diff options
Diffstat (limited to 'drivers/sensors/pmw3360.c')
| -rw-r--r-- | drivers/sensors/pmw3360.c | 276 |
1 files changed, 142 insertions, 134 deletions
diff --git a/drivers/sensors/pmw3360.c b/drivers/sensors/pmw3360.c index 50d1c35801..9e3aeaa468 100644 --- a/drivers/sensors/pmw3360.c +++ b/drivers/sensors/pmw3360.c @@ -16,6 +16,7 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include "spi_master.h" #include "pmw3360.h" #include "wait.h" #include "debug.h" @@ -24,59 +25,65 @@ // Registers // clang-format off -#define REG_Product_ID 0x00 -#define REG_Revision_ID 0x01 -#define REG_Motion 0x02 -#define REG_Delta_X_L 0x03 -#define REG_Delta_X_H 0x04 -#define REG_Delta_Y_L 0x05 -#define REG_Delta_Y_H 0x06 -#define REG_SQUAL 0x07 -#define REG_Raw_Data_Sum 0x08 -#define REG_Maximum_Raw_data 0x09 -#define REG_Minimum_Raw_data 0x0A -#define REG_Shutter_Lower 0x0B -#define REG_Shutter_Upper 0x0C -#define REG_Control 0x0D -#define REG_Config1 0x0F -#define REG_Config2 0x10 -#define REG_Angle_Tune 0x11 -#define REG_Frame_Capture 0x12 -#define REG_SROM_Enable 0x13 -#define REG_Run_Downshift 0x14 -#define REG_Rest1_Rate_Lower 0x15 -#define REG_Rest1_Rate_Upper 0x16 -#define REG_Rest1_Downshift 0x17 -#define REG_Rest2_Rate_Lower 0x18 -#define REG_Rest2_Rate_Upper 0x19 -#define REG_Rest2_Downshift 0x1A -#define REG_Rest3_Rate_Lower 0x1B -#define REG_Rest3_Rate_Upper 0x1C -#define REG_Observation 0x24 -#define REG_Data_Out_Lower 0x25 -#define REG_Data_Out_Upper 0x26 -#define REG_Raw_Data_Dump 0x29 -#define REG_SROM_ID 0x2A -#define REG_Min_SQ_Run 0x2B -#define REG_Raw_Data_Threshold 0x2C -#define REG_Config5 0x2F -#define REG_Power_Up_Reset 0x3A -#define REG_Shutdown 0x3B -#define REG_Inverse_Product_ID 0x3F -#define REG_LiftCutoff_Tune3 0x41 -#define REG_Angle_Snap 0x42 -#define REG_LiftCutoff_Tune1 0x4A -#define REG_Motion_Burst 0x50 -#define REG_LiftCutoff_Tune_Timeout 0x58 -#define REG_LiftCutoff_Tune_Min_Length 0x5A -#define REG_SROM_Load_Burst 0x62 -#define REG_Lift_Config 0x63 -#define REG_Raw_Data_Burst 0x64 -#define REG_LiftCutoff_Tune2 0x65 +#define REG_Product_ID 0x00 +#define REG_Revision_ID 0x01 +#define REG_Motion 0x02 +#define REG_Delta_X_L 0x03 +#define REG_Delta_X_H 0x04 +#define REG_Delta_Y_L 0x05 +#define REG_Delta_Y_H 0x06 +#define REG_SQUAL 0x07 +#define REG_Raw_Data_Sum 0x08 +#define REG_Maximum_Raw_data 0x09 +#define REG_Minimum_Raw_data 0x0a +#define REG_Shutter_Lower 0x0b +#define REG_Shutter_Upper 0x0c +#define REG_Control 0x0d +#define REG_Config1 0x0f +#define REG_Config2 0x10 +#define REG_Angle_Tune 0x11 +#define REG_Frame_Capture 0x12 +#define REG_SROM_Enable 0x13 +#define REG_Run_Downshift 0x14 +#define REG_Rest1_Rate_Lower 0x15 +#define REG_Rest1_Rate_Upper 0x16 +#define REG_Rest1_Downshift 0x17 +#define REG_Rest2_Rate_Lower 0x18 +#define REG_Rest2_Rate_Upper 0x19 +#define REG_Rest2_Downshift 0x1a +#define REG_Rest3_Rate_Lower 0x1b +#define REG_Rest3_Rate_Upper 0x1c +#define REG_Observation 0x24 +#define REG_Data_Out_Lower 0x25 +#define REG_Data_Out_Upper 0x26 +#define REG_Raw_Data_Dump 0x29 +#define REG_SROM_ID 0x2a +#define REG_Min_SQ_Run 0x2b +#define REG_Raw_Data_Threshold 0x2c +#define REG_Config5 0x2f +#define REG_Power_Up_Reset 0x3a +#define REG_Shutdown 0x3b +#define REG_Inverse_Product_ID 0x3f +#define REG_LiftCutoff_Tune3 0x41 +#define REG_Angle_Snap 0x42 +#define REG_LiftCutoff_Tune1 0x4a +#define REG_Motion_Burst 0x50 +#define REG_LiftCutoff_Tune_Timeout 0x58 +#define REG_LiftCutoff_Tune_Min_Length 0x5a +#define REG_SROM_Load_Burst 0x62 +#define REG_Lift_Config 0x63 +#define REG_Raw_Data_Burst 0x64 +#define REG_LiftCutoff_Tune2 0x65 + +#define CPI_STEP 100 // clang-format on +// limits