Other Parts Discussed in Thread: MSP430FR5994,
I seem to be struggling to get my CC1120 EVM talking with my MSP430FR5994. As of now, this is a barebones project, where the focus is simply to get the radio working, with the existing swrc253e example code.
Setup:
Board: MSPFR5994 Launchpad
Booster pack: EM Adapter
RF Module: CC1120EM(915Mhz)
Software Pack: swrc253e
According to the Booster/Launchpad docs, my pinout should look like this:
Launchpad Signal CC1120_RF_EM VDD VDD 2:7/9 P1.2 GPIOB(2) 1:12 P6:1 GPIO(TX) 1:9 P6:0 GPIO(RX) 1:7 P5:2 SPI CLK 1:16 P7:0 GPIO5 2:19 GND GND P2:2/20 P1:1/19 P5:7 GPIOA(0) 1:10 P4:4 SPI CS 1:14 P5:0 SPI MOSI 1:18 P5:1 SPI MISO 1:20 P8:3 RESET 2:15 P8:2 GPIO4 1:3 P8:1 GPIO3 2:18
Base on this, I created the following definitions
#define RF_PORT_SEL1 P5SEL1 #define RF_PORT_SEL0 P5SEL0 #define RF_PORT_OUT P5OUT #define RF_PORT_DIR P5DIR #define RF_PORT_IN P5IN #define RF_MOSI_PIN BIT0 #define RF_MISO_PIN BIT1 #define RF_SCLK_PIN BIT2 #define RF_CS_N_PORT_SEL P4SEL1 #define RF_CS_N_PORT_DIR P4DIR #define RF_CS_N_PORT_OUT P4OUT #define RF_CS_N_PIN BIT4
The problem is, I cannot get MISO to go low on the CC1120. I have attached a screenshot below, as well as the code that was ran at the time of the capture.
Below is the relevant code. I move things into main to make this post easier to read. Ultimately what happens is that trxSpiCmdStrobe() hangs at while(RF_PORT_IN & RF_MISO_PIN). I have tried inserting delays to see if maybe it was a timing issue, but no luck.
void main(void) {
// Disable the GPIO power-on default high-impedance mode to activate
// previously configured port settings
PM5CTL0 &= ~LOCKLPM5;
PJSEL0 |= BIT4 | BIT5; // For XT1
// XT1 Setup
CSCTL0_H = CSKEY_H; // Unlock CS registers
CSCTL1 = DCOFSEL_0; // Set DCO to 1MHz
CSCTL2 = SELA__LFXTCLK | SELS__DCOCLK | SELM__DCOCLK;
CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1; // set all dividers
CSCTL4 &= ~LFXTOFF;
do {
CSCTL5 &= ~LFXTOFFG; // Clear XT1 fault flag
SFRIFG1 &= ~OFIFG;
}
while (SFRIFG1 & OFIFG); // Test oscillator fault flag
CSCTL0_H = 0; // Lock CS registers
// Put state machine in reset
UCB1CTLW0 = UCSWRST;
// 3-pin, 8-bit SPI master Clock polarity high, MSB
UCB1CTLW0 |= UCMST | UCSYNC | UCMODE_0 | UCMSB | UCCKPH;
// ACLK
UCB1CTLW0 |= UCSSEL__ACLK;
UCB1BR1 = 0x00;
// Prescaler
UCB1BR0 = 0x02;
// Chip select
RF_CS_N_PORT_SEL &= ~RF_CS_N_PIN;
RF_CS_N_PORT_DIR |= RF_CS_N_PIN;
RF_CS_N_PORT_OUT |= RF_CS_N_PIN;
// Configure GPIO MISO MOSI CLK
RF_PORT_SEL1 &= ~(RF_MOSI_PIN | RF_MISO_PIN | RF_SCLK_PIN);
RF_PORT_SEL0 |= (RF_MOSI_PIN | RF_MISO_PIN | RF_SCLK_PIN);
UCB1CTLW0 &= ~UCSWRST;
trxSpiCmdStrobe(CC112X_SRES);
return;
}
rfStatus_t trxSpiCmdStrobe(uint8_t cmd) {
uint8_t rc;
TRXEM_SPI_BEGIN(); // <- I verified CS goes low
while(RF_PORT_IN & RF_MISO_PIN); // <-- But MISO stays high at all times and does not get past this loop
TRXEM_SPI_TX(cmd);
TRXEM_SPI_WAIT_DONE();
rc = TRXEM_SPI_RX();
TRXEM_SPI_END();
return(rc);
}
In terms of the CC1120, are there any additional tests I can run to verify the chip is active? I probed the booster pack to ensure it was getting power, and hooked the logic analyzer to the corresponding breakouts.
