R7FA4M2AD Issue with DTC and SCI9 – Master TrustZone Filter Error

Question

Hello All,

I'm new to Renesas and currently working on configuring SCI9 as a UART to transmit and receive data.

Transmission and reception work fine, but I'm encountering issues when I try to use the DTC.

Specifically, I'm getting a Master TrustZone Filter Error, even though I am not intentionally using TrustZone.
When I check SAU.SFAR, I see the address 0x40118903, which points to &PBP_SCI->TDR.

Do I need to disable something if I'm not using TrustZone in my application?

My code:

typedef struct
{
 uint8_t MRA; 
 uint8_t MRB; 
 uint8_t RESERVED[2];
 uint32_t SAR;
 uint32_t DAR;
 uint16_t CRA;
 uint16_t CRB;
} dtc_transfer_information;
#define PBP_SCI R_SCI9
#define PBP_TIM R_GPT320
#define PBP_TIM_IRQn IEL0_IRQn
#define PBP_TIM_IRQHandler GPT0_COMPARE_C_IRQHandler
#define PBP_DMA_TX R_DTC
#define PBP_DMA_TX_IRQn IEL2_IRQn
#define PBP_USART_IRQn IEL1_IRQn
#define PBP_USART_IRQHandler SCI9_RXI_IRQHandler
#define PBP_TIMEOUT_μs 10000-1
static LPBP_Frame_t PBP_Frame; //!< Strukuta odbieranej ramki
static uint8_t PBP_Out_Buffer[1536]; //!< Bufor danych wyjściowych
dtc_transfer_information DTC_VECTOR[DTC_VECTOR_SIZE] __attribute__((aligned(1024)));
void PBP_Init(void)
{
 DTC_VECTOR[PBP_DMA_TX_IRQn].MRA = 0
 | DTC_MRA_SM_INC
 | DTC_MRA_SZ_8bit
 | DTC_MRA_MD_NORMAL;
 DTC_VECTOR[PBP_DMA_TX_IRQn].MRB = 0
 | DTC_MRB_DM_FIXED;
 DTC_VECTOR[PBP_DMA_TX_IRQn].SAR = (uint32_t)&PBP_Out_Buffer[1];
 DTC_VECTOR[PBP_DMA_TX_IRQn].DAR = (uint32_t)&PBP_SCI->TDR;
 R_DTC->DTCVBR = (uint32_t) DTC_VECTOR;
 PBP_TIM->GTCR = GPT_GTCR_MD_MODE_PWM | GPT_GTCR_TPCS_PCLKD_DIV32;
 PBP_TIM->GTPR = 0xFFFFFFFF;
 PBP_TIM->GTCCRC = PBP_TIMEOUT_μs;
 PBP_TIM->GTCNT = 0x00000000;
 PBP_TIM->GTST = 0;
 NVIC_ClearPendingIRQ(PBP_TIM_IRQn);
 NVIC_EnableIRQ(PBP_TIM_IRQn);
 PBP_SCI->SMR = SCI_SMR_CKS_PCLK_DIV4; //CLK = 8Mhz
 PBP_SCI->SPTR = 0
 | SCI0_SPTR_SPB2DT_Msk
 | SCI0_SPTR_SPB2IO_Msk;
// PBP_SCI->BRR = (uint8_t)((CLK_PCLKA / (32 * 9600U)) - 1);
 PBP_SCI->BRR = 1;
 PBP_SCI->SEMR = SCI0_SEMR_BRME_Msk; //Enable MDDR
 PBP_SCI->MDDR = 236;
 PBP_SCI->SCR = 0
 | SCI0_SCR_RE_Msk
 | SCI0_SCR_TE_Msk
 | SCI0_SCR_TIE_Msk
 | SCI0_SCR_RIE_Msk;
 NVIC_ClearPendingIRQ(PBP_DMA_TX_IRQn);
 NVIC_EnableIRQ(PBP_DMA_TX_IRQn);
 R_ICU->IELSR2 = ICU_IELSRn_DTCE_EN | ICU_IELSRn_IELS(0x1B7); //ELC_EVENT_SCI9_TXI
 NVIC_ClearPendingIRQ(PBP_USART_IRQn);
 NVIC_EnableIRQ(PBP_USART_IRQn);
}
void send_USART_DMA(uint16_t size)
{
// for(uint16_t idx=0; idx<size; idx++)
// {
// PBP_SCI->TDR = PBP_Out_Buffer[idx];
// while((PBP_SCI->SSR & SCI0_SSR_TDRE_Msk) == 0);
// }
 R_DTC->DTCST = 0;
 DTC_VECTOR[PBP_DMA_TX_IRQn].CRA = size-1;
 R_DTC->DTCST = DTC_DTCST_DTCST_Msk;
 PBP_SCI->TDR = PBP_Out_Buffer[0];
 while(DTC_VECTOR[PBP_DMA_TX_IRQn].CRA);
 R_DTC->DTCST = 0;
 while((PBP_SCI->SSR & SCI0_SSR_TDRE_Msk) == 0);
}
Any help would be appreciated.
Best regards,
Baterflu

AZ [Renesas] · Answer

Hello, 
 From chapter 17.4.11 of the hardware manual: 
 DTC has the Master TrustZone Filter. The Master TrustZone Filter in DTC can detect the security areas of Flash area(code Flash and data Flash) and SRAM area(ECC / Parity RAM) defined by IDAU. When no-secure accesses those addresses, it detects the security violation. Access of violation address is not performed. Detected the error is handled as the Master TrustZone Filter error. 
 It could be because the Trustzone boundaries have not been programmed correctly. 
 Are you working on a custom board or evaluation kit ? If the P201/MD pin is not wired with P300/SWCLK then e2studio cannot put the device into boot mode in order to program the Trustzone boundaries on the device.