to 0--119, resulting in a CPI range of 100 -- 12000 (as only steps of 100 are possible). +// Note that for the PMW3389DM chip, the step size is 50 and supported range is +// up to 16000. The datasheet does not indicate the minimum CPI though, neither +// whether this uses 2 bytes (as 16000/50 == 320) #ifndef MAX_CPI -# define MAX_CPI 0x77 // limits to 0--119, should be max cpi/100 +# define MAX_CPI 0x77 #endif bool _inBurst = false; @@ -86,66 +93,50 @@ void print_byte(uint8_t byte) { dprintf("%c%c%c%c%c%c%c%c|", (byte & 0x80 ? '1' #endif #define constrain(amt, low, high) ((amt) < (low) ? (low) : ((amt) > (high) ? (high) : (amt))) -bool spi_start_adv(void) { +bool pmw3360_spi_start(void) { bool status = spi_start(PMW3360_CS_PIN, PMW3360_SPI_LSBFIRST, PMW3360_SPI_MODE, PMW3360_SPI_DIVISOR); + // tNCS-SCLK, 120ns wait_us(1); return status; } -void spi_stop_adv(void) { - wait_us(1); - spi_stop(); -} +spi_status_t pmw3360_write(uint8_t reg_addr, uint8_t data) { + pmw3360_spi_start(); -spi_status_t spi_write_adv(uint8_t reg_addr, uint8_t data) { if (reg_addr != REG_Motion_Burst) { _inBurst = false; } - spi_start_adv(); // send address of the register, with MSBit = 1 to indicate it's a write spi_status_t status = spi_write(reg_addr | 0x80); status = spi_write(data); - // tSCLK-NCS for write operation - wait_us(20); - - // tSWW/tSWR (=120us) minus tSCLK-NCS. Could be shortened, but is looks like a safe lower bound - wait_us(100); + // tSCLK-NCS for write operation is 35us + wait_us(35); spi_stop(); + + // tSWW/tSWR (=180us) minus tSCLK-NCS. Could be shortened, but is looks like a safe lower bound + wait_us(145); return status; } -uint8_t spi_read_adv(uint8_t reg_addr) { - spi_start_adv(); +uint8_t pmw3360_read(uint8_t reg_addr) { + pmw3360_spi_start(); // send adress of the register, with MSBit = 0 to indicate it's a read spi_write(reg_addr & 0x7f); - + // tSRAD (=160us) + wait_us(160); uint8_t data = spi_read(); // tSCLK-NCS for read operation is 120ns wait_us(1); + spi_stop(); // tSRW/tSRR (=20us) minus tSCLK-NCS wait_us(19); - - spi_stop(); return data; } -void pmw3360_set_cpi(uint16_t cpi) { - uint8_t cpival = constrain((cpi / 100) - 1, 0, MAX_CPI); - - spi_start_adv(); - spi_write_adv(REG_Config1, cpival); - spi_stop(); -} - -uint16_t pmw3360_get_cpi(void) { - uint8_t cpival = spi_read_adv(REG_Config1); - return (uint16_t)((cpival + 1) & 0xFF) * 100; -} - bool pmw3360_init(void) { setPinOutput(PMW3360_CS_PIN); @@ -153,42 +144,51 @@ bool pmw3360_init(void) { _inBurst = false; spi_stop(); - spi_start_adv(); + pmw3360_spi_start(); spi_stop(); - spi_write_adv(REG_Shutdown, 0xb6); // Shutdown first + pmw3360_write(REG_Shutdown, 0xb6); // Shutdown first wait_ms(300); - spi_start_adv(); + pmw3360_spi_start(); wait_us(40); - spi_stop_adv(); + spi_stop(); wait_us(40); - spi_write_adv(REG_Power_Up_Reset, 0x5a); + // power up, need to first drive NCS high then low, see above. + pmw3360_write(REG_Power_Up_Reset, 0x5a); wait_ms(50); - spi_read_adv(REG_Motion); - spi_read_adv(REG_Delta_X_L); - spi_read_adv(REG_Delta_X_H); - spi_read_adv(REG_Delta_Y_L); - spi_read_adv(REG_Delta_Y_H); + // read registers and discard + pmw3360_read(REG_Motion); + pmw3360_read(REG_Delta_X_L); + pmw3360_read(REG_Delta_X_H); + pmw3360_read(REG_Delta_Y_L); + pmw3360_read(REG_Delta_Y_H); pmw3360_upload_firmware(); - spi_stop_adv(); + spi_stop(); wait_ms(10); pmw3360_set_cpi(PMW3360_CPI); wait_ms(1); - spi_write_adv(REG_Config2, 0x00); + pmw3360_write(REG_Config2, 0x00); - spi_write_adv(REG_Angle_Tune, constrain(ROTATIONAL_TRANSFORM_ANGLE, -30, 30)); + pmw3360_write(REG_Angle_Tune, constrain(ROTATIONAL_TRANSFORM_ANGLE, -127, 