Hard fault writing LPSPI0->TDR

nobodyKnows — Wed, 26 Apr 2023 14:03:37 GMT

Hello,

I try to write a function for a very small bootloader. Which should send commands to a display.

However the last statement "LPSPI0->TDR = (uint32_t)(0x20<<8);" cause a hard fault and I dont know why. Can anyone help me? The MCU is a K32L2A31A.

__attribute__ ((naked, section(".after_vectors.reset"))) void showBLMInfo(void){ //Connect CMP1 with TPM2 TRGMUX_TPM2 = TRGMUX_TRGCFG_SEL0(0b100111); //Comparator for regulated Chargepump PCC_CMP1 = PCC_CLKCFG_CGC_MASK; //Clock enable //Caution Vin2 as reference is VDD, datasheet is wrong here! CMP1->DACCR = CMP_DACCR_DACEN_MASK | CMP_DACCR_VRSEL_MASK | CMP_DACCR_VOSEL(0x2E); CMP1->MUXCR = CMP_MUXCR_MSEL(7) | CMP_MUXCR_PSEL(0); CMP1->CR1 = CMP_CR1_EN_MASK; //Generate PWM for Chargepump PCC_TPM2 = PCC_CLKCFG_CGC_MASK | PCC_CLKCFG_PCS(2); //Clock enable, Fast IRC TPM2->CONF = TPM_CONF_CPOT_MASK | TPM_CONF_TRGSEL(0) | TPM_CONF_DBGMODE_MASK; TPM2->CNT = 0; TPM2->MOD = 10; TPM2->CONTROLS[1].CnSC = TPM_CnSC_ELSB_MASK | TPM_CnSC_MSB_MASK; TPM2->CONTROLS[1].CnV = 5; //Enable Chargepump TPM2->SC = TPM_SC_CMOD(1) | TPM_SC_PS(2); //GPIO //GPIO_SPI0_CS_DISP_GPIO->PCOR = GPIO_SPI0_CS_DISP_GPIO_PIN_MASK; //EN_U_BAT, EN_DISP PCC_PORTE = PCC_CLKCFG_CGC_MASK; //Clock enable PORT E PCC_PORTD = PCC_CLKCFG_CGC_MASK; //Clock enable PORT D PORTE->PCR[1] = PORT_PCR_MUX(1); //EN_U_BAT PORTE->PCR[25] = PORT_PCR_MUX(2); //EN_DISP PORTD->PCR[0] = PORT_PCR_MUX(2); //CS PORTD->PCR[1] = PORT_PCR_MUX(2); //SCK PORTD->PCR[2] = PORT_PCR_MUX(2); //MOSI GPIOE->PDDR = (1U << 25U) | (1U << 1U); GPIOE->PSOR = (1U << 25U) | (1U << 1U); //1Hz Refresh Clock //RTC->CR |= RTC_CR_CPE(1); PCC_LPSPI0 = PCC_CLKCFG_CGC_MASK | PCC_CLKCFG_PCS(2); //Clock enable LPSPI0->CR = LPSPI_CR_DBGEN_MASK | LPSPI_CR_MEN_MASK; LPSPI0->CFGR1 = LPSPI_CFGR1_MASTER_MASK | LPSPI_CFGR1_PCSPOL(1) | LPSPI_CFGR1_AUTOPCS_MASK; LPSPI0->CCR = LPSPI_CCR_PCSSCK(11)|LPSPI_CCR_SCKPCS(2)|LPSPI_CCR_DBT(4); //Send Display clear command LPSPI0->TCR = LPSPI_TCR_FRAMESZ(15) | LPSPI_TCR_PRESCALE(4) | LPSPI_TCR_TXMSK_MASK | LPSPI_TCR_CONT_MASK; //16bit Transfer LPSPI0->TDR = (uint32_t)(0x20<<8); }

Thanks a lot in advance.

Re: Hard fault writing LPSPI0->TDR

nobodyKnows — Fri, 28 Apr 2023 06:48:51 GMT

Hello,

I found out the issue is not writing to "LPSPI0->TDR". The issue is the return of the function. Why a return from a function cause a hard fault in startup code? The call stack looks good before the hardfault cause.

I hope someone knows what is going on here.

Thanks a lot and best regards

Re: Hard fault writing LPSPI0->TDR

bobpaddock — Wed, 03 May 2023 13:20:58 GMT

Unless the function is an interrupt it should not be declared as naked.

Re: Hard fault writing LPSPI0->TDR

nobodyKnows — Fri, 05 May 2023 09:35:19 GMT

Hello,

thanks a lot this was the solution. Just leave naked

Best regards

topic Re: Hard fault writing LPSPI0->TDR in K32 L Series Microcontrollers

Hard fault writing LPSPI0->TDR

Re: Hard fault writing LPSPI0->TDR

Re: Hard fault writing LPSPI0->TDR

Re: Hard fault writing LPSPI0->TDR