ /* connect the I2C SCL and SDA sigals to port pins(P0.10-P0.11)*/ regVal = LPC_SWM->PINASSIGN7 & ~(0xFFUL<<24); LPC_SWM->PINASSIGN7 = regVal | (10 << 24);/* P0.10 is I2C SDA, ASSIGN0(31:24) */ regVal = LPC_SWM->PINASSIGN8 & ~(0xFF<<0); LPC_SWM->PINASSIGN8 = regVal | (11 << 0);/* P0.11 is I2C SCL. ASSIGN0(7:0) */ /* Enable I2C clock */ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<5); /* Toggle peripheral reset control to I2C, a "1" bring it out of reset. */ LPC_SYSCON->PRESETCTRL &= ~(0x1<<6); LPC_SYSCON->PRESETCTRL |= (0x1<<6); /* setup I2C */ uint32_t dutycycle = 0; I2Cx->DIV = I2C_SMODE_PRE_DIV; I2Cx->CFG &= ~(CFG_MSTENA); msttxrdy = mstrxrdy = 0; I2Cx->MSTTIME = TIM_MSTSCLLOW(dutycycle) | TIM_MSTSCLHIGH(dutycycle); I2Cx->INTENSET |= ( STAT_MSTARBLOSS | STAT_MSTSSERR ); NVIC_EnableIRQ(I2C_IRQn); I2Cx->CFG |= CFG_MSTENA; // uint8_t addr = 0x3F << 1; uint32_t len = 2; uint8_t tx[len]; tx[0] = 0xFF; tx[1] = 0xFF; I2Cx->MSTDAT = addr; I2Cx->MSTCTL = CTL_MSTSTART; msttxrdy = 0; I2Cx->INTENSET = STAT_MSTPEND; for ( i = 0; i < len; i++ ) { while(!msttxrdy); <<--- Here, the program hangs. msttxrdy = 0; I2Cx->MSTDAT = tx; I2Cx->MSTCTL = CTL_MSTCONTINUE; I2Cx->INTENSET = STAT_MSTPEND; } while(1); return 0; }
