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sdk:examples:spi_master: add quad fast read 

Signed-off-by: liangkangnan <liangkangnan@163.com>
pull/4/head
liangkangnan 2021-09-23 09:45:48 +08:00
parent 75de08cfc8
commit 22e6866dea
3 changed files with 15 additions and 16 deletions
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12
sdk/examples/spi_master/flash_n25q.c
View File

@ -28,7 +28,7 @@ void flash_n25q_init(uint16_t clk_div)
}
// 写使能
// 擦除或者编程操作之前必须先发送写使能命令
// 擦除或者编程或者写寄存器之前必须先发送写使能命令
void flash_n25q_write_enable(uint8_t en)
{
uint8_t cmd;
@ -215,18 +215,22 @@ void flash_n25q_set_dummy_clock_cycles(uint8_t num)
{
uint8_t data;
flash_n25q_write_enable(1);
data = flash_n25q_read_reg(CMD_READ_VOL_CONF_REG);
data &= ~(0xf << 4);
data |= num << 4;
flash_n25q_write_reg(CMD_WRITE_VOL_CONF_REG, data);
flash_n25q_write_enable(0);
}
void flash_n25q_quad_fast_read(uint32_t addr, uint8_t data[], uint32_t len)
void flash_n25q_quad_output_fast_read(uint32_t addr, uint8_t data[], uint32_t len)
{
uint8_t tran_addr[3];
uint8_t cmd, i;
cmd = CMD_4_4_4_FAST_READ;
cmd = CMD_QUAD_OUTPUT_FAST_READ;
tran_addr[0] = (addr >> 16) & 0xff;
tran_addr[1] = (addr >> 8) & 0xff;
@ -235,7 +239,7 @@ void flash_n25q_quad_fast_read(uint32_t addr, uint8_t data[], uint32_t len)
spi0_set_ss_level(0);
spi0_master_write_bytes(&cmd, 1);
spi0_master_write_bytes(tran_addr, 3);
for (i = 0; i < DUMMY_CNT_4_4_4; i++)
for (i = 0; i < (DUMMY_CNT >> 1); i++)
spi0_master_read_bytes(data, 1);
spi0_reset_rxfifo();
spi0_master_read_bytes(data, len);

4
sdk/examples/spi_master/flash_n25q.h
View File

@ -33,7 +33,7 @@
#define CMD_READ_NONVOL_CONF_REG (0xB5)
#define DUMMY_CNT_4_4_4 (0x7)
#define DUMMY_CNT (0xa)
typedef struct {
@ -58,7 +58,7 @@ uint8_t flash_n25q_read_enhanced_volatile_conf_reg();
void flash_n25q_write_enhanced_volatile_conf_reg(uint8_t data);
void flash_n25q_enable_quad_mode(uint8_t en);
void flash_n25q_set_dummy_clock_cycles(uint8_t num);
void flash_n25q_quad_fast_read(uint32_t addr, uint8_t data[], uint32_t len);
void flash_n25q_quad_output_fast_read(uint32_t addr, uint8_t data[], uint32_t len);
uint8_t flash_n25q_read_nonvolatile_conf_reg();
#endif

15
sdk/examples/spi_master/main.c
View File

@ -61,6 +61,8 @@ int main()
for (i = 0; i < BUFFER_SIZE; i++)
xprintf("0x%x\n", read_data[i]);
flash_n25q_set_dummy_clock_cycles(DUMMY_CNT);
// 使能N25Q QSPI模式
flash_n25q_enable_quad_mode(1);
// 使能SPI控制器QSPI模式
@ -70,19 +72,12 @@ int main()
xprintf("manf id = 0x%2x\n", id.manf_id);
xprintf("mem type = 0x%2x\n", id.mem_type);
xprintf("mem cap = 0x%2x\n", id.mem_cap);
// 失能N25Q QSPI模式
flash_n25q_enable_quad_mode(0);
/*
flash_n25q_set_dummy_clock_cycles(DUMMY_CNT_4_4_4 << 1);
flash_n25q_enable_quad_mode(1);
spi0_set_spi_mode(SPI_MODE_QUAD);
flash_n25q_quad_fast_read(N25Q_PAGE_TO_ADDR(1), read_data, BUFFER_SIZE);
flash_n25q_quad_output_fast_read(N25Q_PAGE_TO_ADDR(1), read_data, BUFFER_SIZE);
xprintf("fast read data: \n");
for (i = 0; i < BUFFER_SIZE; i++)
xprintf("0x%x\n", read_data[i]);
// 失能N25Q QSPI模式
flash_n25q_enable_quad_mode(0);
*/
while (1);
}