jim herd / FPGA_bus

Comms between MAX 10 FPGA and ST uP

FPGA_bus.h@0:9600ed6fd725, 2019-02-20 (annotated)

Committer:
jimherd
Date:
Wed Feb 20 16:42:55 2019 +0000
Revision:
0:9600ed6fd725
Child:
1:b819a72b3b5d
Added PWM config function

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jimherd 0:9600ed6fd725 1 /*
jimherd 0:9600ed6fd725 2 * FPGA_bus : 8-bit bi-directional bus between uP and FPGA
jimherd 0:9600ed6fd725 3 *
jimherd 0:9600ed6fd725 4 * Author : Jim Herd
jimherd 0:9600ed6fd725 5 *
jimherd 0:9600ed6fd725 6 * Version 0.1 : initial release
jimherd 0:9600ed6fd725 7 */
jimherd 0:9600ed6fd725 8 #include "mbed.h"
jimherd 0:9600ed6fd725 9
jimherd 0:9600ed6fd725 10 #ifndef FPGA_bus_H
jimherd 0:9600ed6fd725 11 #define FPGA_bus_H
jimherd 0:9600ed6fd725 12
jimherd 0:9600ed6fd725 13 //
jimherd 0:9600ed6fd725 14 // Pin definitions
jimherd 0:9600ed6fd725 15
jimherd 0:9600ed6fd725 16 #define ASYNC_UP_RW_PIN PB_0
jimherd 0:9600ed6fd725 17 #define ASYNC_UP_HANDSHAKE_1_PIN PB_1
jimherd 0:9600ed6fd725 18 #define ASYNC_UP_HANDSHAKE_2_PIN PB_2
jimherd 0:9600ed6fd725 19 #define ASYNC_UP_START_PIN PB_3
jimherd 0:9600ed6fd725 20 #define ASYNC_UP_ACK_PIN PB_4
jimherd 0:9600ed6fd725 21 #define ASYNC_UP_RESET_PIN PB_5
jimherd 0:9600ed6fd725 22
jimherd 0:9600ed6fd725 23 //
jimherd 0:9600ed6fd725 24 //
jimherd 0:9600ed6fd725 25 #define PWM_BASE 1
jimherd 0:9600ed6fd725 26 #define NOS_PWM_REGISTERS 4
jimherd 0:9600ed6fd725 27 #define NOS_PWM_CHANNELS 4
jimherd 0:9600ed6fd725 28
jimherd 0:9600ed6fd725 29 #define QE_BASE ((NOS_PWM_REGISTERS * NOS_PWM_CHANNELS) + PWM_BASE)
jimherd 0:9600ed6fd725 30 #define NOS_QE_REGISTERS 7
jimherd 0:9600ed6fd725 31 #define NOS_QE_CHANNELS 4
jimherd 0:9600ed6fd725 32
jimherd 0:9600ed6fd725 33 #define RC_BASE ((NOS_QE_REGISTERS * NOS_QE_CHANNELS) + QE_BASE)
jimherd 0:9600ed6fd725 34 #define NOS_RC_CHANNELS 8
jimherd 0:9600ed6fd725 35
jimherd 0:9600ed6fd725 36 #define PWM_ch0 (PWM_BASE + (0 * NOS_PWM_REGISTERS))
jimherd 0:9600ed6fd725 37 #define PWM_ch1 (PWM_BASE + (1 * NOS_PWM_REGISTERS))
jimherd 0:9600ed6fd725 38 #define PWM_ch3 (PWM_BASE + (3 * NOS_PWM_REGISTERS))
jimherd 0:9600ed6fd725 39
jimherd 0:9600ed6fd725 40 #define RC_0 RC_BASE
jimherd 0:9600ed6fd725 41
jimherd 0:9600ed6fd725 42 #define NOS_RECEIVED_PACKET_WORDS 2
jimherd 0:9600ed6fd725 43
jimherd 0:9600ed6fd725 44 #define SET_BUS_INPUT (GPIOC->MODER = (GPIOC->MODER & 0xFFFF0000))
jimherd 0:9600ed6fd725 45 #define SET_BUS_OUTPUT (GPIOC->MODER = ((GPIOC->MODER & 0xFFFF0000) | 0x00005555))
jimherd 0:9600ed6fd725 46 #define OUTPUT_BYTE_TO_BUS(value) (GPIOC->ODR = ((GPIOC->ODR & 0x0000FF00) | (value & 0x000000FF)))