127)); - spi_write_adv(REG_Lift_Config, PMW3360_LIFTOFF_DISTANCE); + pmw3360_write(REG_Lift_Config, PMW3360_LIFTOFF_DISTANCE); bool init_success = pmw3360_check_signature(); +#ifdef CONSOLE_ENABLE + if (init_success) { + dprintf("pmw3360 signature verified"); + } else { + dprintf("pmw3360 signature verification failed!"); + } +#endif writePinLow(PMW3360_CS_PIN); @@ -196,13 +196,16 @@ bool pmw3360_init(void) { } void pmw3360_upload_firmware(void) { - spi_write_adv(REG_SROM_Enable, 0x1d); + // Datasheet claims we need to disable REST mode first, but during startup + // it's already disabled and we're not turning it on ... + //pmw3360_write(REG_Config2, 0x00); // disable REST mode + pmw3360_write(REG_SROM_Enable, 0x1d); wait_ms(10); - spi_write_adv(REG_SROM_Enable, 0x18); + pmw3360_write(REG_SROM_Enable, 0x18); - spi_start_adv(); + pmw3360_spi_start(); spi_write(REG_SROM_Load_Burst | 0x80); wait_us(15); @@ -214,68 +217,73 @@ void pmw3360_upload_firmware(void) { } wait_us(200); - spi_read_adv(REG_SROM_ID); - - spi_write_adv(REG_Config2, 0x00); - - spi_stop(); - wait_ms(10); + pmw3360_read(REG_SROM_ID); + pmw3360_write(REG_Config2, 0x00); } bool pmw3360_check_signature(void) { - uint8_t pid = spi_read_adv(REG_Product_ID); - uint8_t iv_pid = spi_read_adv(REG_Inverse_Product_ID); - uint8_t SROM_ver = spi_read_adv(REG_SROM_ID); + uint8_t pid = pmw3360_read(REG_Product_ID); + uint8_t iv_pid = pmw3360_read(REG_Inverse_Product_ID); + uint8_t SROM_ver = pmw3360_read(REG_SROM_ID); return (pid == firmware_signature[0] && iv_pid == firmware_signature[1] && SROM_ver == firmware_signature[2]); // signature for SROM 0x04 } +uint16_t pmw3360_get_cpi(void) { + uint8_t cpival = pmw3360_read(REG_Config1); + return (uint16_t)((cpival + 1) & 0xFF) * CPI_STEP; +} + +void pmw3360_set_cpi(uint16_t cpi) { + uint8_t cpival = constrain((cpi / CPI_STEP) - 1, 0, MAX_CPI); + pmw3360_write(REG_Config1, cpival); +} + report_pmw3360_t pmw3360_read_burst(void) { + report_pmw3360_t report = {0}; + if (!_inBurst) { #ifdef CONSOLE_ENABLE dprintf("burst on"); #endif - spi_write_adv(REG_Motion_Burst, 0x00); + pmw3360_write(REG_Motion_Burst, 0x00); _inBurst = true; } - spi_start_adv(); + pmw3360_spi_start(); spi_write(REG_Motion_Burst); - wait_us(35); // waits for tSRAD + wait_us(35); // waits for tSRAD_MOTBR - report_pmw3360_t data = {0}; + report.motion = spi_read(); + spi_read(); // skip Observation + // delta registers + report.dx = spi_read(); + report.mdx = spi_read(); + report.dy = spi_read(); + report.mdy = spi_read(); - data.motion = spi_read(); - spi_write(0x00); // skip Observation - data.dx = spi_read(); - data.mdx = spi_read(); - data.dy = spi_read(); - data.mdy = spi_read(); + if (report.motion & 0b111) { // panic recovery, sometimes burst mode works weird. + _inBurst = false; + } spi_stop(); #ifdef CONSOLE_ENABLE if (debug_mouse) { - print_byte(data.motion); - print_byte(data.dx); - print_byte(data.mdx); - print_byte(data.dy); - print_byte(data.mdy); + print_byte(report.motion); + print_byte(report.dx); + print_byte(report.mdx); + print_byte(report.dy); + print_byte(report.mdy); dprintf("\n"); } #endif - data.isMotion = (data.motion & 0x80) != 0; - data.isOnSurface = (data.motion & 0x08) == 0; - data.dx |= (data.mdx << 8); - data.dx = data.dx * -1; - data.dy |= (data.mdy << 8); - data.dy = data.dy * -1; - - spi_stop(); + report.isMotion = (report.motion & 0x80) != 0; + report.isOnSurface = (report.motion & 0x08) == 0; + report.dx |= (report.mdx << 8); + report.dx = report.dx * -1; + report.dy |= (report.mdy << 8); + report.dy = report.dy * -1; - if (data.motion & 0b111) { // panic recovery, sometimes burst mode works weird. - _inBurst = false; - } - - return data; + return report; } |