jimherd 0:9600ed6fd725 47 #define INPUT_BYTE_FROM_BUS (GPIOC->IDR & 0x000000FF)
jimherd 0:9600ed6fd725 48 #define ENABLE_GPIO_SUBSYSTEM (RCC->AHBENR |= RCC_AHBENR_GPIOCEN)
jimherd 0:9600ed6fd725 49
jimherd 0:9600ed6fd725 50 #define LOOP_HERE for(;;)
jimherd 0:9600ed6fd725 51
jimherd 0:9600ed6fd725 52 typedef struct {
jimherd 0:9600ed6fd725 53 uint8_t command;
jimherd 0:9600ed6fd725 54 uint8_t register_no;
jimherd 0:9600ed6fd725 55 uint32_t cmd_data;
jimherd 0:9600ed6fd725 56 uint32_t reply_data;
jimherd 0:9600ed6fd725 57 uint32_t reply_status;
jimherd 0:9600ed6fd725 58 } FPGA_packet_t;
jimherd 0:9600ed6fd725 59
jimherd 0:9600ed6fd725 60 typedef union {
jimherd 0:9600ed6fd725 61 uint32_t word_data[NOS_RECEIVED_PACKET_WORDS];
jimherd 0:9600ed6fd725 62 uint8_t byte_data[NOS_RECEIVED_PACKET_WORDS << 2];
jimherd 0:9600ed6fd725 63 } received_packet_t;
jimherd 0:9600ed6fd725 64
jimherd 0:9600ed6fd725 65 enum {READ_REGISTER_CMD=0, WRITE_REGISTER_CMD=1};
jimherd 0:9600ed6fd725 66 enum {READ_BUS=0, WRITE_BUS=1};
jimherd 0:9600ed6fd725 67 enum {LOW=0, HIGH=1};
jimherd 0:9600ed6fd725 68 enum {PWM_PERIOD=0, PWM_ON_TIME=1, PWM_CONFIG=2, PWM_STATUS=3};
jimherd 0:9600ed6fd725 69
jimherd 0:9600ed6fd725 70 enum {RC_SERVO_PERIOD=0, RC_SERVO_CONFIG=1, RC_SERVO_STATUS=2, RC_SERVO_ON_TIME=3};
jimherd 0:9600ed6fd725 71
jimherd 0:9600ed6fd725 72 enum {PWM_OFF=0x0, PWM_ON=0x1};
jimherd 0:9600ed6fd725 73 enum {INT_H_BRIDGE_OFF=0x0, INT_H_BRIDGE_ON=0x10000};
jimherd 0:9600ed6fd725 74 enum {EXT_H_BRIDGE_OFF=0x0, EXT_H_BRIDGE_ON=0x20000};
jimherd 0:9600ed6fd725 75 enum {MOTOR_COAST=0x0, MOTOR_FORWARD=0x40000, MOTOR_BACKWARD=0x80000, MOTOR_BRAKE=0xC0000};
jimherd 0:9600ed6fd725 76 enum {MODE_PWM_CONTROL=0x0, MODE_DIR_CONTROL=0x200000};
jimherd 0:9600ed6fd725 77 enum {NO_SWAP=0x0, YES_SWAP=0x800000};
jimherd 0:9600ed6fd725 78 enum {PWM_BRAKE_DWELL=0x0, PWM_COAST_DWELL=0x1000000};
jimherd 0:9600ed6fd725 79 enum {NO_INVERT = 0x0, H_BRIDGE_1_INVERT=0x2000000, H_BRIDGE_2_INVERT=0x4000000, ALL_INVERT=0x6000000};
jimherd 0:9600ed6fd725 80 enum {BACKWARD, FORWARD};
jimherd 0:9600ed6fd725 81
jimherd 0:9600ed6fd725 82 //DigitalOut async_uP_start(ASYNC_UP_START_PIN, LOW);
jimherd 0:9600ed6fd725 83 //DigitalOut async_uP_handshake_1(ASYNC_UP_HANDSHAKE_1_PIN, LOW);
jimherd 0:9600ed6fd725 84 //DigitalOut async_uP_RW(ASYNC_UP_RW_PIN, LOW);
jimherd 0:9600ed6fd725 85 //DigitalOut async_uP_reset(ASYNC_UP_RESET_PIN, HIGH);
jimherd 0:9600ed6fd725 86 //DigitalIn uP_ack(ASYNC_UP_ACK_PIN, PullDown);
jimherd 0:9600ed6fd725 87 //DigitalIn uP_handshake_2(ASYNC_UP_HANDSHAKE_2_PIN);
jimherd 0:9600ed6fd725 88
jimherd 0:9600ed6fd725 89 class FPGA_bus {
jimherd 0:9600ed6fd725 90 public:
jimherd 0:9600ed6fd725 91 FPGA_bus(int nos_PWM, int nos_QE, int nos_servo); // constructor
jimherd 0:9600ed6fd725 92 FPGA_bus(); // constructor
jimherd 0:9600ed6fd725 93
jimherd 0:9600ed6fd725 94 void initialise(void);
jimherd 0:9600ed6fd725 95 uint32_t do_command(FPGA_packet_t cmd_packet);
jimherd 0:9600ed6fd725 96 uint32_t set_PWM_period(uint32_t channel, float frequency);
jimherd 0:9600ed6fd725 97 uint32_t set_PWM_duty(uint32_t channel, float percentage);
jimherd 0:9600ed6fd725 98 uint32_t PWM_enable(uint32_t channel);
jimherd 0:9600ed6fd725 99 uint32_t PWM_config(uint32_t channel, uint32_t config_value);
jimherd 0:9600ed6fd725 100
jimherd 0:9600ed6fd725 101 protected:
jimherd 0:9600ed6fd725 102 uint32_t _nos_PWM_units;
jimherd 0:9600ed6fd725 103 uint32_t _nos_QE_units;
jimherd 0:9600ed6fd725 104 uint32_t _nos_servo_units;
jimherd 0:9600ed6fd725 105
jimherd 0:9600ed6fd725 106 private:
jimherd 0:9600ed6fd725 107 uint32_t data, status, tmp_config;
jimherd 0:9600ed6fd725 108 received_packet_t in_pkt;
jimherd 0:9600ed6fd725 109
jimherd 0:9600ed6fd725 110 void do_start(void);
jimherd 0:9600ed6fd725 111 void do_end(void);
jimherd 0:9600ed6fd725 112 void write_byte(uint32_t byte_value);
jimherd 0:9600ed6fd725 113 uint32_t read_byte(void);
jimherd 0:9600ed6fd725 114 void do_write( uint32_t command,
jimherd 0:9600ed6fd725 115 uint32_t register_address,
jimherd 0:9600ed6fd725 116 uint32_t register_data);
jimherd 0:9600ed6fd725 117 void do_read(received_packet_t *buffer);
jimherd 0:9600ed6fd725 118 void do_transaction(uint32_t command,
jimherd 0:9600ed6fd725 119 uint32_t register_address,
jimherd 0:9600ed6fd725 120 uint32_t register_data,
jimherd 0:9600ed6fd725 121 uint32_t *data,
jimherd 0:9600ed6fd725 122 uint32_t *status);
jimherd 0:9600ed6fd725 123
jimherd 0:9600ed6fd725 124 DigitalOut async_uP_start;
jimherd 0:9600ed6fd725 125 DigitalOut async_uP_handshake_1;
jimherd 0:9600ed6fd725 126 DigitalOut async_uP_RW;
jimherd 0:9600ed6fd725 127 DigitalOut async_uP_reset;
jimherd 0:9600ed6fd725 128 DigitalIn uP_ack;
jimherd 0:9600ed6fd725 129 DigitalIn uP_handshake_2;
jimherd 0:9600ed6fd725 130
jimherd 0:9600ed6fd725 131 struct SYS_data {
jimherd 0:9600ed6fd725 132 uint32_t PWM_period_value[NOS_PWM_CHANNELS];
jimherd 0:9600ed6fd725 133 uint32_t PWM_duty_value[NOS_PWM_CHANNELS];
jimherd 0:9600ed6fd725 134 } sys_data;
jimherd 0:9600ed6fd725 135 };
jimherd 0:9600ed6fd725 136
jimherd 0:9600ed6fd725 137 #endif
jimherd 0:9600ed6fd725 138